BE482801A - - Google Patents

Description

       

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  "Telephone system It.



   The present invention relates to long distance telephone systems and more particularly to the routing and establishment of interurban communications during periods of line occupation.



   In a long distance office, automatically switched inbound, there are long distance lines / going directly to other long distance offices at an automatically controlled mechanism operated by pulses to choose a 1-1, =; ne outgoing long distance connection for the purpose of establishing long distance communication to another town or long distance communication in the town in which the automatic switching long distance office is located.

   Of

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 Outgoing junctions connected to the outgoing trunk lines are provided in groups designated by the code of the office to which the trunk lines extend, and the code pulses transmitted on a calling line activate the automatic control mechanism of the office. Dour choose a free junction in one of these groups in particular. Other trunk lines arriving at the automatic switching trunk office are connected to a trunk operator which transmits pulses to the telephone.

    mechanism for choosing a free outgoing junction in order to connect it to the finish line.



   Number of; trunk lines from one inter-city office to another inter-city office, varies with the normal volume of the nature of. traffic between; offices, and therefore, during periods of occupancy, there are circumstances where the demand for lines to certain interurban offices is greater than the number of lines extending to those offices and / or the state. - establishment of communications with these offices is delayed.

   making such periods it is important to keep calling long distance operators in distant and near offices, who are trying to establish communications, aware of the status of these groups of trunk lines and to facilitate the establishment of these deferred communications to relieve these calling long distance operators of the obligation to make repeated unsuccessful attempts to ensure a free line for long distance communication;



   The object of this invention is therefore to provide centralized automatic control mechanisms, to facilitate the rapid establishment of long distance calls during periods when demand for

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   long distance communications lead to abnormal line occupancy.



   A particular feature of the invention consists in the centralization of the control of groups of occupied lines on a switch panel with manual operation and in automatic control mechanisms: to divert a calling trunk line to this switch panel with manual operation in response to the pulses which have been transmitted to obtain a line of a busy group of lines.



   Another related feature consists in making groups of trunk lines abnormally busy, unavailable for calling trunk lines and available only for equipment of said switch panel with manual operation.



   Another related feature consists of signaling mechanisms of said table: at the switch, specific to each group of lines in order to observe the character of the lines of said group and to see if a free line is available.



   Another related feature consists of the mechanisms of said switchboard for the rapid establishment of deferred long-distance calls.



   A further related feature consists in the use of special trunk circuits for the establishment of trunk calls via the automatic switching mechanism to two different trunk offices in order to realize a trunk link of a subscriber. calling to a called subscriber.



   The foregoing features and other features of the invention will be described more fully in this specification which should be considered in connection with the accompanying drawings and the accompanying claims.

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   With reference to the drawings: ï "1, j ;. 1 and are a schematic illustration of incoming trunk lines entering the automatic switching office" crossbau "or crossbar system and the directions imposed on these lines under various conditions. traffic in this office;
Fig. 3 and 4 illustrate the marker mechanism for directing calling inbound lines, the outbound junction testing mechanism to find a free junction, and an overflow junction control mechanism.



   Fig. 5 illustrates an overflow junction, overload circuit control relays, a hold utterance circuit, a branch cord between the hold utterance circuit and an overflow junction and a mechanism for determining if there is a free junction in a desired group of junctions.



   Fig. 6 illustrates a four-wire incoming junction from a key-operated long distance office.



   Fig. 7 illustrates the junctions to which the incoming junction, FIG. 6, would be directed automatically under different circumstances, an outgoing junction to a trunk line, Fig. 7B, to an overflow junction, Fig. 7C, to a main occupancy junction 7D or to a special four-wire junction, Fig. 7A, entering a manually operated switch panel to flow delayed communication andes, known as a call order switch panel.

   Fig. 7E schematically illustrates an originating call. from the call order switch board to a long distance furniture operator who has previously tried to establish a long distance call and has found all lines busy.

   This mechanism is explained in detail in

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 EMI5.1
 Figs. 2L ', 21 and 2 ..; 1 'ig ;. 8, 9, 10 and 11 illustrate the cord circuit c. jicllel 1G plugs :, 1- <: circuit t.:J.0,)li,)llique, a position circuit and keys 1 :: ¯: ü¯LS ¯OflC of array c <Jx; :: iuiiate1 = r of order of c, "- 'IC1S. L": 1,1 = ;. 12, 13 and 14 illustrate the direction of <1- before several possibilities of a call C¯ ', 1l'riv'8, or towards a special junction, liiy ;. 7A, v <. :: 's the call order table, either to a special operator without cor.lons, nar the intermediary of the special Junction ig. 13 when there is no operator occupying the tablc: to the order of apGls;

   
Fig. 14E schematically illustrates an incoming call which is directed, by an operator without cords to the call order switch board for information about a busy group of trunks;
Fig. 15 illustrates an alternating current generator device for providing pulse currents of different frequencies;
Fig. 16, 17, 18, and 19 show special four-wire junctions connected to the tracks of a cordless operator position and other circuits to route a delayed call request to the calling long distance operator and to the desired long distance line ;

     Fig. 20,21 and 22 illustrate an outgoing junction
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 signal from the command call panel connected by crossbar switches to an outgoing junction under the control. the operator of the call order table;
Fig. 23 to 35 illustrate a recorder-sender arranged to be regulated by pulses of direct or alternating current and arranged to transmit

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 pulses of direct or alternating current for
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 adjust other recorders;

   the end. 32 illustrates the AC pulse receiving circuitry for the recorder-sender, and iL '36 illustrates how the drawings are assembled to illustrate the invention.
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 i: ;; CF-ïPl'lCi, G>; 13ihiALE
Different kinds of trunk lines enter into a cross-bar or "cross-bar" trunk switch system.

   These trunk lines terminate in the cross-bar trunk office at incoming trunk junctions from other trunk offices, which junctions connect the incoming trunk lines, through 1-t inter- mediate couplings or loader devices.
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 either to registrants,

   or to a switched interurban switchboard for the establishment of interurban communications to the outside. Keyed pulse generator equipment or dials are used in some toll offices for setting the recorder-sender registers of the cross-bar toll office and other offices employ known manually operated trunk lines. under the name of "trunk lines with calling on circuits and direct calling on auxiliary lines and automatic monitoring" which are connected by means
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 do coupla'es to the non-corded trunk switchboard of the crossbar office.

   The aforementioned inbound trunk lines
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 J. pulse keys Or dial, when they are .l: i? S e21 service one (- int line operator <ce:.> i.ir- bainp remote, automatically choose a recorder (Lr-ellvoY2ur through a mechanism e: '; 011.;) 1 ::' .: '0 or finder device and read q, .iī

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 of the recorder-sender are set automatically - because the pulse equipment is operated by the operator of the calling long distance office. The sending logger is automatically linked to a marker and the code of the desired trunk line is transferred to the marker’s loggers.

   The marker registers function to actuate a particular trunk relay designating the group of trunks from which a free outgoing trunk trunk or a free establishment trunk is chosen. Day in the establishment of the inter-city call to the desired office. After selecting the free trunk, crossbar switches are activated by the marker and thus the outgoing trunk trunk is connected to the inbound trunk from the originating trunk office to establish this trunk call.



   The manual type of trunk line such as the aforementioned trunk line with call on circuits and direct call on auxiliary lines (Fig, 2, DTSR) and automatic listening has no equipment associated with it. pulse in the original long distance office. Excitation of the manual trunk line of this type activates a trunk line entering the crossbar office 'but instead of choosing a recorder-sender,

   this incoming long distance trunk is connected by means of a coupling mechanism to a long distance operator in the interurban cross-bar office - This long distance operator will be referred to here under the name of long distance operator without cords since no - no bend cords on this intercity switchboard. The long distance operator without cords, when answering a call, states the name of sa'ville and enters into conversation with the long distance operator of ori @ ine to be able to find

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 direction requested in order to establish long distance communication.

   This cordless operator has a keypad and a recorder-sender associated with its position and operates its keypad in response for the adjustment of the signal recorders of a recorder-sender according to the / code or interurban "code" from the office junction to the city given to it by the original long-distance operator. This long distance code is transferred to the recorders of a marker. The original or calling operator also gives the cordless operator the number of the calling office and subscriber for certain types of communications, which is also sent in pulses to the recorder-sender.

   The code or area code stored in the marker energizes a feeder relay designating the group of junctions from which a free junction must be chosen to establish long distance communication. As soon as the marker chooses a free trunk, cross-bar switches are energized to connect that outgoing trunk trunk to the inbound trunk trunk and the marker and recorder can be released for further service. In most cases, the operator without cables is also free since arrangements are available either for the original long distance operator or for the operator connected to her, in order to re-report to the wireless operator. cords that other services are requested.

   In order to easily distinguish between the two types of trunk links, the trunk line coming from a trunk switchboard provided with pulse equipment will be referred to here as the key pulse trunk line and the trunk line. trunk line from a trunk office that does not have key-operated equipment

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 will be referred to here as a manual trunk line.



   For reasons of economy, junctions and long distance lines between telephone offices are not provided so widely that a subscriber is always sure of finding an available long distance line to carry out his call request, since it is theoretically. It is only possible that a majority of subscribers may wish to request a call simultaneously.



  Such a possibility is ruled out and interurban junctions are provided on what is a practical basis for ensuring a satisfactory service for subscribers without violating the principle of economy. The number of junctions between toll offices may vary with the length of the line and the volume and nature of the traffic. Therefore, under unusual conditions for a period of time all trunk lines between some offices may be busy and therefore there is a waiting period to carry certain trunk calls.



   When long distance lines from one office to another are busy, it is desirable to keep the operator, who is trying to establish the long distance call, informed of their condition so that it is cleared. the need to make repeated unsuccessful calls to secure a long distance line to a distant office. It is also desirable to route delayed calls as quickly as possible in the order in which lines to distant points are requested by calling toll operators trying to obtain toll links for different subscribers.

   The main arrangements to satisfy this object in

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 in the interurban cross-bar system are overflow circuits associated with groups of interurban lines, main occupancy signals, switchboards in order to announce the waiting time for groups of interurban lines on when there is waiting and to buy delayed calls, and automatic switching devices to connect calling lines to signaling devices and to these switching panels.



   The cross-bar trunk system is provided with a switch panel which will be referred to herein as the call order switch panel to which key-pulse trunk lines are automatically routed when that the trunks of a group to which the call is directed are busy. The operators of the call order switch panel can inform the calling operator about the extent of the wait to be expected, can, under certain conditions, establish the telephone call if a free junction can be found by this operator, or can complete a form at the request of the calling operator and make the interurban connection as soon as a free connection is available.

   Manual calls which automatically reach the switch panel without cords are naturally passed, as far as possible, by the operator of the switch panel without cords. If a wait is encountered by the original operator by making an interurban connection, the original operator can ask the operator without cords to inform him of the extent of the delay and this is stated by the operator. operator without cords according to a bulletin given to her by the surveillance team.

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   This operator without cords can then fill out a form and send it to the operator of the call order table who establishes communication as soon as a free junction can be found. While calls from manual long distance tables to the automatic office on lines on which pulses are not transmitted are not automatically routed to the call order table, equipment is provided on the call order table. calls to establish a connection from one of these trunk lines to the desired outgoing trunk line, so that the operator of the non-pulse switchboard is served by the equipment for deferred calls that the operator of a long distance pulse switch panel.

   The cordless trunk operator, when the opportunity arises, can make a call using her keys and her recorder-sender in order to connect directly to the incoming trunk line coming from A non-pulsed manual trunk board to the operation of the call order switch board.



   Special switchboard positions are provided on this cordless switchboard as a substitute for the call order table, to establish communications if a long wait is encountered to get a free trunk in the event that the call order table. The calls are not in service during a period of normally light load. These communications are established by a cordless mechanism as described below. These switch board positions will be referred to herein as special cordless operating positions, to distinguish them from the call order table which normally occurs with deferred long distance calls.

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   All trunk groups have an overflow trunk group associated with them.These overflow trunks are not part of the trunk trunk group and are tried separately by the marker when it finds all lines interurban areas of the group appear to be busy. If the marker finds all busy trunk lines, it automatically tries the corresponding overflow trunks associated with the trunk group and places the call at the first free overflow trunk found.

   As will be described later, this circumstance depends on different traffic conditions, since when a serious wait occurs, the entire trunk group is made busy and after that the wait is automatically stated when the line trunk tries to reach this group of trunk lines. The overflow control circuit associated with each group of overflow junctions maintains a record of the occupation state of all the junctions by a conductor multiplied at each of the trunk lines taken in particular and also as long as all circuits are busy, it returns a slow shaky signal to the terminating trunk lines connected to it.

   When a trunk of a group becomes free, however, it returns a fast shaky signal known as the new order shaky signal, which is an attempt to establish communication. In this circumstance, if the calling line is not under the control of an operator in the cross-bar long distance office, the remote operator can disconnect the trunk and re-establish it so that she can re-register. the code in the recorder-sender and marker of the interurban cross-bar system in order to make a connection to this free junction.



   The number of overflow junctions provided for @

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 each group of trunk lines varies from 1 to 4 depending on the size of the group of associated trunk lines. The intention is to allow as many circuits to overflow as possible with a reasonable chance of getting a free trunk line within five minutes. The relationship between the size of the trunk group and the number of overflow junctions depends on the number of trunk lines in the group and the destination of those trunk lines.



   In addition to the overflow junctions and associated control circuits, there is also a group of main occupancy junctions which are common to the entire office. When a marker finds all the overflow junctions in a group occupied, he drops the overflow junction feeder relay and grabs a feeder relay to direct the calling trunk line to a junction in the middle. main occupation. The main busy trunk returns a shaky or irregular flashing signal to the calling long distance operator to inform them that these particular long distance lines are in considerable demand at this time and that they may be experiencing. a considerable wait in the establishment of the interurban connection.



   Referring to FIG. 1A, connections of the type described are shown between a trunk switchboard and the cross-bar trunk office CTO, being the trunk switchboard 103-104 / in the vicinity of the cross-bar trunk office. This intercity table is known as the C.L.R. located in a network where it can be reached by a number of local telephone offices. In order to save connections between subscribers and an office,

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 cross-bar trunk, which routes trunk calls to other cities, there may be a number of switch tables C.

   L.R. in various local office networks in a large city, all of which establish trunk line connections for local subscribers within that network, not including the cross-bar trunk office.



   A long distance call request from a 100 A subscriber enters local office 101 and is connected by trunk 102 to the outside toll switchboard 103. The outside toll operator records the long distance call request and initiates an inter-city call request which activates the incoming trunk 105.



   This inbound junction acts on a coupling and the coupling chooses a free recorder-sender 106 schematically illustrated as an AC pulse-generator recorder-sender 107. This recorder-sender as described here can be energized by pulses of alternating current to tune its recorders and can transmit pulses of alternating current for tune recorders in a remote office such as office 111. The long distance code is thus recorded in the recorder-sender 107 which transfers this trunk code to marker 108. The marker activates a particular trunk relay which designates the group of trunk lines to which the terminating trunk line is to be connected.

   The individual trunks of this trunk group are tried by the marker and if a free trunk is available, such as trunk 110, it is chosen by the marker and crossbar switches 109 are operated by the marker to connect the outgoing trunk
110 to the incoming junction 105 to establish the long distance communication between the calling subscriber 100 and the bus

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 reau 111. Office 111 will ordinarily be another long distance office in a remote city and the long distance link may extend to a subscriber of that interurban office network or may extend through this office. long distance to another long distance office to reach the called subscriber.



   If the marker finds all of the group's junctions occupied, it will immediately try the overflow junctions associated with that grouue and if there is a free overflow junction such as the overflow junction.
113, it will choose the overflow trunk and operate switches 112 to link the overflow trunk signal to the calling toll operator at the outside trunk switch panel 103. A shaky signal from the overflow trunk full will indicate to the outside long distance operator that all the trunk lines in the group are busy.

   Under normal circumstances, the outside trunk operator will keep the line on which this shaky signal is given, expecting that in a short time this overflow junction will indicate that a trunk in the group has become free.



  This is indicated by a different shaky signal from the overflow junction to the outside toll operator and if the outside toll operator receives this second shaky signal a second attempt is made to establish the toll communications as set out above.



   In circumstances where the trunk line group is under high demand, the marker may find that all trunk lines in the group are busy and all overflow junctions are occupied and thus a circuit is established automatically. in the marker to cause the selection of a main occupation junction such as junction 115. The mar-

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 Queur thus chooses the first free main busy junction and actuates the crossbar switches 114 to connect the main busy junction to the calling trunk line to transmit a characteristic main busy shaking signal to the trunk operator. exterior of table C.

   L.R. 103, to indicate that an extended wait is to be expected. In these circumstances, this operator will write all the elements of this information on a card and send this card to an operator of what is known as the outside long distance waiting table, represented as table 104 TX, which will be described in more detail below. The on-hold outside long distance attendant will then route the call as soon as it is possible to obtain a free long distance line in the outgoing group leaving the crossbar office. In principle, the outside long distance operator of switchboard 103, trying to establish a long distance call, does not maintain the incoming call for more than five minutes while trying to establish the telephone connection. .

   If this operator does not ensure a free long distance line within this time, she can agree on a call order with the operator of the call order switch panel of the cross-bar long distance office and after having completed a form, it sends this form to the outside operator waiting for switch panel 104.



   In the cross-bar toll office, trunk groups are continuously observed by a supervisory maintenance team and when a trunk group shows considerable wait, that group is made unavailable to operators.

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 such as the operators of the outside trunk panel 103 and this group is then made available only to an outside operator waiting for the call switch panel of the cross-bar office by means of control devices. automatic control. The overflow junctions associated with this group are connected by jacks and plugs to a standby utterance junction 118 associated with the call order switch board 120 as shown in FIG. NOT.

   It will now be assumed that the call shown in FIG. 1A was made under this circumstance where the junction group was plugged in for standby utterance and so the overflow junction 113 shown below as overflow junction 116 was plugged in at the utterance junction wait 113. Therefore, when the marker finds all outgoing junctions in that group busy and chooses an overflow junction, the calling trunk is routed through overflow junction 116 and the connection cord 117 has the waiting statement junction 118.

   The switchboard operator of the call order table 120, after seeing that a calling line has been connected to the waiting utterance junction 118, announces that a wait for a call can be expected. determined time . The announcement indicates to the outside long distance operator or to the outside operators that the communication between the calling subscriber and the long distance table will be cut and that a form will be filled out for a deferred long distance call request, which form is transmitted to the waiting outside operator of switchboard 104 or other similar switchboards from other offices, for the establishment of the link as soon as a junction

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 free can be obtained.

   A number of calling lines can be connected simultaneously to the on-hold utterance trunk, entering from different trunk tables.



   In the above circumstance, when a wait is stated, a request can be made by the outside inter-city operator 104 to the operator of the call order table of the cross-bar switch inter-city office. , provide a long distance line and establish communication as soon as a free line to the remote long distance office is available. This request is made in the manner schematically illustrated in FIG.



  1B. A circuit request (Figs. 1 and 2 are marked CR to mark circuit requests) is made by performing the known digit numbering 151 after the operator has established the connection with the incoming trunk. 122 and recorder-sender 125. As described here junction 122 acts on coupling 124 which chooses a free recorder-sender 125. Code 151 is recorded in recorder-sender 125 eL is transferred to marker 126. In response At this code stored in the marker, a special trunk known as trunk 151 designated 123 is selected by the marker and switches 127 are activated which connect the outside trunk operator 104 to trunk 123 circuit 151.

   This junction circuit terminates in a jack and a signal lamp which is observed by the operator of the call order board 120, who accordingly inserts a corded circuit plug into the jack of the junction. In this example, the outside long distance operator of switch table 104 advises the operator of the call order table that she would like a long distance line to a certain office which is currently on hold. The c-

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 The operator of the call order table then fills out a call order form containing all the information, including the number of the operator who initiated the circuit request call.

   There may have been other requests made for free long distance lines in this group and so the operator of the call order table puts the records in the order in which the calls are received so that they can be routed in that order.



   The call order board 120 is of the cord type and uses twin plugs on the cords to allow bonding on a four wire basis. The plug referred to here as twin plug can be made as a single six-conductor plug to make connections with six jacks of a single jack. Junctions 123, 134 and 136 are four wire junctions terminated in jacks having twin jacks for use with the aforementioned twin plugs. These junctions extend to the crossbar switch racks of the crossbar toll office and although they appear as an outgoing trunk from the call order table, they are associated with it and respond as inbound trunks.

   Each call order position has a ten-button keypad with which attendants can route calls to any destination through a recorder-sender and a marker that choose the desired outgoing trunk. The call log operator can thus establish a communication between a junction 151, denoted as junction 123 and a junction denoted as junction 136 to route a communication request through the outgoing junction 141 to a remote office. 142 or this operator can make a call in both directions using junctions 134 and 136 as shown in FIG. 1 C.

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   On the face of the call order switch board there are also faces associated with each overflow circuit. These are single three-conductor jacks instead of the twin six-conductor jacks as used for other junctions and each position has a number of cords with single plugs that the operator can connect to the terminals. overflow circuits. The operator is plugged into the overflow circuit associated with the group of junctions that interests her and lamps associated with these leads give flashing signals emitted by the corresponding overflow circuits to indicate whether a free junction can be found in this group of circuits.

   When a call is received, using junction 151, the attendant inserts a jumpered plug from the cord circuit into the junction jack and can use the single plug above to note if there is a free junction in the junction. group of the requested junctions, and if so, it can insert the other twin plug of the cord circuit into a junction 136 to establish communication. Otherwise, a form is completed and communication established later.



   A communication established in the manner shown in FIG. 1C is taken from a previous form filled in by the operator u the call order table. When she sees that there is a free junction in one of the groups she is monitoring, the cord circuit plug is inserted into the jacks of junction 136.

   As has been said previously, the call order table oberator has access to the junctions of a group which have been connected for the enunciation of the wait, and which are not automatically available to the operators such as than the operators of the interurban switchboard 103 or the operators of a distant interurban office such as 202 (the DTKP indication means that it is

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 from a remote interurban office with pulse keys, in this same figure, TL is an interurban line).



   Therefore, the operator of the call order table
120, after plugging into junction 136, operates its keypad to record the outgoing junction code in recorder-sender 138. This recorder-transmitter is chosen by a coupling or researcher 137 as soon as junction 136 is energized and sends a signal to the operator to start the pulses. The operator can store the code digits and numeric digits in recorder-sender 138 and the code digits are transferred to marker 139.



   Assuming that the free junction observed by the operator was not chosen by another similar operator it will be chosen by the marker 139 and the crossbar switches 140 will be energized by the marker to connect the outgoing free junction 141 at junction
136. A link is thus made between the call order table 120 and a telephone office 142. This telephone office can be another long-distance office in a remote town and can be either a manually operated office or an office. with automatic operation.



  In either case, a signal is transmitted from the call order table to the office through outgoing trunk trunk 141. The operator of the call order table can choose the outgoing trunk to the designated office so as to be sure that this communication has been established before notifying the outgoing operator that a free trunk has been obtained. As soon as this communication has been established, the operator of the call order table inserts the other plug of the cord circuit into the jack of junction 134. The energization of junction 134 activates coupling 133 which associates the 'recorder-sender 132

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 to the position mechanism 120.

   The operator of the call order table in position 120 now operates her keypad to set the code recorders of recorder-sender 132. This code is transferred to the recorders of marker 131 which chooses a free outgoing link. 130 extending to the outgoing interurban board 104 and energizes the crossbar switches 135 to associate the waiting outside trunk board 104 with the call order board
120. In) this case, the code written by the operator of the call order table is a special code which includes the number of the waiting outside operator of the waiting outside long distance table, operator who has the initial form to establish this interurban communication.

   The outside long distance operator on hold associates the calling subscriber with this communication which is then established. In some cases, a call can be set up in opposite directions by the call order table operator who can first establish the call to the waiting toll operator 104 so that this operator does not. no time wasted in connecting subscriber 100 to the call later. Signals can be transmitted by either of the operators in offices 104 or
142, to the operator of the call order table.



   A lamp is provided for each overflow junction on a traffic monitoring panel to keep the monitoring team up to date with regard to the occupancy conditions of the different groups of junctions. By observing the lighting of these lamps and keeping track of these cards in the positions of the call order table, the principal operator can approximate the length of the wait to be expected at any moment of this

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 period of occupation. As the different groups are occupied and the expectation is estimated, to ensure that the expectation is stated, the junctions are connected for the statement of the expectation and the importance. of the wait is displayed.



   The monitoring panel standby utterance jacks are arranged in groups, for example one group showing a half hour wait, one group showing three quarters of an hour wait, another group showing a half hour wait. one hour and so on for the different expectations that can be stated by the operator of the call order table. To state these delays, one end of a cord is plugged into the overflow circuit jack for a particular group and the other end is plugged into a hold utterance jack for the particular hold at. state.

   Calls which are directed by the marker to the various overflow junctions therefore automatically obtain the on-hold utterance operator hold through the mechanism shown in the above-mentioned figure 1A4. The importance of the expectation for the different groups is displayed so that the operators can observe any change in the expectations to be stated for the different groups at any time.



   When a group of junctions is in standby as shown in the main drawing, Fig. 3, 4 and 5, the markers are informed of the fact by the mechanism associated with their artery relay and do not follow their ordinary course. The overflow junctions associated with the group are connected to the call utterance junction and in doing so another mechanism is automatically put into operation which affects the marker feeder relay which is actuated for choose this group of junctions. Cornrned shown in Fig.

   2, where CTO represents

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 again the intermediate cross-bar office, if the call comes from a remote DTKP key impulse trunk board, it will be connected directly to the COBD call order board operator so that this operator can state the expectation, fill out a form for the subsequent establishment of the communication
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 cation or establish ± é; 1..1 <this-cI. 'r.1 (: l (d.Ü1.t, eT: l2n.t. The difference is automatically established in the marker in order to save on-call time for long distance calls which have been partly established from offices distant long distance.

   A long distance call, coming from an operator producing key impulses from another city, which enters the long distance crossbar system and finds the desired group of junctions in the on-hold utterance, is automatically directed to the switchboard. order of calls by the action of a feeder relay introduced in the circuit, because this call comes from a distant office. If it is possible to do so, the operator of the call order table will establish the long distance call by using trunk 214 "151" and plugging into a trunk such as 220 to obtain the desired trunk line.

   An arrangement of this kind is schematically illustrated in FIG. 2F4. If the desired trunk group has not been branched for wait utterance, the calling trunk is directed to the overflow trunk 212 Fig. 2F2 or to the main occupancy junction 213, Fig. 2F3, in the same manner as explained above for a call from the CLR table shown in FIG. the. Under conditions where a long distance operator in a remote city experiences an unusual wait of more than five minutes, that remote operator may request communication with

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 the operator of the call order table by numbering 151 in the manner explained for the operator of the C.E.R.

   The remote operator can then ask the operator of the call order table to set up the call as soon as possible. If the operator of the call order table cannot establish the communication coming from the junction 151 it will fill in a form and establish the communication later.



   An operator calling from a distant city has another alternative in the cross-bar trunk system when she encounters a hold and the call order switchboard is not served, which may occur. occur during light load periods for most other junction groups. In this case the operator of the interurban switchboard in the distant town can dial the normal circumt request number 151, but since the call order table is not served, automatic arrangements are made to pass the call. 'call, at the cross-bar long distance office, to another special junction here called junction 121, which ends in the switchboard without cords.

   The remote operator, therefore, makes her circuit request to the cordless operator who fills out a plug and causes the communication to be established as soon as possible by a special cordless operator who has circuits arranged as this is shown in Fig. the. Fig. 1E illustrates a special cordless operator position 160 with pathways extending to trunk circuits 161 and 162 to be used as inbound trunk circuits to originating long distance office 104 or 202 and to desired long distance office 163.

   This operator has a keypad and when a free junction is available it activates the recorder-sender 159 associated with position 160

  <Desc / Clms Page number 26>

 which operates a marker 164 to choose an outgoing trunk 166 to the remote office 163, its link to the inbound trunk 162 being established by the crossbar switches 165, thus freeing the marker and recorder-sender to be re-used to make the connection with the outgoing long distance operator. The register-sender 159 of the position is thus again set by the special operator without cords 160 and a marker 158 is chosen.

   In this case, the operator designates the code of the long distance office and the number of the operator of the office of origin 104 or 202. The marker chooses an outgoing junction to the office of origin and activates the switches to crossbars 157 to connect the incoming and outgoing junctions to the original office and the outgoing junction to the desired office via two sets of crossbar switches.



   The call order table 120 serves as a point of clarification for a majority of calls which are seriously delayed. These operators have access to the junctions om groups which are connected for call waiting, while the operators without cords do not have access to these groups and since the call order board receives a flashing as soon as When a trunk becomes free in busy groups, operators are able to establish long distance calls as quickly as equipment becomes free and set them up in the order in which calls arrive in the crossbar long distance office.

   During these periods, long distance calls to busy groups are thus established faster than they could be by the long distance operators outside, including the operators.

  <Desc / Clms Page number 27>

 interurban lines in remote towns and with much less accumulated on-call time for interurban lines. Fig. 2K shows the cross-bar toll office layouts for servicing calls from a manually operated toll office (DTSR).



   DETAILED DESCRIPTION   ---------------------
An incoming call to the crossbar long distance office will be described first, which call may originate from a C.L.R. from the near vicinity of the inter-city cross-bar office or remote inter-city switchboard, from another city, both inter-city switchboards having key-operated equipment for transmitting alternating current pulses to the long-distance cross-bar office in order to adjust the recorders of the recorder-sender of this office.



   Entering the trunk trunk line such as trunk line 650-651 causes a signal to be transmitted to the cross-bar trunk office through the 660-659 compound signaling circuit by associating the battery to the signaling circuit in the long distance office 600.



  It appears unnecessary to describe the operation of the compound signaling relay 619 since this type of compound signaling circuit is well known in the telephone art. Suffice it to say that the trunk office battery 600 causes the energization of the compound signaling relay 619 which connects earth to conductor 662 generally known as conductor E of the compound signaling circuit. This earth extends through contact 7 of relay 620 and the winding of relay 616 to the battery actuating the relay.

  <Desc / Clms Page number 28>

   616. This earth also extends through contact 8 of relay 620 and the coil of relay 628, to the battery which actuates relay 628.

   The relay 616, in operation, detaches the earth of the compound signaling conductor 661 "M" and associates the battery with this conductor by passing through the lamp 617. The office 600 has in it a compound signaling relay identical to the relay 619 which is put into action when the battery is associated with the "M" conductor 661. This, however, does not cause the release of relay 619 but transmits the signal to office 600 which is held until a record. incoming receiver-sender is associated with the incoming junction, Fig. 6, and be ready to receive the AC pulses from the operator at office 600.

   Relay 628, in operation, connects earth to the time counter circuit comprising a capacitor 627 which is discharged, if any charge remains in this capacitor, and a tube 623 with the circuit network associated with it. The relay 621 is also actuated by the intermediary of an obvious circuit passing through the contact 3 of the relay 628. The relay 621 while functioning is blocked by its contact 3 under the control of the ion tube 623 which is the means which will do it. fall back later. Earth is disconnected from traffic recorder conductor 670. Relay 621 also prepares a circuit to connect 130 volt battery 672 to ion tube 623 when relay 628 is released.

   Earth is also connected to the start conductor of coupling 663 from the earth applied to contact 1 of relay 621, through contact 5 of relay 620 and thence to the coupling to energize the start relay. This type of coupling 635 has a control circuit associated with it in order to choose the type of recorder-sender which is indicated to it by the control circuit.

  <Desc / Clms Page number 29>

 junction. In this case, the junction circuit indicates the selection of an incoming recorder-sender arranged to receive alternating current pulses and therefore this type of recorder-sender illustrated schematically as recorder-sender 636 is chosen by the coupling.

   The switches of the coupling are activated after selecting this recorder-sender to connect conductors 664-668 and conductors 680-683 to the recorder-sender mechanism. This recorder-sender as will be described in detail is shown in Figs. 23 to 35 included drawings.

   A number of recorder-sender relays are actuated by the coupling control circuit before
 EMI29.1
 the eneegietreur-envoye1Jr is connected by switch contacts to the junction, Fig. 6, and thus the earth is connected by the recorder-sender to the conductor 664 to actuate the relay 620 and the earth is also connected to the conductor 680 extending through the relays 609 and 615, to the battery. by relays 609 and 615 inside the recorder-sender establishes a control circuit for a recorder-send relay which has high resistance and only actuates relays 609 and 615 after reception by the recorder-sender of category signals. At this time, a low resistance is associated with the conductor 680 as described below.

   The relay 620 while operating establishes a blocking circuit by the contact 1 of the relay 621 and removes the earth of the conductor 663 for starting the coupling. Relay 620 likewise opens the initial control circuit for relay 616 but this relay remains actuated by contact 7 of relay 620 on the earth applied to contact 2 of relay 631. Relay 620 also connects the earth to conductor 683. extending to recorder-sender and conductor 642 extending

  <Desc / Clms Page number 30>

 through the crossbar switches to later hold the crossbar switch holding magnets in the usual manner.

   A category signal is transmitted to the recorder-sender from earth to contact 3 of relay 615 through the intermediary of conductor 667, which indicates to the recorder-sender the type of junction connected to it.



  Since in this case the recorders of the recorder-sender must be regulated by pulses of alternating current, a relay is activated in the recorder-sender to associate the pulse leads 681 and 682 with a receiver circuit. alternating current pulses associated with the recorder-sender. Other relays are activated at this time to make the recorder-sender to receive alternating current pulses and after this adjustment of the recorder-sender, a low resistance is read back to conductor 680 to activate the relays. 609 and 615. The operation of relay 615 establishes a circuit through its contact 4 to actuate relay 631 which locks on the earth applied to contact 1 of relay 620.

   The operation of the relay 631 causes the release of the relay 616 and then at this moment there remains no established circuit nour this last relay. Releasing the relay 616 removes the battery of the "M" lead 661 for signaling which signals the operator of the trunk office 600 to continue transmitting pulses of alternating current.



   The switchboard position of the interurban office 600 has a keyboard substantially the same as that shown in FIG. 11 and an alternating current supply circuit substantially similar to that shown in FIG. 15, the two circuits will be described in detail later. Maneuvering these keys

  <Desc / Clms Page number 31>

 by the operator of the trunk office 600 transmits currents of two frequencies for each digit through the trunk line 650-651 through the hybrid coils 601 to the conductors of the incoming trunk, Fig. 6. The circuit is balanced by passing the pulses of alternating current to the two channels, the lower channel being connected by contacts 2 and 5 of relay 615 which are linked by resistor 632.



  The alternating current pulses passing through the upper path extend through contacts 2 and 5 of relay 609, thence through tip and neck conductors 681 and 682 to the receive circuit associated with the recorder. sender 636. As will be shown in the following, the receiver circuit actuates two relays of impulses according to the current at two signal frequencies which actuate the recorders of the recorder-sender by transforming these currents of two direct current frequencies to operate the recorders of the recorder-sender according to the number transmitted. The callsign and digital digit pulses can be transmitted and recorded in the sender register 636, with the call sign digits transferred to marker 700.

   These code digits are transferred from the recorder-sender recorders to the marker recorders.



   In response to the setting of the marker registers, a route relay is activated to select a trunk from a trunk group in accordance with the code registers. As previously established in the general description, the junctions of this group, following the route relay actuated, are tried in an attempt to find a free junction extending to the desired remote toll office. If all the junctions of this group are occupied, an overflow junction is automatically chosen by the marker

  <Desc / Clms Page number 32>

 to indicate to the original attendant that all the trunks in the group are busy.

   When all the group's junctions are busy and the overflow junctions associated with this group are also all busy, the marker automatically associates the calling line with a main busy junction to indicate to the calling operator that a sensitive wait. can be encountered. This operator can then make a circuit request to the call order switch board and notify the operator of the call order switch board to get a free trunk as soon as possible.

   Fig. 7 illustrates their crossbar switches for connecting the calling line to either an outgoing trunk trunk, FIG. 7B and Fig. 22, or at an overflow junction Fig. 7C and Fig. 5, or at a main occupancy junction, Fig. 7D (MBT) or at a special junction to the call order switch panel, Fig. 7A (COBD).



   The connection to an outgoing trunk junction following the code stored in the marker will be described first.



   EXIT JUNCTION TEST ---------------------------
The parts of Marker 700 to which the invention relates are shown in Figs. 3 and 4, a group of junctions schematically represented as junctions 0 to 35 (OGTO ...



    OGT35) at the bottom of Fig. 4 having four overflow junctions 36 to 39 (OVT36 ...) associated with it, the conductors extending from these junctions through the contacts of a terminal block relay 430 (TBR) to the test relays 410 to 421 inclusive. The register - whose registers are indicated by sender REG 300 / represents sender register 635 which is connected by a marker connector 301 to the marker mechanism. This recorder-sender is shown

  <Desc / Clms Page number 33>

 in Figs. 23 to 35, inclusive, as described below.



  The marker recorders are shown schematically retort a rectangle 325 with a circuit extending through relays 320 and 321, to feeder relay 310. For this description it can be assumed that feeder relay 310 was actuated in response. to the code registered for the outgoing trunk link, Fig. 22, extending to trunk office 2230. It can also be assumed that junctions 0 to 35, shown schematically in FIG. 4, represent a group of junctions as shown in FIG. 22. Circuits extend through the contacts of feeder relay 31U, to mark the number of junctions to try in that cluster.

   As indicated there are thirty-six junctions in the group and therefore relay 410 is activated to mark the start of this group for the zero junction and relay 411 associated with junction 35 is activated to indicate the start of that group. end of this group. Junctions starting with junction zero are therefore tried in an attempt to find a free junction. In Fig. 4 Test relays are shown only for zero junction and 35 junction. There is however a set of relays such as 410, 414 and 418 for each junction in the group.

   The total number of relay sets in this group is therefore forty sets of relays, thirty six for outgoing trunk junctions and four for overflow junctions associated with trunk junctions in this group. The relay 406 is actuated by the battery by a circuit comprising: the winding of this relay, the contact 2 of the feeder relay 310, the contact 1 of an overflow control relay 402 and the earth.

   The relay 410 is actuated by the battery by a circuit comprising: the winding of this relay, the contact 4 of the arterial relay

  <Desc / Clms Page number 34>

 re 310, contact 1 of relay 401, contact of relay 406 and earth - Relay 411 is actuated by the battery by a circuit comprising: the winding of this relay, contact 3 of the relay artery 310, contact 2 of relay 423, contact of relay 406 and earth. Referring to the junction circuits shown schematically at the bottom of FIG. 4, there are shown relays which operate when a junction is taken for use, thereby connecting earth to a conductor extending to the test relays when a junction block relay is actuated under control. 'an artery relay.

   When the zero junction is occupied, the earth is thus connected to the conductor 450, through a contact of the terminal block relay which extends
Dar contact 1 of relay 418, the winding of relay 414, to battery 437, thus energizing relay 414.



  All junctions which are occupied are therefore indicated in the test relays by the operation of relays such as 414 to 415, as soon as the group of junctions is associated with these test relays. A free junction is captured by the operation of a relay such as 418 and 419.

   The test circuit extends through the start and end relays, comprising, earth 436, contact 3 of end relay 411, contacts 2 and 3 of start relay 410 and armature 1 of relay 414 If this junction is free, relay 414 is normal and thus the circuit extends through rear contact 1 of relay 414 and the winding of relay 418 to battery 438. If junction zero is occupied, relay 414 is activated and thus the circuit extends from armature 1 of relay 414 by its associated internal contact, to the armature of the adjacent junction relay which, if this is free, will activate a relay similar to relay 418;

   But

  <Desc / Clms Page number 35>

 if this junction is occupied, the conductor extends by this chain continuing through the entire group of relays from junctions 414 to 415 until the relay is found which is not actuated If junction 35 is li - bre, the circuit will extend through the armature and the rear contact 1 of relay 415, and the winding of relay 419 to the battery which would actuate relay 419. When a free junction is found, the operation of a relay 418 or 419 or of any intermediate relay connects the battery 439 by the contact 2 of the actuated relay to the selection magnet of the primary crossbar switch connected to the free junction.

   The earth 440 also extends, through the front contact 1 of the actuated relay 419, the conductor 451 and the winding of a relay of the free junction circuit, to the battery, which actuates this relay and then causes operation. of another trunk circuit relay which connects earth to conductor 451. Marker 700 then operates the crossbar switches to connect the outgoing trunk trunk, FIG. 22, at the incoming junction, Fig. 6, and to the associated recorder-sender, until this moment the counting relays 609 and 615 are actuated.

   The outgoing junction circuit mechanism, Fig. 22, and the recorder-sender are operated as will be described below, causing the recorder-sender to transmit either alternating current pulses or direct current pulses, depending on the nature of the long distance call, to adjust the recorders of a recorder-sender of the office to which the outgoing junction is connected, Fig. 22.



  After this operation made by the recorder-sender, the relays 609 and 615 are released and the calling party is connected to the called party through the trunk line.

  <Desc / Clms Page number 36>

 



   IF ALL JUNCTIONS ARE OCCUPIED.



   -------------------------------------
Returning to the operation of terminal block relay 430 and assuming that junctions 0 to 35 are all occupied, earth will be connected to all of the junction conductors such as 450 to 451 and thus relays 414 to 415 including all relays. intermediaries of this kind for relays 1 to 34 are activated, indi. when all the junctions in the group are busy.



  When all the junctions of a group are occupied, the overflow relay such as the overflow relay 555 in Fig. 5, is released. Relay 555 is kept actuated by conductors coming from each free junction connected to earth as shown for junctions 0 to 35. Thus, when all the junctions of the group are occupied there is no circuit established for overflow relay 555 and released. Under these conditions a circuit is established comprising: the 48 volt battery 557, the resistor 561, the contact 1 of the overload relay 555, the contact 5 of the relay 541, the conductor 578, the contact 1 of the regulated feeder relay. the link 310, the polarized relay 308, the coil of the relay 304 and the battery.

   Relay 304 operates in this circuit, but polarized relay 308 does not operate since current is not sense ¯ to it to operate. Relay 304, while operating, associates the earth through contact 2 of relay 306, the contact of relay 304, the left winding of relay 401, with the battery, activating relay 401 which locks to earth through through its right winding and contact 3. The operation of relay 401 determines the release of start relay 410 for the group of regular outgoing trunk trunks, thus establishing a circuit for the overflow relay. 402.

   The circuit for relay 402 includes: battery, winding) ,, /

  <Desc / Clms Page number 37>

 this relay, contact 1 of relay 401, contact of relay 406 and earth. Relay 402 is blocked by its contact 3 to earth. Relay 412 is now actuated to indicate the starting point of the group of overflow junctions. The circuit of relay 412 comprises: the battery, the winding of this relay, the contact 2 of the relay 411, the coatact 3 of the relay 424, the contact 8 of the relay 402 and the earth. The operation of relay 412 establishes a circuit for relay 423, comprising: the battery, the winding of this relay, the contact 4 of the relay 402, the contact 1 of the relay 412, the contact 2 of the relay 411, the contact 3 of relay 424, contact 6 of relay 402 and earth.

   Relay 423 is blocked to earth by contact 2 of relay 402 and its contact 1. The operation of relay 423 releases the end of group relay 411 since the circuit to keep this relay in action went through. a contact of relay 423. Relay 424 operates in a circuit comprising the battery, the winding of this relay, contact 1 of relay 411, contact 1 of relay 413, contact 3 of relay 423, and earth.

   Relay 424, while operating, establishes an earth blocking circuit for itself through its contact 2 and contact 3 of relay 423. The overflow group end relay 413 is now actuated by the battery in a circuit comprising the winding of this relay, contact 1 of relay 424, contact 6 of relay 402 and earth.

   The overflow junctions test cannot be done until relay 411 is released, but after releasing relay 411 and operating overflow group end relay 413, the assay of overflow junctions is done in an attempt to find a free overflow junction, in order to signal to the originating trunk operator that all

  <Desc / Clms Page number 38>

 of the desired group are busy. Four overflow junctions are shown for this group of junctions and the test is made for these junctions shown schematically as junctions 36 to 39. A circuit is established, comprising: earth 436, contact 2 of relay 413, contact 2 of relay 412, contact 3 of relay 412 and armature 1 of the first overflow relay 416.

   The overflow junctions are tested in the same way as the outgoing junctions of the regular group and therefore, if the first overflow junction is free, the circuit extends through the coil of the relay.
420 to battery 438, actuating relay 420 and establishing a circuit through lead 442, for the selection magnet of the first overflow junction, referred to herein as junction 36. When the first overflow junction is occupied, the relay 416 is actuated by the earth applied to the conductor 452 as explained previously and the circuit is extended by the first contact
1 from relay 416 to the other test relays of the overflow group.

   If the last overflow junction is free, relay 421 is actuated, but if all four overflow junctions are occupied, the circuit extends through internal contact 1 of relay 417, contact 4 of re- leaves 413 and the winding of relay 425 to the battery, which tells the marker that all regular junctions in the group and all overflow junctions supporting that group are busy, with the marker operations responding to this case. will be described later, since under these conditions the calling trunk line is directed to a main busy trunk.

   It will first be assumed, however, that the last trunnion junction is found free and that thus relay 421 is actuated to connect the battery in its contact.
2, through the conductor 443, to the magnet of

  <Desc / Clms Page number 39>

 selection of the crossbar switch connected to the overflow junction circuit. It can be assumed that this is the crossbar switch shown in Fig. 7C, which is the same as the primary crossbar switch 500.



   After grasping the overflow junction shown in Fig. 7C and in FIG. 5, the marker immediately associates the earth with the battery by passing through the winding of the relay 505, which actuates this relay, and also chooses, through the intermediary of the cross-bar switches, a path to the incoming junction, Fig. 6, actuating the crossbar switches to associate the overflow junction first with the recorder-sender connected to the incoming junction, FIG. 6, and later to connect the overflow junction directly to the calling long distance operator. The operation of relay 505 energizes extra-normal relay 530 and establishes a circuit passing through the winding of relay 504 to the battery.

   This last circuit, extending through contact 1 of relay 505 and contact 5 of relay 504 or shock relay, is connected to the midpoint of the delay coil / 503 and is extended to the battery by a circuit comprising: the conductors of lines 501 and 502, the contacts of the cross-bar switches, contacts 1 and 6 of the incoming junction relay 615, conductors 667 and 668, the recorder-sender and a control relay of the recorder-sender. This recorder-sender control relay operates through a high resistance winding and therefore does not actuate relay 504 until other recorder-sender devices have operated.

   After these other recorder-sender devices have operated, a low resistance is associated with the circuit for relay 504 and at this time relay 504 operates.

  <Desc / Clms Page number 40>

 to establish circuits in the overflow junction.



  Relay 504 is blocked by its contact 5 and contact 1 of relay 505 and establishes an obvious circuit for the traffic sign lamp 508. The recorder-sender now operates to release relays 609 and 615 which connects the circuit. overflow to the calling interurban operator. The marker and the recorder-sender return to standby after this since their functions are completed - Returning to the operation of relay 530 when the overflow junction has been entered it appears that contacts 1 and 2 associate the earth by the inter - mediary of switch contacts 534 and 536 which operate intermittently and release relays 537 and 538. Switch 533 has a speed such that it indicates to the calling long distance operator that all the junctions are busy at this time.

   A circuit is established, comprising: earth, contact of relay 537, contact 3 of relay 555, contact 7 of relay 541,. the winding of relay 540, contact 1 of relay 541, contact 3 of relay 530, resistor 531 and the battery, thus actuating relay 540 each time switch 533 and relay 537 are operated. The interrupted operation of relay 540 associates the earth via a circuit comprising: its contact 1, resistor 532, the shock contact 6 of relay 504, the delay coil / 503, the line conductors 501 and 502 which s 'now extend, through the circuit of the incoming junction, to the calling operator.

   Under normal conditions the calling long distance operator will keep the long distance line, waiting for a new signal indicating that an outgoing long distance trunk has become free while keeping the long distance line. This new order signal is automatically sent to the calling long distance operator when the re-

  <Desc / Clms Page number 41>

 lais 555 works again. It is clear that this latter relay operates again from earth through the contact of any junction relay 0 to 35 which becomes free and releases its relays. Operation of relay 555 opens the contact circuit of relay 537 and closes a circuit to earth on relay 538.

   This relay is actuated at a frequency different from that of relay 537 and indicates to the calling operator that a junction has become free. This circuit includes: relay 538 contact, relay 555 contact 2, relay 541 contact 7, relay winding
3540, relay 541 contact 1, relay 530 contact /, resistor 531, and battery. The relay 540 is thus actuated and released intermittently, to associate the earth via the resistor 532 and the contact 6 of the relay 504, at the middle point of the delay coil or shock / 503, which changes the flashing period towards the calling long distance operator.



  The calling long distance operator will, in response, release the junction at the cross-bar toll office in order to release the mechanism of the incoming junction and the link at an overflow junction and seizes this junction or another junction again. to the crossbar long distance office in an attempt to obtain a free outgoing trunk to the desired destination.



   MAIN OCCUPATION JUNCTION --------------------------------
For this part of the description it can be assumed that all the junctions FIG. 22 are busy and all overflow junctions associated with that group are busy. As will be remembered, when all the junctions, Fig. 22, are occupied, relays 414 to 415 representing the thirty six junctions, are active

  <Desc / Clms Page number 42>

 born, since the earth is connected to the associated conductors 450, 451, and therefore a transfer is made automatically to the overflow junctions associated with this group.

   After completion of this transfer, it is found that all the overload junctions are busy, which is indicated by the operation of relays 416 and 417. At this moment the relays 410 and 411 are released and the start relay 412. and the end relay 413 are actuated. Therefore, a circuit is automatically established to transfer the incoming call to a main busy trunk of which there is a group common to the office equipment.

   A circuit is established for the relay 425 comprising: the battery, the winding of this relay, the contact 4 of the relay 412, the contact 2 of the relay 416, the relays representing the overflow junctions, the contact 2 of the relay 417 , contact 3 of relay 413 and earth. Relay 425 activates the steering switch mechanism through the conductors (marked RRSM, Fig. 4) and establishes a circuit for relay 323 through contact 2 of an overflow relay 402. The direction switch mechanism sets the marker mechanism so that a circuit is established, including: ground, counter1 of relay 323, resistor 324, and other mechanisms. marker, main busy feeder relay coil 309, relay coil 314, and battery.

   Relay 314 does not operate in this circuit, but feeder relay 309 operates to control the test of the main occupancy junctions (by TCMB conductors, Fig. 3). After actuation of relay 323 and its blocking by its contact 2, the junction test mechanism shown in FIG. 4 is fully released and re-employed to try out main occupation junctions in order to choose a

  <Desc / Clms Page number 43>

 free junction among these.

   A terminal block relay associated with these main occupant junctions is actuated accordingly to connect the junctions to the mechanism of FIG. 4 and the testing of junctions is done in the same manner as previously described for testing other junctions of a group. : = preselection of a free main occupation junction, shown schematically in Fig. 7D (where MBT refers to the main busy junction), the crossbar switches are activated to connect this free junction to the incoming junction, Fig. 6, and a flashing signal from the main busy trunk mechanism is transmitted to the calling trunk operator who recognizes it as an indication that the regular group trunks and trunks:

   overflow are occupied and that, therefore, this group is the subject of considerable demand.



   Note that the overflow signals as well as the main occupancy signal are transmitted by associating the earth, with different interrupt speeds, with the circuit of the incoming junction, Fig.6.



  This earth is transmitted through the intermediary of the conductors 643 and 644 and the delay coil 614, to the composite signaling circuit, by the contact 4 of the relay 620, and the winding of the relay 616, to the battery. The association of the earth on this circuit, therefore, intermittently activates and releases the relay 616 which alternately connects the earth and the battery to the "M" conductor 661 of the compound signaling circuit.



  A similar relay, the same as relay 619, housed in trunk office 600, is released and energized intermittently in response based on the speed of the switch associated with these different circuits. The

  <Desc / Clms Page number 44>

 interurban office relay 600 has a conductor E similar to conductor 662 which is connected to a signaling circuit in order to give signals to the operator of the interurban office, reporting to him the conditions encountered in the desired trunk group of the cross-bar intercity office.



   PH CALL CIRCUIT REQUEST.



   ---------------------------
The long distance operator of the long distance office
600, which can be a C.L.R. or a long distance office in a remote city, can now choose to place a circuit request call to the operator of the call order table of the cross bar long distance office, asking her to obtain a free trunk in the desired group as soon as possible and connect it to this free junction. In this case the operator of the long distance office 600 gives the operator of the call order table the number of the operator initiating the long distance call, so that the operator of the order table Calls may include this information in a form running the circuit request for free penesion in a particular group of trunks.

   The operator of the call order table, when calling the long distance office 600, includes this operator number in the code transmitted by pulses, when she has obtained a free trunk.



   A special code 151 is used by toll operators to make a circuit request to the operator of the call order switch table in the toll crossbar system. This code is produced by the long distance operator on keys as described previously which, in this network, transmits alternating current of different frequencies to adjust the recorders in the recorder-sender.

  <Desc / Clms Page number 45>

 636. This can be the same recorder, or another, as the one used and on the previous call when this operator was trying to get a link at the desired junction. The code 151 which is put on the recorders of the recorder-sender is transferred to the recorders of the marker 700.

   It can be assumed that this code 151 has been recorded on the recording relays 325 shown in the lower part of FIG. 3 and that this setting of the loggers operates the feeder relay 151 designated as 312. The feeder relay 312 is energized in the from two different sources, one of the / request circuit which registers in response to a code 151 which has been formed by dial or by keys as has just been described, and the other source resides in an automatic switching arrangement responding to the registration of a group code of regular junctions when this group is plugged in for wait saying.



  This will be described later along with the standby utterance mechanism which is operated when a trunk group is plugged in for standby utterance, i.e. with the branch cord and the connectors. plugs 510 fed into jacks 509 and 511. In the case now described where feeder relay 151 is actuated by the marker code recorders, the trunk group tests as shown in FIG. 7A are made by the test relays shown in Fig. ,. in the manner previously described.

   Feeder relay 312 carries contacts for controlling, through conductors marked TC 151 T, the start point and end point of the group test and the group's occupied junctions are designated in the same way as this. has been shown for the group of junctions previously described as the junction shown in Fig. 22. When the marker finds a free junction 151, the selection magnet associated with;

  <Desc / Clms Page number 46>

 bar switch: cross connected to this junction is energized and relay 728 is actuated by a marker earth designated in FIG. 4 as earth 440 described above.

   This earth extends from the marker, through a circuit comprising: the conductor 740, the terminal block relay 715, the contact 1 of the relay 712, the winding of the relay 728, to the battery . A free junction is thus taken for use and the marker energizes cross-bar switches to connect this junction 151 shown to
Fig. 7A, at an incoming junction shown in FIG. 6.



   This incoming trunk may or may not be the same as that used for the call described above which was directed to the overflow by the main occupation, but not of the same type as that used for the previous call. The operation of relay 728 provides blocking grounds for various circuits which will be distinguished later. The marker then operates relays in the junction circuit to indicate the type of junction circuit that has been connected to it.

   For example, if office 600 is a remote office connected to the long-distance cross-bar office by a long junction, this will be indicated on a category relay to the recorder-sender and marker from the junction shown at Fig. 6, and the marker connects, in response, a high voltage circuit comprising the incoming junction, conductor 641, the top or shock winding of the delay coil / 714, contact 2 of relay 712, l lower winding of relay 725 and earth.



   The operation of relay 725 is now described since there are occasions when this trunk is used by the call order table for a toll communication to an outgoing trunk if it so happens. a junction became free between the moment when the calling operator tried to obtain

  <Desc / Clms Page number 47>

 when a free trunk was made, and when it made its circuit request call. Operation of relay 725, as will be seen later, establishes a circuit in a call order table position mechanism 1a to indicate the type of incoming trunk line. If this incoming line is long and is connected to an outgoing line which is also long, a repeater is introduced in the outgoing trunk line.

   This indication is therefore necessary for transmission over long lines. If the call is from a short trunk line, such as from a local C.L.R. trunk switchboard, relay 725 is not actuated.



  With relay 725 actuated, establish a blocking circuit to earth applied to contact 4 of relay 728, for itself, by its contact 1 and its upper winding.



   The junction circuit 151, Fig. 7A, is used by different trunk offices having different types of trunk circuits exiting from these trunk switchboards. These trunk trunk circuits can be of the key impulse type, trunk trunk with calls on the circuits, or trunk trunk with call on the auxiliary lines and automatic listening of the incoming operator. .

   When a call originates from a trunk trunk with a call on the circuits, an indication is given to the recorder and to the marker by the incoming trunk arranged in a manner somewhat different from the trunk shown in Fig. . 6 which actuates a marker relay causing the marker to connect the battery to the circuit of the incoming junction, the circuit comprising or shock the lower winding of the delay coil / 714, contact 3 of relay 712, contact 3 of the circuit control relay 727 ¯with inrush on circuits and earth. Therefore, if junction "151" 7A is connected to

  <Desc / Clms Page number 48>

 an interurban junction with call on the circuits, the relay 727 is actuated and blocked, from the battery, passing by its lower winding and its contact
4, to the earth applied to contact 4 of relay 728.

   This relay is actuated in order to control the type of signaling to the originating interurban operator.



   At this time the marker having fulfilled its role can be released, but the recorder-sender is kept connected to the junction of FIG. 6 until another mechanism of the junction Fig. 7A is actuated and the relays 609 and 615 released in the manner previously described. The marker before its release, energizes the relays of the recorder-sender to connect a relay to the battery via a high resistance, by a circuit comprising: the conductors 643 and 644, the delay coil 705, contacts
1 and 2 of relay 711, resistors 709 and 710, contact 5 and the winding of relay 712.

   The associated recorder-sender relay is activated, as a signal meaning that the outgoing interurban junction is connected by the crossbar switches, and then associates a low resistance to relay 712, determining the operation of the bus. relay
712. The relay 712, a working one, is blocked by its contact m 5 to the earth applied to the contact 2 of the relay 728 and also establishes a circuit from the battery to the earth by its contact 6, the contact 3 of the relay 729 and the lamp 733. At this time, the recorder-sender mechanism is readjusted so as to release relays 609 and 615 to connect the calling operator of the trunk board to the terminals of jacks 726 and 724.

   This lamp 733 and the jacks 723 and 724 are located in a position of the COBD call order switch board and indicate to the operator from this position an incoming call. Relay 72

  <Desc / Clms Page number 49>

 712 further detaches relay 728 from its contact 1 and
 EMI49.1
 associated the earth to cond1c1., e "}" '740 ver? 15. i; i <p., <g;, n ... 1, As explained previously, this earth extends to a contact of the terminal block relay 715, so that when this terminal block relay is actuated again, this junction appears occupied to the marker test relay as explained previously regarding the junction test circuit, Fig. 4, as shown in FIG. 4 by conductors 450 and 451.



  Relay 728 is kept operable by the contacts of the cross-bar switch by conductor 642 going to ground in the recorder-sender which is held on this conductor until the recorder- sender has released relay 615. At this moment, conductor 642 extends through contact 7 of relay 615 to the earth applied to contact 2 of relay 620. Consequently, relay 728 is kept activated for the entire period. where junction circuit 7A is used. This circuit arrangement also applies to various other types of trunk circuits.



   THE CALL OPERATOR ANSWERS THE CALL
FOR CIRCUIT REQUEST.



   --------------------------------------------
The call receives an answer from the gold switch panel
 EMI49.2
 call by maneuvering the conversation key 803 and inserting the twin plug 800 or the twin plug 820 in the jacks 723 and 724. The junction circuit relay 716 is thus actuated by a circuit comprising: earth, l The upper winding of this relay, the jack socket and plug, contact 4 of relay 802, lamp 809, resistors 811 and 810, and the battery. The operation of relay 716 establishes an obvious circuit for relay 729, which operates.



  Relay 716 also connects the earth to the battery via a circuit comprising: resistor 713, contact 4

  <Desc / Clms Page number 50>

 of relay 712, resistor 709 and 710, contacts 1 and 2 of relay 711, upper and lower windings of delay coil 705, tip and neck conductor, crossbar switches, conductors 643 and 644, contacts 1 and 6 of relay 615, the upper and lower windings of the delay coil 614, resistors 610 and 611, contact 4 of relay 620,

   and the winding of relay 616. Operation of relay 616 establishes a circuit through conductor "M" 661 of the compound signaling circuit to activate a relay similar to relay 619 in trunk office 600 for - tell the original long distance operator that the call has been answered by the operator of the call order switch panel. The operation of the conversation key 803 activates the relays 802 and 815 and causes the association of its telephone circuit, FIG. 9, to the transmission circuit. The relays 802 and 815 are energized by a circuit comprising: the upper contact of the conversation key 803, the conductor 838, the contact 1 of the relay 900, and the earth applied to the contact 2 of the relay 943 which is actuated at this time. .

   Relay 943 is actuated when an operator serves the position of the call order switch board since headset 941 is connected by jacks 902 and 903 to the telephone transmission coils.



  The relay 901 is also energized by a circuit comprising the battery, the winding of this relay, the conductor 839, the lower contact of the conversation key 803 and the earth applied to the conductor 838, which earth is replaced as soon as the relay 901 operates. .



  After the operation of the relay 901, the earth extends to the battery through a circuit comprising: its contact 1, the conductor 832, the contact 7 of the relay 802,, the

  <Desc / Clms Page number 51>

 windings of relays 802 and 815, and also contact 7 of relay 815, the lower contact of the conversation key 803, the conductor 839, the winding of the relay 901, this relay thus remaining actuated as long as the conversation key is manipulated.

   This earth change is made since relay 900 is actuated by contact 8 of relay 901 which actuates relay 906 for signaling of grouping of positions (PG conductors). The operation of relay 901 connects winding 924 of the telephone circuit hybrid coil to one side of the four-wire transmission circuit and connects winding 927 of the telephone circuit hybrid coil to the other path of the four-wire transmission circuit.

   Relay 1006 is actuated in response to the operation of relay 802 by a circuit going from the battery to earth and comprising: the winding of this relay, the winding of relay 1011, (marginal polarized), conductor 831, contact 4 of relay 802, socket of plug 800 and jack 723, and the top winding of relay 716. The circuit going to the telephone circuit from the top channel of the four-wire circuit includes contacts 1 and 2 of relay 802, conductors 836 and 837, contacts 1 and 2 of relay 1006, contacts 1 and 2 of key 1004, contacts 1 and 2 of key 1001, conductors 1041 and 1042 , contact 5 of relay 901, and the winding of hybrid coil 927.

   The conductors coming from the bottom track of the four-wire circuit go to the telephone circuit through the contacts of the key 801, the contacts 5 and 6 of the relay 802, the conductors 834 and 835, the contacts 4 and 5 of the relay 1100, contacts 3 and 4 of relay 1006, contacts 3 and 4 of key 1001, conductors 1043 and 1044 and contact 4 of relay 901 up to winding 924 of the hybrid coil

  <Desc / Clms Page number 52>

 of the telephone circuit. The hybrid coil windings 922 and 930 are in the conversation circuit of the telephone set, since it can be seen that these coils are in series with the coils 918, 919 and 920.



  Hybrid coils 923 and 929 are placed in the network circuit in series with network coils 939, 93 and 937 and receiver 932 to balance the four-wire transmission circuit.



   The calling trunk operator of trunk switch panel 600 can now notify the operator of the call order switch panel that she has tried to obtain a trunk for a trunk call, that the trunks of this group were busy,

     and that elis is delirious to leave a request for long distance communication through a trunk of that particular group of trunks when a free trunk becomes available. that the operator of the call order switchboard knows that this particular group of trunks is not on hold and therefore that a trunk of this

  group may have become free, an examination of the state of the trunk group is made by the operator of the call order table by putting the 567 card in the jack ,,:; 4.

   The springs of jack 564 of the COLD call order board are connected to a contact of the barter-fill relays such as relay 535 which, when released, indicates whether all the junctions in the group are occupied and, when operating, that there is a free junction in the group. (These conductors are shown, conductor 575 and conductor 576. Conductor 575 is connected to a contact of an overflow relay associated with the terminal group of junctions and conductor 576 extends to an overflow relay. -full associated with an intermediate group

  <Desc / Clms Page number 53>

 of junctions.

   This distinction is made for the operator of the call order switchboard because a telephone communication through an intermediate junction can extend over a long distance by passing
 EMI53.1
 by other CO tables! ! [intercity flutters, and a communication with a terminal trunk is usually terminated in the network in which the crossbar office is located. Regardless of the examination of the type of the trunk junction, when the overflow relay such as 555 is actuated, a circuit is established between the earth and the battery passing through the contact of this relay, the lamp filament. 566, the contact of the key 580 and the contact 572 of the switch 571.

   The flashing of the lamp 566 then indicates to the operator of the call order switch panel that there is a free trunk in the group of trunks desired by the calling long distance operator. A ground on conductor 576 would cause lamp 565 to flash to indicate to the operator of the call order switchboard that an intermediate junction is free in the desired group. The flashing light can be seen to help the attendant decide whether the call should take precedence over the other calls in this trunk group. If at this time the operator of the call order switch table believes that the long distance call would extend through this free junction, the plug 520 can be used to establish the communication as described below.

   Under the preceding conditions the junctions of the junction group may remain occupied, which would be indicated by the absence of flashing on either lamp 565 or 566. As a consequence of this, the operator of the switchboard order of calls would fill out a form and establish communication as soon as possible. After that, the operator would remove the 800 plug from the jacks

  <Desc / Clms Page number 54>

   723 and 724, causing relays 71b and 729 to be released. The calling long distance operator also removes the plug from the long distance switchboard jack, releases relay 619 which, in turn, drops relay E2E.

   Releasing relay 628 releases relays 621 (differential relay) and 620, and thus releases the crossbar switches by opening the crossbar switch magnets circuit. This opens the hold circuit for relay 728 in junction 151, dropping relay 712, which completes the junction circuitry.



   HOLDING STATEMENT FOR DLS CALLS FROM
OF INTERURBAN SWITCH PANELS
Jacks such as 509, associated with the various office overflow junctions and jacks such as 511, connected to the Hold Saying Circuit (DOC), are located in a supervisory panel which includes jacks, lamps and control keys, the operation and maintenance of which are under the control of supervisory personnel from the interurban cross-bar telephone office.

   This group of staff observes the occupancy status of the overflow circuits associated with the different groups of trunk trunk in the office as indicated by lamps 508 for each overflow circuit and observes the number of requests for links. at junctions in groups of junctions where we have encountered waiting. A recording of deferred calls is obtained by the monitoring group using the forms that have been filled in by the operators of the call order table in response to circuit request calls from the various outside long distance operators.

   By noticing the play of the overflow lamps and keeping a record of the cards, a monitoring operator can estimate the

  <Desc / Clms Page number 55>

 approximate length of wait to be expected to establish communications to other long distance offices.



  When the wait is of a given minimum duration, the group of junctions is connected for waiting utterance by connecting a plug of the waiting utterance connection lead 510 to the jack 509 of the associated overflow junctions. to the trunk group and the other plug to jacks 511 of the standby utterance circuit. The wait for this group of junctions is then announced periodically by an operator of the call order table on long distance lines which have been connected to the overflow junctions as will be described below.



   There are a number of type-on-hold utterance circuits (DQCs) shown to the right of FIG. 5 to state different periods of waiting time, such as for example 30, 40, 50 or 60 minutes of waiting to establish communications on trunks of different groups.

   Each on-hold utterance circuit has a set of several 511 jacks in multiple, so that a number of overflow circuits associated with the same group or with different groups of trunks can be connected to it depending on the pattern. delay to be stated for establishing communications to trunks in those particular groups, 511 jacks are arranged in groups on the monitoring panel for the convenience of the monitoring team and 529 jacks for delay uttering circuits, of the call order table, are assigned to specific waiting periods for the convenience of the operators of the call order table. Notices are also placed in suitable places in the work room indicating the groups of junctions involved and the wait to be stated for each group of junctions.

   The displayed expectations can be seen by the operators, both from the table

  <Desc / Clms Page number 56>

 switch to erdre that from the switchboard without cords.



   The wait notice circuit is activated by inserting a plug of the 510 connection cord into the 511 jack, causing the relay to operate.
522 which establishes a circuit for the heater element of tube 514. The other plug of the 510 patch cord is inserted into an overflow jack 509. Subsequent connections can be made from multiple jacks with the jack. Hold utterance 511, to jacks 509 of other overflow junction circuits.

   Plugging the patch cord plug into jack 509 causes relay 541 to operate common to the overflow circuits of a group of junctions and connects relay 540 in the socket circuit passing through resistor 545 and winding of relay 548.



  This circuit is closed by the operation of relay 504 when an incoming trunk line is connected to the overflow junction. The result of the operation of relay 541 will be described after the following description of the standby utterance circuit.



   A calling link connected to an overflow junction which is connected for wait utterance, determines the operation of relay 548 and the operation of relay 548 establishes an obvious circuit for relay 542. Under these conditions, relay 540 does not. not working since this relay is Marginal and resistance 545 is high enough to prevent its operation.



  Relay 542, when operating, establishes the plate battery circuit comprising: the battery, resistor 543, relay 1 contact 542, repeater coil winding (13, and tube plate 514. operation of relay 542 also establishes a circuit, through its contact 3 and the contact of relay 563,

  <Desc / Clms Page number 57>

 to turn on the lamp 547. The operator of the call order switch board operates the conversation key 803 and pushes the plug 600 into the jacks 527 and 529 of the call waiting circuit.

   A circuit is thus established for the socket relay, 562, conoremant: the earth, the lower winding of this relay, the socket of the jack and the plug, the contact 4 of the relay 602, the laripe 609 and the resistor 811 multi @ The operation of the relay 56] turns off the lamp 547. The operation of this conversation key 803 activates the relays 802 and 815 as described above to the earth by the conductor 838 which passes through the contacts of the relay 900 and 943. The telephone circuit relay 901. is now actuated by a circuit comprising: the conductor 839, the contact 2 of the conversation key 803, the contact 7 of the relay 815, the contact 1 of the conversation key. the conversation key, conductor 838 and earth.

   The operation of relay 901 associates the conversation circuit of the telephone set with the call waiting circuit, connects the earth to the relay 900 to actuate this relay and connects the earth to the conductor 832 which returns the earth to the circuit. primitive from contact 2 of relay 943. The announcement of certain waiting times for the establishment of telephone calls on the junctions of this group is then made by the operator.



  Note that the conversation circuit from the operator's position passes through the tip and neck conductors of plug 871 and jack 527 until resistor 528. This arrangement is used to balance the telephone circuit which is arranged for four-wire transmission.

   After the announcement of the wait has been made, the operator of the call order panel operates the key 801 to activate the relay 544. The circuit includes: the battery, the resistor 825

  <Desc / Clms Page number 58>

 connected by all the contacts of key 801, the tip and neck conductors of pin 870 and jack 529, the delay coil 526, will wind it from relay 544 and earth.

   Operation of relay 544 causes relay 548 to operate and connects the battery to earth via a circuit comprising: resistor 456, the socket conductor of patch cord 510, the coil of relay 540, contact 7 of relay 541 and contact 4 of relay 504, which actuates relay 540. 3 @ other overflow control circuits for other groups of junctions are connected to this waiting utterance circuit, all relays similar to relay 540 are actuated at this time. Relay 540 and other similar relays connect the
 EMI58.1
 earth to delay coil) 0J and similar delay coils in all overflow circuits so connected.

   This transmits signals to all
 EMI58.2
 the calling parties connected to this call waiting circuit. The operator of the egg call order panel then repeat the announcement of the wait and operate the key 801 again. The key continues, starting from the call control switch, intermittently.
 EMI58.3
 to give the waiting time to establish a communication. on these junctions and ia operate the key 1101. pou: 'si ;; n' "': 1 or to calling interurban operators of 13. = i = <; r cemmuuication of long distance tables ;; j:; - .. 1: ",,, <#: - #.

   (11. interurban bar office Cr. '? S''E; SL release of all interurban lines connected to, .¯:' ^ ::. I:; C, the overflow causes the relays to release 54 and 54 'which'. Smokes the lamp bJ9 of:,: Jrvei.1L \ r ..; 0 of the cord circuit by a circuit comprising: the. Battery, the resistor .1, 1 ''. The pe to>, 1.j, It con.hI2t (socket ur of the plug / 1 and of the jac ''): - 7, the WINDING \ llCilt 1'pé,

  <Desc / Clms Page number 59>

 
 EMI59.1
 low resistance of relay 562., resistance), S1 and not to applied earth (1) contacts of relay 5: 1 ';': The operator of the 'î.

   J1 '? Ct :. Call Order now knows that all the calling lines that were reread; ', to the standby enunciatian circuit feel detached and she would then have to remove it. plug l?> 'j of the I. ".., ¯, j.1.µ É311:, 29. 1: E: removal 1¯e the plug ûO'J releases the eth63 relays. This operator F'; nO, '}) "1, ..," 1 A 1' "'' c" I 1'- ': J µ: 5. "1" / Ù e .t, 1; e. Oj =;; 1 r: iti: 1 c; can aJ.0-'S in ± 'ic1 :( :: r:', li-, S uu interfere with waiting enoneiation circuit r ") ',: 1Y111Cf: CC.'? ' the tf :: 'lp3 \ 1 f: t (:; nt0: o #> j.:. n:: r the group or groups of junctions which are branched there.



  In the case of S: àX'Ch1, Tjµti of an oJllï; Eii.1 he peu.ty have p: "= L :). Jcc, Ú (" c:.; SlJ0aill 111iC.: ..; teli: :, ...) r; 8 :: ': 1C:.;.: .. r.:\J..c:: J.c.; l '': -: \ n L! ' i c; .. l .. ç :; : l G l ,. ll; C (1 1.-... tt :: 0.. I Û l>., J., (. '. T' - \. ', :: ..' d 1: ¯o> ç, n ' .. the dE: ¯tl of,). i..¯: I'r. '!!, .1 # ..:, .ï'.: W '.' ", .. In C, case v; 1.: t: .l;.: ;;. T ...:; 'l1:.;: "' T: de l C. ¯L! Lt cr; ....]." L..illC ; - ":, 1 = .. i; c1; .llos 'C'L,.: \; C":. T 1' .. F connected to a circuit v ¯; t.: I lJ!! C = ¯ G v.: ¯ O ¯r '?,. (. T; iv W.' 1.; m: j., S "; C 1 ...- bind before the operabric '' is 8'l .. the .1.:. [:; ';:.:') 8 link the cord circuit to it to make an announcement. This, however, is done as quickly as possible in order to avoid 'waiting at the COf tables, 1r-iut1.teurs calling long distance.



  Therefore an a.'1-; 717¯fl.Cltt: ül 'is provided in the standby utterance circuit to function appropriately when a certain number of calling speakers
 EMI59.2
 are linked to it. This amplifier works with
 EMI59.3
 overflow junction circuits cO, ll1J.C ain device
 EMI59.4
 no. It alines a low impedance source to which
 EMI59.5
 can be made simultaneously from 1 to 60 connections
 EMI59.6
 without appreciable change in output level. The volta-
 EMI59.7
 output speech ge it through the 52ú low resistance discharge delay coil will be approximately double the
 EMI59.8
 input voltage.

   The low output impedance, combined with the corrective effects of the feedback, keeps the output voltage substantially constant despite changes in the connected load. The reaction circuit
 EMI59.9
 m

  <Desc / Clms Page number 60>

 passes through capacitor 515, resistors 523 and
 EMI60.1
 516 and the: capacitor 5'21, up to the cathode. A 25 volt DC grid bias current is provided by heater resistor 519.



  Resistor 543 is designed to give a maximum of 110 volts on the slap and screen of the tube.



   Connecting a trunk group to the delayed speaking circuit automatically changes the direction of incoming calls for trunks in that group and puts the trunks in that group under the control of the operations of the order switch board. calls.

   This econo-
 EMI60.2
 set the te?: ln ::, for long distance operators outside, to obtain a telephone call with a trunk of a group since a call to the operator of the call order switchboard is sufficient to obtain this communication when a junction
 EMI60.3
 free is:. (1'i0ï.lL) 1 and also provides a means of establishing communication:

  , on trunks of this group in the order in which the calls were made by the different subscribers of different networks. An exception to this may occur when there is a long
 EMI60.4
 distance an interurban call which can be: urgent and which, .e11 already correspond to the commissioning of an equir2-!. 'E': Yt! expensive long distance, your aopels of this ty;% i 'are <µ, 1 r L,:.; '8.;. : ...: tC) :: G t i (, - c;

   (; r on the operator of the call order table IL instead of J.ft.l..1 .- ', - .: on a Junction; the t, ü 2 ^;.; - i 1. r 'l::.: i a .. y:.; ..- 1 E: i ^. free ei; t 11s} Ji) 11 Lblc; and p .. 'e the established CW the paealt communication guaranteed to the operator of the order table' .llcùjClc :, he may have the preeminence .. # over other :; calls waiting.



  D. <Vlfil "1'¯> 11 A1Jrr:.) 'D.'U' 1.1uT =; L; l'J1Jl (Dus).,;,, Y¯ 1.;) I.



  , '1 \ .Jj <; "; I '' '\. L1Ji'. DfA'1Hl'1 '/ î.



  The operation of the relay) it as here described CI'1 r <1 .: <>: r <; to 1 T înr) dLa, ^. t LOrl of the cord plug

  <Desc / Clms Page number 61>

 connection 510 in the overflow jack 509 connects earth to conductor 578, which, as will be shown in the following, will activate the marker mechanism to indicate that all the junctions are occupied when a call is made for a trunk of this group by an outside trunk operator, even though there may be free trunks in the group at this time. These free trunks, as said previously, are now only available to the operator of the call order table.

   It will be recalled from the previous description of a long distance call to a trunk of a group not connected for the standby saying that when all the trunks of the group are busy, relay 555 is released and thus a circuit is established comprising : the 48-volt battery, contact 5 of relay 541 at rest, the winding of relay 308 and 304 and the 24-volt battery. This operated relay 304 but did not operate bias relay 302 and in response to operation of relay 30 the calling line was directed to an overflow junction.

   A group of junctions being; in standby utterance and relay 541 actuated, the circuit passes through conductor 378 from earth through the winding of relays 308 and 304 and goes to the 24 volt battery, which actuates both relay since current flow is in the correct direction to actuate bias relay 308 as well as relay 304 when feeder relay 310 is operating in response to code registration for that group.



   In all circumstances the code is registered by the marker in the usual way in response to a call from a trunk switchboard operator
C.L.R. on a short trunk line, originating from a distant trunk operator on a trunk line.

  <Desc / Clms Page number 62>

 ne long, or coming from an interurban operator without cords from the interurban crossbar office.
 EMI62.1
 CALL ON SHORT INTERURBAN LIGKL Î5ilÎ.I.



   ---------------------------------------------
A call from an interurban operator
CLR operates the feeder relay of the regular trunk group, such as feeder relay 310, in the usual way, and when the feeder relay closes its contact 1, a circuit is established for relays 308 and 304. and a circuit is established for relay 406 by its contact 2. As previously followed, relay 304 actuates relay 401 and the resulting effect for
 EMI62.2
 the test relays immediately activate the overflow control relay Leu2 which directs the calling line to an overflow junction if one is free.



  The long distance operator C.L.R. calling party then hears the announcement of a certain waiting time as made by the operator of the call order table by the waiting utterance circuit as explained. The op-
 EMI62.3
 outside ratrice of the C.L.I interurban switchboard =. detaches from the long distance bar office c2o.i; ecs f and this attendant or other special attendant makes a call
 EMI62.4
 circuit request to the operator of the long distance office call order table with crossed bars.

   The co :::: unicatior. long distance is then established, CORIT18 described below, by the operator of the call order table.
 EMI62.5
 hr .-. L S1.:H UL, LIC1; : Li.TRURD - !; l '; L L0i'. (Il.>]] PR3VLHANT b "" 1: ± liiliJ'i, 1 Cï.'J'Iii.lili3l.iï 1L0Tfadl in response to a call from 'a remote inter-urban office on an inter-city line which may
 EMI62.6
 terminate in the long distance office, with cross bars on the incoming trunk circuit, Fig. 6, a junction indication is signaled, from the junction to the record.
 EMI62.7
 sender ô3u registers and transferred to marker Á 700.

   The

  <Desc / Clms Page number 63>

 result of this signal as shown schematically in the marker, Fig. 3, establish a circuit through conductor 351, which operates what is known as the intermediate only relay 317. The code for this trunk group is registered and actuates the trunk relay of the regular trunk group such as the relay switch 310, which causes relays 304 and 308 to operate.

   Relay 308 now actuates relay 316, which in this case actuates relay 319 via a circuit comprising: earth, contact of only intermediate relay 317, contact of relay 316, winding of relay 319 and the. battery, Relay 319 opens the control circuit of the regular feeder relay 310 and establishes a circuit for the feeder relay 312 of trunk group 151. The regular group feeder relay 310 drops out immediately and therefore drops out immediately. the marker does not try the group junctions or the overflow e-junctions associated with this group.



   The group 151 feeder relay is actuated in a circuit comprising: earth, contact 3 of relay 319, contact 2 of relay 318, contact of relay 313, contact of key 550, relay winding route 312 and the battery. The special junction 151 is shown in FIG. 7A as previously described and operation of feeder relay 312 151 causes a particular terminal block relay to operate to associate a group of special junctions of the type shown in FIG. 7A, to the test equipment shown in FIG. 4.

   Its junctions are tried by the same marker as the junctions described previously and when a free junction is found the sensing magnet connected to the crossbar switch of junction 151 is actuated and, as previously described , relay 728 is actuated

  <Desc / Clms Page number 64>

 for the seizure of this free junction. The trunk circuits established are the same as described for a circuit request call on the incoming trunk, Fig. 6, where the calling operator numbered the special call 151 in order to connect to this trunk 151.

   In the present case, however, it is believed that it is clear that the remote toll operator numbered the code of a trunk which was on hold utterance and in order to facilitate such links, the calling operator is automatically connected to a junction 151, Fig.

   7A, to immediately reach the operator of the call order table instead of allowing the disconnection of this line and a new connection to obtain access to the operator of the call order table, as described in section the subject of a call from a local trunk board on a short trunk line.

   The lal junction, Fig. is connected to the recorder-sender by the calling incoming junction relays such as 609 and 615 by the operation of the crossbar switches, and in response, the relay 712 is actuated as soon as the recorder-sender is aware of this connection with the circuit of the special junction 151. The relays 609 and 615 are then released in the manner described previously and the lamp 733 is lit in front of the operator of the call order table to indicate an incoming call. on this junction.

   The card 800 is then inserted into the jacks 723 and 724 and the incoming call is answered by the operator of the call order table as described.



     At this stage the action of the operator of the table, order of calls will depend, to a considerable extent, on the nature of the incoming call and in some cases on her knowledge of the length of the trunk line which has already been established from some distant point. In one

  <Desc / Clms Page number 65>

 In the event that the busy trunk group is heavily loaded with incoming calls, the operator will fill out a usual form and inform the remote toll operator that a connection will be established for her as far as possible.

   In another case, interurban communication can be established as soon as a free link is noted by the operator of the call order table, the connection to the remote operator being maintained in the meantime. this free junction. This communication is then established on a circuit leaving from the remote operator via the circuit of the incoming junction, Fig. 6, the circuit of junction 151. FIG. 7A, the cord circuit from the call control panel, to an outgoing free junction of the desired group, by inserting a plug 820 into a known junction shown in FIG. 20.

   To establish this communication, the operator of the call order table produces the code of the outgoing trunk trunk on the keys shown in Fig. 11 after first making sure that the recorder-sender has been associated with them. This communication was thus established as described below by two sets of cross-bar switches, one set as shown in FIG. 7 and the other set as shown in FIG. 21, instead of the usual communication which is established only by a set of cross-bar switches. Before establishing the interurban communication to the outside via the junctions Figs. 20 and 22, a further description will be given of the features relating to the automatic steering in the marker.



     WAITING STATEMENT BY TA- OPERATRICLS
 EMI65.1
 BLUE C0l3'lijTl.1 "Eô" .R SAKS C, ilî0iv ;.



  -----------------------------------------------
There are circumstances in which the call order table is not occupied by attendants. On these occasions the operators of the switchboard without cables may be called upon to state expectations for

  <Desc / Clms Page number 66>

 all types of incoming long distance lines and for establishing delayed communications.



   Under normal circumstances the cardoonless operator only sets out expectations for operators making incoming calls on long distance lines with calling on auxiliary lines with automatic listening on the incoming operator and on calls. long distance lines with call on the circuits, both of which can be used by long distance operators without cords for the establishment of long distance calls, or else, a form is filled out and sent to the call order table .

   All calls originating from long distance offices employing trunks with calls on the auxiliary lines with automatic listening on the incoming operator or with call on the circuits and following in the long distance office with crossed bars, are linked. by coupling to the positions of interurban operators without cords.



  It has been explained that each cordless operator position has associated with it a recorder-sender and a keypad to operate this recorder-sender. After the association to a position without cords of a trunk line with call on the auxiliary lines and automatic listening on the incoming operator or with call on the circuits, the operator without cords finds the direction of the call and operates its keypad accordingly to set the recorders of the recorder-sender to the position for the code of a trunk-outgoing trunk or a trunk to the outgoing establishment according to what is requested.

   Category signals are transmitted from the incoming trunk directly to the recorder-sender through the link switches indicating to the recorder-

  <Desc / Clms Page number 67>

 sender the type of an inbound trunk that is linked to it. After the complete setting of the recorder-sender, the information concerning the junction and registration of the code is transferred from the recorder-sender to a chosen marker. The marker chooses an outgoing junction to a long distance office remote from the type requested or an outgoing establishment junction to a local office, according to the code recorded in the marker, and associates this junction with the incoming junction by means of crossbar switches .

   In most cases the universal type of recorder-sender is necessary for each position without cords since a call arriving at a junction with a call on the auxiliary lines and automatic listening of the attendant arrival, or a junction with call on the circuits can be connected to an office having recorders-senders with recorders to be regulated by pulses of alternating current. The recorders-senders of other offices to which these junctions can be connected will be regulated by pulses of direct current. There is a considerable difference in the operation of the recorder-sender and the marker for linking to AC desktops or to DC desktops, as will be described later.



   Under the normal operating circumstances of the switchboard without cords, waits in the communications establishment when trunk groups are busy are announced to the calling long distance operators by the operators without cords since these operators have access to the bulletins covering the network. waiting on the trunk groups. When there is a considerable wait and the call order table is at this time occupied by a complement of operators,

  <Desc / Clms Page number 68>

 the operator without cords can fill in a form which is sent to an operator in the call order table and the operator in the call order table establishes the communication accordingly when a trunk is available for this communication.

   If, however, the call order switch panel is not occupied at this time by operators, these deferred communications are established by special operators of the switch panel without cords set up for this type of service. Likewise, when the call order switchboard is not occupied by attendants and a remote attendant makes a circuit request call, after finding the busy junctions, this call is automatically directed to an attendant without cords instead of being automatically directed to the call order table.



  * Under the conditions to be described, it will be assumed that an interurban operator, either of a CLR interurban switchboard, or of a remote interurban office, has recorded the code of a particular group of junctions and that all the junctions of this group are busy, that therefore the incoming trunk was routed to either an overflow trunk or a main busy trunk as described. here and that the long distance operator then made a circuit request call, known here without the call name 151, and that at this time the call order table is not occupied by a supplement operators. In this case, the key 550 of the call order switch panel is actuated.

   A call of this type shown in Figs. 12, 13 and 14 and also shown in Figs. 1D and 2G (LK designating a coupling, incoming / outgoing SDE) a recorder-sender, MKR a marker, IT the junction /
Fig. 12 illustrates the original long distance office 1200 and the incoming trunk circuit 1201 which responds when the original long distance caller initiates

  <Desc / Clms Page number 69>

   the call . In response to the activation of the incoming trunk, a coupling 1228 is actuated which associates the registrar-sender 1211 with the incoming trunk and the code 151 is translated in the registers of the record.
 EMI69.1
 ristror-sender.

   This code along with other information from the trunk circuit is transferred to marker 1212 which now operates to handle it. described in Figs. 3 and 4. Code 151 is recorded in recorder relays 325 and in this case it tries to actuate feeder relay 151. In this case, with key 500 being actuated, the circuit: coming from the relays recorder now extends to feeder relay 311 to choose (TC.121T conductors) a junction as shown in Fig. 13.

   A group of these trunks are therefore tried by the marker in the manner previously described and a free trunk '121 is chosen to direct this anpel to a cordless operator instead of directing the call to the switchboard operator. order of calls. Since the cordless switchboard does not employ cords and plugs, the junction 121 arrangement, FIG. 13, is necessarily different in that it must actuate a coupling to choose a channel to an operator position without cords. Junction 121 is actuated by the marker substantially in the manner previously described for outgoing junctions. When the marker chooses this free junction, it associates the earth with the conductor 1225 to activate the relay 1319.

   Conductor 1225 has been previously tested by the marker and it is seen that it extends through the terminal block relay, through conductor 1226, to the marker. The crossbar switches 1207, 1208, 1209 and 1210 are then actuated, which associates the junction 121, FIG. 13, to recorder-sender 1211.

   If the call pro-

  <Desc / Clms Page number 70>

 came from a long junction, relay 1314 is actuated by the marker by a circuit passing through the recorder-sender, the incoming junction and the cross-bar switches, this circuit including earth, contact 1 of relay 1319, l lower winding and contact 2 of relay 1314, contact 1 of relay 318, upper and lower windings of relay 1301, upper and lower windings of coil 1303, contacts 1 and 5 of relay 1309, conductors 1221 and 1222, the crossbar switches, recorder-sender and marker, where a battery is applied to this circuit from a relay which responded to the indication from junction 1201 that a long junction is connected to it .

   After performing the functions of the marker and indicating thereby to the recorder-sender 1211, a low resistance ground is connected by the recorder-sender to the conductor 1223 and to the conductor 1224 causing the operation of the relay 1318. Relay 1318 is blocked to earth by a circuit comprising: contact 2 of relay 1319, resistor 1317, contact 4 of relay 1318 and contact 1 of relay 1319. Relay 1318 (when operating, opens its control circuit. command, which transmits a signal to the recorder-sender, meaning that the outgoing junction no longer relies on the recorder-sender for its operation. The operation of relay 1318 also establishes a circuit to activate coupling 1320.

   This circuit includes: earth, relay contact 3 1318, relay contact 1301, relay contact 1 1313, lead 1350, coupling start relay winding (not shown), and battery. The coupling includes a mechanism to test the different pathways entering the operator positions without cords and chooses a free path. Coupling switches are then actuated,

  <Desc / Clms Page number 71>

 which connect this path to conductors 1350 to 1364 shown between the junction circuit and the coupling.



  Most of these conductors are connected by switch contacts to the operator's position without cords for control and signaling purposes. A signaling lamp is lit at the entrance of the cordless operator and an automatic control mechanism associates the telephone machine of the cordless operator with the incoming calling line. The junction relay 1313 is likewise energized by the conductor 1351, which relay is blocked to the earth applied to a conductor 1353 connected thereto by the mechanism for automatic control of the position of the operator without leads.



   The calling operator of the long distance office 1200 is now part by the four-wire route comprising the conductors 1354, 1355, 1356 and 1357 which are associated with the telephone circuit of the operator without cords and indicates to this operator that she wishes to make a call. circuit request call for the establishment of a telephone circuit on junctions it has found busy. In response, the Cordless Oderatrix will, if necessary, warn her that there is a considerable delay on this group of junctions.

   In other circumstances, when no waiting bulletin has been made for this group of trunks, the cordless operator may try to establish communication right away. 'cordless operator in position 1408 operates her keyboard to adjust the loggers of the nosition 1409 sender-recorder' In response to the adjustment of this logger, a marker 1410 tries the outgoing trunks of the group of outgoing trunks desired in the same way here described. If a free junction is found, the marker then activates

  <Desc / Clms Page number 72>

 the cross-bar switches 1402, 1403, 1404 and 1405, which connects the free outgoing junction 1406 to the junction 121, FIG. 13.

   This outgoing junction can be of various types but it can be assumed that it is of the type shown in FIG. 22. After performing its functions, the marker may return to idle, but registrar-send 1409 may have other functions to perform. The 1409 recorder-sender digital recorders may have been set by the operator without leads and relay 1310 may have been actuated by the position circuit's automatic control mechanism.

   Thus, communication is established from recorder-sender 1409 through the coupling switches, conductors 1358, 1359, 1360 and 1361, crossbar switches and outgoing trunk 1406, to remote office 1407. Recorder-sender 1409 thus operates to set up the recorder-sender registers in office 1407, whereupon relay 1310 drops out and the recorder-sender can be disengaged.

   Therefore, in this case, the circuit request call produced an established connection to the desired long distance office since at the time the circuit request was made a free trunk was found by the operator without cords, cE: group having seemed busy when the original call was made. Releasing relay 1310 associates the mechanism of desk 1407 with desk 1200 and in this case the telephone communication is established by two sets of cross-bar switches instead of one set of cross-bar switches which is the usual process when a free trunk is available when the incoming call is made.



   The call described above, with interurban office 1200 connected to incoming trunk 120, would be

  <Desc / Clms Page number 73>

 directed to junction "151" 1206 if the call board is occupied by an additional operator ;; and if the key 550 is normal as shown. Thus this call ends in jacks 1400 and 1401 in an operator position of the call order table and would be answered by the insertion of a plug of the lead circuit, FIG. 8, into the jacks above, in a manner described herein, instead of being directed to junction 121 and the operator from the cordless position.



   ARRIVAL CALL ON A JUNCTION WITH CALL ON THE
CIRCUITS ----------------------------------------------
A mechanism is included in the marker, Fig. 3, to direct an incoming call from junction c with call on circuits to a main busy junction if the desired junction direction is connected for hold utterance and the operator without cords tried to 'establish a telephone call to this busy junction direction.

   Assuming in this case that the wait for this group has not been displayed, the attendant without cords, after receiving a call from a remote attendant on a trunk line with call on the circuits, maneuver - would have his keys to adjust the code recorders of the position recorder-sender. In this case, the position mechanism would have received an indication of the junction which would have actuated the relay 317 and also the marker relay 313 when the marker is connected to it and the code record is transferred from the recorder-sender. to the marker.

   It can be assumed again, for example, that a feeder relay such as relay 310 is actuated in response to registration in the marker and since the desired trunk group according to the registered code is wired for. standby statement, a circuit is established including relay contact 1

  <Desc / Clms Page number 74>

 feeder 310 to actuate relays 308 and 304. Relay 308, while operating, establishes a circuit for relay 316. Since at this time the relays 313 and 317 are actuated, a circuit is established for the relay 319 by the Through relay contact 2 316 and relay contact 317 to ground, and therefore a circuit is established for the main busy direction feeder relay 309.

   The circuit for the main busy direction feeder relay includes: ground, relay 319 contact 3, relay 318 contact 2, relay 313 contact, feeder relay winding d main occupation 309, the winding of the relay 314 and the battery. Relay 314 is marginal- and does not work.

   As previously described, the operation of relay 319 opens the control circuit for feeder relay 310 of the regular group which releases this relay. As a consequence of the previous operations the trunk trunk with calling on the calling circuits is immediately directed to the main busy trunk to warn the calling operator that a considerable wait has been encountered in establishing communications to this group of junctions.
 EMI74.1
 



  CQI ... fl.CiiTc¯àTI31,1 FROM TABLE 3Al'i3 CORDS TO TABL., -, A77 OF CALL ORDER.



  -----------------------------------------------
The calling operator can then disconnect and make a circuit request call on a junction 151 to the operator without cords, requesting that this operator connect it to the call order table or fill out a form for a deferred call. and passes this card to the operator of the call order table.

   The way this last call looks is shown in Fig. 14 B and the operator of the long distance office 1450 puts into service

  <Desc / Clms Page number 75>

 the incoming junction 1451 which causes a coupling to connect an operator position without cords, passing through the junction to the long distance operator of the 1450 long distance office. The request is then made by the calling long distance operator of the 1450 office, di - if she has an urgent telephone call and that she: needs to be connected immediately to the operator waiting for the call order table:

     Cordless attendant 1460 can then operate her keypad to set the recorders of recorder-sender 1461 to position, for a call 151. This call is transferred to marker 1462 and a trunk "151" 1456 as shown in. Fig. 7A, is chosen by the marker. This junction ending in a jack is then connected by crossbar switches 1452, 1453, 1454 and 1455 and from there by the incoming junction, to the calling long distance operator, under the control of the marker and the registrar. - treur-sender of the position.

   After the operator answers the call order table by inserting the cord, Fig. 8, in jacks 1457 and 1458 of her COBD board, the original operator of the interurban office 1450 sends her request to the operator of the call order board, asking that if possible, the communication be established at that time, and, if that is not possible, to arrange for them to communicate with the desired long distance office as soon as possible.



   If it is necessary for a call order table operator to establish this communication later, she then writes the information on a call order card so as to move to establish communication to the desired office and to the original operator as soon as possible.

  <Desc / Clms Page number 76>

 



  INTERURBAN
 EMI76.1
 ESTABLISHMENT: EM D'UNL C> Jl.ùlUl.lîCÀTI011 / FROM TABLE COl '"ú.'UT il TE1JR ORDER OF APPEALS.



   ---------------------------------------------
In the foregoing description, it has been said that the junctions of a trunk group branched for waiting utterance are not available to outside long distance operators by registering the code of regular trunks and operating. of the corresponding feeder relay, since the operation of this regular feeder relay immediately activates other relays including the 30h relays.

   and 308 which prevent the testing of the trunks of this group and the direction of an incoming long distance call on a trunk of this group. It has also been said that the trunks of the group or groups connected for hold utterance are now put. available to the operators of the call order table to set up deferred communications, in the order in which the requests were received. Special junctions as shown in Fig. 20, (ST) terminating in twin jacks of the call order switch board, are used by the operators to establish communications on junctions which are connected for such control by the call order office. 'anpels.

   The operator of the call order panel, after observing the existence of a free junction in a connected group, puts a junction into service, Fig. 20, inserting the twin plugs of the cord circuit, Fig. 8, in jacks 2025 and 2026 which constitutes the beginning of a series of functions which will be described in detail later. This series of functions includes the commissioning of a coupling, the selection of a recorder-sender by the coupling and the binding of the junction, Fig. 20, at
 EMI76.2
 the register = istreur-sender chosen entered by the establishment

  <Desc / Clms Page number 77>

 The connection of circuits between the junction and the recorder-sender mechanism is also followed by the transmission of code pulses for the selection of a junction from the group of connected junctions.

   These code pulses are transmitted by maneuvering keys from the position of the call order table, to set the recorders of the recorder-sender. One of the circuits established between the junction, Fig. 20, and the recorder-sender, causes a call order relay to operate in the recorder-sender which connects ground to a call-order conductor. A connector is then chosen between the recorder-sender and a free marker and this grounded call order conductor is connected to the winding of a call order relay of the marker at substantially the same time. where the code record is transferred from the recorder-sender recorder relays to the marker recorders and as shown schematically in Fig. 3.



  The marker call order relay designated as relay 307 may actuate a fraction of a second before the route relay which operates in response to the code stored in the marker. Relay 307 opens the circuit extending from the earth applied to relay 541 passing through conductor 578 and contact 1 of the feeder relay, a circuit which, if established, would have determined the operation of the cables. relays 304 and 308.

   The normal feeder relay functions for this group of junctions are thus re-established since they are not changed at this time by the operation of relay 304 or relays 308. A free junction from this group is now chosen. in the manner previously described, by the operation of a terminal block relay which connects the junctions of a group to the test relays, FIG. 4. This free junction, which can be an outgoing trunk junction,

  <Desc / Clms Page number 78>

 as shown in Fig- 22, is connected by crossbar switches under the control of the marker, at the junction, Fig. 20 and to the cord circuit of the call control panel, Fig.

     8. The other end of the corded circuit may already have been connected to an interurban trunk line, as would be the case in response to an anpel from a distant attendant, through a junction 151 Fig. 7A to the call order switch table, as described above. However, the operator of the call order table can be asked to establish a communication as described above and also to establish a communication to the originating operator when a trunk free is available as will now be described together with a detailed description of the recorder-sender, FIG. 23 to 35.



   RECORDER-SENDERS As an example of starting up the operation of the recorder-sender shown in Figs. 23 to 35 inclusive, a link will be established between the cord circuit of the operator position of the call order board, shown in FIG. 8 and the junction circuit shown in FIG. 20. The description of the recorder-sender, however, will include features responding to other types of trunk circuits and differences in the control for which the recorder is arranged.

   The office 2230 to which the junction will be connected, Fig. 20, by the choice of a junction, Fig. 22, it may be assumed for one example to have recorder-senders responding to alternating current pulses and for another example to have recorder-senders responding to direct current pulses.

   The recorder-sender, Fig. 23 to 35, can have its recorders regulated, either by pulses of alternating current or by pulses of direct current, and may also trans-

  <Desc / Clms Page number 79>

 put alternating current pulses or direct current pulses to tune loggers in a desktop logger-sender. hen the recorders of a recorder-sender in another office are controlled by alternating current pulses, these pulses are transmitted directly from the recorder-sender, Fig.

   23 to 35, to the recorder-transmitter of the connected office. When the recorder-sender of the connected office requires direct current pulses for the adjustment of its recorders, the use of an outgoing recorder-sender is required in combination with a recorder-sender as shown in Figs. 23 to 35. When an outgoing recorder-sender is needed it is attached to the outgoing trunk circuit under the control of the parking lot. This outgoing recorder-sender is chosen by the trunk circuit. DC recordings are performed first in the recorder-sender, Figs. 23-35, and transferred to the outgoing recorder-sender after attaching this recorder-sender to the trunk.

   This allows the recorder-sender, Figs. 23 to 35, to return to idle and allows the outgoing recorder-sender to transmit the pulses after the linked office has been entered. The method of making recordings in the recorder-sender, Fig. 23 to 35 either by pulses of direct current, or by pulses of alternating current, and the method of transmission, either of pulses of direct current or of pulses of alternating current, from the recorder-sender, Fig. 23 to 35, is according to the following description.



   The interurban operator keypad circuit of the call order table, Fig. 11, and the multi-frequency generator apparatus, FIG. 15, can be

  <Desc / Clms Page number 80>

 considered to be substantially the same as at the position of an outside interurban operator of a CLR interurban office connected by interurban lines to this interurban office, or to an outside interurban operator position, transmitting pulses by key, from a remote long distance telephone office, at least as far as this concerns the operation of the recorder-sender.

   This will help to understand the connections as shown in other figures of the drawings, where a schematic representation of the registrar-sender has been made. The cooperative action between the junction Fig. 20, and the recorder-sender is the same in general terms as between the incoming junction, Fig. 6, and this recorder-sender shown schematically as recorder-sender 636 insofar as it is recording of alternating current pulses.



   The insertion, by the toll operator of the call order board, of a corded circuit plug $ OR or 820 in the junction circuit jacks 2025 and 2026, causes the establishment of a circuit between the bat - leads the circuit with bead and earth by breaking through the lower winding of relay 2000. Relay 2000, while operating, establishes a control circuit for relay 2020, which is blocked by its contact 1 at the earth applied to the contact of relay 2000. The 2U20 relay, while operating, establishes a coupling start circuit by connecting the earth of contact 5 of relay 2021 to the coupling start conductor 2040. The other links established by the 2020 relay will be described in the order of their use.

   Other types of the trunk circuit in the long distance telephone office, a few of which have been shown, have a relay similar to the 2020 relay to activate the start circuit.

  <Desc / Clms Page number 81>

 coupling route when the services of a coupling are required.



   In general, the couplings discussed here work as follows. The conductors coming from several junction circuits such as the junction circuit shown in FIG. 20 are connected to primary switches of the coupling. Several recorder-senders are connected to the contacts of secondary switches associated with the primary coupler switches. The junctions connected to the primary side of the switch are in groups and therefore when a trunk circuit has established a link with a coupling serving its group, the remaining trunk circuits cannot at this time establish a link with that coupling.

   Arrangements are made, however, so that all of the junction circuits can immediately establish coupling connections, each on its own. The aforementioned start-up circuit established by the junction circuit goes to a so-called coupling connector so that the junction is not only connected to the primary side of a switch but is also connected to a coupling connector for obtaining the services of a coupling control circuit. This coupling control circuit immediately tries all available logger-senders to find a free logger-sender for use by the junction circuit.



  When the free sender recorder is turned on, the coupling control circuit energizes the selector magnets and holding magnets associated with the primary coupling switch and a particular secondary coupling switch to which this logger. -free sender is connected. The operation of this secondary coupling switch and the primary coupling switch connects

  <Desc / Clms Page number 82>

 thus the recorder-sender free to the junction circuit.



   During the test of logger-senders by the coupling control circuit, a free logger-sender can be recognized by the presence of earth on the 2450 conductor which as has been noted extends, because the contacts of the relays 2611 and 2612, Elis and conductor 2650, to earth applied to contact 8 of relay 2422.

   The coulae control circuit also tests the battery on conductor 2451- This battery is shown connected to contact 1 of relay 2422. We see that conductor 2450 extends through the contacts of three relays and that conductor 2451 extends through the contact of a relay, which relays are the last to drop when the recorder has finished a service connection and becomes free. The battery and the earth extend to the commando circuit of the coupling therein energizing mechanisms which cause the operation of the selection magnets and of the holding magnets of the coupling switches to connect the junction circuit to the recorder-sender .

   The operation of the coupling switches connects the earth of the coupling control circuit to the. battery, passing through the contacts of the primary and secondary coupling switches, the conductor 2452, the winding of the relay 2422 and the resistor 2400, which actuates the relay 2422. Operation of the relay 2422 removes the battery from relay 2451 and removes ground from relay 2450 so that this logger-sender no longer appears as a free logger-sender to any of the coupling control circuits trying to find a free logger.



   Linking the conductors from the junction to the logger-sender establishes a circuit for relay 2403. The circuit for relay 2403 includes:

  <Desc / Clms Page number 83>

 earth applied to contact 2 of relay 2401 which is normal, resistor 2413, upper and lower windings of relay 2403, conductor 2760, contact 1 of relay 2708, conductor 2460, contact 3 of relay 2422, conductor 2454 , The winding of the relay 2018 of the junction circuit and the battery. The high resistance of the two windings of the relay 2403 prevents the operation of the relay 2018.

   Relay 2403 operates and in doing so establishes a circuit for relay 2402 from the earth ground to contact 2 of relay 2509 which is connected, through the coil of relay 2402, to the battery. The operation of relay 2402 establishes by its contact 2 the new control earth for relay 2403 and establishes a control circuit for relay 2401. Circuits are also established at this time for extra-normal relay 3000 and the relay. extra-normal 2502. The circuit for relay 2502 includes: the battery, the winding of this relay and the earth applied to contact 1 of relay 2402.

   The circuit for relay 3000 consists of the battery, the winding of this relay and the earth applied to contact 3 of relay 2402.



   The counting circuit, Fig. 23, is activated as soon as the recorder-sender begins to perform these functions in such an order that these functions are established in a counting interval increased by the tolerances which are calculated for any eventuality during the correct operation of the device. The recorder-sender. This counting circuit is put into service by the earth connected by contact 6 of relay 2422, switch contact 2304 and up to the windings of relays 2301 and 2302 which come on and drop off while the switch is turned. 2303.



  This counting circuit will be described in detail later. Relay 2613 is actuated by relay 2422, whose cir-

  <Desc / Clms Page number 84>

 baked includes: battery, coil of relay 2513, conductor contact 2 of relay 2707, conductor 2463, contact 4 of relay 2422, conductor 2453, and ground applied to contact 3 of relay 2018.



  Relay 2422 also connects the 24 volt battery to the windings of relays 2408 and 2409 which are selectively actuated depending on the category of information transmitted from the junction circuit. This information is transmitted from the junction circuit through conductors 2350 and 2353, resistors 2720 and 2721, conductors 2465 and 2466, the windings of relays 2404, 2406 and 2408, to the battery and relays 2405 ù 2407 and 24.09 to the battery on contacts 9 and 10 of relay 2422. Note that the earth of contact 4 of relay 2022 is connected to conductor 2353 and that conductor 2350 is open.

   Before ending the functions of relay 242, it will be shown that this relay provides a control circuit for relay 2021 in the junction which goes from the battery to the earth by borrowing the winding of the relay 2021, the conductor 2455, the contact 2 of relay 2422 and contact 5 of relay 2402. We will also show that relay 2422 obtains a circuit:

  blocking occurring because the contacts of relays 2613 and 2611 immediately follow the closing of the coupling switch contacts and the operation of relay 2422. This blocking circuit comprises the battery, the winding and contact 5 of the relay 2400, conductor 2480, contact 2 of relay 2611, contact 3 of relay 2613, conductor 2653 and earth applied to contact 4 of relay 2402.



  Operation of relay 2611 results from a trunk signal between the trunk and the recorder-sender for indication of the category of the calling trunk.



    'ornme said above, conductors 2350 and 2353, mounted

  <Desc / Clms Page number 85>

 between the junction circuit and the recorder-sender, passed through the windings 2408 and 2409. The junction circuit, FIG. 20, applies a ground to conductor 2353 and conductor 2350 is open. These conductors are, however, employed by other types of jumpers for different signals as will be explained below. Earth applied to conductor 2353 operates relay 2408 and relay 2408 operates AC category relay 3304 which locks to earth applied to contact 11 of relay 2422.

   Relay 3304, in operation, establishes a circuit for relay 2611 comprising: earth applied to contact 5 of relay 3305, contact 5 of relay 3304, conductor 2666, coil of relay 2611 and battery, for actuate relay 2611 and provide the circuit previously followed for latching relay 2422. An earth applied to conductor 2350 would actuate relay 2409 which would actuate category relay 3305 for dc pulses.



   JUNCTION CIRCUIT SIGNALS --------------------------------
As indicated above the relays 2404 to 2409 inclusive are arranged to be actuated) in different ways depending on the type of junction associated with the recorder-sender and the type of pulses transmitted on the conductors of the junction to set the recorders- of the recorder-sender. From the table below it will be seen that the relays 2408 and 2409 are actuated when a circuit is established by the junction conductor passing through their windings. Relays 2406 and 2407 are marginal and operate to zero ohm ground but not when a 300 ohm resistor is inserted into the circuit.

   Relays 2404 and 2405 are polarized relays and operate only when the

  <Desc / Clms Page number 86>

 48 volt battery is connected by the junction to the conductor passing through their respective windings to the 24 volt battery on contacts 9 and 10 of relay 2400.

   Information for a marker, chosen later, is also derived from the operation of the above relays, since, as explained previously, a marker needs a signal from the recorder-sender to direct the signal. selecting an outgoing recorder-sender and linking that outgoing recorder-sender to the outgoing junction when necessary to establish a DC pulse telephone communication.
 EMI86.1
 



  SIGNALS DL cm ,; M: DE D'Iî, ôFUL, SI01 ': S --------------------------------
 EMI86.2
 
 <tb> Driver <SEP> 2353 <SEP> Driver <SEP> 2350 <SEP> Relay <SEP> activated: <SEP> Link <SEP>. <SEP> Type <SEP>
 <tb>
 <tb>: <SEP>: <SEP>: <SEP>: Impulse <SEP>
 <tb>: <SEP>: <SEP>: <SEP>: <SEP> sion
 <tb>
 
 EMI86.3
 Earth 0 ohm open (2406-240: interinterur-:
 EMI86.4
 
 <tb> {2406-2408} <SEP>: baths <SEP> C.A.
 <tb>
 <tb>
 <tb>



  : interurban <SEP>: <SEP>
 <tb>
 <tb>: or <SEP> of establishment:
 <tb>
 <tb>
 <tb>: sement
 <tb>
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 <tb> Earth <SEP> 300 <SEP> ohms <SEP>. <SEP> id. <SEP> 2408-3304 <SEP>: inter-interur-:
 <tb>
 <tb>
 <tb>: baines <SEP> C.A.
 <tb>
 
 EMI86.5
 



  Battery lia v. id. (2404-2408t long distance
 EMI86.6
 
 <tb> 300 <SEP> ohms <SEP> {2404-2408} <SEP>: to establish- <SEP>. <SEP> C. <SEP> A.
 <tb>
 <tb>
 <tb>
 <tb>



  :is lying
 <tb>
 <tb>
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 <tb>
 <tb> Open <SEP> Earth <SEP> 0 <SEP> ohm <SEP> {2407-2409} <SEP>: inter-interur-: <SEP> C. <SEP> C.
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  {2407-2409} <SEP>: baths
 <tb>
 <tb>
 <tb>: long distance <SEP>: <SEP>
 <tb>
 <tb>: or <SEP> establish-
 <tb>
 <tb> lying
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 EMI86.7
 id. Earth 300 ohms. 2409-3305: Tnter-interur-: C.C.
 EMI86.8
 
 <tb>: baines
 <tb>
 
 EMI86.9
 id. Battery tu8 v. 24-2105: long distance: C.C.
 EMI86.10
 
 <tb> 300 <SEP> ohms <SEP> {2409-2405} <SEP>: <SEP> of establishment: <SEP>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>:

    <SEP> lie <SEP>
 <tb>
 
Other trunk signals are transmitted by conductor 2352 as follows, to indicate the type of incoming trunk used for the call as well as for

  <Desc / Clms Page number 87>

 guide the recorder-sender and the selected marker in their operation, such as, for example, the selection of repeaters for communication if the outgoing trunk chosen by the marker indicates that a repeater is needed. The selection of a particular type of outgoing trunk is directed by the code that is stored in the recorder-sender and tag.



   The junction circuit, Fig. 20, is arranged to connect the earth to the recorder by borrowing contact 1 of relay 2022, a 2400 ohm resistor 2023, conductor 2352 and the coupling switches.



  In the recorder this conductor is extended by the contact of relay 2700, contact 4 of relay 2706, conductor 2769, the winding of relay 2604, the winding of relay 2605, the lower winding of the relay 2511 up to the battery. Relays 2604 and 2511 are marginally actuatable and do not operate in series with the 2400 ohm resistor in the junction circuit and therefore relay 2605 is the only relay to operate in this circuit - Operation of relay 2605 establishes a Obvious circuit for relay 2606 which is blocked to earth applied to contact 3 of relay 2502.

   As will be shown in the following, operation of relay 2606 sends a signal to a selected marker indicating a characteristic of the calling trunk.



   Other incoming junctions indicate a different charac- teristic to the recorder-sender and to the marker, the differentiation of indications by the 2352 driver being established as follows:

  <Desc / Clms Page number 88>

 
 EMI88.1
 
 <tb> inducer <SEP> 2352 <SEP> Relay <SEP> activated <SEP>: Driver <SEP> to <SEP> marker: <SEP> Set <SEP> to <SEP> the <SEP> land
 <tb>
 <tb> (MKR, <SEP> Fig. 25).
 <tb>
 
 EMI88.2
 ivert none NVO-2543 ..... earth, coiled 2510
 EMI88.3
 
 <tb>: <SEP>: <SEP>: <SEP> 3-2511
 <tb>
 
 EMI88.4
 : BED. 3440. e. e -terre-1-2606-by the
 EMI88.5
 
 <tb>: driver <SEP> 2652
 <tb>
 
 EMI88.6
 ; manages resistance. 2511.2604. :

   LTT..3440 e. e. : terrē2..2604
 EMI88.7
 
 <tb> zero <SEP> 2605-2b06 <SEP>: by <SEP> driver <SEP> 2652
 <tb>
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 EMI88.8
 VO-2544 ..... 8 ground, rolls 2510
 EMI88.9
 
 <tb>: 2-2511 <SEP> by <SEP> conduc-
 <tb>
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 <tb>
 
 EMI88.10
 wanders resist. 2511-2605- VO-2544 ......: earth, rolled 2510
 EMI88.11
 
 <tb> 700 <SEP> ohms <SEP> 2606 <SEP>: 2-2511
 <tb>
 <tb>: <SEP>: by <SEP> driver
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 wanders resist. 2605-2606:

   IdUU.:.2543o..e. : earth, husky1éwDGoe
 EMI88.13
 
 <tb> 2400 <SEP> ohms <SEP>: 2510-3-2511 <SEP> by <SEP> on
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 <tb>: driver <SEP> 2543
 <tb>
 
The signals through leads 2543, 2544 and 3440 indicate the type of the incoming junction to guide the operations of the marker 4 for signaling purposes and the selection or non-selection of repeaters-amplifiers for telephone communication.



   A particular indication is given by the interurban delay interoperator junction, Figo20, by the conductor 2351 which goes from the earth to the battery taking the following path: winding of the marginal relay 20199 contact 8 of the relay 2018, conductor 2351, contacts of coupling switch, recorder-sender where it follows contact 3 of relay 2700, conductor 2751, contact 5 of relay 2706, conductor 2752 and the upper winding of relay 2505 Relay 2505 operates in this baked wax but the 2019 marginal junction relay is not working at this time.

   Relay 2505 establishes a circuit for relay 3400, comprising: battery, winding of the latter relay, conductor 2571, relay contact

  <Desc / Clms Page number 89>

 2505, conductor 2570, contact 3 of relay 2509, conductor 2470 and the earth applied to contact 1 of relay 2401. The operation of relay 3L00 connects the signaling circuits to. nar marker mechanisms of conductors 3440 and 3442 which are represented by mixed lines 3445 along with other conductors going to the marker.

   This circuit and the relays provided are particularly useful for communications established by the operator of the call order table to a free trunk in groups of outgoing trunks which are connected for waiting utterance and made unavailable for calls originating of interurbein waves from the outside. These junctions are made available to the operators of the call order table by the operation of the 3L00 recorder-collector relay which connects the earth to conductor 3442 to activate a call order relay of the designated marker. by CO, which operates in the manner shown schematically in FIG. 3 as relay 307.

   After binding the recorder-sender to the marker as described later, the marker relay 307 operates at substantially the same time as the marker registers and a fraction of a second before the operation of the route relay.



  This makes the regular switching and testing of the junctions of this group effective, since the circuit for relays 304 and 308 is opened by relay 307 and thus the junction, Fig. 20, can only be directed to a free outgoing trunk of the group designated by the registered code. Before commissioning the joint, Fig. 20, recorder-sender and marker, the call order table operator has observed the state of the junctions of the outgoing trunk group of the desired turnout and knows that there is a or several free junctions in the group.

   Utility

  <Desc / Clms Page number 90>

 other signaling circuits established by relay 3400 will be explained later for particular operating characteristics related to the switchboard of the deferred call operator.



   The above junction category indicating devices are opened in response to the operation of junction relay 2018, for which a circuit is established when relays 3301;. Or. 3305, 2309 and 2612 are put into action. Recall that relay 2408 was actuated by a junction category signal and that relay 2408 established a circuit for relay 3404. A circuit is thus established for relay 2309 from the earth applied to the contact of relay 2408, what activates the relay 3304 and anrès the operation of the latter relay, is extended by the contact 3 of the relay 3304, the conductor 2331 and the winding of the relay 2309, to the battery.

   - The relay 2309 while operating connects the earth to the conductor 2330 going through the contact 5 of the relay 2502, the conductor 2530 and the winding of the relay 2612, to the battery. Relay 2612, while operating, short-circuits the high resistance winding of relay 2403, causing relay 2018 to operate by the circuit originally followed by the winding of relay 2018 and the two windings of relay 2403 to operate the relay. relay 2403. When relay 2409 is actuated by a junction which sets the recorder-transmitter for direct current pulses,

   a circuit is established for relay 3305 through contacts 2470 and 2767 and operation of relay 3305 connects conductor 2767 to conductor 2331 to actuate relay 2309 as described above.



   The relays 2611 and 2613 had been actuated beforehand and thus the functioning of the relay 2612 connects the conductor '2461 to the conductor 2464 which bypasses the coil: the upper end of the relay 2403 and the resistor 2413. The

  <Desc / Clms Page number 91>

 junction circuit relay 2018 operation establishes an obvious circuit through relay 2022 which locks to earth applied to contact 2 of relay 2020. Relay 2022 connects earth through the top winding of junction selector relay 2000 to signal to the operator with long distance calls / waiting that the recorder-sender has been connected to the trunk circuit.



   Operation of the junction relay as described above causes the release of any of the relays 2404 to 2409 that were actuated and causes the relays 2701 and 2706 to operate. These two relays are actuated from the applied earth. to conductor 2531 which extends through the windings of both relays and the winding of relay 2309 made effective by releasing relay 2408 or any of the relays at 2409 2404 / causing this removal from the earth of conductor 2331 followed previously to operate relay 2309.

   Ground applied to conductor 2331 places a shunt on relays 2701 and 2706 to prevent their operation until the junction category signals have been recorded in the logger. Relay 2701, in operation, establishes a circuit for recorder director relays 3001 and 3100. The circuit of these relays includes: earth applied to contact 6 of relay 2701, conductor 2753, conductor 2853, contact 2 of relay relay 3002, the windings of the directing relays 3001 and 3100 in series and the battery, actuating these two relays preparing the reception of the code and digital pulses.

   Operation of relay 3001 establishes a blocking circuit for itself and a circuit for relay 3002 comprising the same earth, contact 3 of relay 3001, winding of relay 3002 and the battery. The operation of 3001

  <Desc / Clms Page number 92>

 connects the earth to the battery passing through conductor 2853, contact 2 of this relay, the. windings of the guiding relays 3006 and 3105 and the battery, causing the operation of these relays. Operation of relay 3006) extends earth from conductor 2853 through the windings of the director relays 3008 and 3113 which continues until all of the director relays are actuated one after another in response to the link. from earth to conductor 2853.

   These conductive relays are switched off one after the other in response to the transmitted digits.



   DC AND AC CURRENT PULSES
 EMI92.1
 -------------------------------------------------- ----
It was previously explained that the junction circuit signaling paths which are put into action indicate to the recorder-sender whether preparation is to be made to receive pulses of alternating or direct current to adjust the recorders of that recorder. - sender. When relay 3304 is actuated, the recorder-sender is arranged accordingly to receive ac pulses and when relay 3305 is actuated, the recorder-sender is arranged to receive pulses of direct current.

   These relays operate either the AC pulse control relay 2805, or the DC pulse control relay 2804 to which the pulse conductors 2041 and 2042 are connected from the trunk position, and of the junction.

   Relay 2805 is activated because conductor 2841, contact 2 of relay 3304 to earth applied to contact 11 of relay 2400 or relay 2804 is activated by conductor 2840, contact 2 of relay 3305 to earth applied to contact 11 of relay 2400. Note that either relay 3304 or

  <Desc / Clms Page number 93>

 relay 3305 when activated is blocked to this earth applied to contact 11 of relay 2400. Relay 3002 which is blocked to earth applied to conductor 2853 establishes circuits for mechanisms associated with either the pulse circuit. alternating current of the recorder-sender,

   or to the DC pulse circuit of the recorder-sender, depending on whether it is relay 2805 or relay 2804 which has been activated. Conductors 3041 and 3042 connect to earth from contacts 3 and 4 of relay 3002 followed through sheets 29 and 28 where conductors 3041 extend through the winding of DC pulse relay 2702 and contacts d Other DC relays to peak pulse lead 2041 if DC pulse relay 2804 has been actuated.

   Conductor 3042 extends through the winding of DC pulse relay 2703 and the contacts of other relays to neck pulse conductor 2042 if relay 2804 has been actuated. The direct current pulse method will be described in a separate paragraph. With the AC relay 2805 actuated, the pulse leads 2041 and 2042 are connected to the input coil of the recent circuit 3200 and a circuit is established for the relay 2 03, when the relay 3002 is actuated.
 EMI93.1
 



  DFIRIC RECORDERS <I13 the i: hlUfi-El.iiÎll'lJ: iJit RLCLE2 BY DC PULSES DL.



   For this part of the description it will be assumed that relay 2804 has been actuated and therefore direct current pulses are employed to tune the recorder-sender registers. Relay 2703 is actuated from the ground supplied from contact 6 of relay 3000, contact 3 of relay 3002, by conductor 3042 which extends through the coil of relay 2703 to neck conductor 2042 to to the battery in the

  <Desc / Clms Page number 94>

 DC pulsed sink, not shown. Relay 2703 is blocked on the battery by its contact 2.

   Earth is likewise connected through contact 4 of relay 3002 by conductor 3041 to the winding of relay 2702 which, under certain conditions, has a control circuit going to the battery on peak conductor 2041. This relay is activates when a call originates in certain switch tables in order to indicate to a marker that the call comes from this switch table through a long trunk. The two relays 2703 and 2702, on the other hand, perform the same function of connecting the windings of relays 2404 to 2409 inclusive, to conductors 2041 and 2042 of the pulse keys.

   The pulse keys transmit a positive and negative potential through weak and strong resistances passing either the tip conductor 2041 or the neck conductor 2042, or in different combinations by these two conductors to actuate the relays 2404 to 2409 separately or in combinations in order to set the recorder-sender as indicated in the following table:
 EMI94.1
 Key Driver - Driver 2406 2409 + relay 2407 2404 2405: t eur T: R: 2042 2406
 EMI94.2
 
 <tb> 0 <SEP> L <SEP> + <SEP> X
 <tb>
 <tb> 1 <SEP> H <SEP> + <SEP> X <SEP> X
 <tb>
 <tb> 2 <SEP> L <SEP> - <SEP> X
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 'J3C Î Î Î Î Î Î Î Î
 EMI94.4
 
 <tb> 3 <SEP> H- <SEP> X <SEP> X <SEP> X
 <tb>
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 EMI94.5
 4. L +. L -. X.

   X X
 EMI94.6
 
 <tb> HI <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP>: <SEP> @
 <tb>
 
 EMI94.7
 -J. L + H + X X Y>
 EMI94.8
 
 <tb> L
 <tb> -M <SEP> H <SEP> + <SEP> H <SEP> X <SEP> X <SEP> X <SEP> X
 <tb>
 
 EMI94.9
 N0::::: t:

  <Desc / Clms Page number 95>

 
 EMI95.1
 7-R: L -: h +: x: x:: X: x PRS 8 X -: E +:) 1 X X X
 EMI95.2
 
 <tb> TUV
 <tb>
 
 EMI95.3
 9-W L + H- X X X X
 EMI95.4
 
 <tb> WXY
 <tb>
 <tb> ST <SEP>: <SEP> R <SEP> + <SEP> L <SEP> - <SEP> X <SEP> X <SEP> X <SEP> X
 <tb>
 H + indicates a direct earth, L + indicates a high resistance earth, H - indicates a low resistance battery, L - indicates a high resistance battery, X indicates the actuated relay.



   Suppose the number to register is CH3-1379. The letter C is the same as the number 2 and lowering the key 2 will connect the negative potential of the 48 volt battery to the 2041 lead to activate the 2408 relay and the 2404 polarized relay. The 2408 activated relay connects the earth by conductor 2467, contact 3 of relay 2701, conductor 2740, contact 2 of relay 3100, conductor 3130, to a winding terminal of relay 3001, which puts a shunt on the winding of the latter relay to bring it down. This earth acts as a blocking earth for Relay 3100, which keeps this latter relay in action.

   The operation of polarized relay 2404 connects earth to conductor 2469 which extends through a circuit comprising contact 4 of relay 2701, conductor 2742, contact 4 of relay 3100, lower winding of relay 3102 of recorder A2, activating this recorder relay which locks to the earth applied to contact 5 of extra-normal relay 3000. Releasing key no 2 causes relays 2408 and 2404 to drop. Releasing relay 2408 removes blocking earth for relay 3100 which re-

  <Desc / Clms Page number 96>

 falls .

   Releasing relay 3100 transfers the pulse relay conductors from relays 3101 to 3104 from recorder A to relays 3106 to 3109 from recorder B since progress relay 3105 has already operated together with the director relays shown. in the left part of Fig. 30.



   The oberator lowers key 4 to register the code digit h immediately after releasing key 2. This connects a positive potential, passing through a strong resistance, to the tip conductor 2041 and a negative potential, passing through a strong resistance. by a high resistance, to the neck conductor 2042, which actuates relays 2408, 2409 and 2405 as shown ', in the table. The earth connected to conductor 2740 by relays 2408 and 2409 shunts relay 3006 and holds relay 3105.

   The earth of the contact of relay 2405 is connected to conductor 2745 which extends through contact 5 of relay 3100, contact 6 of relay 3105, the lower winding of relay "B4" 3108 it the battery, actuating this last relay which locks to the earth applied to contact 5 of relay 3000. The director relays are gradually released as the digits are recorded and thus the logger relays for the code and numeric digits are actuated, successively in the manner indicated above.



   When the onerator has finished operating the pulse key, it lowers a starting key that connects a positive potential, passing through a weak resistance, to the peak conductor 2401 and a negative potential, passing through a strong resistor, at conductor 2042, to actuate relays 2408, 2409, 2406 and 2405. Operation of relays 2406 and 2405 connects earth to conductor 2741 shown connected to conductor 3441 and conductor 2745 shown connected to conductor 3495 ce which activates relay 2609.

   Relay 2609 only operates

  <Desc / Clms Page number 97>

 when the two upper and lower windings, are fed as in the circuit followed from the earth applied and 2405 qué to the contacts of the relays 240'0 / and one or the other of these relays activated alone will not cause the operation of the relay 2609 (marginal). At this time the 3506 director relay remains actuated and the other director relays have been gradually released while the digits were being recorded.

   The operation of relays 2406 and 2405, therefore, causes the start loggers 3508 and 3509 to operate since the earth is connected by conductors 2741 and 2745 which pass through the contacts of the released directing relay to contacts 3 and 4 of the relay 3506 and to the lower windings of relays 3508 and 3509 up to the battery. Resuming the operation of relay 2609, it appears that this relay only remains actuated while relays 2406 and 2405 are actuated, and then drops out.

   Operation of relay 2609, however, establishes a circuit for relay '2610 which is blocked by conductor 2655 which goes to the ground applied to contact 8 of relay 2400. The purpose of actuating relays 2609 and 2610 in the manner described is. to provide a control circuit for relay 2800 after receipt by the recorder-sender of the pulses for all digits and after releasing for the last time the pulse relays 2406 and 2405. The circuit for the relay 2800 includes:

   blocking earth for relay 2610, back contact of relay 2609 released, conductor 2642, contact 1 of relay 2804, contact 3 of relay 2704, coil of relay 2800 and battery. Operation of relay 2800 connects relay 2801 to spike conductor 2041 and relay 2802 to neck conductor 2042. At this point these conductors terminate in polarized relays associated with the pulse key pad, now operating saying as a signal / that the recorder-sender has recorded

  <Desc / Clms Page number 98>

 the figures; -the satisfactory manner.

   The operation of these polarized relays connects the earth to the tip and neck conductors 2041 and 2042 which causes the operation of the two relays 2801 and 2802 which close a circuit to control the relay 2704, which locks to the earth on the conductor. 2642, releases relay 2800 and connects resistor 2715 and capacitor 2716 across the tip and neck conductors. A signal is thus given to the attendant warning her that the recorder-transmitter has reacted to signals sent from the attendant position circuit.



   The entry of a marker and the operation of the register-sender in response to the entry of a marker will be described after a description has been given of the methods employed to tune the register-sender by the transmission of data. alternating current pulses from a keypad as shown to the attendant position circuit, freeze 11.



   SETTING THE RECORDER-SENDER RECORDERS
BY ACTUAL CURRENT PULSES.



   -------------------------------------------------
The recorder-sender (Fig. 23 to 35) can be regulated by pulses of alternating current when it is associated with a long-distance operator position equipped to send pulses of different frequencies which can be of the type showed in Figs. 8, 9, 10, 11 and 15. The cord and position circuit mechanism associated with the AC power system shown in FIG. 15 is part of the equipment for an order switchboard position of anpels.

   Alternating current pulse equipment of substantially the same tyne may, however, be located in an outside toll operator's room in a different office, set up to link with the recorders of that office. office on an incoming trunk circuit,

  <Desc / Clms Page number 99>

 as shown schematically here. In the following description, the association and operation of the cord and position equipment will be shown, and likewise will be described how to operate the signaling current supply circuit (Fig. . 15).

   The signals are transmitted from the signaling current supply circuit (Fig. 15), by the operation of the keypad keys to the reception circuit (Fig. 32) and the operation of this receiver circuit will be necessary for a complete understanding of the association of the recorder-sender mechanism (Figs. 23 and 35). The operation of the recorder-sender in response to AC signals transmitted to the keyboard will be described after the description of the transmission and reception mechanisms.



   CIRCUIT M OPERATING POSITION.



   --------------------------------
When the operator position of the call order board is occupied, earth is connected to conductor 383 from the contact of relay 900 and therefore operation of key 803 establishes a control circuit for relays 802 and 815. The key 803 is operated to establish a link with a recorder-sender after the insertion of the plug 820 in junction jacks such as jacks 2025 and 2026. This relay 901 of the telephone circuit of the operator (Fig. 9) is energized by a circuit comprising the battery, the winding of this relay, the conductor 839, the contact 2 of the key 803, the contact 7 of the key 815, the contact 1 of the relay 803, the conductor 838 and earth.

   The operation of the relay 901 connects the earth, through its contact 1, to the conductor 832 which establishes a blocking circuit for the two relays 802 and 815. At this moment the circuit comprises: the earth, the lower winding with high resistance of the junction relay 2000, the

  <Desc / Clms Page number 100>

 socket driver, contact 4 of relay 815, conductor 850, upper coil of relay 1012, coil of relay 1009 and the battery. Relays 2000 and 1009 operate in the traced circuit but due to the higher resistance of the lower winding of relay 2000, relay 1012 does not operate at this time. Relays 1012 and 1011 are biased for marginal operation.



  The operator now operates the key 1111 which establishes a circuit for the relays 1103 and 1113. The circuit for the relay 1113 comprises the battery, the winding of this relay, the contact of the key 1111, the contact 5 of the relay 1009, contact 1 of relay 1016 and earth applied to contact 1 of relay 1100. The circuit for relay 1103 includes: the battery, the coil of this relay, the key contact 1111 and the earth applied to contact 1 of the relay 1100 by the circuit followed to drive relay 1113. Operation of relay 1103 turns on lamp 1104 by an obvious circuit passing through contact 6 of the relay.

   The relay 1103, while functioning, blocks, by its contact 3, the contact 3 of the relay 1115, the contact 7 of the relay 1103, the contact 5 of the relay 1009, the contact 1 of the relay 1016, to the earth applied to the contact 1. relay 1100. Relay 1113, operating in the same way, is blocked by its contact '2, contact 3 of relay 1112 to earth by contact 7 of relay 1103 as previously followed. The operation of relay 1113 opens the circuit - the lamp 1114 by its contact 1. It will be noted. this moment that the contact of relay 1012 is at. this moment connected, by contact 8 of relay 1103, contact 3 of relay 1113 and the winding of relay 1112, to the battery.

   Relay 1012, however, is not activated until a free sender has been selected and the logger-sender mechanism is able to receive the signals for realigning the loggers. The func-

  <Desc / Clms Page number 101>

 Operation of relay 1103 connects conductors 84th and 848 from the junction circuit, through contacts 4 and 5 of relay 1103, to windings C and D of the repeater coil
1106. The conductor 1132 also goes, via contact 2 of relay 1103, to. a point between the windings C and D of the repeater coil 1106.



   At this point in the operation of the position mechanism of the call switch panel, a signal from
The recorder-sender is necessary to ensure the position mechanism that a free recorder-sender is ready to receive ac pulses. It will be recalled from the preceding description, with regard to the operation of the recorder-sender when it is associated with the mechanism of direct current pulses, that the junction circuit activates a setting circuit. in the process of coupling in order to choose a free recorder-sender. This starter circuit is energized when relay 2000 operates after the attendant connects plug 320 to jakks 2025 and 2026.

   The operation of relay 2000 establishes a circuit through relay 2020 which connects the earth of contact 5 of relay 2021, through contact 4 of relay 2020, to the start circuit 2040 (wire 1 marked TTR leading to the recording circuit also note that the ACM wire corresponds to the extinction of the alternating current lamp).

   As previously described, this turn-on circuit energizes the coupling and turns on a coupling control circuit. As stated in the previous description of a recorder-sender, a certain number of relays are energized when the coupling chooses this recorder-sender. This comprises the relays 2400, 2401, 2403, 2402, which bring the connection of the junction circuit (Fi, -. 20) to the recorder-sender by means of the coupling switches, and cause the switching off.

  <Desc / Clms Page number 102>

 a coupling control circuit activated to choose the recorder-sender.

   The extra-normal logger-sender relays, such as relays 2502 and 3000, are activated as soon as the logger-sender is connected to the junction circuit and after that other relays are activated as described previously, according to the category of the junction associated with the recorder-sender.

   In this case we can assume that this category 3304 relay is energized since the recorder-sender is associated with a junction and operator position circuit arranged nourishing pulsed alternating current signals and that the operation of relay 3304 established a circuit for the relay 2805 with alternating current pulses comprising: the battery, the winding of this relay, the conductor 2841, the contact 2 of the relay 3304, and the earth applied to the contact 11 of the relay 2400 .

   Relay 2805 connects tip and neck conductors 2041 and 2042 from the onerator position circuit, through the junction, to the re-insertion circuit (Fig. 32). It will be recalled from the previous description that the relays 2701 and 2706 are energized as soon as the categories of the trunk records have been transmitted to the recorder-sender. The operation of relay 3304 also establishes a circuit for relay 2611 including: ground, relay contact 3305, relay contact 3304, lead 2666, relay winding 2611, and battery. Prior to this time, relays 2612 and 2613 were actuated upon entering the recorder-sender, similarly as previously described.

   Operation of relay 2611 connects conductor 2461 to ground through a circuit comprising the winding of relay 2403, contact 3 of relay 2311, contact 4 of relay 2613, contact 2 of relay 2612, conductor 2464, and contact 2 of relay 2402. This, therefore, short-circuits the top winding of relay 2403 and resistor 2413 and consequently

  <Desc / Clms Page number 103>

 directly connects the earth to the battery through the lower winding of reals 2403, conductor 2760, relay contact 2708, conductor 2460, contact 3 of relay 2400, conductor 2454, winding of relay 2018, - which results in the operation of relay 2018.

   The relay 2018 while operating establishes a circuit comprising the earth applied to its contact 3, the winding of the relay 2022 and the battery, making this last relay operate and this last relay locks to the earth applied to the contact 2 of the relay 2020. The operation of the relay 2022 establishes a circuit including the earth, the contact 1. of this relay, the contact of the relay 2004, the resistor 2027, the top winding of the relay 2000, the sockets conductor of the junction, the contact 4 of relay 815, conductor 850, upper coil of relay 1012, coil of relay 1009 and battery.

   Since the resistance of the circuit crossing the upper winding of relay 1012 has been reduced by the previous operation, this relay operates and connects the earth to the battery by a circuit comprising the contact of this relay, contact 8 of relay 1103, contact 3 of relay 1113 and the winding of relay 1112, which operates the latter relay.



  Relay 1012 also connects earth, through resistor 1030, to conductor 851 to ignite bead circuit lamp 812 as a signal that the recorder-sender is now prepared to receive the AC pulses to tune the recorders. . The relay 1112 connects the two conductors 1134 and 1135 of the alternating current signaling circuit (Fig. 15) passing through its contacts 1 and 2 to the windings A and B of the coil 110b.

   The pulse key start signals are immediately transmitted through the C and D windings of the repeater coil 1106, the tip and tip conductors.

  <Desc / Clms Page number 104>

 neck 487 and 848, the bead circuit and the junction circuit, conductors 2041 and 2042, contacts 5 and 6 of. recorder-send relay 2805, leads 2842 and 2843, to the receiver circuit input transformer 3200, to prepare the receiver circuit for the ac digit pulses subsequently created by the key one after the other.

   In this way alternating currents of two frequencies, 1100 cycles and 1700 cycles, are transmitted to the input transformer 3200 to adjust the receiver circuit, as will be described later.



  How to transmit combinations of alternating currents at two frequencies through these conductors will also be described. Operation of relay 1112 opens the blocking circuit for relay 1113 which passes through contact 3 of relay 1112. Relay 1113 is, however, delayed release, in consideration of the fact that resistor 1110 is in shunt with its. winding. The release time of relay 1113 ensures the operation of the receiver circuit mechanism of the recorder-sender before releasing relay 1112. The blocking circuit of relay 1113 is open by contact 3 of relay 1113 which opens the relay. signal conductors 1134 and 1135 described as passing through the receiver circuit of the recorder-sender.



  The signaling lamp 1114 is thus on since a circuit for this is established by contact 1 of relay 1113, contact 4 of relay 1112, contact 7 of relay 1103, contact 5 of relay 1009, contact 1 of relay 1016, and the earth applied to contact 1 of relay 1100.



   The ignition of lamp 1114 is a signal to the attendant that the recorder-sender mechanism has operated and has associated the receiving circuit with the operator's position mechanism and therefore that the system constituted by this mutual association is ready for transmission

  <Desc / Clms Page number 105>

 AC signals from the operator's keypad 1108 to set the recorder-sender recorders. The operation of each key of the operator's keypad 1108 transmits current at two frequencies from the frequency mixing coils 1586 to 1587 depending on the key operated.

   The numerical value of each key is shown on the key, having its equivalent in code letters according to a table which will be made available., Before continuing, the following description will be given of the current supply circuit of signaling for the keys of alternating current pulses, shown in Fig. 15.



   SIGNALING CURRENT SUPPLY CIRCUIT ------------------------------------------ --------
Referring to FIG. 15 The theory of operation of the oscillator for the AC power supply circuit is as follows:
Referring as an example to the oscillator which is the source of alternating current at the frequency of 700 cycles, the general theory of operation of the oscillator of the bridge type used in this circuit will be described as follows: the oscillator consists of a vacuum tube 1563 which is arranged in the circuit to function as a high amplification pentode tube. Usual filament dt plate battery sources are provided, along with a frequency and amplitude control bridge.

   Two arms of the bridge are formed by the left windings of output transformer 1568, which transformer, optionally, has a low output impedance, terminating in test jacks. The third arm is resistor 1569 which is mounted in the same unit with nonlinear variation resistor 1566. The fourth arm is an anti-resonant circuit consisting of the delay coil 1567 and the capacitor 1565 in parallel, which are different for each oscillator. Part of the coil inductance

  <Desc / Clms Page number 106>

 thyrite 1567 is shunted by resistor / nonlinear variation 1566.

   A blocking capacitor 1564 and a gate leakage resistor 1561 are provided to isolate the tube gate from the DC component of the plate current. The impedance presented by the arm of the bridge consisting of the delay coil 1567, the capacitor 1565 and the nonlinear variation resistor 1566 depends on both the amplitude and the frequency of the voltage. across bridges.



  At the anti-resonance frequency, this impedance is a resistance slightly higher than the resistance in the opposite arm consisting of the resistance unit mounted with the non-linearly varying resistance. For frequencies above or below the anti-resonance frequency, it is respectively an inductive capacitance or reactance of a magnitude that becomes smaller as the frequency deviates further from the anti-resonance frequency. The nonlinearly varying thyrite resistor 1566 causes the impedance to also respond to changes in amplitude.

   For low voltages, the non-linearly varying resistance to a very high effective resistance, but its value decreases rapidly as the voltage amplitude increases. Sockets are provided on inductor 1567 to allow for adjusting the "choking" effect resulting from the anti-resonant circuit.

   These effects of frequency on the phase angle of the impedance near the anti-resonance, and of the amplitude on the magnitude of the anti-resonance impedance are employed as described below. nour stabilize the frequency and amplitude of oscillations. Due to the strong amplification of the nentode tube the variation in grid potential only needs to be a volt or two (depending on the external load) to give the normal signal amplitude of 103 volts maximum

  <Desc / Clms Page number 107>

 instant between the plate and the earth. Thus the bridge operates very close to equilibrium and is very sensitive in its control functions.

   For example, assume that an external load is stretched from the plate-to-earth circuit. This load can be expected to decrease the magnitude of the plate voltage. A very small drop, however, increases the imbalance of the resistances of the bridge and thus gives sufficient excitation to the. grid to supply the charging current. As a result, within the power limits of the tube the amplitude of the voltage at the plate is practically independent of the load. For similar reasons, it is also quite independent of the voltages of the supply batteries and of the tube output as long as these amounts are suitable to provide the desired output current without overloading the tube.



   In addition to adjusting the load and stabilizing amplitude and frequency, another property of these oscillators is important since it facilitates mixing of frequencies into pairs as shown. Each output coil is fed its two frequencies by bridging a mixing coil such as 1586 to 1597 between the plates of the suitable oscillators. This arrangement requires each oscillator not only to provide its own load current but also to derive to earth the load currents of the other frequencies which pass through the mixing coils 1586 to 1597. In fact, we can immediately see that the sum of all the bypass currents through any oscillator is equal to its own output current generated by itself (peak values to be used in both cases).

   In order for there to be no interference at the six frequencies to a questionable extent, the oscillators must effectively exhibit low impedances at their bypass currents. The way they do this is

  <Desc / Clms Page number 108>

 easy to explain. Assume that the current to be shunted comes from the load producing a small voltage drop across any impedance to earth presented by the oscillator. This voltage at terminal T of the coil has a frequency far removed from the anti-resonance frequency and thus encounters a low reactance in the anti-resonant circuit.

   The point represented by the S terminal of the coil-inductor receives approximately the same voltage which in turn is applied to the grid of the tube. This grid voltage causes the tube to conduct a current from the plate to the cathode equal to that which flows from the load. This transmission of unwanted current through the tube at the expense of a voltage drop sufficient only to drive the grid can be expressed as a low effective impedance leading to the ground. This makes possible the efficient use of the power resources of the tube, eliminating impedance imbalances or attenuators between oscillators and load that would otherwise be necessary to prevent interference.



   Two of the output leads 1580 to 1585 are connected to each mixing coil 1586 to 1597 to provide several different combinations of two frequencies, each for transmitting signals of two different frequencies to record the numerical value of each code.



   KEYBOARD.



   The conductors from the mixing coils 1586 to 1597 inclusive go to the AC keyboard circuit, Fig. 11, to be used by the operator by adjusting the recorders and towards all the recorders-senders of the office to transmit signals by pulses of alternating current as shown: in the circuit of pulses towards the outside, Fig. 29 and 30, of the recorder-sender. The use of this a.lter- current source

  <Desc / Clms Page number 109>

 native of different frequencies will be understood by the description of the link circuits.

   The following frequencies are used, for example, for signals according to the following table:
700 n
0
900 n
1,700 n
1300 n
2,900 n
1300 n
1300 n
3
1500 n
900 n
4
1500 n
1100 n
5
1300 n
700 n
6
1100 n
900 n
7
1100 n
1100 n
8
1500 n
700 n
9
1500 n Keys on keypad 1108, corresponding to the desired code and numeric digits, are lowered and emit alternating current signals that consist of different combinations of frequencies for each digit, as shown. The receiver associated with the recorder-sender reacts to these signals and causes the recorders to operate.

  <Desc / Clms Page number 110>

 of the identifier and numeric digits of the recorder-sender, this will be described.

   Before describing the effect of currents of different frequencies on the receiver circuit, the operation of the transmission circuit can be completed by saying that acres the transmission of numerical digits and callsigns by the operation of a number of keys of the keypad, the attendant operates the key 1117 which activates the relay 1115 to indicate to the receiver that all the numerical and area code digits have been transmitted.



  The relay 1115, while functioning, locks to the earth applied to contact 1 of relay 1100 as previously followed by contact 7 of relay 1103. Thus a last combination of currents of frequencies 1500 and 1700 cycles passes through conductors 1136 and 1137 to the windings A and B of the rewinding coil 1106 and is passed to the input coil 3200 of the receiver circuit as follow-up. It will be remembered that the blocking circuit for relay 1103 passed through its contact 3 and the contact of relay 1115.

   The relay 1103, however, remains actuated making that the key 1117 is operated since, when this key is operated, a blocking earth is associated with it by the contacts of the key and the contact 3 of the relay 1115 actuated, but when this key is activated. released the circuit for relay 1103 is open, causing its de-energization. Since the blocking circuit for relay 1115 passes through contact 7 of relay 1103, the Day circuit 1115 is opened shortly after the release of key 1117.

   The release of these relays is somewhat slow from the end of the shunt by the resistor 1116 on the winding of the relay 1103 and consequently the signaling current breaking 'because the keys 1136 and 1137 is held 1) in-
 EMI110.1
 dant un ter;] 1 "Js S1Jffisé '.. 1, wnt lonj; 701ar energize the tl1Óc;: mj.SI, the of the receiver circuit. Releasing relay 1103 restores the normal state of the mechanism of the circuit of the position .

  <Desc / Clms Page number 111>

 



   RECEIVER CIRCUIT ASSOCIATED WITH A RECORDER-SENDER.



   When a recorder-sender having associated with it a receiving circuit of pulses by an alternating current key, is seized., And the call requires the use of the receiver circuit, the recorder-sender, by activating the relay 2805, puts conductors "T" and "R3 2041 and 2042 at the junction and connects the battery to conductors 2846, 2845 and 2844. The battery, through conductor 2846, energizes the bias windings on relays 3261, 3267 and 3266.



  It is connected aassi to resistors 3244, 32-7, 3250, 3253 in preparation for the subsequent operation of relays 3261, 3266 and 3267, and for changes in screen grid voltage for vacuum tubes 3239 to 3242.



  The battery, through lead 2844, energizes the run (primary) winding of relay 3260, but the relay remains released because its secondary winding is energized by the. battery on a circuit leading to earth through its contacts, contacts 5 of relay 3270, and contacts and armatures of relay 3255. Conductor 2844 is likewise connected to the windings of relay 3270 and 3269 in preparation for their subsequent operation. The battery, through lead 2845, is connected through the windings of the pulse count relay 3300, the action of which will be described with the operations of the recorder-sender to adjust the recorders.



   INPUT CIRCUIT ----------------
The 3200 input repeater coil is a well balanced, shielded coil designed to reduce the effect on longitudinal currents which could cause faulty receiver circuit operation. It is provided with selectable wiring arrangements (not shown), which can be wired in different ways depending on the type of circuit with which the receiver circuit is associated.

  <Desc / Clms Page number 112>

 



   The input attenuator comprising resistors 3201 and 3202, 3203, 3204 and 3205 is a means of adjusting the sensitivity of the receiver circuit to the minimum required by the circuit associated with it, since, keeping the sensitivity as low as possible, the probability of malfunction by conversation currents or noise is materially reduced.



   By calculating from the data of the junction design, or by taking measurements in the worst conditions, the maximum attenuation can be determined for all types of junctions on which the receiving circuits will have to operate. In making these calculations or measurements, the repeater coil at the receiving end will not be included.



   Resistors 3205 and 3207 provide a termination for the junction. This also gives a balanced mean anoint to which the earth is connected to aid the development of the longitudinal currents.
 EMI112.1
 



  Llr.:IT!1JI 1> E VOLUI [8.



   The vacuum tubes 3217 and 3218 and their associated input and output circuits constitute a volume limiter which provides adequate amplification of the ac pulses to cause the operation of individually tuned receiver circuits which will be known herein as channels, and which also limit the amplification to a value such that unwanted channels will not operate by the transient currents which are generated at the start and stop of the AC signals and when they are are born and disappear in the filters.

   Amplification
 EMI112.2
 tion e <3t.tmit / e to a value more low at the start of the pulse than at its end, since, if there is chatter at the contacts when keying the signals of different frequencies at the transmitting end , the necks

  <Desc / Clms Page number 113>

 Start transient rants are abnormally important. How this reduction in the limited flow is achieved is what will be explained with the signaling presence circuit.



   The limiting action is obtained by means of the control gate networks 3209 and 3210, which cause the gate bias current to be more negative, when the alternating current on the gates becomes large enough to bring them to. draw current during positive half waves. When this condition is reached the power flow becomes approximately constant regardless of subsequent increases in the gate voltage. The actual point at which limiting occurs is controlled by the voltage of the screen grids and cathodes as well as that of the control grids. The desired value for the screens is obtained by potentiometer 3280.

   The potential of the cathodes is obtained from the battery by crossing the repeater coil 3211 and a potentiometer arrangement of the resistors 3212, 3213, 3214, 3215 and 3216.



   SIGNALING PRESENCE CIRCUIT.



   -----------------------------------
The signaling presence circuit is activated by the small voltage developed at the ends of resistors 3221 in the output circuit of the volume limiter. This voltage is passed through resistor 3222 and high pass filter 3228 which is provided to suppress low frequency speech and noise currents which can cause malfunction. Resistor 3222 is connected in series with the input of the filter in order to bring its terminal impedance to its suitable value. The output voltage of the filter, raised by the 3230 input transformer, is applied to the 3219 vacuum tube, which operates as

  <Desc / Clms Page number 114>

 rectifier due to resistor 3281 in its control gate circuit.

   Relay 3259 has its secondary winding, or branch circuit mounted in the tube plate circuit, while its primary winding, or run circuit is energized by the battery passing through repeater coil 3211. When not there has no AC signal present on the vacuum tube grid, the plate current flowing through the secondary of the relay is large enough to cover the effect of the current in the primary and the relay remains normal, but when An AC signal appears, the plate current is reduced and relay 3259 operates.

   The control grid of the vacuum tube 3219 is kept positive under normal condition by the voltage obtained from the potentiometer made of resistors 3235 and 3236. This positive bias, along with the reduced screen grid voltages obtained by using resistors 3282 in the screen wire, improves circuit operation and reduces the effect of tube variations.



  A capacitor 3283 is provided to deflect the AC current around the resistapce 3282.



   As said before, the limited flow rate of the volume limiter is reduced to a lower value at the start of the pulse at the end. This is done as follows: with relay 3259 resting on its rear contact, earth is connected to conductor 3284 which increases the voltage drop across resistor 3222. This effectively lowers the plate and screen voltages applied to the test tube. limiter, which reduces the flow of the volume limiter.



  This also causes an unwanted reduction in amplification without limiting the volume limiter, which in turn would reduce, unless corrected, the sensitivity of the presence channel of signals. To compensate for this reduction in sensitivity, the effective grid polarization of the tube

  <Desc / Clms Page number 115>

 3219 is reduced by an amount sufficient to return its sensitivity to normal.

   Ground applied to conductor 3284 from the back contact of relay 3259 causes an increase in voltage drop across resistor 3285, reducing the bias current of tube 3219 and thereby increasing its sensitivity. Each time the 3259 relay leaves its Back contact, the volume limiter and the channel both begin to return to normal after the short time it takes to charge capacitor 3286. The increase in the volume limiter's limited flow rate is gradual enough to avoid unwanted transient currents.



   The plate circuit filter consisting of the delay coil 3287 and the capacitor 3288 serves two purposes: (a) it reduces modulation products that could feed on relay 3259; and (b) it increases both the start-up and the return to quiescent time of the relay by delaying the fade out and build-up of the vacuum tube plate current. The front contact of relay 3259 goes to the recorder-sender circuit or other associated circuit via conductor 3290.

   The run (primary) windings of channel relays 3255, 3256, 3257 and 3258 are also connected to the recorder-sender, or other associated circuit, by conductor 3291, and since these conductors are linked together in the The recorder-sender at this time, the operation of relay 3259 prepares the control circuit for the channel relays. Later, after completion of each digit registration, the path between conductors 3290 and 3291 is opened in the logger-sender or other associated circuit, and if relay 3259 is still energized, a subsequent pulse. is blocked by holding sor. open circuit until 1. that relay 3259 drops out and removes the earth from the conductor

  <Desc / Clms Page number 116>

   3290.



   TRACKS RECEPTION.



   --------------------
Six receive channels A, B, C, D, E and F are used to receive the signals of six different frequencies for the transmission mechanism of Figs. II and 15. Four of these channels are shown A, B, E and F.



  Channels C and D are omitted except channel relays 3272 and 3273 which are shown schematically.



   The voltage developed across resistor 3226 passes through resistor networks 3223, 3224 and 3225 to the inputs of filters 3227, 3229,3231, 3232 and other filters (all filters in Fig. 32 being designated by F) for other receive channel circuits not shown, which separate the signal frequencies into channels corresponding to current bands of different frequencies. The compensating filter 3289 is intended to improve the characteristics of the 700 and 1700 cy filters - keys by simulating the effect that would be produced by filters that would be adjacent to them, below and above, respectively.



   The resistor network at the head of the filters serves a threefold purpose: a) it produces an attenuation to ensure the desired relationship between the sensitivity of a channel and the flow rate of the volume limiter b it provides a termination at relatively constant impedance between the filters and the widely varying output impedance of the limiter; c) it attenuates the transients reflected by the filters.



   Each receiver circuit includes a pentode vacuum tube each of which is provided with a control gate resistor such as 3233 to operate the tube as a detector. The control gates are held positive and the screen gate resistors such as 3243 and the associated shunt capacitors of the

  <Desc / Clms Page number 117>

 screen grids are designed to improve circuit operation and reduce the effect of tube variations. The channels contain impulse relays, designated by 3255, 3256, 3257, 3258.



   The circuit is arranged in such a way that after reception of the signal on conductors 1134 and 1135 the pulse relays are blocked in operation under the combined control of the recorder-sender circuit or other associated circuits and relay 3259 and 3267.



   BLOCKING OF THE RECEIVER CIRCUIT.



   -------------------------------
The blocking effect is obtained by means of the circuits of the empty tubes. When a track relay operates, after the plate current flowing through its bias winding has been reduced sufficiently by the AC signal, it connects the screen grid of the tube associated with it to a potentiometer which provides a voltage much lower than normal. This, causes a further reduction in the plate current and prevents it from returning to normal at the end of the AC signal, with the net result that the relay is effectively blocked until its winding turns on. - che is open.

   When two receive circuit channel relays are thus actuated they remain so until the recorder-sender circuit or other associated circuit opens their run windings after the digit has been recorded; and by keeping this path open in the recorder-sender or other) circuit under the combined control of relays 3259 and 3267 of the receiving circuitry the desired recording is obtained, whether the incoming AC signals are long or of short duration.



   Pulse relays A and F designated 3258, 3257, 3273, 3272, 3256 and 3255 respectively, have their

  <Desc / Clms Page number 118>

 secondary windings connected in the correspondingly designated vacuum tube placue circuits, Their primary windings are connected in series and have their connection to the battery through the coil repeat & ce 3211. The breakdown current flowing through the coils. secondary elements of the pulse relays is in the direction of polarization. The current in the primary windings in the running direction and is of such magnitude that it cannot normally exceed the bias current.

   When an AC signal is applied to the grid of one of the vacuum tubes, however, its plate current is reduced and the associated relay operates. The highest tertiary windings of the impulse relays are also in series and go to the filtered battery from the winding of relay 3255 and to earth via the contact of relay 3269 from the winding. of relay 3258. These windings provide a little extra bias to the pulse relays when the receiver is prepared to receive digits or the signal on leads 1136 and 1137, but not when it waits, for the signal on leads. teurs 1134 and 1135.

   This bias is necessary to ensure that the relays are released after they have been blocked by the digit codes in the manner just described.



   RELEASE SIGNAL BY PULSE KEY.



   ----------------------------------------
When the receiver circuit is put to a junction or keypad circuit at the start of a call, there is a brief period during which it may be exposed to talking currents or noise which, if it were necessary to receive digit pulses, could lead to false recordings in the associated recorder-sender circuit or key circuit

  <Desc / Clms Page number 119>

 monitoring with listening.

   To prevent this, the receiver circuit is normally maintained in a state in which the digits cannot be stored until it has been released by the operation of the signals on conductors 1134 and 1135 when the relay 1112 works as discussed about the keyboard circuit. This signal has a relatively long duration and must be on the circuit for the necessary time without the simultaneous presence of the other frequencies. These signals have the frequency of 1100 and 1700 cycles pass, through the corresponding filters, to the vacuum tubes and cause the operation of relays 3273 and 3255.

   With both relays operating, earth is removed from the bias (secondary) winding of relay 3260 and capacitor 3274. Relay 3260 takes approximately 48 seconds to operate, due to the time it takes for the capacitors to charge. through the secondary winding of the relay. When either relay 3273 or relay 3255 is released, after relay 3260 has operated, earth is applied, passing through its front contact and its armature, to the windings of relays 3269 and 3270 which operate on the battery and are blocked. .

   Relays 3270 and 3269 perform the general function of transferring the previous contacts of channel relays A to F, from the pulse key circuit to conductors A to F 3292 to 3297 going to the associated recorder-sender, where the Subsequent operations of relays A to F 3307 to 3312 in suitable combinations will be recorded. The relays 3269 and 3270 likewise remove the earths which were provided by their posterior contacts on the vacuum tube sides of the resistors like 3245 in each receiver circuit.



  These grounds being removed, the blocking effect described and the operation of the test relays described can have

  <Desc / Clms Page number 120>

 location. In addition, relay 3269 provides ground to the higher tertiary windings of channel relays A through F as discussed above.



   As indicated previously, it is necessary that the signals of frequencies C and F are received for a time of defined length in the absence of signals of frequency;., These A, B, D or E if the circuit is to be unblocked. . If a pulse of one or more of these frequencies should appear at any time before the operation of relays 3269 and 3270, the corresponding relay or relays will operate and apply ground to the terminal of relay 3260 and capacitor 3274.

   This restores the bias current for the relay, immediately releasing it, and allows the capacitors to discharge quickly in preparation for a new cycle, with the distinct result that the circuit remains in the off state until frequencies C and D appear on their own for the necessary length of time.



   SIGNAL COUNTING CIRCUIT --------------------------------
The alternating current pulse key codes, consist of different combinations of two frequencies sent simultaneously. In the receiver circuit, each frequency finds a path through the corresponding filter to the grid of one of the vacuum tubes A to F, 3239 to 3242 montras, and 'causes the operation of the associated relay A to F 3258, 3257, 3273, 3272, 3256 or 3255.

   After the operation of the relays 3269 and 3270 under the influence of a signal, operation of one or more of the relays A to F has the following results: earth is applied to the corresponding conductors 3292 to 3297 going to the logger- sender or other associated circuit; and the earth is removed from the vacuum tube sides of the corresponding grid-screen resistors * The removal of the

  <Desc / Clms Page number 121>

 ground of these resistors: reduces the voltage on the screen grids of the associated vacuum tubes and keeps the relays blocked and allows current to flow to the primary windings of relays 3261, 3266 and 3267 in a proportion almost directly proportional to the number of relays A to F which are activated.

   Relays 3263 and 3267 cannot operate until the pulse key signal has been sent across leads 1134 and 1135 because they are in fact grounded by the bottom contact grounds of relays 3269 and 3270 until 'that these relays operate.



   The run and bias currents of relays 3261, 3265 and 3269 are proportioned so that none of them will operate when only one relay A to F is operating; relays 3261 and 3267 will operate when two of relays A to F are operating, and all three are operating when three or more of relays A to F are operating. Relays 3261, 3266 and 3267 are therefore used to test incoming signals and to tell the recorder or other associated circuit, whether to record a digit from 0 to 9 and the final signal based on the grounds on conductors A to F.



   Relay 3267, when actuated, removes ground from conductor 3298 and applies it to conductor 3290 in parallel with the earth from relay 3259, when relay 3259 is actuated. Relay 3251, when actuated, removes a short circuit from resistor 3262 and effectively adds that resistor in series with the run windings of track relays A to F by inserting it into conductor 3291. Likewise the relay relay 3261 provides ground to conductor 3299 through relays 3267 and 3302.

  <Desc / Clms Page number 122>

 



   The primary windings of relays A to F 3258,
Since 3257, 3273, 3272, 3256, and 3255 are grounded through resistor 3263, the circuit has its full sensitivity, but after relay 3261 has operated and inputs resistor 3262, the sensitivity is somewhat reduced.



   This is done to increase protection against malfunctions as a result of transient and intermodulation currents which may occur on unwanted channels.



   As previously indicated, the path between conductors 3290 and 3291 is closed in the recorder-sender or other associated circuit at the start of each digit, and remains so until the recorder-sender or other circuit. opens after completion of the recording, releasing the channel relays.

   Once this has occurred, the circuit remains open and the channel relays remain idle until both relays 3259 and 3267 are released and the conductor 3290 is subsequently grounded. from relay 3267 ensures that the digit will be recorded correctly for short pulses, this being due to the fact that relay 3267 is held by blocking relays A to F as described, while the earth of relay 3259 ensures that it does not There is no double recording in case the incoming AC signals are held longer than is actually needed for recording.
 EMI122.1
 



  Relay 326-3 Rst is provided to allow the circuitry to distinguish between correct digit signals, containing only two frequencies at a time, and erroneous signals made of more than two frequencies. If three or more of relays A through F were to operate, removing ground from the vacuum tube sides of corresponding resistors such as 3243 and 3245 will increase the current to relays 3261, 3267 and 3266 to the point where current / 1 of polarisa-

  <Desc / Clms Page number 123>

 tion is insufficient to keep slacking any of them.

   The relays 3261 and 3267 operate as described above, but they have no effect because the relay 3266, by removing the earth from the conductor 3279 and applying it to the conductor 3278 says to the recorder-sender or to the associated circuit, that the received signal is incorrect.



   Rather, operating a single channel relay by itself applies ground to the corresponding conductor to the recorder-sender, or other associated circuit, where it is not a problem because relays 3261 and 3267 did not work. Removing ground from the vacuum tube side of only one set of screen grid resistors is not sending enough current to the relays
3261, 3267 and 3266 to cause any of them to work.



   GUARD OR FINAL SIGNAL.



   ---------------------------
The signal on leads 1136 and 1137 consisting of E and F frequencies of 1500 and 1700 cycles is emitted after all digit codes have been transmitted, but whether it serves some useful purpose or not depends on the arrangement. recorders provided in the recorder-sender or other circuit with which the receiver circuit is associated. In some cases, the traffic is such that all calls comprising the same number of digits and the recorder-sender or other circuit continues to operate as soon as the full complement of digits has been received. In other cases, the number of digits varies from call to call and it is necessary to indicate when all the necessary ones have been recorded.

   This signal serves this purpose and although it is superfluous in the first case, it is always transmitted in order to avoid walking complications. When

  <Desc / Clms Page number 124>

 the recorder-sender or other circuit is arranged to accept this signal, the receiver circuit operates in the same way as for digit pulses except that it earths the E and F conductors 3296 and 3297.



  When the recorder-sender or other circuit does not need the signal, arrangements are made to prevent its reception so that it cannot interfere with the rest of the call. In either case, the battery is subsequently removed to restore the receiver circuit to normal.
 EMI124.1
 



  REGISTER IEKT OF RECORDER-SENDER.



   ----------------------------------------
When the digit signals are successively transmitted by the long distance operator by lowering the keys of the keypad 1108 in accordance with the area code and the number to choose an outgoing junction and establish a telephone call, the receiver circuits (Fig. 32). ) react to activate two / relays of pulses A to F at each key stroke. Two of the relays 3307, 3308, 3309, 3310, 3311, 3312 are actuated in response to the operation of each key, according to the frequencies of the two signals transmitted.

   These relays are actuated according to the combinations given below, in response to the operation of the keys and to the corresponding effect in the receiver circuit, which connects the earth to the conductors as shown for the operation of the recorders of the recorder. -entry associated by the director relays.
 EMI124.2
 
 <tb>



  Figure <SEP> Relay <SEP> activated: <SEP> Conductors <SEP> put <SEP> to <SEP>: <SEP> Recorders <SEP>
 <tb>
 <tb> potential <SEP> of <SEP> the <SEP> ter- <SEP>: <SEP> actuated
 <tb>: <SEP>: <SEP> re <SEP>: <SEP>
 <tb>
 <tb>
 <tb> O <SEP> 3307.3308 <SEP> 2740
 <tb>
 <tb> 1 <SEP> 3307.3310 <SEP> 2740.2741 <SEP>: <SEP> n <SEP> 1
 <tb>
 <tb> 2 <SEP> $ 330, 3310 <SEP> 2740.2742 <SEP>: <SEP> n <SEP> 2
 <tb>
 
 EMI124.3
 3 3310.3311 270.271.272. n 1 and 4
 EMI124.4
 
 <tb> 4 <SEP> 3308.3311 <SEP> 2740.2745 <SEP>: <SEP> n <SEP> 4
 <tb>
 <tb>
 <tb>
 <tb> 5 <SEP> 3309.3310 <SEP> 2740.2744 <SEP>: <SEP> n <SEP> 5
 <tb>
 <tb>
 <tb>
 <tb> 6 <SEP> 3307.3309 <SEP> 2740.2741,2744 <SEP>: <SEP> n <SEP> 1 <SEP> and <SEP> 5
 <tb>
 
 EMI124.5
 7 3308,3309 ', 740J27422744: n 2 and 5 8 3309,3311 274Q2741,2742,2744:

   n l, 2 and 5
 EMI124.6
 
 <tb> 9 <SEP> 3307.3311 <SEP> 2740,2744,2745 <SEP>. <SEP> n <SEP> 4 <SEP> and <SEP> 5
 <tb>
 <tb> Final <SEP> 3311.3312 <SEP> 2740,2741,2745 <SEP> n <SEP> 1 <SEP> and <SEP> 4
 <tb>
 

  <Desc / Clms Page number 125>

 
To control each period of pulse time relays 3300 and 3301 are provided. Operation of relay 2805 provides a circuit for relay 3300 (polarized) comprising: battery on contact 3 of relay 2403, contact 2 of relay 2805, conductor 2845 through the top winding of this relay, resistor 3302 and earth. , and through its lower winding by the contact of relay 3301, the conductor 3298 and the contact of relay 3267, to earth. This circuit keeps the contact of relay 3300 closed.



  As said earlier, when relay 3259 in the signal presence circuit is operating, ground from its contact extends over conductor 3290, the contact of relay 3300, returning to the receiver circuit on conductor 3291 to establish a circuit for the impulse relays so that those chosen by the keys of the keyboard 1108 can function. Normally, as shown above, there are two channels of the receiver circuit implemented to actuate two pulse relays for each digit, which relays likewise establish circuits for relays 3261 and 3267 and transmit signals to two of the relays 3307. to 3312 as shown in the table above.

   Operation of relay 3267 removes earth from conductor 3298 passing through the lower winding of pulse counter relay 3300. A circuit is established for relay 3301 comprising: the battery, the coil and the contact of this relay, the conductor 3299, relay contact 3261, conductor 3291, relay contact 3300, conductor 3290, relay contact 3267 and earth. Relay 3301 is then blocked by conductor 3290 to ground applied to the contact of relay 3267. Operation of relay 3301 also opens conductor 3298 going to the lower winding of pulse counter relay 3300.

   When earth is removed from the lower winding of relay 3300 by the operation of relay 3267 the capacitor 3343 connected to this winding begins to charge, creating an opposing circuit in the en-

  <Desc / Clms Page number 126>

 lower secondary bearing of relay 3300, which neutralizes current in the upper primary winding until capacitor 3343 is charged. The current in the lower secondary winding decreases as charge builds up in the capacitor and as a result the energy in the upper primary winding becomes relatively greater than the energy in the lower winding. - secondary laughter and at this moment the armature of relay 3300 is moved to open its contact.

   The combination of relays 3300 and 3301 and capacitor 3343 is designed in such a way that relay 3300 will not open its contact until a sufficient period of time has elapsed for the operation of the logger relays (Fig. 31 and 35) and the operation of the director relays to advance the pulse system to the next recorder. Pulse counter relays 3300 and 3301 release the receiver circuit pulse relays which release transducer relays 3307 to 3312 and relays 3261 and 3267. Releasing relay 3267 - earths the secondary winding of relay 3300 through conductor 3298. This causes relay 3300 to immediately close its contact.

   Relays 3300 and 3301 are thus activated and released when the signals for each digit are received by the receiver circuit (Fig. 32) to control the timing of the circuits established to operate relays 3307 to 3312 and for setting the recorder circuits which are established by relays 3307 to 3312.



   As shown in the previous table, the co-combinations of two relays which are activated for the different digits connect the earth to the conductors 2740, 2741, 2742, 2744 and 2745 extending to the recorders and to the director circuit shown in Figs. 30, 31 and 35. The director circuit advances the conductors from recorder to recorder after

  <Desc / Clms Page number 127>

 Each recorder setting and thus the recorders remain the same as described here for DC pulses.

   It will be remembered that these same conductors are connected to the contacts of relays 2404 to 2409 which are activated by direct current pulses for the control of the recorder-collector on these conductors. In the different loggers, the logger relay n 1 is activated when the earth is connected to the conductor 2741, the logger relay n 2 when the earth is connected to the conductor 2742:

   recorder relay # 4 when earth is connected to lead 2745, and recorder relay # 5 when earth is connected to lead 2744. As shown in the previous table, two of the above relays are connected to earth for numbers 3, 6, 7, 9 and the final number, and three conductors are connected to earth for number 8.



   MARKER SELECTION
When describing the adjustment of the recorders (Fig. 31 and 35) by direct current pulses it has been said that the connection of the earth to the conductor 2853 by the relay 2701 causes the operation of all the direction relays 3001, 3100. , 3006, 3105, 3008, 3113, 3010, 3500, 3012, 3506, and all intermediate director relays not shown and these relays are successively released in pairs as each digit is recorded. The release of a predetermined number of director relays establishes a circuit for relay 2508 to obtain the services of a marker, this circuit being established according to the number of digits used for: the code.

   A circuit for the marker start relay 2508 is shown, starting from the two relays 3105 and 3113 to show how to set this circuit either on conductor 3132 or on conductor 3133, depending on the method. layout employee. Assuming that the circuit of relay 2508 is established on release of the

  <Desc / Clms Page number 128>

 directing relay 3113, it can be followed as follows: battery, winding of relay 2508, conductor 2551, contact 1 of relay 3506, contact 2 of relay 3105, conductor 3133, contact 3 of relay 2300, contact 3 of relay 2305 , conductor 2342, contact 2 of relay 3407, conductor 3450 and earth applied to contact 8 of extra-normal relay 3000.

   Operation of relay 2508 releases relay 2506 which was previously capable of being earthed by conductor 3450 on contact 8 of relay 3000 (in Fig. 30, contacts 9, 10, 11 of the 3000 relays go to other circuits of recorders). The operation of relay 2508 likewise establishes a circuit for relay 2500 comprising battery, winding of the latter relay, conductor 2552, contact 1 of relay 2603, conductor 2643, contact 3 of relay 2508, contact of relay 2506, relay 2403 contact 1, relay 2410 contact 1 and earth.

   Relay 2500 connects the battery, from its contact 1, to the marker connector, through contact 4 of relay 2501, conductor 2553, contact 1 of relay 2602, contact 1 of relay 2601, to con- tact. 2645 connector start driver - The sending recorder has access to two connectors, a preferred connector and another connector between the recorder-sending and the marker selection mechanism. If the preferred connector is occupied, relay 2601 is actuated and the transceiver automatically uses the other connector by connecting the battery to lead 2645 instead of lead 2645.

     Grounding the / in connector with lead 2647 to put relay 2601 to the battery through contact 2 of relay 2508 and resistor 2507 gives the recorder-sender access to a marker through the auxiliary channel. :, after choosing a marker, the earth is connected to conductor 2765 which activates relay 2707 to connect the category recording conductors 2747 to 2759 of the junction

  <Desc / Clms Page number 129>

 by crossing the recorder-sender to the yard marker register the type of junction in the marker. After recording of the category information by the marker, relay 2707 drops out.



   A call; left by the operator of the call order table, using the trunk, Fig. 29, would have actuated relay 3400. As described above and therefore conductors 3440, 3441, 3442 and 3443 are now connected to the marker. Conductor 3440 extends the earth from contact 1 of relay 2803 which was actuated by the junction circuit to give a long junction indication. Driver 3441 is for TX call control.

   Conductor 3443 is used by the marker as described later to control the recorder-sender mechanism for transmitting alternating current pulses to a remote office and conductor 3442 connects ground to the command relay d. 'calls of the marker designated 307 in FIG. 3 to control this relay to restore normal route relay functions when a trunk code is registered for a group connected for call-to-hold order binding.



  Op can put in the recorder-sender up to five code recorders, but only three records are transferred to the three recorders of the marker for the office code. A three-digit code can be stored in recorders A, B and C of the recorder-sender and transferred to recorders A, B and C of the marker. A four-digit call sign can be stored in recorders A, B, C and D of the recorder-sender and the records of recorders B, C and D of the recorder-sender be transferred to the marker, the record A giving the marker a signal that a four-digit callsign has been recorded.

   Long distance TX calls are recorded on five recorders in the sender-sender recorder, the first two recorders being

  <Desc / Clms Page number 130>

 the one and the one. Thus the recordings of recorders A and B of the recorder-sender transmit to the marker a signal signifying that a TX code has been recorded. The recordings on the recorder-sender CD and E recorders are transferred to the three recorders of the marker. In response to the recordings and signals received by the marker, a route relay is activated or controlled as described herein with respect to Figs. 3, 4 and 5.



   SIGNALS FROM THE MARKER TO THE RECORDER-SENDER.



   ------------------------------------------------
After the marker has determined from the recorded callsign what type of outgoing call is requested and the route relay has been activated, signals are returned to the recorder-sender to control further operations. in the recorder-sender. The marker transmits this information to the recorder-sender by connecting the earth to the conductors according to the table below to activate the corresponding relays which are given in this table.
 EMI130.1
 
 <tb>



  Driver <SEP> put <SEP> to <SEP> the <SEP> Relay <SEP> activated <SEP> Relay Call <SEP>
 <tb> earth
 <tb>
 
 EMI130.2
 2545,2861 2501,2gl0 Manual call 2545,2É61,2546 25U1,210,2503 Manual call, ring
 EMI130.3
 
 <tb>: <SEP>: <SEP> tion Outgoing <SEP> <SEP> long
 <tb>
 <tb> 2545 <SEP> 2501 <SEP> Call <SEP> of <SEP>: <SEP> salector <SEP> full, emitted-
 <tb>: sion <SEP> of pulses
 <tb>; from <SEP> current <SEP> continuous
 <tb> 2545, <SEP> 3443 <SEP> 2501.2913 <SEP>: Call <SEP> of <SEP> selected
 <tb>: <SEP>: <SEP> tor <SEP> full,
 <tb> broadcast Impulse <SEP>
 <tb>: <SEP>: <SEP> sions <SEP> of <SEP> current
 <tb> .. Alternative <SEP>, <SEP>
 <tb>
 
 EMI130.4
 2545,2546 2501,2503 Selection call
 EMI130.5
 
 <tb>: <SEP>:

    <SEP> tor <SEP> full,
 <tb>
 <tb>
 <tb> .. <SEP> junction Outgoing <SEP>
 <tb>
 <tb>
 <tb>
 <tb> long
 <tb>
 
 EMI130.6
 J) ïJ Grl 'UL 3uR'l'Al \ TE; We suaposero for the bpscins of the following description

  <Desc / Clms Page number 131>

 claims that the marker has been given a call sign to select an outgoing junction arranged for AC pulses to a remote office having a recorder-sender arranged to receive AC pulses.



  The marker, therefore, will ground conductors 2545 and 3443 to actuate relays 2501 and 2913 according to the table above. A marker for this type of selection is shown schematically in FIG. 21 as marker 2110. This marker chooses a junction from the records as described in connection with Figs. 3, 4 and 5 and this junction can be taken at the outgoing junction (Fig. 22) which is a junction by a group of junctions going to the office lead. Conductors such as 2240 and 2241 coming from all the junctions of the group are connected at / junction relay block 2215 and conductors such as 2242 and 2243 are connected from junction block relays to marker 2110.

   The conductors 2242 and 2243 can be common a number of markers with which a junction can be associated. The operation of the terminal block relays is controlled by the feeder relay and the marker block relay control mechanism to link a particular group of junctions to the marker. The marker choosing an outgoing junction tests the junctions of the group of junctions designated by the feeder relay and chooses a free junction if any according to this test. A free-junction group is indicated by ground on conductor 2240. This conductor as shown is connected through the block relay to conductor 2242 going to the marker.



  The marker then tries conductor 2241 going to the junctions of that group to pick up a free junction circuit there. The absence of earth on conductor 2241 denotes that this junction circuit is free but the marker also tests conductor 2241 for the presence of the battery which goes,

  <Desc / Clms Page number 132>

 through the upper winding of relay 2219, contact 5 of relay 2217, contact 1 of relay 2200, contact 3 of relay 2216, conductor 2241 and all similar conductors of free junctions, passing through the block relay of junctions, to conductor 2243 going to the marker.

   After this test the marker applies the earth potential to this conductor to actuate relay 2219. Operation of relay 2219 performs the following functions: (1) it grounds on conductor 2244 at the attenuator and repeater circuit to control this attenuator and repeater circuit if a repeater is required. (2) it removes the earth from conductor 2246 and puts the battery on this conductor, the circuit varying from the battery through the lamp 211108, the contact 2 of relay 2207, contact 1 of relay 2219, to conductor 2246 which is conductor 1.1 of the signaling circuit Simple:;: associated with relay 2218.

   This battery connected to the simplex signaling circuit activates a relay similar to the remote office 2230 to warn the distant office that an incoming recorder-sender such as will be connected to this particular outgoing junction (3) the relay 2219 also activates the relay 2217 via its contact 4, and (4), it removes the earth supplied to the group occupant conductor 2240 so that the group occupancy mechanism will operate if this is the last free junction to be chosen from the group. dRelay 2217 is blocked to earth via its contact 4.

   The operation of the remote office signaling relay which is the same as relay 2218 associates a ground with an automatically adjusted mechanism which then sends a signal back to conductor 2236 to actuate relay 2218 which remains actuated until such time as the remote office 2230 inbound logger-sender 2230 is ready to receive pulse current signals
 EMI132.1
 alternative. The land of zonta, .ct-, of Fêlais 22 17 / pi-G î ong-e by

  <Desc / Clms Page number 133>

 the simplex signaling conductor 2247 E which puts a shunt on the relay 2216 until the moment when the recorder-sender 2233 is ready to receive pulse signals; Relay 2218 is then released, removing shunt earth from relay 2216.



  * As soon as the marker has chosen the outgoing junction and made this junction busy for other markers, connectors 2108 and 2109 are activated in a known manner. The location of the frames or racks on which switches 2100 and 2103 are located is indicated to the marker mechanism and a channel is found through secondary switches 2101 and 2102. After that channel has been found, switches 2100 , 2101, 2102 and 2103 are actuated, thus connecting the junction (Fig 21) to the junction (Fig. 22). Following this switch control operation, the marker connects earth to conductor 2545 which actuates relay 2501.

   Operation of relay 2501 on receipt of a signal from the marker connects the earth of contact 3 of relay 2810, through contact 1 of relay 2501, contact 2 of relay 2300, upper winding of relay 2710 , from contact 3 of relay 2709, contacts 1 and 3 of relay 2707, which was released by the marker, then contacts 2 and 5 of relay 2701 and contacts 1 and 4 of relay 2700, to conductors 2350 and 2353 going to the junction circuit (Fig. 20).

   Since relay 2018 is actuated, this circuit goes through conductors 2060 and 2061, switches 2100, 2101, 2102 and 2103 to conductors 2.53 and 2254 from where through the upper and lower windings of coil 2201, the upper windings and through relay 2200, contact 2 and the coil of relay 2216, resistor 2225, to the battery.

   If at this time the simplex relay 2218 is released, indicating that the recorder-sender 2233 has been connected to the outgoing junction, the earth shunt has been removed from the relay 2216 and a

  <Desc / Clms Page number 134>

 Circuit is established to operate recorder-send relay 2710. Due to the high resistance of the upper coil of relay 2710, junction relay 2216 does not operate at this time. The operating relay 2710 establishes a circuit for the relay 2809 which trips and connects the lower winding of the relay 2710 in parallel with its upper winding, thereby reducing the resistance of the circuit to the relay 2216.

   This causes the outgoing trunk relay 2216 to operate, which returns a signal to the logger-sender as described below.



   The moment switches 2100, 2101, 2102 and 2103 are actuated, the marker connects the earth to conductor 2250 which keeps relay 2219 activated through contact 5 of relay 2217. This earth also goes through contact. 1 of relay 2200, contact 3 of relay 2216 and conductors 2241 and 2243 to the marker as a signal that the switches have been operated correctly. The marker also indicates at the junction whether or not a repeater should be inserted in the transmission conductors.

   If the outgoing junction is a long junction and the incoming junction is a long junction, indications are given to the marker and the marker connects a high voltage, passing through conductors 2251 and 2252, coil windings 2210, windings from relay 2209, contact 1 from relay 2217 to conductor 2245 extending through the repeater switching circuit, which produces the selection of a repeater and the production of that repeater in the transmission paths of, ;anointing. As previously described, operation of relay 2800 reduces resistance in series with junction relay 2216, causing it to operate.

   Relay 2216 when operating establishes a circuit

  <Desc / Clms Page number 135>

 blocking for itself to the earth applied to contact 2 of relay 21:17. Conductor 2241 to the terminal block relays is grounded to indicate the busy state of the junction. Relay 2216 opens its control circuit which disconnects the circuit from relay 2710, causing it to release. Operation of relay 2215 further links the simplex conductor E 2247, through resistor 2214, to simplex conductors 2253 and 2254 for monitoring purposes after communication has been established.

   Operation of relay 2218 from remote office 2230 will transmit a supervisory signal over conductors 2253 and 2254 to the originating trunk position.



   In the table under the subtitle "Signals from the marker to the recorder-envcyeur" it is marked that the marker connects the earth to the conductor 2861 to activate the relay 2810 when the call is for a manual switch panel . The operation of relay 2810 prevents the operation of relay 2300 to prevent pulses being sent to the outside by the recorder-sender, if the digital recorders were set. Relay 2810 also causes relay 2709 and other relays to operate in sequence to release the recorder-sender as will be described below.

   This would be what would happen if a long arrival junction were automatically directed to a junction 151, Fig. 7A, after transmission of pulses on the incoming junction for a group which has been made essential by its connection to the waiting utterance circuit. In this case digital digits have been stored in the recorder-sender for transmission on the desired outgoing trunk, but these pulses are not transmitted on trunk 151 of the call order table.

  <Desc / Clms Page number 136>

 
 EMI136.1
 



  Pii3iPiiRÀ "ï <3ii DE L '.i.] R; GJ :: Sr1'R [JJR-E: VOYl.!;' FOR THE EMISSION OF TP¯1'¯LS-i> î, S TO THE EXTERIOR.



   --------------------------------------------------
The recorder-sender is designed for the transmission of DC pulses to an outgoing junction, relay 2813 normally being released, and for the transmission of AC pulses to a recorder.
 EMI136.2
 trei:, r-envoy; elois office: .n.l, relays 2 to 13 and others working.

   The callsign stored in the marker and therefore the feeder relay actuated in the marker causes the selection of an outgoing junction to a remote office arranged in either case for direct current pulses and in the another case for alternating current pulses, and also controls the recorder-transmitter to transmit direct or alternating contact pulses by keeping certain relays normal or causing them to operate.

   When the callsign stored in the marker is to bring the selection of an outgoing junction to a desk requesting alternating current pulses, the marker actuates a relay which grounds conductor 3443 shown at the upper left of the unit. Fig. 34, which activates relay 2913. A blocking circuit is established for relay 2913 through its contact 2, conductor 2940, contact 4 of relay 2810, conductor 2850, contact 3 of relay 2501, to earth.

   Relay 2913 establishes a control circuit for relays 2813 and 2818 which prepares the recorder-sender for transmitting alternating current pulses when other devices of the recorder-sender have been operated. It is recognized that recorders and manager relays must be properly regulated and that a signal must be received from the outgoing junction before pulse transmission takes place.



     In preparation for the pulse mechanism, relay 2710

  <Desc / Clms Page number 137>

 is released by outgoing junction relay 2216 to show that the remote sender has been connected and is ready to receive pulses. Releasing relay 2710 causes relay 2300 to operate in a circuit comprising: the battery, the winding of relay 2300, contact 2 of relay 2709, contact 1 of relay 2810, contact 2 of relay 2809, contact of relay 2710, conductor 2876 and the earth applied to contact 6 of relay 2501. Operation of relay 2300 causes relay 2700 to operate via a circuit comprising:

   the battery, the winding of this relay, contact 1 of relay 2300, contact 1 of relay 2501, and earth applied to contact 3 of relay 2810. Note that the circuit for these relays includes a contact of relay 2501 which is activated by the marker after it has established communication from the outgoing junction to the recorder-sender through the cross-bar switches (Fi '. 21) and likewise the preceding circuit includes a contact of relay 2710 after it has been released by the operation of the outgoing junction relay 2216.

   With relays 2700, 2813 and 2818 activated, the pulse transmission leads are now closed from the remote recorder-sender 2233 on the four-wire circuit through the outgoing junction (Fig. 22). , the switches (Fig. 21), the incoming junction (Fi.20), conductors 2350,2351, 2352 and 2353 going to the recorder-sender circuit, and contacts 1, 2, 3 and 4 of relay 2700. Conductors 2730, 2731, 2732 and 2733 run from inner contacts 1, 2, 3 and 4 of relay 2700 to the repeater coil shown in Fig. 28.

   Conductors 2730 and 2731 go through contacts 1 and 3 of relay 2813 to windings 2819 and 2820 of the repeater coil. Conductor 2732 goes from contact 1 of relay 2709 to contact

  <Desc / Clms Page number 138>

 2 of relay 2818 and winding it: slow 2825 of the repeater coil, and the driver 2733 goes from contact 4 of relay 2708 to contact 6 of relay 2818 and to winding 2826 of the repeater coil. The output circuit is thus prepared for the reception of pulses from the recorder-sender for setting the registers of the remote recorder-sender 2233.



   DIRECTOR RELAYS -----------------
The master relay to control the transmission of pulses for the first digital digit is the one immediately following the last master relay released when these loggers are set for the code digits. For this description it will be assumed that the last code digit was stored on the release of the directing relay 3105. As stated herein, the release of the relay 3105 establishes a circuit for the relay to turn on the marker 2508 on a circuit comprising earth, contact 3 of relay 2300 normal, contact 2 of relay 3105, contact 1 of relay 3506, winding of relay 2508 and the battery.

   Operation of relay 2300 as noted above transfers this earth to conductor 2348 which, through contact 1 of the pulse-emitting relay 3500, goes into the winding of the pulse-emitting relay. 3112 and the winding of the pulse emitting relay relay 3007, to the battery.

   Relay 3112, when operating, connects the contact of the recorder relays associated with conductors 2870, 2871, 2872 and 2873 and therefore no one of the actuated recorder relays will circuit on drivers associates;

  ! connect the earth to. these. These conductors go through contacts 4, 5, 6 and 7 of relay 2813 to the windings of the pulse emission control relays 2903, 2902, 2904, 2906 and 2907 and therefore the relay

  <Desc / Clms Page number 139>

 It or the relays of this group are functioning, which correspond to the actuated recorder (s) associated with the pulse emission directing relay 3112 or to the registers associated with other gradually actuated pulse emission directing relays. Alternating current sources of different oscillator frequencies (Fig.

   15) are connected to the contacts of the previous number pulse transmission control relays and these relays are now set to transmit the first digit to recorder-sender 2233 and will do so as soon as the recorder-sender has been fully prepared by bonding the pulse emitting conductors to the junction line.



   The operation of the pulse emitting relay 3007 establishes a circuit for the relay 3407 comprising the battery, the coil of this relay, the conductor 3455, the contact 2 of the relay 3007, the relay. contact 8 of the extra-normal relay 3000 and earth. This earth also establishes a holding circuit for relays 3007 and
3112, Relay 3407 locks to earth applied to conductor 3450. Relays 3408 and 3406 are now operating. Relay 3408 operates by the circuit comprising the battery, the coil of this relay, contact 3 of relay 3407, conductor 3457, contact 5 of relay 3506, conductor 2756, contact 1 of relay 2706 and Earth.



   Expansion of this circuit through contact 5 of relay 3506 prevents pulsing to the outside from starting before the pulses inside are finished, since relay 2506 is released after recording the signal. last digit. Relay 3406 operates on a circuit comprising the battery, the coil of this relay, the conductor 3458, the contact 5 of the relay 2810, the conductor
2888, the contact of the polarized pulse counting relay

  <Desc / Clms Page number 140>

 3401, conductor 3459, contact 2 of relay 2914, contact 1 of relay 3407, conductor 3346, contact 3 of relay 3000 and earth. As will be seen in the following, the circuit of relay 340b depends on the position of the contacts of the pulse counting relay 3401.

   Relay 3410 operates through a contact of relay 3408 on a circuit including the battery, coil of relay 3410, conductor 3454, contact 5 of relay 2700, conductor 2775, contact 2 of relay. relay 2813, relay contact 1 of relay 3406, relay contact 2 of 3408, conductor 2753, and earth applied to contact b of relay 2701. Relay 3410 locks to earth on conductor 2753.



   PULSE ACCOUNTING RELAY
 EMI140.1
 -------------------------------
The 3401 pulse counting relay is a relay without polarization as to the direction of the current, that is to say working in any direction, time-regulated by a capacitor and polarized in that the direction of movement taken by the reinforcement depends on the direction of the current.



  One cannot say that it is working or falling but it closes its contact 2 when it is excited in one direction by its primary or lower winding, and closes its contact 1 when it is excited in the other direction. by its primary winding. It stays on either or no contact when it is / not excited. When current first passes through the primary winding in one direction or the other, its force is neutralized by an opposing current in the upper or secondary winding, the source of which is the load or the discharge. of the time counter capacitor 2919.



  When the capacitor has been charged or discharged current stops flowing in the secondary winding and current in the primary winding causes the armature to move from one contact to another.

  <Desc / Clms Page number 141>

 



   The operation of relays 3406 and 3408 establishes circuits for this pulse counting relay whose armature moves from contact to contact under the control of capacitor 2919 to actuate and release relay 3406 to transmit the signals. combinations of currents of various frequencies which actuate the receiver mechanism associated with the remote recorder-sender 2233.



  The circuit for relay 3406 went through contact 1 of relay 3401, which is the case when the armature is connected to this contact. This is the normal position of the frame after the recorder-sender has been put into service since the capacitor 2919 is discharged when earth is associated with it by the operation of the extra normal relays of the recorder. sender. The armature being connected to its contact 2, a network circuit is established, comprising the resistors 3402, 3403, 3404 and the capacitor 2919. This generates currents applied in the two windings of the relay 3401 of comDtae. of pulses.

   First the effect of the upper secondary winding is stronger and contact 2 is kept closed but when the capacitor discharges the current in the secondary winding decreases until the effect of the lower primary winding becomes stronger. At this moment the relay opens its contact 2 and closes its contact 1 which removes the earth, via the armature, from the network circuit. Therefore, current flow begins in both the upper and lower windings in opposite directions from those previously followed.

   First the effect of the secondary winding is stronger and the contact 1 is kept closed but when the capacitor charges, the current in the secondary winding decreases until the effect of the primary winding. becomes stronger and at this time

  <Desc / Clms Page number 142>

 The relay opens its contact 1 and closes its contact 2. This cycle continues to regulate the transmission of the digits for the time 20 until the relays mentioned above drop out.



   CURRENT OUTPUT PULSES TRANSMISSION
ALTERNATIVE.



   ------------------------------------------
As described above, relay 3410 operates in response to the first operation of relay 3406 and so does. closes the pulse leads to tune the remote receiver circuit in preparation for the digit pulses. Currents of two frequencies, which can be 1500 and 1700 cycles from the current supply oscillators (End: - 15) are transmitted first on the conductors 2950 and 2951 via contacts 1 and 3. relay 2910, this relay being normally released.

   The circuit includes: conductors 2950 and 2951, contacts 1 and 3 of relay 2910, conductors 3452 and 3453, contacts, 'and 3 of relay 3410, contacts 2 and 3 of relay 3406, conductors 2877 and 2878, the lower terminal of the winding 2824 of the repeater coil 2816 and the upper terminal of the winding 2823 of this repeater coil. The currents of the two frequencies are transmitted on the conductors 2732 and 2733 by one of the four-wire channels and on the conductors 2730 and 2731 on the other four-wire channel. The transmission of these currents on the two channels balances the circuit on these channels.

   The first operating: slow of relay 3406 also connects the earth of contact 1 of relay 3410, passing through contact 5 of relay 2910, the winding of relay 2912, to the battery activating rela.is 2912 and putting a shunt on winding of relay 2910. This keeps relay 2910 normally released while transmitting currents on conductors 2950 and 2951.

   At the release

  <Desc / Clms Page number 143>

 failure of relay 3406 this shunt is removed and relay 2910 operates in a circuit including earth, contact 3 of relay 2501, conductor 2550, contact 4 of relay 2810, conductor 2940, contact of relay 2912, windings relays 2910 and 2912 and the battery. The relays 2910 and 2912 remain actuated during the transmission of the run impulses.

   The operation of relay 2910 connects the contacts of the digit transmission control relays 2900, 2902, 2904, 2906 and 2907 with the pulse circuit as tracked by passing through the contacts of relays 3405 and 3410 to the onrou- elements 2823 and 2824 of the repeater coil. The second subsequent operation of relay 3406 advances the directing relays (Fig. 30, 31 and 35) to the next recorder by connecting the earth, through its contact 4, to contact 5 of relay 2910, to the conductor 2874, in contact with the director relay 3005 and going to the various director relays while the outward pulses progress from one recorder to the next associated with the various director relays.

   With each progressive operation of the director relays, the conductors 2870, 2871 2872 and 2873 are opened and advanced to the next logger which releases the digit control relay (s) 2900, 2992, 2904, 2906 and 2907 and again actuates one or several of these relays to transmit the next digit each being current of two frequencies for each digit, as follows:

   
 EMI143.1
 
 <tb> Figures <SEP> Conductors <SEP> Frequencies <SEP> of
 <tb>
 <tb>
 <tb> signals
 <tb>
 <tb>
 <tb>
 <tb> Signal <SEP> KP <SEP> 2950.2951 <SEP> 1500-1700
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> Figures <SEP> Relay <SEP> Frequencies <SEP> of
 <tb>
 <tb>
 <tb> ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯signals¯¯¯¯¯
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 0 <SEP> 700-900
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 1 <SEP> 2900 <SEP> 700-1300
 <tb>
 

  <Desc / Clms Page number 144>

 
 EMI144.1
 
 <tb> 2902 <SEP> 900 <SEP> 1300
 <tb>
 
 EMI144.2
 3 2900.2902 1300-1500
 EMI144.3
 
 <tb> 4 <SEP>: <SEP> 2904 <SEP>:

    <SEP> 900-1500
 <tb>
 
 EMI144.4
 5,905,; go7 noo-1300 6 2OJ, 9U5, É? Y0'7 70D-1100 7 2902,2906,2907 900-noo 8. 2900,2Oa, .9U5, ao l100-15G "J 2904,2906,2907 700-1500 sir 9;:,. 90 .. 110-l700
The signal that the pulses are complete is transmitted by the operation of relays 2900 and 2904 as shown in the table, which also establishes a circuit for relay 3405 during the time that relay 3406 is actuated. The circuit for relay 3405 includes: earth, contact 1 of relay 3410, contact 4 of relay 3406, contact 7 of relay 2904, contact 5 of relay 2900, contact and winding of relay 3405 and drums .

   Relay 3405 while operating locks to earth on conductor 2753 and also opens the conductor from contact 2 of pulse count relay 3401. Consequently, capacitor 2919 remains charged and relay 3401 will stop pulsing, its armature returning against contact 2. Relay 3406, therefore, remains released.



     RELEASE OF THE RECORDER-SENDER.



   ---------------------------------------
A circuit is thus established for relay 2709 comprising the battery, the winding of this relay, contact 4 of relay 2818, contact 1 of relay 3405; contact 4 of relay 3406, contact 1 of relay 3410 and earth.



  Operation of relay 2709 causes operation
 EMI144.5
 of the en1-egistr; ur-envoy> put ', tl' at this moment we -oeupp- assume that all the impulses have been transmitted and the

  <Desc / Clms Page number 145>

 recorder-sender service completed. Relay 2709 establishes a circuit - for relay 2798 which locks at relay 2400. Relay 2798 drops relays 2403 and 2402 and releasing relay 2402 releases relays 3000 and 2502 followed by releasing most of the mechanisms of 1 'recorder-sender. The relay 2018 of the trunk circuit is now, releases what connects the calling operator to the called operator.

   Releasing relay 2502 causes relays 2400, 2401 and 2708 to release, completing the. resetting the recorder-sender.



   DIRECT CURRENT PULSE EMISSION ----------------------------------------
If the call sign digits stored in the marker indicate to the marker that direct current pulses are required to actuate a remote recorder-sender, the marker chooses an outgoing junction of the moor type and signals to that outgoing junction that a outgoing recorder-sender must be chosen. The marker in this case does not associate earth with relay 2913 and therefore relays 2813 and 2818 remain normal.

   The relay 2813 being normal, the conductors 2870, 2871, 2872 and 2873 associated with the directing relays are connected through the intermediary of the contacts 4, 5, 6 and 7 of the relay 2813 to the windings of the relays 3411, 3412, 3416 and 3417. These latter relays are thus actuated by the digital digits which were arranged by the incoming pulses as described above under the control of relays 2404 to 2409 inclusive. The output of these relays is the earth and the battery of high and low resistance as listed in the following table for the setting of the loggers of the outgoing recorder-sender associated with the outgoing junction.

  <Desc / Clms Page number 146>

 
 EMI146.1
 
 <tb>



  Driver <SEP> 0 <SEP> 1 <SEP> 2 <SEP> 3 <SEP> 4 <SEP> 5 <SEP> 6 <SEP> 7 <SEP> 8 <SEP> 9 <SEP> F
 <tb> 3488 <SEP> L + <SEP> H + <SEP> L- <SEP> H- <SEP> L + <SEP> L + <SEP> H + <SEP> L- <SEP> H- <SEP> 14 <SEP> H +
 <tb>
 <tb>
 <tb> 3489 <SEP> L- <SEP> H + <SEP> H + <SEP> H + <SEP> H + <SEP> H- <SEP> H- <SEP> L-
 <tb>
 L + indicates high resistance earth, H + indicates direct earth, L- indicates high resistance battery, H- indicates low resistance battery.



   The combinations of earth and battery by crossing strong and weak resistances are transmitted for each digit on conductors 3488 and 3489 which go to the outgoing recorder-sender following contacts 3 and 5 of relay 2818 which is normal. , contacts 1 and 3 of relay 2910, conductors 3452 and 3453, contacts 2 and 3 of relay 3410, contacts 2 and 3 of relay 3406, conductors 2877 and 2878. Conductor 2877 is extended by contact 7 of relay 2818, contact 3 of relay 2811, contact 6 of relay 2818, conductor 2733, contact 4 of relay 2708, contact 3 of relay 2709, conductor 2351, junction
 EMI146.2
 arrival and departure, to the outgoing recorder.

   Conductor 2878 is extended by contact 1 of relay 2818, contact 1 of relay 2811, contact 2 of relay 2818, conductor 2732, contact 1 of relay 2709, contact 2 of relay 2700, conductor 2352, incoming and outgoing junction, to the outgoing recorder-sender recorders. Relay 3401 operates and de-energizes to count outgoing digit pulses as previously described which activates and releases relay 3406 to transmit those pulses and control the director relays in the manner described for AC pulses.

   When the pulses have been transmitted

  <Desc / Clms Page number 147>

 to adjust the recorders, a final pulse activates relays 3411 and 3416 which connect the earth, through contact 1 of relay 3410, contact 4 of relay 3406, contact 3 of relay 3416, contact 2 of relay 3411, l coil of relay 3405, to the battery, which actuates relay 3405 the way it was actuated by relays 2901 and 2904. This establishes a circuit through relay 2709,

   which triggers the release of the recorder-sender. As an example of the usefulness of the registrar-sender as a debit regarding the call order table it can be assumed that a call from an operator of the trunk table 600 was made on the trunk. ingress, Fig. 6, that this junction was automatically linked to recorder-sender 636, which is the same as shown at Fies.

   23 to 35, that a trunk code was transmitted by AC pulse from a keypad in an outside trunk position in trunk table 600 to set the registers of recorder-sender 636 and transferred to the recorders of the marker 700, that the group of outgoing trunks according to this call sign was in standby utterance and that the marker mechanism was automatically activated to choose a trunking 151, FIG. 7A, towards the call switch board and that the crcois bar switches were arranged accordingly, FIG.

     7. The call received an answer from the operator of the call order table, who, knowing that an outgoing link in waiting statement was requested to establish the communication, introduced file 567 in the jack 564 associated with the overflow circuit of this group of junctions and found that there is a free junction in this group. This is why she inserts the other twin plug of the cord circuit into the jacks of a jumper.

  <Desc / Clms Page number 148>

 tion, Fig. 20, which automatically associated another recorder-sender with it, FIG. 23 to 34.

   The recorders of this recorder-sender can then be regulated by direct current pulses and
The record transferred to marker 2110, which chooses a free junction, FIG. 22, signals the recorder-sender to transmit alternating current pulses to the recorder-sender 2233 to adjust the registers of the latter recorder-sender and actuates the crossbar switches, Fig. 21. A link between the outside toll operator at remote office 600 and the lower toll operator at office 2230 is thus established through a call order table cord circuit and two. sets of cross-bar switches.

   Another example of the call order table is where the call described above reached the operator of the call order table and a free trunk of the desired group was not available to establish the call. communication. In this case, a form is filled in by the operator of the call order table containing the information for the choice of a free junction to the desired office and the information to establish a call back, with an outside operator waiting for the calling long distance office when a free trunk is available.

   If the junction group is the object of many requests, the file is put together with other files for 'and; calls feed to the junctions of this group and the communication is established in the order of the calls received for the junctions of this group To establish a communication of this type, the call order table operator introduces one of the twin cards of the bead circuit, Fig. 8, in the outgoing 5 T jacks / Fig. 20, and this causes the selection of a recorder-sender, FIG.

   23 to 35 and

  <Desc / Clms Page number 149>

 a marker, which chooses a free junction to the desired office in the manner previously described, using the marker to choose a free outgoing junction to a remote long distance office, according to the call sign recorded in the recorder-sender by the call order table opera- tion. The other twin plug is then inserted into the outgoing jacks of another junction, Fi .20, shown schematically as junction 758.

   The code for this office and the number indicating the long distance outside operator waiting for this office is then entered by keys by the operator of the call order table to adjust the recorders of another. recorder-sender, Fig. 23 to 35, which is designated in the drawings as recorder-sender 757. Another free marker 756 is engaged to choose a free outgoing trunk 751 to the home office 750 and the calling subscriber is connected to the called subscriber of office 2230.
 EMI149.1
 



  CQ8'l? Àî.ÜIJ DU REPETEUH
In the first example where a communication was established from junction 151, Fi 7A, through the cord circuit of the call order table, and outgoing on the junction, Fig. 20 and Fig.



  22, indications are given to the automatic response mechanism of the call order table position circuit to record the type of junction connected to it and this automatic mechanism of the call order position circuit introduces or removes a voice amplifier repeater. In the description of the junction circuit 151, FIG. 7A, it will be recalled that after the switches 701, 702, 703 and 704 connect this junction, FIG. 7A, at the incoming junction, Fig. 6, relay 725 is actuated because the marker if the

  <Desc / Clms Page number 150>

 The incoming call from office 600 is a long trunk trunk lip.

   Relay 725 locks through its top winding to earth applied to contact 4 of relay 728 and connects the battery to the simplex circuit leading to the tip and neck springs of jack 723 and to the tip and neck conductors of plug 871. This long junction battery circuit consists of resistor 726, contact 2 of relay 725, winding of relay 721, upper and lower windings of delay coil 722, tip conductors and nape of jack 723 and plug 371, contacts 1 and ::

   of relay 802, conductors 836 and 837, contacts 1 and d. of relay 1026, contacts 1 and 2 of key 1004, delay coil 1000, coil of relay 1018, resistor 1027 and earth. Relay 1019 operates in the tracked circuit and establishes an obvious circuit for relay 1019.

   Another circuit is established comprising the battery, the resistor 731, the contact 4 of the relay 719, the coil of the relay 711, the upper and lower coil of the. delay coil 706, the tip and neck conductors to jack 724 and plug 870, contacts 1 and 2 of key 801 and contacts 5 and 6 of relay 802, conductors 834 and 835, contacts 4 and 5 of relay 1109 which is released, contacts 3 and 4 of relay 1006 activated, the left and right windings of the delay coil 1007, the winding of the relay 1013, the resistor 1026 and earth. Relay 1013 establishes an obvious circuit for relay 1014. Operation of relays 1018 and 1019 indicates to this mechanism that a long junction is connected to junction 15., Fig. 7A.

   Operation of relays 1013 and 1014 indicates that there is an incoming junction that is

  <Desc / Clms Page number 151>

 connected to this junction. In this example, the telephone circuit was established on the jo.-ction, Fig. 20. In the outgoing junction, Fig. 22, in the description of the recorder-sender and of the marker, it has been shown that the operation of the marker feeder relay will indicate whether the outgoing junction is a long or short junction.

   If it is a long junction, the marker thereby indicates to the recorder-sender by actuating a relay from the recorder-sender and the recorder-sender connects earth to conductor 2351, FIG. 20, after the 2018 relay has dropped, which activates the 2019 relay indicating that a long trunk trunk has been connected to it.

   This relay is blocked by means of its contact 2 to earth applied to contact 2 of relay 2021 and also connects the battery to the earth by actuating relay 1023, on a circuit which borrows resistor 2013, its contact 1 , the winding of relay 2Q03, the upper and lower windings of the 2002 delay coil, the tip and neck conductors of the 2025 jack, and the tip and neck conductors of the associated plug 820, the ' contacts 1 and 2 of actuated relay 815, conductors 845 and 846, contacts 1 and 2 of actuated relay 1009, contacts 1 and 2 of key 1010, left and right windings of delay coil 1003 , the coil of relay 1023 and resistor 1024. Relay 1023 establishes an obvious circuit for relay 1022.



   Since the junction, Fig. 20, is intended for outgoing service, there is no battery connected to the lower simplex branch and the lower plug 820.



  Therefore, relays 1016 and 1017 do not work.



  It is therefore indicated by the relays of FIG. 10 that the call order position circuit is connected to a long incoming junction and to a long outgoing junction.

  <Desc / Clms Page number 152>

 ford. Relay 1020, therefore, operates on a circuit comprising the battery, its coil, contact 2 of remake 1016, contact 3 of relay 1022, and earth applied to contact 7 of relay 901 in the telephone circuit. The relays 1013, 1014, 1018, 1019, 1020, 1022 and 1023 all remain actuated until the complete establishment of communication and until the operator of the call order table resets. at rest his conversation key 803.

   This releases the relays
802, 815 and telephone circuit relay 901. Remember that relay 1020 is activated on the earth applied to contact 7 and relay 901 but the relay
1020 is slow release and between the time relay 901 and relay 1020 are released a circuit is established to produce the selection of the repeater which will later be fed into the transmission circuit of the outgoing junction, FIG.

   22. For this purpose, the 130 volt battery 1062 has its positive pole extended automatically by a circuit comprising the lamp 1015, the contact 2 of the relay 1020, the contact 1 of the relay 1022, the contact 1 of the relay 1019, the contact 4 of relay 1014, contact 3 of relay 1016, contact 2 of relay 10 ?, conductor 849, contact 6 of relay 901, conductor 549, contact 8 of relay 815 which remains blocked on conductor 832 to earth applied to contact 3 of relay 1020 until this relay drops out.

   This circuit thus extends through the body of the lower plug and the socket of the 2026 jack, contact 6 of relay 2020, resistors 2010 and 2012, contacts 1 and 2 of relay 2011, upper and lower windings of the delay coil 2015, contacts 4 and 5 of relay 2018, conductors 2062 and 2063 by the crossbar switches, conductors

  <Desc / Clms Page number 153>

 coils 2251 and 2252, the upper and lower windings
Inside coil 2210 and relay 2209, the contact
1 of relay 2 '17, contact 3 of relay 2202, contact
2 of relay 2213, the lower winding of relay 2213 and earth, actuating relay 2213.



   Relay 2213, activated, causes the intro- duction of voice-amplifying repeaters in both the upper and lower channels of the transmission circuit to improve transmission for communication over a long inbound trunk league. and outgoing (note that its contact 3, by the wire
LKS goes to coupling).



   In the second example two communications were established on outgoing trunk circuits, one in each direction to the calling long distance office and to the called long distance office on trunks as shown in FIG. 20 and Fig. 22. It will be assumed that the two offices required long junctions and therefore that the relay 2019 for the two links is activated. From the above, it will be seen that the relays 1018, 1019, and 1022 and 1023 are thus actuated, but the relays 1013, 1014, 1016 and 1017 ae are not actuated.

   By establishing these two communications, the marker, knowing that these junctions are long by an indication given by the feeder relay, will introduce voice amplifying repeaters in the two outgoing junctions, Fig. 22, going to the two offices. Since only one voice-boosting repeater is needed, it is desirable that one of these voice-boosting repeaters be removed and therefore, when talk key 803 is reset, the positive pole of battery 1062 of
130 volts on.

   by lamp 1015, is connected by contact 2 of relay 1020, contact 1 of relay 1022,

  <Desc / Clms Page number 154>

 contact 1 of relay 1019, contact 3 of relay 1014, contact 2 of relay 1019, conductor 1033, contact 3 of relay 901, conductor 833, contact 8 of relay 802, conductor of plug 870 and jack 2026, which activates relay 2213 as previously described, if it is not already activated.

   Similarly, a negative pole of a 130 volt battery 1064 is connected by resistor 1021, contact 1 of relay 1020, contact 4 of relay 1014, contact 3 of relay 1016, contact 2 of relay 1022, conductor 1049, contact 6 of relay 901, conductor 849, contact 8 of relay 815, by the repeater switch in a circuit for automatic removal of the repeater from the transmission circuit.



   For calls of the above type made by a call order table operator, the cord circuit, Fig. 8, is used as a coupling in the four-wire transmission circuit through the cross-bar telephone office, relays 802 and 815 being released for the duration of the conversation between the two subscribers, except when the operator of the switchboard d The call order responds to monitoring signals. A signal from trunk office 2230 is received over composite signaling circuit conductor 2235 and 2236 which actuates composite signal relay 2218 and connects ground to conductor E 2247.

   This earth is extended through contact 1 of relay 2216, resistor 2214, the two upper windings of relay 2200, the upper and lower windings of the delay coil 2201, the conductors 2253 and 2254, the contacts of the switches to cross bars, conductors 2060, and 2061, contacts 1 and 2 of relay 2016, the upper windings

  <Desc / Clms Page number 155>

 and lower of the delay coil; slow 2021, the contacts of relay? 003, resistors 2007 and 2009, contact 3 of relay 1021, 1 T winding of relay 2004, to the battery, which activates the latter relay.

   Operation of relay 2004 opens the brittle circuit in the low resistance upper winding of the glow 2000, which ignites the blade 812 of the bead circuit. Intermittent opening and closing of the composite signal circuit above would flash. lampa 812. This lamp is normally off on the circuit passing through the upper and lower windings of relay 2000 to earth making the connection of the horn circuit to an active line. The bead circuit supervisor lamp 809 flashes as described for lamp 812.



   In response to a signal of this type, the operator of the call order table activates the conversation key 803 which associates the telephone circuit, FIG. 9, to the line conductors by energizing relays 802 and 815.



   The operation of the surveillance key with eavesdropping 804 bridges the surveillance with listening conductors of the telephone circuit, Fig '9, at the terminals of the four two-way wires to listen to conversations between subscribers without lowering the lines. transmission characteristics. Note that the conductors 841, 842, 843 and 844 go to the telephone circuit on the conductors 1041, 1042, 1043 and 1044. The conductors 1041 and 1042 passing through the windings 927 and 928 of the hybrid coil and the conductors 1043 and 1044 passing through the windings 924 and 925 of the hybrid coil.

   For monitoring with listening service, relay 931 is actuated and relay 901 remains normal.

  <Desc / Clms Page number 156>

 relay 931 is actuated on a circuit comprising the battery, its winding, contact 2 of relay 901, conductor 840 and contact 5 of the monitoring key with listening 804. The monitoring coils before listening to the telephone apparatus are connected, by the operation of relay 931, to the two channels of the transmission circuit.



   The operator of the call order table, on such occasions can give a signal either to the calling operator, or to the called operator, by manipulating key 801 or key 816. These keys can be actioned. - born and released to send a signal to the operator at the remote office. The operation of key 816 connects the battery to earth, which activates relay 2014, by a circuit comprising the tip and nose conductors, contacts 6 and 7 of relay 2018, contacts 2 and 3 of the relay. Relay 2022, the upper and lower windings of ba delay coil 2016, the relay winding 2014, resistor 2011 and earth.

   The operation of relay 2014 connects earth, through resistor 2005, contact 1 of relay 2014, the upper winding of the delay coil 2015, contact 5 of relay 2018, to conductor 2063 in the direction of the called office. The operation of relay 2014 also connects the battery, through resistor 2006, contact 2 of relay 2014, the lower winding of;

   delay coil 2015, contact 4 of relay 2018, to conductor 2062 in the direction of the called office. These circuits pass through the contacts of the cross-bar switches, conductors 2251 and 2252, the upper and lower windings of the delay coil 2210, and the upper and lower windings of relay 2209, actuating the latter relay.

   The operation of relay 2209 connects the earth, by its contact 1, and the winding of relay 22U7, to the battery which activates: 18 relays 2207 to open the circuit

  <Desc / Clms Page number 157>

 comprising the battery, the lamp 2208, the contact 2 of the relay 2207, the contact 1 of the relay 2219, and the conductor M 2236 of the composite signaling circuit going to the interurban office 2230. A relay, like 2218, of the office 2230 , is released by operation of relay 2207. At remote office 2230, this signal either flashes a lamp or applies ringing current, depending on the type of circuits at the remote office. The circuit for key 801 is the same as described for key 816 and operates a similar composite signaling circuit as shown in FIG. 6 in connection with the remote long distance office 600.



   A disconnect signal at the call order switch board is received by turning off lamps 809 and 812 in a manner previously described. Removing plug 820 from jacks 2025 and 2026 causes releasing of relay 2000. Releasing relay 2000 causes releasing of relay 2020 which automatically releases the relays of the junction circuit which were blocked on these two relays. of the earth of the conductor 2064 by this releasing of the relay 2021 returns to normal the holding magnets of the crossbar switches and also removes the earth of the conductor 2250 in the junction circuit, Fig.

   22, which causes the release of relay 2219, which was stuck to earth applied to conductor 2250. Releasing relay 2219 opens the composite signaling circuit going to the battery through lamp 2208 and allows the attendant at the 2230 office to disconnect. Relay 2219 also releases the repeater circuit switch by removing ground from conductor 2244. This relay also removes the discharge path of capacitor 2237 and allows the potential of this capacitor to rise to a point that triggers the tube. ionic 2221. This produces a current in the interval

  <Desc / Clms Page number 158>

 main, which is in series with the upper primary winding of relay 2217.

   This relay is differentially connected and retorts the flow due to the current in the primary upper winding is in opposition to that of the lower secondary winding and slightly above it, the relay 2217 is released. This turns off tube 2221 and releases relay 2216, which returns the circuit to normal and allows the circuit to give a free indication on conductor 2241, to the jumper block relay. Relay 2216, by dropping, also returns to ground on the group busy conductor, also extending to the terminal block relay.

   The time taken by the effect of the ion tube counter is sufficient to ensure that the circuit is relaxed. the far end of arrival before the circuit can be re-entered.



   DEFERRED CALLS ESTABLISHED BY OPERATORS SAKs COLDONS.



   -------------------------------------------------- -----
It has been said previously that there are periods when the call order table is not occupied by a team of operators and that under these conditions special positions without cords are used to: deferred calls.

   It has been said that under these conditions the key 550 is operated to automatically transfer the request calls from circuit 151 to a junction 121, FIG. 13, which ends in the call order switch table instead of ending in jacks in front of the operators of the call order table. It has been said that a deferred call card is filled in by the regular operator without cords who receives the call and when the call order table is not occupied the card is sent to this. special operator without cords having twin circuits with four wires,

   junctions A and B as shown in FIG. 17 (TA, TB there represent the junctions A and B and ITCC there designate the circuits of incoming junctions) connected to the two channels of the

  <Desc / Clms Page number 159>

 the position without cords, Fig. 18.

   (In Fig. 18, position channels A and B are referred to as PCA, PCB, and special operator position circuits without leads, as SCOP). The symmetrical junctions Shown at the right hand positions eb at the raucha hand. of Fig.

   17 are used by this special operator without cords to establish two calls, one on an outgoing trunk to a remote trunk office which was previously trying to establish a call and found all the trunks busy, and another call on the other- from these junctions to an outgoing junction, when free, to the desired long distance office.



   The special long distance position without cords for setting up different long distance calls has only one 1832 recorder-sender permanently connected to the position mechanism and therefore the records of this recorder-sender and a marker are first set to call. the operator in an office. long distance on one of the four-wire junctions, junction A or junction B, Fig. 17, and again to call the operator of the other long distance office on the other of the four-wire junctions, for example to call operators of offices 1,600 and 1905. With the exception of capacitor 1734 and relay 1713, the mechanism of the left and right junctions, A and B, is the same.

   It will be assumed, for example, that one of the position channels without cords is connected to junction A and that another position channel without cords of the same type of said position is connected to junction B. The automatically actuable mechanism of the position circuit without cables allows the release of the channels of the position circuit when communication has been established. Hand-operated position keys

  <Desc / Clms Page number 160>

 can be used for restoring and connecting one or the other channel at the option of the operator.



   The special operator without cords can first use the mechanism shown in Fig. 17, junction A, to establish a connection to the remote office
1600 or establish the communication in the reverse manner using the mechanism shown in FIG. 17, junction B, first and then junction A. For this description, it will be assumed that the operator without cables establishes a communication with the office 1600 using the mechanism of junction A and therefore will first actuate key 1812 which establishes an obvious circuit for operation of relay 1803 from earth through the key contact.



   Operation of relay 1803 leads to the earth of key 1812, by winding relay 1715 to the battery, actuating the latter relay. The earth associated with contacts 5 and 6 of relay 1715 extends over conductors 1744 and 1745, the filaments of lamps 1813 and 1815, to the battery, lighting these two la-.lues - Relay 1803 extends the earth, by the intermediary of its contact 1, of the contact 7 of the relay 1800, and of the filament of the lamp 1814, to the battery, lighting the latter lamp.

   The operation of relay 1715 connects the earth, through dE, its contact 3, of contact 5 of relay 1700, to the socket conductor of the switches
A bar;.; crossed, This relay also connects the windings
 EMI160.1
 relay 1-75 <µ, '3F r intermediate (The contact sound - and of the winding of relay 1:' 1 ::::, 1. the battery for subsequent signaling service. Relay 1506 is actuated. by a circuit including the
 EMI160.2
 resistance li # 1.3, 1 '# .nroullr;

  ie.nt of relay 1806, contact 3 of relay 1803, continuity contact 2

  <Desc / Clms Page number 161>

 relay 1806 and earth. Relay 1800 in operation establishes a blocking circuit to earth applied to its contact 2. Operation of relay 1806 establishes a circuit through its contact 1 for relays 1800 and 1801 and operation of relay 1801 establishes an obvious circuit. for relay 1802. The operation of relays 1800, 1801 and 1802 connects junction A by a channel in the operator position without cords which now operates.



  The position circuit ground is connected by designer 1735 to actuate relays 1700 and 1708.



   The cordless special operator now takes the form previously filled out for this call and operates her keys to set the recorders of the recorder-sender 1832 to position. The impulses coming from the keypad of the special operator without cables are not sent over the conductors of the junction to adjust the recorder-sender registers as described for the call order table but are included. seen by the keys of the position, directly in the recorder-sender. The code for a junction to office'1600 is recorded as is the number of the operator in office 1600 who initiated the call.

   The record of the callsign is transferred to marker 1607 which chooses an outgoing junction 1601 in the manner previously described and operates the crossbar switches 1602, 1603, 1604 and 1605 to connect the outgoing junction 1601 to junction A, Fig. . 17. A four-wire telephone circuit is included in the position circuit and is connected to conductors 1738, 1739, 1740 and 1741 to speak to this operator of office 1600. This telephone circuit can be connected to conductors 1746, 1747 , 1748 and 1749 for listening surveillance. At this moment the special operator without cords advises the operator of the interurban office 1600 that she is preparing - to establish the communication.

  <Desc / Clms Page number 162>

 telephone as requested.

   The recorder-sender 1832 and marker 1607 and relays 1700 and 1708 are released. If the junction 1601 chosen by the marker is a long junction to a remote office, the feeder relay actuated in marker 1607 provides an indication to the operator position with no leads activating a relay in that position which associates ground. to the conductor 1737 going through contact 5 of relay 1708 and the winding of relay 1714 to the battery, actuating relay 1714. This last relay is blocked by its contact 1 to the earth applied to contact 3 of relay 1715. As will be shown below, a signal is transmitted from this relay to indicate that a long junction has been connected to junction A, Fig. 17.



   Key 1842 can now be actuated to associate the junction B mechanism with the mechanism of the cordless position. Channel B, Fig. 18, is the same as channel A. The operation of the key 1842 establishes a circuit for a relay, -the same as the relay 1803- which functions to establish a circuit for the relay 1765. This last relay establishes circuits for the lamps. Des 1833 and 1835 and the relay such as 1803 establishes a circuit for the lamp 1834. The circuit for the relay 1807 is established as follows. battery, resistor 1811, winding of relay 1807, contact 3 of relay similar to 1803, contact 2 of relay 1807 and earth applied to contact 2 of relay 1806.

   The operation of relay 1807 connects earth to a conductor to actuate two relays such as relays 1800 and 1801 and a circuit is then established for a relay such as relay 1802. Earth is connected to relays 1750 and 1758 on the relay. ¯ conductor 1775 of a nosition circuit to activate the last two relays. The enrollment of relay 1762 is connected by the intermediary of contact 3 of relay 1765 winding it.

  <Desc / Clms Page number 163>

 ment of the 1759 relay for subsequent sienalisation.



    The special uncalled position operator again uses position recorder-sender 1832 to store the code for trunk 1904 in order to establish communication with office 1905. This recorder-sender transfers register at marker 1906 and the marker chooses outgoing junction 1904 and operates the crossbar switches to connect that outgoing junction to junction B in FIG. 17.



   Assuming that the junction to the 1905 office is a long junction, the route relay operates a long junction relay in the marker to register this indication. At this point the indication is transferred from relay 1714, saying that the junction to office 1600 is also a long junction. -When two long junctions are used for a communication of this type? a voice amplifier repeater is needed for good transmission, The circuit indicating a long junction from relay 1714 includes ground, its contact 2, relay contact 2 of 1758, conductor 1779, coil of relay 1830 and the battery.

   This relay locks up and associates earth, through the recorder-sender, with the marker on a sensitive LIT 1831 conductor the same as the 3440 conductor shown in FIG.



    34 of the recorder-sender accompanying this memorandum. This indication plus the route relay indication that the junction to the 1905 office is a long junction causes the marker to react to introduce repeaters into the transmission circuit between the 1904 junction and the line to the 1905 remote office.

   After the 1830 relay has operated, the 1750 and 1758 relays are activated so that the marker and recorder-sender can transmit signals through the circuit from position to outgoing junction 1904 which is. chosen by the

  <Desc / Clms Page number 164>

 marker 1906. The signal to choose a repeater activates a relay on the outgoing junction 1904 and this relay causes the selection of the voice-loss repeater.

     The indication that junction 1904 is a long junction to a remote office is also transmitted by the marker to the position circuit which associates a ground to conductor 1777 to actuate relay 1754. Relay 1764 establishes a blocking circuit. for itself by its contact 1 and contact 5 of relay 1750, to the earth applied to contact 3 of relay 765. Remember that relay 1765 is also blocked to an earth applied to contact 2 of relay 1713.

   The link during this delayed call by the cordless special operator may only be a link on one trunk of a trunk group having 1504-like trunks. The cordless special operator can have any number of calls. On cards for junctions to office 1905 and therefore when the conversation has been completed on the junction between offices 1905 and 1600, this special operator without cords may wish to use the same outgoing junction connected to incoming junction B, Fig .

   7, for a further call in the manner described to establish such communications from the call order table. When there are no other calls waiting to office 1600 or to office 1905, the cordless special operator connects earth to conductor 1743 to actuate the 1713 cc relay which causes the loosening of the two junctions A and 13 of FIG. 17 and the track mechanism, Fig. 18.



    CLAIMS.

** ATTENTION ** end of DESC field can contain start of CLMS **.


    

Claims (1)

--------------- 1. Telephone system comprising an office, automatic switching, a set of several other offices, the automatic switching office having incoming junctions from other offices and outgoing junctions. <Desc / Clms Page number 165> aunts to the other offices in groups according to the code designations or callsigns of the other offices and devices, responding to code pulses on an incoming junction, coming from one of the offices, poer automatically directing the incoming junction to a junction free outgoing, of a group of junctions with the appropriate code, characterized in that it supports a switch panel that can be operated by hand, in the automatic switching office, devices for making the exiting junctions of a group unavailable or unfit 1; automatic selection by incoming trunks from other offices and to automatically direct an incoming trunk to the switchboard, in response to the unavailable trunk group code that was pulsed into the auto-switching office and devices in the automatic switch panel to direct the incoming junction to a free position of the unavailable group. 2. System according to claim 1, characterized in that it comprises a call waiting circuit and devices, responding to calls from certain other offices to the unavailable group of trunks, to automatically direct the calling trunk to the waiting circuit. 3. System according to claim 1, characterized in that it comprises devices in the switch panel for announcing the waiting time by establishing the telephone call on a trunk of the unavailable group and for later establishing a communication with the telephone. calling party and with the called party when a free trunk of the unavailable group can be obtained. 4. System according to one or the other of the preceding claims, characterized in that it comprises a signaling circuit in the switch board, which can be re- <Desc / Clms Page number 166> linked to any group of outgoing junctions to flash one of the signals in a set of signals to indicate that there are free junctions in the group thus linked. 5. System according to either of the preceding claims, characterized in that it comprises special junctions associated with the switch board, an incoming junction to be directed to the switch board being connected by a junction chosen from among the special junctions, switchboard devices for directing an incoming junction to a free junction of the unavailable group including devices for connecting the chosen special junction to another of the special junctions and for transmitting the code pulses of the unavailable group to the other junction special. 6. System according to either one of claims 1 to 4, characterized in that it comprises special junctions associated with the switch board, an incoming junction to be directed to the switch board being connected by one of the special junctions. , switchboard devices for directing an incoming junction to a free junction of the unavailable group comprising devices in the switchboard for connecting the chosen special junction to another special junction and for transmitting the call code pulses. an unavailable group, to direct the incoming junction through the special junctions, to a free junction in the unavailable group, called first by pulses on the incoming junction. 7. System according to either of the preceding claims, characterized in that the devices responding to code pulses applied to an incoming junction to direct the incoming junction to an outgoing junction <Desc / Clms Page number 167> comprising feeder relays for each group of outgoing junctions, actuated in response to code pulses, test devices, devices responding to the operation of a feeder relay to link the junctions of a group corresponding to the code passes by pulses, to test devices for the selection and activation of a free trunk of the group, and to devices responding to the selection of the outgoing trunk - to connect it to the calling incoming trunk. 8. System according to claim 7, characterized in that it comprises devices responding to the impulses arriving on a calling incoming junction, representing the indicative of a group of unavailable junctions, to prevent the linking of the junctions of the. group to test devices and to activate a special feeder relay to link the junctions of a special group to its test devices for the purpose of selecting a special free junction to the switchboard, 'and devices in the switchboard for connecting the junctions of the unavailable group to the test devices of the unavailable group for the selection of a free outgoing junction. 9. System according to claim 1, characterized in that it comprises automatic switching interurban offices having short and long incoming junctions coming from the other offices, overloaded groups of outgoing junctions being made unsuitable for an automatic link. - that at long and short incoming junctions in response arriving indicative / through incoming junctions, a waiting utterance circuit, special junctions, devices to automatically divert short incoming junctions to the holding utterance circuit in response to the code passed by pulses of an unavailable group, to receive a statement of the waiting time for establishing a long distance call with the junctions of the <Desc / Clms Page number 168> group unavailable, devices for automatically diverting incoming junctions .., long on a free junction among the special junctions in response to the code goes by pulse, from an unavailable group, and devices for connecting the special junction thus connected to a free junction of the unavailable group. 10. System according to claim 7, characterized in that it comprises a second test device and devices for connecting the junctions of the unavailable group to the second test device in order to choose a free junction among the. junctions unavailable and to connect it to the incoming junction that calls, through the special junction. 11. System according to either of claims 1, 2, 3 or 4, characterized in that the automatic switching office has incoming four-wire junctions from the other offices and outgoing four-wire junctions in groups. according to the codes of the other offices, the said manually operable switchboard comprising special four-wire junction circuits having two transmission paths terminating in jacks of the switchboard, the position circuits of the switchboard having cords with plugs with several contacts for connecting special four-wire junctions to the two transmission paths, an incoming junction being directed to one of the special junctions in response to the code of the unavailable group of junctions which was passed by impulse in the switching office automatic, and devices for answering the incoming call by inserting a plug into a jack of the special junction, communication with a free junction of the unavailable group being established by inserting the other plug of the cord circuit from the position into a other special junction and starting the pulses <Desc / Clms Page number 169> of the code of the unavailable trunk group. 12. System according to claim 1, characterized in that it comprises overflow junctions specific to each group of outgoing junctions, devices for automatically directing an incoming junction yes calls on a junction, overflow. full when all the junctions of a group are occupied, a waiting denunciation circuit ending in the switchboard a device for connecting the overflow junction, specific to an overloaded group of junction occupied, to said circuit waiting utterance, the group's junctions being made unavailable for incoming junctions calling, the calling incoming junctions being automatically directed by the overflow junction on the waiting utterance circuit to inform the calling operator of the importance of waiting for the establishment of communications to the outgoing junctions of the unavailable group, the management devices of the switchboard causing the selection of a free outgoing trunk from the unavailable group of trunks in order to establish deferred telephone communications. 13. System according to claim 1, characterized in that it comprises special junctions ending in jacks and signaling devices in the switchboard, a circuit .2. cord and a telephone circuit in the switch board to answer a call by inserting a plug of the cord circuit into the jack of the associated special junction, a pulse circuit in the switch board, a free outgoing junction in the unavailable group being chosen by inserting the other plug of the cord circuit in the jack of another of the special junctions and by transmitting impulses on the conductors of this last special junction to adjust the recorders a recorder-sender according to the code of the unavailable group of trunks and <Desc / Clms Page number 170> a device responding to the selection of the free outgoing junction to connect it, by means of the two special junctions and the bead circuit, to the calling position. 14. System according to either of claims 1, 2 and 3, characterized in that it comprises, at the automatic switching office, incoming four-wire junctions in two transmission paths connected to the lines coming from. of the other offices and outgoing four-wire junctions in two transmission paths connected to the lines going to the other offices in groups established according to the code designation or call sign of the other offices, on the switchboard a position circuit in each position, a recorder-sender to recorderq, a double circuit of four-wire junctions connected to the position circuits with a switch connected to each end and a device in the switchboard for setting the recorders of the recorder-sender to connect the outgoing four-wire junctions to each end of the double junction circuit in order to establish a telephone communication between two of the other offices using the two transmission paths of the four-wire junction circuits.