BE383096A - - Google Patents

Description

       

   <Desc / Clms Page number 1>
 



  Telephone system.,
The present invention relates to telephone systems and more especially to arrangements by which automatic switches can be controlled by equipment provided in common for a telephone group.

 <Desc / Clms Page number 2>

 mutators.



   According to the invention, in a group of automatic switches associated with common control devices, the extension of the conversation circuit to one of these switches produces the operation of two relays in series passing through the circuit, one of these relays being placed in the common control unit while the other is specific to the switch.



   According to another feature of the invention, a telephone system comprises a certain number of groups of lines, each group being served by regular and additional searchers or intervening in the event of an excess in which the regular searchers and in Excess cases are put into use by passing different brushes to another switch.



   According to another characteristic of the invention, a pulse repeater is associated with the common control apparatus which in turn can be associated with a repeater by the operation of a separate relay specific to the repeater.



   Finally, also according to the invention, a group of final selector switches can cooperate with digital input switches associated with control devices common to a remote office by passing through a two-wire junction and are provided with means for placing a busy state on the junctions associated with digital switches when the common apparatus associated with these switches is taken in service,
The accompanying drawings are intended to explain how the invention can be practically carried out.

 <Desc / Clms Page number 3>

 



   Figures 1, 2, 3 and 4 show the arrangement of the seeker switches.



   Figure 5 shows a first group selector with two sets of brushes.



   Figure 6 shows a second rump selector with a set of brushes.



   Figure 7 shows a second, group selector with two sets of brushes.



   Figure 8 shows a final selector with two sets of brushes,
Figures 9 and 10 show a P. B.X.



   Figure 11 shows a pulse repeater and Figure 12 shows a layout diagram while Figures 13 and 14 show a discrimination selector repeater for use with digital input selectors associated with common control devices.



   The common equipment is preferably associated with a vertical group of switches, one of which controls the first selector on each of for example 1- ten shelves and the other of which controls the second selector on each of, for example, ten shelves, etc. ... This method has the advantage over the arrangement consisting in associating the equipment with a horizontal group of switches, that each tablet of ten selectors has access to ten different common control equipments and thus the possibility of a major disturbance caused by a simple fault is eliminated.



   The switches are of the two-way degree-by-degree type of well-known construction.

 <Desc / Clms Page number 4>

 Seeker switches and the first selector switches are joined together and the seeker switches are controlled by common equipment which is connected to the switch so as to be controlled by means of a distribution switch while the selector switches are controlled by a equipment that is common to all the switches in a group. The two groups of common equipment are interconnected by actuation of circuits extending from one to the other.



   The first selector switch includes other features such as arrangements for a double seeker movement with preferential switching to give an excess busy state from the common equipment and in the case of permanent circuits in order to trigger the common equipment and to connect a sound of number not obtainable from the selector.



   The final selector switch is also provided with two sets of brushes, but in this case the set of brushes taken in service depends on the path along which it is gripped. The ringing, counting and busy sounds are connected in the common equipment, The relays forming a bridge to provide conversation current to the calling and called subscribers are not connected, until the called subscriber answers , but they are connected by a relay located in the switch and this relay is maintained in operation under the control of the calling circuit.



   In the repeater, the bridge placed across the outgoing circuit, after a train of pulses is terminated, is placed in the common control equipment and can therefore have a low impedance thus avoiding the tendency to give an extraordinary pulse. at the relay

 <Desc / Clms Page number 5>

 line at the remote end of the line stub that existed in previous repeaters.



   In addition, the pulse repeater relay is placed in the common control equipment so that this relay can have a low impedance in order to respond exactly to pulses while the relay in the repeater to supply of the conversation current can have a high impedance so as to reduce the transmission loss.



   In addition, the common control equipment can be disconnected from the repeater, both when a called subscriber answers and when a called operator answers, different signals being received by the repeater in both cases.



    Figures 1, 2, 3 and 4; a known type line finder except that excess finders are attached and minor modifications have been made to allow operation with common group control selectors.
The subscriber lines are divided into groups of 200 and each group is provided with a number of individual seekers and when these are all busy excess switches are put into use. Sufficient individual finders are provided to cater for any traffic except the peak during which excess finders are put into use.



   Two, three, four or five excess seekers each from a group of 200 different lines are connected to a selector group and a number of similar combinations will constitute an excess group. . This excess group caters to peak traffic from a number of groups

 <Desc / Clms Page number 6>

 of 200 different subscriber lines. Traffic peaks of, for example, four groups of 200 lines will not coincide and this fact is taken advantage of to save a significant number of first selectors. The number of different line seekers connected to an excess or additional group selector is determined by the traffic. The schematic representation by sections shows in FIG. 12 this characteristic.



   In this figure ARD and AOD represent the two brushes of the distribution switch by which the regular seekers intervening in the event of excess are put into use. The ARD brush is connected to regular searchers such as 1 ARF and 2 ARF which in turn are directly connected to the first selectors of groups 1 AFGS and 2 AFGS associated respectively with common control devices 1 FGC and 2FGC. The AOD brush is connected to the finder in case of excess 1 OF which at the same time as researchers in case of excess 2 OF, 3 OF and 4 OF from other groups of lines is connected to the first group selector 3 AFGS .

   The remaining group selectors 3 BFGS 3CFGS and 3DFGS are similarly connected to excess seekers from other groups and are controlled by the common device 3 FGS.



   It will be seen that the savings in selectors obtained by adopting the principle of the group of researchers in the event of excess are completely independent of the common control system.



   The first group selector can be either of the 10/10 or 10/20 type. A permanent loopback state triggers the common equipment and the selector alone is maintained.

 <Desc / Clms Page number 7>

 



   What is proposed is to move the selector forward and search for free sound equipment with a number that cannot be obtained on stage 1.



  It is proposed to provide the first ten selectors with common equipment. The excess busy signal is given from the common control equipment as this condition could not affect more than one in five hundred calls with the average level of service.



   The second group selectors can be of the 10/10 or 10/20 type. The associated common equipment will not contain relays to trigger the PGs but surplus occupancy signals will be given by them. It is proposed to provide common equipment for 20 selectors.



  In addition, similar type selectors of any rank are interchangeable.



   Regular end selectors are of the 200 line type and provide battery power for both callers and called parties.



   Bell, counting and busy sound are controlled by the common equipment. Since the common equipment is maintained until the called party answers, it is proposed to provide a common group for six final selectors.



   The P.B.X. can have from two to ten lines in groups and use a common control equipment from which are given movement facilities P.B.X., la. ringing the counting and the occupancy probe. As the common equipment is maintained until the called party answers, it is proposed to provide six selectors with common equipment.

 <Desc / Clms Page number 8>

 



   Repeaters for use between two automatic desks with a common control simplify the following problems that exist in the current model of repeaters: a) the introduction of a high impedance bridge across the circuit outgoing after a pulse train has ended has a tendency to give an extraordinary impulse to remote relay A. b) local relay A should have a low impedance for number disk operation and a high impedance for powering the talk battery. c) the difficulty of giving supervision when the call extends to a hand panel, given that a reversing battery sets counting states in position.



   The proposed circuit shows how these problems are solved in a simple way. At the same time, wider operating limits than currently possible are foreseen. Since the common equipment is maintained until the called party answers, it is proposed to provide a common equipment, four repeaters.



   With particular reference to figures 1, 2, 3 and 4, of which figures 2 and 4 represent a subscriber line circuit, a line finder and a distributor associated with the group designated by A and figures 1 and 3 show similar circuits connected to a group B.



   When a group A subscriber initiates a call, the LR relay will operate from the battery through a lower winding of the LR relay, the CO2 armature, conductor 10, the circuit containing the line of the calling subscriber. lant and the device, the conductor 11, the armature co3 and the earth, and to the armature lr3 apply the earth to the conductor

 <Desc / Clms Page number 9>

 combined start-up and floor marking on the rows of vertical fixed contacts of the finder, at the armature lr 1, the earth is also applied to the normal private conductor 42 to protect the line against incoming calls.

   Distributor relay A is therefore energized, the circuit being, the battery, the winding of relaio A, the armatures krl, za5, ya2 the non-inductive resistance the armatures col and lr3 and the earth,
The rotary line distribution switch pre-selects and operates as follows:
If a contact of the regular protection board, that is to say the board with which the brush 7a is in contact is earthed, the relay S of the distributor operates in series with the relay H but without activating the latter, and to the armature if it completes a circuit for the distribution motor magnet DDM which, by acting at the location of the interrupting springs ddm, closes the circuit of relay S.

   This interaction between the S relay and the motor magnet continues until a free contact of the regular protection board is reached. It must be mentioned here that the relays YA and ZA of the group A distributor circuit (figures 2 and 4) and the relays lyA and IZA of the group B distributor circuit (figures 1 and 3) are operated normally, and for for this reason their armatures are shown in the drawings in an operating position.

   It will be seen that the YA relay will only stay on, as long as there is a triggered seeker in group A so that if all seekers are busy, the YA relay will trigger.

 <Desc / Clms Page number 10>

 since the earth will be removed from all conductors, such as conductor 16 and to the armature ya2 will transfer common actuation to relay lA of group B of searchers. If all group B seekers are busy, the common actuation is returned to group A relay A by tripping relay 1 yA of distributor group B circuit and the additional seekers are put into use.



   If it is assumed that a triggered searcher is found in group A, the brush 7a will no longer be earthed on the fixed contact, but will be connected to the battery by the YC resistor located in the first selector. group (Figure 5). In this way the relay H will work by the circuit: battery, resistance YC (figure 5) armatures 2hbl, 2ha2, private conductor 15, occupancy jack T 1 of the finder switch, N3 contacts, fixed contacts and bali 7a of the distribution switch ADS, armatures ya3 and kl, the two windings of relay H in series, the armatures k4 et al and earth.

   Current will also flow from the battery, the coil of the relay S, the ddm switch springs, the armature hl, the lower coil of the relay H, the armatures k4 et al and the earth, but the resistance of the lower winding of relay H is such as to prevent the operation of relay S in this circuit. Relay H operates and closes on its upper winding with low resistance passing through the h2 and hl armatures, in series with the YC resistance of the first selector group and at the h3 armature energizes the K relay which operates and closes through the reinforcements k4 et al.

   At armature k6 a circuit is completed for relay 2A of the first team-

 <Desc / Clms Page number 11>

 common group selector switch, (figure 5), equipment which operates thus starting from the sound battery of the numbered disc, the armature bb2 the winding of the relay 2A, the seal X, the armatures 2hb4 and 2ha5 of the first group selector, the negative conversation conductor 13, the armatures ha5 and hb5 of the finder switch, the contact and brush 6a of the distributor switch, the armatures fr 2, c 1, g 1, and k 6 and the earth. At armature 2al, relay 2B is energized and during operation earths, passing through armatures 2b2 2hb1 and 2ha2, the private conductor 15 by short-circuiting relay H of the distributor which is triggered.

   The same earth is then used to operate a slow-acting relay C from the distributor passing through the armatures h2, k7, kr2, frl, the coil of the relay C and the armature. At armature cl, the short circuit is removed from the distributor relay FR winding and furthermore the circuit for the vertical finder magnet VM is also completed starting from the battery, by the coil winding. the vertical magnet VM, the fixed contact and the brush 3a of the ADS distributor, the low resistance winding of the relay C the armatures cl, gl and k6 and the earth. It should be noted that the first selector shown in FIG. 5 can be used, either associated with a finder switch as described or as an input selector.

   When used in the first case the Y-capacity seal is removed and the X-seal is added, while in the second, the X-capacity seal is removed and the Y-seal is added. The FR relay also works in series with the 2A relay of the first equipment as a selector group and at the frl armature cuts the circuit of the coil of relay C. When the vertical magnet: operates, its

 <Desc / Clms Page number 12>

 v contacts / will activate relay G of the distributor starting from the battery, the winding of relay G, the armature fr3, the winding 2a and the fixed contact of the ADS switch, the springs forming the switches of the vertical magnet, contacts V and earth, and to armature gl will close the circuit of the vertical magnet and relay C.

   This type of interaction between the relay and the magnet is well known and will continue until the researcher has raised his brushes to the marked level, after which the earth which has been applied to the wire marking the level at the armature lr3 of the subscriber's line circuit will then be transmitted by the vertical switch VW, the normal rotary springs WR1 the fixed contact and the brush Ia of the ADS switch, the armatures c2 and g2, the winding of relay G, resistor YA and the battery, thus keeping relay G in operation.

   Relay C which has been kept in operation until now through its low resistance winding in series with the vertical magnet, will then trip, as its circuit is cut to the armature gl so that the Relay G will also trip when its circuit is cut at armature c2.



   The line finder RM rotary magnet is then actuated starting from the battery, the rotary magnet winding, the fixed contact and the brush 4a of the ADS switch the low resistance winding of the KR relay , the armatures fr2, cl, gl, and k6 earth and will put the searcher switch brushes in contact with the first set of fixed contacts on the special stage, at the same time connecting the relay G through the springs R from the rotating magnet R and the armature ha2 to the seeker switch 3c. The KR relay will then operate by passing through this circuit and

 <Desc / Clms Page number 13>

 , will earth through the kr 2 armature at the location of the normally open spring contacts N 3.



   If it is assumed that the line circuit associated with the first set of contacts is not that of the calling subscriber, the contact on which the brush 3o rests will be earthed, either by the armature lr2 of the line circuit if the special line is not occupied or if the is occupied by the private broom of the line finder which is being used at. this call, In each case, this earth will be used to activate the relay G which at the armature gl will cut the circuit of the rotating magnet. This interaction between relay G and the rotating magnet will continue until the contacts associated with the calling line are reached.



   If we now suppose that these contacts touch the brushes le, 2c or 3c the HA relays will then perform a commutation during the time that the remainders R of the rotating magnet are closed, the circuit being the earth, the armature kr3 , the brush 1a and the fixed contact of the fixed switch, ADS the lower winding of the HA relay, the rotating magnet springs R, the fixed contact and the brush 2a of the ADS switch, the armature fr3, the winding of relay G, the battery, but the resistance of this winding of HA is such as to prevent the operation of relay G in this circuit.

   At the armature ha2, the earth located on the private conductor 15 is then extended by the brush 3c and the fixed contact of the searcher switch and the armature lr2 of the calling subscriber line circuit to make the CO relay act on its winding interior and also to maintain the LR relay on its upper winding.

   The CO relay at the neck armature disconnects the earth from the common starting wire which triggers the distributor's relay A by starting

 <Desc / Clms Page number 14>

 thus the triggering of all the distributor relays, but, the first group selector associated with the seeker switch will then be maintained under the control of the calling subscriber, given that the circuit for relay 2a in the first common equipment of group selector will be the sound battery of the numbered disk, armature bb2, coil of relay 2A, joint X, armatures 2hb4 and 2ha5, negative conductor 13, armature ha5, brush 20 and contact fixed of the seeker switch, the conductor 10, the circuit containing the line of the calling subscriber and the apparatus, the conductor II, the fixed contact, and the brush Ic of the searcher switch,

   armature ha4 the positive conversation conductor 14, armatures 2ha4 and 2hb3, the left winding of relay 2K and earth. Relay K then operates and will close on its right winding passing through its first armature kl to earth at armature 2b2.



   It will be seen that when the relay HA of the finder switch is actuated, the corresponding winding of the relay HB will be short-circuited on one side by the earth, passing through the armature kr3 and the brush 1a and the fixed contact of the ADS switch and on the other side by the earth which will be connected to the contact on which the brush 6c is currently based, given that the line associated with this contact is not the calling line.



   If, however, the calling line is associated with the level with which the brushes 4c, 5c and 6c are in contact, then the relay H B will perform a commutation and the relay H A remains short-circuited. Relay H B in the switching performs exactly the same function as relay H A except that the other set of row switches extend to the first selector group.

 <Desc / Clms Page number 15>

 



   When the conversation is finished, the switching relay HA or HB, as the case may be, can be tripped and a circuit is completed for the searcher switch tripping magnet from the battery which may be earthed through the well-known alarm tripping relay, the winding of the ZM tripping magnet, the armatures hb3 and ha3 the normally open contacts N1, the armature k6 of the distribution switch, in order to reset the switch seeker to normal.



   If, an error forces the start relay A of the distribution switch to remain in operation for a period longer than a fixed period (usually three seconds) the time pulse which acts in conjunction with the relays TA and TB in a well-known way will transfer the joint operation, to the other group of researchers.



   It should be mentioned that group A of researchers serves one hundred subscribers forming group A on the five lower levels and the one hundred subscribers forming group B on the five upper levels. Group B of researchers serves the hundred subscribers forming group B on the lower five floors and the hundred subscribers forming group A on the upper five floors.



   As indicated previously, when all researchers in group A are busy, relay YA of the distributor circuit of group A will trip and on armature ya2 will transfer the common start wire to relay 1A in the circuit. group B distributor. Relay lA will therefore be activated during subsequent calls originating from group A and the searcher of group B will therefore carry out all the traffic while the regular searchers A

 <Desc / Clms Page number 16>

 remain busy, but if all searchers B also become busy, the relay IYA will return the activation of group A in common to its own distributor. In addition, calls coming from group A will then be handled by group A. excess or additional researchers, but if these are also busy,

   the ZA relay will be triggered so that if other calls originate during this period, the LC relay will be energized to activate the lost call counter (not shown). The sequence of operations is identical for calls coming from group B except that the procedure is reversed.



   Referring to the subscriber line circuit (Figure 2), when the subscriber makes a call, his counter will be. shorted to earth on the private conductor, passing through the armature co4 and the upper coil of the CO relay, but when the call is finished a local circuit can be traced in the following way -after: earth, subscriber meter armature, co4 armature, upper coil of CO relay, lr2 armature, upper coil of LR relay, lower coil of CO relay and battery. This circuit has a high resistance and therefore the counter does not work. Also in this state, the coils of the CO relay will act in opposition so that it is quickly triggered, thus cutting the circuit already mentioned.

   When an auxiliary battery is applied to the private conductor for measuring purposes, the short circuit on the meter will be replaced by a full auxiliary battery (which, as is well known, is usually a battery. at 50 volts with its negative pole grounded) and the meter will then operate.

 <Desc / Clms Page number 17>

 



  When the auxiliary battery is replaced by a protective earth, the counter will again trip and for this reason it will be seen that several applications of auxiliary battery to the private driver which can take place, as it is conceived, in metering ranges. of zone, will give a corresponding number of records on the subscriber's counter. While an auxiliary battery is connected to the private driver, the two coils of the CO relay will help each other; they are opposed only during the triggering of the connection. If counting per zone is not necessary, the indicated line circuit can obviously be simplified considerably.



   Referring now to the first group selector shown in figure 5, when the subscriber circuit extends from the seeker switch, relay 2K will operate in the previously designated circuit and close to earth. by its right winding, starting from the battery, the right winding of relay 2K, the first armature 2kl, armature 2b2. It will be remembered that the relay 2A and consequently the relay 2B are already activated by the. earth sent from the researcher distributor.



  Relay 2B by earthing the private commua driver to armature 2b3, sets all the first selectors of the group to occupation.



   The first pulse from the number disc triggers relay 2A which will move the vertical magnet 2VM from the first group selector through the circuit, the battery, the coil of the 2VM magnet, the normal rotary springs. 2 NR 1, 'the 2k5 and 2gl armatures, the right low resistance winding of relay 2C, the armatures

 <Desc / Clms Page number 18>

 tures b, b3, 2b6 and 2al and the earth. Relay 2C also operates through this circuit and remains in operation in a well known manner during the pulse train.



  It should be noted that only the vertical magnet of the group selector used is put into operation since in all the associated selectors the 2K relay. is not excited.



   When the vertical pulses are completed, relay 20 will trip and complete a circuit for the 2 RM rotary magnet of the first group selector starting from the battery, the winding of the 2 RM rotary magnet contacts normally. open 2N3, the fittings 2k4, 2g4, bbl and 2cl and the earth which will thus move the brushes of the group selector so as to put them in contact with the board. If two of the private contacts with which the 3rd and 6th brushes are in contact are grounded, the 2G relay will operate, when the 2R springs of the rotary magnet are operating towards the end of the rotational movement, the circuit being, the battery the right winding of relay 2G, the springs 2R of the rotating magnet, the armature 2ha3 the brush 3rd and the private contact put to. Earth.

   On the other hand, the other winding of relay 2G will be short-circuited, on the one hand, by the other earthed contact passing through brush 6e, armature 2hb2, rotating springs nor- ills 2N Rl, the 2k5 and 2gl reinforcements and on the other hand by the earth through the 2c1, bbl and 2g2 reinforcements, so that although the 2G relay will work. in order to cut the rotating magnet circuit at armature 2g4, its left holding winding will be inactive. This interaction between relay G and the rotating magnet will continue until a

 <Desc / Clms Page number 19>

 free section for the next row of switches characterized by a private ungrounded contact is found.



   If brushes 3rd and 6th meet triggered contacts, simultaneously while the rotating magnet is energized and the rotating magnet springs are closed, there will be a completed circuit for the 2HA switching relay, starting earth, the lower winding of relay 2HA, armature 2k6, springs 2R of the rotating magnet, the right winding of relay 2G and the battery. The HA relay will continue to operate on its upper winding to the private grounded conductor passing through the 2ha2 armature, but the 2G relay will not be able to operate due to the relatively high resistance of the lower winding of relay 2HA.

   The positive and negative conversation conductors and the private conductor are switched to the next higher selector and the common equipment of the first group selector will be triggered as the circuit for relay 2A is then cut at armature 2ha5.



   If the private contacts associated with 3rd broom were occupied and contacts associated with 6th broom were free, then relay 2G could operate and close on its left winding, after which relay 2HB could operate depending on the circuit. According to earth, right-hand winding of relay 2HB armature 2k7, normal rotary springs 2NR1, armatures 2k5 and 2gl the resistance YD and the battery.

   The 2HB relay will close on its left winding towards the private conductor, passing through the 2hbl and 2ha2 armatures in order to switch the appropriate conversation conductors and the private conductor to the next selector row

 <Desc / Clms Page number 20>

 
If all the sections located on the special stage subjected to the action of the number disc are occupied, the switching brushes will be turned to. eleventh position of rotation, after which the CS cam springs will be actuated.



   The 2G relay will operate via CSI cam springs, and the 2R rotary magnet springs and the BB relay will then operate via the CS2 cam springs and the 2g3 armature, then closing independently. the 2g3 reinforcement through the bb4 reinforcement. The ground through the springs CS1 will also extend to the eleventh private contact to which the surplus meter is connected for that special selector level so that this counter will be actuated to register the surplus state.

   At armature bb2 a busy light is connected to the inrush conductors passing through the coil of relay 2A and a circuit is completed to connect the maintenance battery from the busy state to the 'winding of relay 2B passing through the armatures bb3 2b6 2al, which will keep relay B in operation whenever the circuit of its left winding is cut due to the intermittent tripping of relay 2A below the occupation glow action.



   If a subscriber does not operate the number disk within a predetermined period of time, the time pulse will be provided by the pulse cam "S" will actuate the TP relay on its right winding by passing. by armature 2b4 and cxl so that this relay will operate and close on its left winding starting from the battery, the left winding of the TP relay on the armatures tpl, cx2, 2b3 and earth.

   In armature tp2 the TZ relay is connected to the Z pulse cam, so that the next time this switch is activated.

 <Desc / Clms Page number 21>

 came it will earth in order to actuate the TZ relay which at the tz2 armature will complete the vertical magnet circuit starting from the earth the tz2 bb3 armatures, the right winding of relay 2C the 2gl and 2k5 armatures, the normal rotary springs 2NR1 the winding of the vertical magnet 2VM and the battery in order to move the brushes one degree vertical. Upon termination of the "Z" pulse the vertical magnet and relay 20 will trip and the rotary breakage of the brushes on the board will occur, the switch exerting a seeker motion for sound equipment for a number not obtainable, linked to first level contacts.



   Referring now to Figure 6, this shows a second group selector of the ten-level, ten-section type and it is assumed that the call extends from the first selector to a group selector. of that type.



   When the subscriber circuit extends from the first selector, the 3K and 3A relays will work in series passing through the circuit, earth, the left winding of the 3K relay, the armature 2hl, the conductor 46, the circuit including the. subscriber line and the device, laying through the first group selector, the line finder switch and the line circuit, the conductor 45, the armature 2h2 the joint 1X, the coil of the relay 3A, the lbbl armature, the battery, the 3K relay, thus closing to the earth which is sent to the private conductor 47 passing through the first 3kl armature.

   Relay 3A completes a circuit for relay 3B passing through armature 3al which operates and armature 3bl sets all associated selectors to occupation and armature 3b2 maintains relay K. The train d The pulses constituting the next digit formed by the number disk will move the switching brushes.

 <Desc / Clms Page number 22>

 tion to the desired level, after which the 3C relay will trip and allow the 3RM rotating magnet to bring the brushes into contact with the board.

   If the first section is occupied, the 3G relay will operate and cut off the rotary magnet circuit and this interaction will continue until a free section is found, after which the characteristic absence of earth. the contact on which the brush 3f will then rest will allow the 2H relay to perform a switchover in series with the 3G relay, the circuit being: the battery, the winding of the 3G relay, the 3R magnet springs rotary, armature 3k6, lower winding of relay 2H and earth. When the 2H relay operates, it switches to a final selector such as the one shown in figure 8 and triggers the common equipment.



   If all the sections of the level subjected to the action of the number disc are occupied the brushes will be turned to the eleventh rotational position at this level and the cam springs will be actuated in order to effect a recording on the surplus counter at the location of the cam springs 1 CS1 and activate relay 1BB at the location of the springs 1 CS2. Relay 1 BB when operating at armature 1 bbl will connect the busy light to the calling line passing through the coil of relay 3A and armature lbb4 will apply the keep busy state to the right winding of the SB relay. It should also be noted that in this circuit the switching magnets are all associated with the common control device via normally open contacts.



   Figure 7 shows a first group selector of the ten-level, twenty-section type whose circuit functions are similar to those of the first selector.

 <Desc / Clms Page number 23>

 group dialer shown in Figure 5 except that there is no numbered disc sound equipment or facility for the transmission of numbered sound that cannot be obtained if the subscriber is late in operating the system. disc with numbers.



  A detailed description of this circuit will therefore not be given.



   If we now refer to the final selector shown in figure 8, we will see that either the WS and 4A relays or the K and 4 A relays will operate in series through the subscriber's calling circuit depending on the level. of the selector from which the connection extends, this final selector being of the type which is commonly referred to as a final selector with two hundred lines. If the WS relay is functioning, the switch will operate through one group of one hundred lines, while if the WS relay does not operate, the switch will operate through the other group of one hundred lines.



   If it is assumed that the connection extends so as to operate the WS and 4A relays in series, the WS relay will close on its right winding passing through its first armature wsl and will trigger the springs d. magnet 4zl and 4z2 towards the earth sent to the private conductor 51. This earth is replaced when the relay 4B of the common equipment is activated by the earth coming from the armature dl passing through the armature 4b5. The WS relay also completes a circuit for the 4K relay, passing through the circuit battery, the right winding of the 4K relay the ws5 armature, the normally closed contacts 4N2 the 4k2 and 5b4 armatures and earth. The 4K relay then operates and closes on its right winding passing through its first 4kl armature, the earth, 4b5 and dl armatures.

   Relay 4A produces on contact 4al the func-

 <Desc / Clms Page number 24>

 operation of relay 4B which closes on contact 4bl a circuit for relay 4C starting from the battery, the right-hand winding of relay 40, armatures 4b2, rn2, 3h3,4k5, contacts 4NE and 4NR2 and the earth in sight to prepare the vertical magnet circuit for the armature 4c3. Vertical pulses will move the switch to the desired level and keep relay 4C operating. The AC relay will trip on the completion of the vertical pulse train to complete a circuit for the relay E starting from the battery and passing through the armature of the relay E the armatures 4c2, rn3, 3h3, 4k6, normally open contacts 4N3, normal rotary contacts 4NR2 and earth.

   Relay E when operating in frame e4 will allow relay 4C to operate again, after which relay E will stay earthed through the battery, the coil of relay E armatures 4c2 e2 4b3 l 'inertia on relay E keeping it in operation while armature 4c2 is being switched The next pulse train constituting the final digit of the desired number will move the rotating magnet to the desired line, e keeping relay 40 energized, passing through the circuit battery, the winding of the 4WD rotating magnet, the armatures 4k4, e3, 4c3, 4bl, the low resistance left winding of the relay 4C, the armature 4al and earth, the first pulse also operating the RN relay from the battery, the right winding of the RN relay,

   the rn7 armature in parallel with the 4WD rotating magnet and the 4k4 armature. The RN relay will close immediately to earth from the battery, the right winding of the 4RN relay, the armature rn7 the left winding of the RN relay, the armatures f3 and 4b4. When the rotational pulses are terminated, relay 4C trips.

 <Desc / Clms Page number 25>

 ra and will start to trigger ....- relay E, but assuming that the called party is unoccupied while this last relay is triggered, a circuit will be formed for relay H starting from the earth, passing through the 4b3 and e2 armatures, the lower winding of the 3H relay, the 4cl, 4k7 and ws2 armatures, the private broom and the fixed contact up to the battery via the breaking relay of the subscriber.

   Relay H will operate its first 3h1 armature via this circuit and will close immediately, to earth via this armature to the 4b3 armature. In addition, the called subscriber's line circuit breaker relay will operate to clear the line of tie points before the bell is connected when relay E has tripped.

   The circuit for the application of ringing current will be: the ring generator RG earthed, the right winding of relay F, the armatures el, f4, 3h3, 4k6, ws4, the brush and the fixed contact and the circuit comprising the subscriber's ringtone and the capacitor, the fixed contact and the brush, the ws3 4k5, 3h2, f5 armatures YE resistor and the battery o In addition, at the 3h4 armature a ringing sound is transmitted to the calling party by the winding of the relay 4A in order to inform him that the ringing of the called subscriber is operating.



  After relay E has tripped, relay J will operate starting from the battery, passing through the winding of relay J, armatures f2, rn4, e2 and 4b3 and earth and when the called party answers relay F will operate its armature fl thus eliminating the short circuit starting from its left holding winding, after which the relay can operate completely, the circuit then being the battery, resistor YD, the winding of 'left of relay F, armatures 3h6, e2 4b3 and earth. To arma

 <Desc / Clms Page number 26>

 tures f4 and r5 relay D will be connected passing through the looped circuit of the called subscriber, while at armature f2 the circuit for relay J will be cut.

   We will see that at the same time, the relay RN depends on the armature j2 and like the re. layer D will operate immediately while relay J will trip slowly, an auxiliary battery will be applied to the private driver 51 passing through the fittings rn6, and dl for a period of time sufficient to operate the meter of the calling subscriber. With the RN relay tripped, relay 5B of the final selector will now operate from the battery through the winding of relay 5B, the normal rotary springs 4NR 1, the armatures 4k3, rnl, f3 and 4b4 and the Earth.

   The operation of relay 5B closes a circuit for the operation of relay 5A passing through the talk conductors and this relay supplies talk cost to the line and to the armature 5al closes a blocking circuit for the relay 5B La conversation can now take place between the subscribers * In addition, the operation of relay 5B produces the triggering of the common equipment and also of the 4K relay.



  At the end of the conversation, the final selector switch 4ZM tripping magnet operates as soon as armature 5b4 returns to normal since relay 5B is being tripped when its circuit is cut to the armature. 5al by triggering relay 5A.



   At the springs 4Z1 of the trip magnet, the holding circuit of the WS relay is cut off to allow this relay 4 to be brought back in place while at the springs 4Z2 of the trip magnet, the private driver 51 is put at earth in order to protect the final selector, during the tripping period.

 <Desc / Clms Page number 27>

 



   If the called party had been busy, the earth located on the private fixed contact would have prevented the 3H relay from operating and after the slow tripping period of the E relay, the J relay would have operated by passing through the circuit described previously in order to connect a busy light on the calling line passing through the fittings jl, 3h4 and the winding of the relay 4Ao i the calling party had indicated on the dial a number not obtained, the fixed contacts associated with it being connected to sound equipment of a number that cannot be obtained, then after relay 3H has switched the battery to the negative conversation conductor, relay F will operate in order to make the bell act, but will not activate relay D. Operation of relay F will trigger relay J which in turn triggers relay RN.

   Relay 5B of the final selector is therefore put into operation in order to trigger the common equipment and to connect the caller passing by a sound of number not obtainable, but since relay D does not work, the auxiliary battery is not connected to the trigger leg since it is not desired that a single such call can be counted.



   Figures 9 and 10 show a final conductor called P.B.X. which is arranged to serve separate lines passing through a set of brushes and groups of two to ten lines passing through other sets of brushes. Depending on the selector stage by which the final selector is entered, each of the relays 1WS and 6A or 5K and 6A will operate in series with the circuit of the calling subscriber. If it is assumed that the lWS and 6A relays are working, the lWS relay will block immediately by going through its lwsl armature

 <Desc / Clms Page number 28>

 the springs 5Z1 and 5Z2 of the tripping magnet, the springs of the occupancy finder jack 6Tl the private conductor 53 which at this moment is earthed by the previous selector.

   At the 1ws5 armature a circuit is completed for the 5K relay which operates through its right winding from the battery, the right winding of the 5K relay, the 1ws5 armature, the normally open springs 5N2, the 5k2 and 6bl armatures and the earth and it closes to the earth starting from the battery, by the right winding of the 5K relay the 5k1 armature, the 7b4 armature and the 2dl armature as relay 7B will operate at frame 6al after relay 6A has operated. This earth will also maintain the 1WS relay when the earth sent from the previous selector is removed from the private conductor 53.

   Relay 7B while operating at armature 7b5 is also used to operate relay 6C starting from the battery by the right winding of relay 6C, armatures 7b5, lrn2,4h2, 5k5, springs normally open 5N2 the normal 5NR2 rotary springs and earth. When the subscriber forms the final pulse train by the dial, the switching brushes move to the required stage, relays 6C and 7B remaining in operation and at the end of the pulse, relay 6C will be triggered, and will energize the lE relay passing through the circuit, the battery, the IE relay winding, the armatures 6c3, lrn3, 4h5, 5K6, the normally open springs 5N2, the normal rotary springs 5NR2 and the Earth.

   At armature le3 this earth will be linked to the winding of relay 6C, making this relay operate while relay lE is then maintained by passing through armatures 6c3, le4 and 7b2 and the earth. le2, the pulse current is transferred from the vertical magnet to the rotating magnet. so that the next train of pulses

 <Desc / Clms Page number 29>

 will operate the 5RM rotating magnet the circuit for each pulse being the battery, the 5WD rotating magnet winding, the 5k4 armatures, the2, hs2, the low resistance left coil of the 6c relay, the hs3 armatures , 6v4,
7bl, 6al and earth.

   If it is assumed that the 1WS relay is not activated and that one of the hundred regular subscribers is requested, the P.B.X. of the selector will not enter the subsequent operation which will be in substance the same as that explained previously in connection with the final regular selector shown in figure 8, but if the 2WS relay is actuated, then the P.B.X. switch will be put into action. In this case, it must be mentioned that all the lines of any group P.B.



  X. except the last row of the group will have their contacts in the shape of an arc P.B.X. connected to earth and further the arc-shaped brush P.B.X., lf is arranged so as to bring a contact space on the arc-shaped brush P.B.



    X., 2f.



   If we assume that the first row of a P.B.X. is subjected to the action of the dial, the broom lf vien-. d will rest on the P.BoXo contact associated with the first line of the group and the brush 2f on the P.B.X contact. a. associated with the last line of the previous group which, as indicated, will not be grounded.



   It will thus be seen that when the relay 60 trips at the end of the rotary movement, the relay HS will operate starting from the battery, the resistance YG, the armatures ljl, 4h4, 6c2, the left winding of the HS relay, the armature 5k9 and the brush lf, the arc-shaped contact PBX, the armatures lws5, 5kl, 7b4 and 2dl and the earth so that assuming the first line is occupied,

 <Desc / Clms Page number 30>

 when the lE relay returns to its place, a circuit will be completed for the rotating magnet, starting from the battery by the 5WD rotating magnet winding, the 5k4, hs2 armatures, the left winding low resistance of relay 60, 1 armature hs3, the right winding with low resistance of relay HS, armatures 4h7 le4,

     7b2 and the earth and switch brushes are turned - so as to make contact with the next row of the group.



   If, however, the first line of the group had been unoccupied, relay 4H would have effected a switchover before relay lE had tripped in a manner similar to that described in connection with the final regular selector shown in figure 8.



   When the rotating magnet worked, the circuit of lE relay will be completed again from the battery by winding lE relay, armature 603, springs 5R of rotating magnet, armatures 1ws5, 5kl, 7b4, 2dl and earth so that the lE relay operates and breaks the circuit from the rotating magnet to the le4 armature, in order to allow the rotating magnet to snap into place.

   This interaction between the 5RM rotary magnet and the lE relay will continue until either an unoccupied line of the group or is reached ', in the case where all the lines of the group are occupied, the brushes have turned to the last line of the group, In the first case, relay 4H will switch during the time of release of relay lE in a manner similar to that already described, while in the last case, the relay 4H will be unable to make a switch due to a private contact put on.

   earth, as the HS relay will also be triggered given that the lf brush will now not be connected to the earth (last line of a group) the relay 1J will function

 <Desc / Clms Page number 31>

 will therefore operate when the relay lE is finally triggered, the circuit being the battery, wind it from the relay lj the armatures 1f2, hsl, lrn5, le4, 7b2 and the earth in order to complete the circuit for the transmission of the lueuB and from the sign of occupation to the call, to the armature 1j2. In the event that an unoccupied line is found, the subsequent circuit operations will be similar to those already described for the regular two hundred line final selector shown in Figure 8.



   We will now explain the function of the second brush 2f.



   When only one line of the P.B.X. can be used, for example, in the case of trading houses, when the majority of the staff has left, a subscriber wishing to obtain a call will have to make the numbered disc work directly on the available line and at other times. cun movement seeker PBX will be necessary. In this case a P.B.X. will be prevented since the left winding of relay HS is short-circuited through the two brushes If and 2f.



   Referring now to Figure 11 which shows a repeater intended for use between two automatic desks, when the repeater is seized, the 6K relay will operate in series with the AC relay of the common equipment. and will close starting from the battery, the right winding of the relay 6K, the first armature 6kl, the armature 8b5 the springs of the occupancy search jack 7T1 and 7T2 and the earth applied to the conductor 57 by a previous selector. When this earth is removed, the K relay is earthed by the jbl, bc3 and 3d2 armatures since, at this moment, the BC relay of

 <Desc / Clms Page number 32>

 the common equipment will have operated through its upper winding and earth to the acl reinforcement.

   As all the repeaters connected to this common equipment have their private conductors connected together, they are also protected by the earth starting from the contact and common. At armature 6k3, the battery will be applied to positive conductor 58 from the outgoing junction to the remote office in order to operate relay K of the input selector connected to the other end of the junction, the circuit being: the battery, the resistance YH, the armatures jrl, ix5, ac2, 2bbl, 6k3 the positive conductor 58.



  In the input selector the resulting operation of relay K will take place in the battery which is connected to negative conductor 59 of the. junction and this battery will be used to operate relay 1C of the repeater common equipment via the following circuit: battery located on negative conductor 59, armatures 6k4,2bb2 ', upper winding or 3D polarized rela.is line, 1C rela.is winding, ix5 and jr3 armatures and earth. It should be noted that in an input selector for this type of operation the X seal is omitted.

   At the armature ic2 a circuit will be completed for relay IX starting from the battery by winding relay IX, armatures jr4, ic2 and bc4 and la. earth, relay IX is then earthed starting from the battery, by winding relay IX, armatures ix3, ic2, and bc4. To armature ix5, relay IX connects relay le and the top or line winding of relay D in series passing through the outgoing circuit to the remote office and to armature ix2, relay 2J can operate in passing through the reinforcements 3dl and bc4 and / the earth while being blocked by passing through the reinforcement 2j1 independently

 <Desc / Clms Page number 33>

 of the reinforcement ix2. The operation of the rela.is 2J will produce the operation of its relay JR to the armature 2j2.

   It should be noted that the relay B of the common equipment of the input selector to the remote desktop will connect it. earth to the negative conductors of all the selectors associated with the common equipment in order to energize the JB relays of the repeaters associated with them and thus to occupy the repeaters by operating the JBl armatures. The subscriber then activates the number disc and the AC relay will launch pulses and at the ac2 armature will repeat the pulses on the conductors going to the remote office.

   When the AC relay is triggered for the first time, the arma. - ture acl is used to operate relay 7C which on a.r- mature 7cl short-circuits relay IC and the line winding of relay D to provide a control circuit. minimum impedance It will be seen that no conversation capacitor is connected to this pulse circuit and it follows that the repetition of pulses is an improvement over the usual method. Furthermore, the output of the pulse is improved due to the fact that the AC relay is constructed only in such a way as to initiate pulses instead of being a compromise between an efficient pulse relay and an effective relay. high impedance conversation, as is the case in a regular or standard repeater.



   When the switching train has been established at the remote office and the final selector has been put into operation, a ringing sound will be transmitted from this selector and will pass through the common equipment to the calling subscriber on the way. by the reinforcements 6k4, and here), the condenser QC. and the reinforcement 8b2.

 <Desc / Clms Page number 34>

 



   When the called party answers, the final selector in the switch train at the remote office will reverse the battery passing through the junction in the well-known manner and cause the polarized relay to operate accordingly. 3D found in this repeater. At armature 3d2, the auxiliary battery is applied to the trip section until the triggering of the relay JR which will occur after the tripping of relay 2J coming from the operation of the armature 3dl.



  The triggering of the relay JR will disconnect the auxiliary battery from the trigger section at the armature jr5 and at the armature jr2 will determine the operation of relay 8B located in the repeater, the circuit being the battery, the winding of relay 8B . the 6k2 jr2, 3dl, bc4 and la reinforcements. Earth. At armatures 8b2 and 8b3, the repeater battery power relay 8A is connected to the calling line, armature 8b2 also disconnecting the AC rela.is in order to trigger the common equipment. The repeater rela.is 4D will respond to reverse the battery starting from the remote final selector and reversing the call conductor at a.rmatures 4dl and 4d2 will provide the necessary monitoring in the event of an operator calling for the call. hand.

   When the caller puts it back in, places his receiver a momentary earth energizes the relay BC in the common equipment through the armatures 8al and 8b4 in order to ensure that the local private conductor is kept busy until the switches remote desktop have been triggered.



   If a busy state is encountered while establishing the switch train in the remote office, a glow or busy sign will be transmitted to the

 <Desc / Clms Page number 35>

 repeater through the junction. During the first period of the busy signal, as no current will then flow through the junction, the repeater relay IC will trip and allow relay IX to reset. When the busy glow period ceases, the IC relay operates again and activates the 2BB relay, the circuit being the battery, the winding of the 2BB relay, the armatures ixl, jr4, ic2 and bc4 and the earth.

   At armature 2bb3, the busy light is connected to the calling lines via the AC relay winding; at frame 2bb5 keep busy states are applied to the lower coil of relay BC and to frames 2bbl and 2bb2, the circuit to the remote office is opened in order to allow the switches of this office to be put back in place.



   If the call had been to a manual office from a selection floor instead of to a subscriber, the answering equipment shown would be used.



  The rela.is 2LR acts on the private conductor passing through the repeater circuit going to the momentary earth extending from the previous selector. When the 2LR relay is working, it gives a signal to the hand operator by the armature 21r3 connect the ringing sound to the caller by the armature 21rl and the ringing sound capacitor QR and to the armature 21r2 puts ground conductor 64 and provides ground for self-closing through the remote circuit. When the operator responds by putting the plug in the response jack AJ the relay 200 operates and connects the ringing current to the line for the trip period of the 2LR relay in order to operate the MO relay on its winding superior da.ns

 <Desc / Clms Page number 36>

 common repeater equipment.

   The MO relay will close on its lower winding passing through the mol and bc4 armatures and at the mo2 armature operates the repeater & B relay to release the common equipment. By this method, monitoring can be given without spilling the battery by producing count reports. The selectors which terminate the junction can be fitted with time pulse relays for the return of P.G.S. to the selector, if necessary. The common equipment would be identical to that provided for the first selectors with the exception of the dial sound.



   Figures 13 and 14 show a discrimination selector repeater suitable for use with input selectors at a main office where the selectors are controlled by common devices.



   Referring to Figures 13 and 14, it can be seen that when the calling subscriber line extends over lines 10 and 11 to the discrimination selector repeater, relay A is actuated and on armature a completes a circuit to relay B, and armature a2 prepares a point in the pulse circuit going to the switch which is selected in the following.

   Relay B, working with armature bl, connects it. earth to the tripping conductor section 12, in order to fill the circuit and keep the previous switch in operation, on the armature b2 it energizes the polarization winding of relay D in branch D and makes function .. the MD relay, at armature b3 it completes a mo circuit. tor towards the junction finder JFS switch which will be described hereafter and at armature b4 it terminates a point in the excitation circuit towards the vertical magnet VM.

 <Desc / Clms Page number 37>

 



    .The MD relay, working at the mdl armature, prepares another point in the circuit of the vertical magnet independent of the contact v4, at the md2 armature, it bought a circuit to light the monitoring lamp which does not is not of sufficient duration to allow the alarm device in time which is connected to it in series to be actuated, to the armature md3 it connects a ground to the tripping conductive section 12 independent of the contact yl; at the md4 armature it disconnects the starting circuit going to the JFS junction searcher and prepares the switching circuit for relay K and at the md5 armature activates relay J.



  The relay J by operating at the armature jl completes a point in the circuit for the application of the counting potential of an auxiliary battery to the tripping conductor section 12, at the armature j2 it prepares a circuit for maintain relay I which then acts and to armature j3 it supplies an AC blocking circuit to relay MD.



  As a result of the operation of the relay B, the JFM motor magnet is connected in circuit with the search brush P and in the event that the first contact set is occupied, the balance P will encounter a ground which serves to excite the magnet. motor in a circuit interrupted by itself in order to advance the brushes to the next set of fixed contacts. Note that the switching relay K is switched on under these conditions by the earth connected to both sides of its winding. In this manner, the magnet is excited intermittently to advance the brushes in contact with a free junction line as indicated by the absence of earth on the contact touched by the brush P.



   When a free line is found, the control circuit going to the magnet is cut in its continuity.

 <Desc / Clms Page number 38>

 nuity and as the relay K is no longer short-circuited, it operates in series with the motor magnet JFM and at armature kl it is earthed on the tripping conductor section 12. There is Instead of explaining that the resistance of relay K is high enough to prevent the JFM motor magnet from operating in series with it.



  In addition, to the armature k2 an earth is connected to the researcher halai P so as to place the junction monitoring relays JA and JB, the function of which will be described below. At armature k3, another point opens in the circuit going to switch JFS, at armature k4 the initial excitation circuit opens towards relay MD, at armature k5 is prepares a blocking circuit for the relays JG and DA, the armature k6 is prepared the starting circuit passing through the conductor 13, to the generator of ringing and sounds not shown and to the armatures? and k8 prepares the pulse circuit using the brushes and the fixed contacts of the junction finder towards the chosen junction.



   If we now return to the operation of the relay junction monitoring group, we will see the application of the earth to the searcher brush P, the relay JA is actuated and closed and in turn acts to trigger the relay JB which prepares a circuit for the subsequent application of the earth to the finder contact at a subsequent period. In addition, the relay JA, operating at the armature ja3, exerts a commutation through the upper conductor of the junction to complete a circuit for the relays I and D in series.

   It should be explained that the relay K, while working, extends the battery, with the help of a resistor wound in a suitable way on remake IX, to the

 <Desc / Clms Page number 39>

 lower junction conductor in order to produce the operation of a relay K in the input selector not shown, but assumed to be in substance identical to that depicted in figure 5. The relay K in operation in the selector d The input connects the battery by passing through the line relay A in the common equipment passing through the upper connecting conductor in order to activate the relay I in series with the relay D in bypass which is not actuated when connected in this direction.

   Therefore, the relay A of the common equipment of the input circuit and the relay I of the discrimination selector repeater are actuated in series, the former completing a circuit relay B of the common equipment which connects the earth to the ground. using all the selectors associated with the common equipment, to the upper junction conductors extending from them, after which the JB relays associated with the outgoing end of the junctions ending in that selector, are actuated to connect the earth to the corresponding contact of the rows of contacts touched by the brush P of the JFS switches so as to mark these junctions as being occupied.



   Relay I by operating in the discrimination selector repeater to the armature it adds the earth connected by the armature b2 and to the armature 12 operates the relay IX by passing through its left winding. The IX relay when working closes using its ixl armature, at the ix2 armature it disconnects the resistance battery from the lower junction conductor and at the ix3 armature it connects relays D and I in bridge with the junction circuit.

   Under these conditions, a distinctive sound indicative of the condition of the operating state.

 <Desc / Clms Page number 40>

 The dial is returned to the junction line starting from the input selector located at the main office and when the called subscriber hears this sound, he will begin to mark on the dial the first digit of the desired number. .

   In the case, however, where all the junctions extending from the JFS junction finder are occupied,:. the switch brushes will automatically be rotated into contact with the last sets of fixed contacts which are wire-free from the point of view of a trunk connection and in order to provide the calling subscriber with the opportunity. to terminate its connection, in the event that the call must be established via the local train of switches, means are provided for the transmission of a dial signal using the rest fittings j5 and j6, the fixed contact and the brush from the JFS switch to the upper conversation conductor.

   No other circuit change will take place until receipt of the. first series of pulses, after which relay A is actuated - in synchronism and at each de-energization, the following circuit is completed to energize the vertical magnet VM in parallel with relay C to the battery and in parallel with it using the hl and jd3 fittings the winding of the vertical magnet VM towards the battery. In addition, yet another connection path can be traced starting from the winding of the vertical magnet using the armatures ld5 and jgl to activate the relay JG which then disconnects itself starting from the circuit. pulse and earths to the k5 armature.

   In this way the vertical magnet is excited so as to lift the shaft and the brushes to the desired stage corresponding to the number of pulses in the series and it should be explained that the 0 t B relays are fitted

 <Desc / Clms Page number 41>

 each of pieces of copper surrounding their cores so as to allow them to be kept in operation continuously throughout the pulse period. The relay C by functioning prepares, at the armature cl, a circuit for the relay G, at the armature c2 it connects a ground to the tripping conductor section 12 and to the armature c3 switches on the relays D and 1 in order to provide a more active pulse circuit to the upper switch which is controlled by armature a2.

   During the first vertical movement, the normally open springs are put into operation then at springs N1 opening a point in the circuit towards the OA relay which is not active at this time, at the springs N2 it closes a point in the circuit towards the trigger magnet ZM and to the springs N3 completed a circuit to operate the relay G which closes using its armature gl and at the armature g2 it completes a point in the circuit excitation going to the rotary magnet RM. At the end of the pulse train, the brushes of the discrimination selector repeater and those of the input switch to the remote office will be raised to similar levels and as relay A is then kept in operation for an extended period,

   relay C will be triggered after a short interval and at armature C1 completes a circuit to the rotary magnet RM with the aid of which the brushes are advanced so as to come into contact with the creamer set of fixed contacts. It should be explained that the lower search brush 2P is reserved for discrimination with regard to the type of connection desired depending on the number of digits put on the dial, and for this purpose, the first contact of each stage is connected by wire. to a transverse connection frame so that by a jump

 <Desc / Clms Page number 42>

 As appropriate, the class of call, either local or remote, can be chosen and furthermore a digit absorbing feature is available which allows the first digit of any series to be absorbed.

   The conductive system of the first fixed contacts going to the transverse connection frame is associated with the 2P brush shown in detail in the drawing and this can jump to the terminal points designated by a, b, c, e or f depending on the class of the desired call.



   If we now assume that the first 2P contact located on the chosen floor is transversely connected to terminal point a, relay JD will be actuated and closed and at armature jd2 the circuit of relay G opens for the automatic rotation of the brushes ends, at the jd3 armature the vertical magnet circuit opens so that it will not be affected by subsequent trains of pulses, at the jd4 armature the JG relay is triggered , at armature jd5 a point is prepared in the circuit going to the monitoring lamp LP and at armature jd6 a circuit is completed for the transmission of a busy signal to the appliance. peeling in the event that a free junction is not available at this time.

   Subsequent series of pulses are then repeated by Relay A to the main office to control the placement of switches at that office for connection completion.



   In case the 2P contact is cross-connected to terminal point b, the same series of operations will occur. In the event that the 2P contact is cross-connected to terminal point c, a circuit is completed for the DA relay which operates and closes to roughly bring the characteristic absorbing the digit.) Further, to

 <Desc / Clms Page number 43>

 armature da2, a circuit is completed for the operation of relay OA, when the switch reaches its normal position, at armature da3 the triggering magnet ZM is energized to bring back the shaft and the brushes to the. normal.



  When the normal position is reached, the OA relay is actuated and closed using its OAl armature located in an independent circuit, at the Oa2 and Oa4 armatures it modifies the normal conditions produced by the connections to the terminal points and to the The armature oa4 extends the terminal point c to the terminal point f, so that in case the second digit put on the ca.dran is the same as the first, the relay itself JD or LD can be actuated to determine if the call is local or remote and at armature oa5 the trip circuit is open.



   If the 2P contact is cross-connected to terminal point e, the LD relay is actuated and blocked in order to prepare the circuit for a local call.



  In addition, at armature ld2 the original excitation circuit is open, at armatures ld 3 and ld 4 the switching relay H is connected in circuit with the upper search brush 1P, at the armature ld 5, the original excitation circuit is open to relay JG, at armature ld 6 the rela.is K is triggered to release the junction circuit, at armature ld 7 the earth is maintained to the searcher contact located in the rows of searcher switches until the moment when the JG relay is returned to its position after its disconnection by the K relay and at the armature ld 8 another point is prepared in the circuit going to the LP surveillance lamp.

   Under these conditions the common equipment associated with the input selector at the main station is also triggered by thus disconnecting

 <Desc / Clms Page number 44>

 the. earth of the upper junction conductor of all the associated junctions, in order to replace all the JB relays, thus removing the occupation state of these junctions. In addition, following the disconnection of the earth brought through the P brush of the JFS junction finder in question, the JA relay is triggered and is followed after a short interval by the JB relay. In this way, the earth is connected through the ja2 and jbl fittings to mark the junction finder as occupied so that the device, at the main office, can be completely replaced before the junction line. is made available at the satellite office.

   If then reference is made more particularly to the case where the relays DA and OA are actuated in response to the first series of pulses, it will be assumed that the switch is actuated by the second series of pulses in a position in which the earth extends through the 2P brush to terminal a. In this case, the rela.is LD is actuated and closed so that the call can be terminated locally and as the relay H is now connected in circuit with the upper search brush LP it will remain short-circuited until the moment. where this brush meets a free outlet or when the brushes are moved to their eleventh rotating position.



   If we first consider the case where a free output is found, relay G will not be activated again due to the absence of earth on the searcher contact and since the short-circuit is eliminated. - m from the winding of the switching relay H, this relay will work in series with the relay G. The resistance of the rela.is H is high enough to prevent fornction-

 <Desc / Clms Page number 45>

 relay G under these conditions.

   Relay H on the other hand opens at armature hl the circuit to vertical magnet VM so that it will not be influenced by the following pulses, at armature h2 opens the initial circuit of excitation towards the rela.is G so as to prevent other pulses of rotation, to the armature h3 the earth is directly connected to the IP search brush so as to set the chosen switch to occupation, to the armature - re h4 opens the initial excitation circuit for the MD relay which is however kept in operation using the resting armatures d3 and the j3 armature put into operation,

   to the armature h5 opens a point in the circuit then towards the magnet ZM and to the armatures h6 and h7 extends the impulse circuit with the help of brushes and fixed contacts towards the upper switch.



   If we now consider the state in which all the outputs of the chosen stage are occupied, the brushes of the switch will be placed by rotation then in the eleventh position where the springs are controlled, thus disconnecting the SI springs from the relay switch H of the IP searcher brush and to the S2 reports completes the circuit for the transmission of a busy signal by the upper conversation conductor in order to inform the calling subscriber that the desired connection n is not available.

   Relay H can operate under these conditions to accomplish the functions already described and, in addition to the h3 armature, it directly connects the earth to the IP searcher brush so as to operate an OVM excess counter which is common to all eleventh contacts in order to record excess calls on these floors.

 <Desc / Clms Page number 46>

 



   Now considering a successful completion of the desired connection, when the called subscriber answers, the current flow in the outgoing conversation conductors is either conducted through the trunk lines or is reversed through a local connection after which the bypass relay D is actuated, at the frame dl a point in the circuit going to the opens.

   monitoring lamp LP, at armature d2 a point is prepared in the counting circuit and armature d3 opens the holding circuit to relay LD. The MD relay trips after a short interval and in turn opens the circuit to the J relay, and during the slow trip period of this last relay, the potential of an auxiliary battery is connected to the trip conductor section 12 to perform the operation of the meter of the calling subscriber in general.



  After complete tripping of relay J, the earth is again connected to the tripping conductor section 12 and another point is open in the blocking circuit going to the MD relay. Note that the MD relay is fitted with a piece of copper in order to introduce a delay into the. connection of the counting circuit thus avoiding the possibility of false counting in the event that the bypass relay D inadvertently oscillates due to jumps of the condenser in the line circuit. In the event that local subscriber connections are necessary to set the "0" on the dial in order to obtain access to a survey operator and so that this connection is not counted the switch is provided with springs designated by the drawing as MP and arranged so as to be actuated when stage "0" is marked on the disc.

   The operation of

 <Desc / Clms Page number 47>

 these springs provide an alternating holding circuit going to the MD relay so as to eliminate the counting characteristic.



   At the end of the connection, when the caller becomes free, relay A is triggered and it is followed shortly after by relay B, and if the connection has been completed by passing through the brushes of the discrimination selector, the relay H will follow the trip of relay B and complete a circuit for the trip magnet using the quiescent armatures al, mql b5, h5 and the normally open N2 springs actuated, the trip winding ZM and the battery.

   It will be seen from the drawing that the tripping magnet is provided with a set of springs designated by zml arranged so as to connect the earth to the tripping conductor section 12 during the tripping movement so as to prevent the switch. to be gripped again until the brushes and the device are completely returned to normal.



   In the event that the connection has extended over a trunk line, relay K follows the triggering of relay B and completes a circuit to the junction finder switch JFS using earth to armature md2, the base plate and the brush H, the armatures k3 and b3 the switching springs jfm the motor magnet JFM and the battery. The brushes are thus automatically rotated in the starting position where the starting circuit is open.



  When disconnecting the earth of the P brush and the fixed contact of the JFS switch, the junction protection relay is tripped and to its rest armature ja 2 again applies earth to the searcher contact for a short interval of time represented by the slow period of de-

 <Desc / Clms Page number 48>

 triggering of the JB relay to ensure that the machine at the main office is completely restored to normal before the junction is again taken into use.



  In the event that the called subscriber becomes free and the calling party continues to maintain the connection for an excessive length of time, a circuit will be completed using the idle arrays md2, dl and alternately yd5 or ld8 for switch on the LP monitoring lamp which is on with the delayed alarm. If the condition persists, the delayed alarm device will operate after the period for which it is set to provide a common alarm which together with the switching on of the individual LP lamp allows the erroneous connection to be made. 'be located.

   On the other hand, in the event that the switch is seized but the calling subscriber does not operate the number disc within a specified period of time, the LP monitoring lamp will again be turned on in series with the dialing device. The alarm is delayed by passing through a circuit formed using the armature put into operation md2 and the armatures in rest jg6, jg5 and 1d8.



   In the event that the calling subscriber releases his connection during a busy light condition or as an alternative when the call is completed using a hand panel, the battery will be connected to one or two junction conductors from the device, located at the remote office to maintain the connection.



   If we now consider that the circuit operations are accomplished, relay A when tripping causes relay C to operate again to maintain a protective earth at the tripping conductor section 12 and after tripping of relay B the: earth is con -

 <Desc / Clms Page number 49>

 nected using the armature put into operation j2 at the central point of the windings of the ID relays so that these can be energized in parallel with the battery connected through the lower junction conductor. The relay I when operating maintains the MD relay in order to maintain the connection and this state will continue until the signal or glow period is over or alternatively when the operator releases his connections.

   Similar conditions will also be obtained in the event that a local connection is established using a manual switchboard.
CLAIMS:
I. - For use in a telephone system, a group of similar parts of automatic switching devices, each provided with a relay for connecting the corresponding part of the device to control devices common to the group, in which the common apparatus comprises a relay arranged so as to be actuated in series with any of these link relays.



   2.- For use in a telephone system, a group of automatic switches associated with common control devices comprising a common line relay which can be actuated in series with a winding of a relay in the line. 'any of these switches.

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


    

Claims (1)

3. - For use in a telephone system, a group selector switch associated with common devices can control a group of these switches, in which a test relay placed in the common device can take turns trying a number of the test brushes of that switch. <Desc / Clms Page number 50> 4.- For use in a telephone system, a group selector switch associated with common devices arranged in multiple assembly and capable of controlling a group of these switches, in which the common device, being functionally associated with this switch for a predetermined period without responding to impulses, is arranged so as to cause this switch to transmit a distinctive signal to the caller. 5. - For use in a telephone system, a group selector switch associated with common devices capable of controlling a group of these switches, in which the common device being operatively associated with this switch for a period of time. determined in advance without responding to impulses, is arranged so as to bring the movement of this switch to a predetermined position in order to transmit a distinctive signal to the calling party. 6. - For use in a telephone system, a final selector switch associated with common devices can control a group of these switches, in which the intervention of the potential of an auxiliary battery in In order to control a meter via the lead test lead to this switch is carried out in the common control unit. 7.- For use in a telephone system, a final selector switch associated with common devices capable of controlling a group of these switches and having access, via a set of brushes, to groups of switches. lines going to private branch offices and, via a second set of brushes, to <Desc / Clms Page number 51> individual lines, in which the set of brushes taken in service depends on the path on which the switch is taken in service. 8. - For use in a telephone system, a final selector switch associated with common devices capable of controlling a group of these switches and having access, via a set of brushes, to groups of lines going to private branch offices and, via a second set of brushes, to individual lines, in which contacts controlling the seeker movement of the switch through a group of lines are connected only when the switch is turned on. vice on a special route. 9.- For use in a telephone system, a final selector switch associated with common devices can control a group of these switches, in which this switch has access to groups of lines and can , under the action of a relay in the common equipment, exert a seeker movement on a group of lines, when it is placed on the first line of the group under the action of digital pulses. 10.- For use in a telephone system, a final selector switch associated with common devices which can control a group of these switches, in which the common device comprises a relay which can operate and transmit a signal. "busy" on the calling line when the selected line does not answer. 11.- For use in a telephone system, a group of pulse repeaters each arranged so as to be controlled by devices common to the group and can be associated with the common device by <Desc / Clms Page number 52> the action of a proper repeater relay. 12. - For use in a telephone system, a group of pulse repeaters associated with common control devices comprising a common line relay which can be controlled in series with a winding of a relay at the same time as any of these repeaters. 13.- For use in a telephone system, a pulse repeater associated with common devices can control a group of these repeaters, in which the pulse repeater relay is placed in the common device. 14. - For use in a telephone system, a pulse repeater associated with common devices capable of controlling a group of these repeaters, in which the pulses are repeated through a low impedance loop circuit extending from the common apparatus. 15.- their use in a telephone system, a pulse repeater associated with common devices able to control a group of these repeaters, in which the common control equipment can be disconnected from the repeater under the action different signals received in return by passing through the outgoing line. 16. - A telephone system comprising a certain number of groups of lines each normally served by a corresponding paging group divided into sub-groups, in which the sub-groups of seekers are arranged so as to serve the calling line. of a particular group in a determined order, the first subgroups of researchers of all groups being taken into service before the second subgroups of researchers are. <Desc / Clms Page number 53> 17.- A teleohonic system comprising a group of searcher switches arranged so that they can be taken into service in turn, passing through a selection switch that can first choose a free searcher equipped with a ba. test lai to try researchers in a subgroup and a second test bplai to try researchers in a second subgroup arranged in such a way as to be taken into service only when all researchers in the first subgroup are busy. 18.- A telephone system comprising a certain number of groups of lines each normally served by a corresponding paging group divided into sub-groups, in which the outgoing conductor of a group of lines is arranged so as to s 'extend in turn to successive subgroups of seekers in a determined order as the subgroups become occupied. 19. A group of like parts of an automatic switching apparatus as claimed in claim 1, wherein said relay is pulsed independent of the individual switch relay. 20. - A group of automatic switches according to claim 2 in which, when the switch is fully set in position, the circuit of the two relays is cut off, after which they are triggered and disconnect the control unit. common switch. 21. A group of automatic switches according to claims 1 and 2, in which the magnets controlling the switching mechanism are associated with the common apparatus by passing through contacts controlled by the movement of the switch. . <Desc / Clms Page number 54> 22. A group selector switch according to claim 3 in which the test relay can test first by going through a test period and if a busy state is encountered, close a test circuit via the second test brush, 23. A group selector switch according to claim 22, wherein when an occupied state is encountered by a second test brush, the blocking winding of the test relay is. shorted so as to force this relay to trip and close a circuit of the rotating magnet which moves the switch brushes to the next set of contacts. 24. A group selector switch according to claim 22, wherein when the second test brush encounters a characteristic potential of a free line, the corresponding switching relay operates and the test relay remains in operation through its locking winding in order to prevent any subsequent operation of the rotating magnet. 25.- A group selector switch according to claims 4 and 5 in which circuits are closed for two relays in the common apparatus successively, the circuit of the second relay being closed only if the appli- cant does not operate the disks. to numbers during the predetermined period, when this relay operates, and closes a circuit for the vertical magnet which moves the switch brushes by one degree, after which the switch automatically searches on the first level, for sound equipment d 'an unobtainable number. 26. A group selector switch according to claim 25 wherein the second relay is only kept in operation for a short period at the <Desc / Clms Page number 55> end of which this relay trips and opens the circuit of the vertical magnet. 27. A group selector switch according to claim 25 wherein if the caller begins to operate the number risk within the predetermined period, another relay acts to open the circuits of these two relays. 28. A final selector switch according to claim 6, wherein when the called subscriber responds, a relay of the common apparatus operates and establishes the link with an auxiliary battery potential via the test lead. during the slow tripping period of another relay. 29. A group of pulse repeaters according to claim 12, wherein said relay is arranged to respond to pulses independent of the relay of the individual switch. 30.- A pulse repeater according to claim 13, in which this relay has a low impedance while a relay (.'- 'high impedance is provided in the pulse repeater, with a view to '' supply a battery for the calling line. 31.- A repeater of impalsions according to the. claim 14, in which this repeater comprises a high impedance relay for supplying a battery for the called line. 32. - A pulse repeater according to claim 15, in which when the outgoing line leads to a digital switch, a signal is fed back through the line to disconnect the common control equipment, the switch and , when the outgoing line leads to an operator position, a different signal is returned by the line for the same purpose. <Desc / Clms Page number 56> 33. A pulse repeater according to claim 32 in which when the. outgoing line leads to a digital switch, direct current is returned through the line while if the outgoing line leads to an operator position, alternating current is returned through the line. 34.- A telephone system according to claim 17 in which when the selector switch finds a finder free of earthing potential, earth is brought from the selector switch to operate the common line relay associated with the switch. digital to which the finder is connected. 35. A final selector switch according to claim 9, wherein if the switch is set by the action of digital pulses on a line of a group other than 1a. first or the. last this relay is made inactive to prevent the switch from searching on the group. 36.- For use in a telephone system, a group of automatic switches which can cooperate with digital input switches according to claims 2 and 3 in a remote office through a number of trunks to two-wire, in which when the common control apparatus is associated with a digital input switch taken into service via a two-wire junction, means are provided in the output switches in conjunction with the switches digital remains in the group through the two-wire junctions, in order to place an occupied state on these junctions. <Desc / Clms Page number 57> 37.- For use in a telephone system, a feed selector switch associated with common control devices which can be operated via a pulse repeater according to claims 11 and 12, in whereby when the repeater is associated with the common control apparatus, a circuit is closed for a relay in that switch, which serves to associate that switch with the common control apparatus. 38.- For use in a telephone system, a group selector switch associated with common devices capable of controlling a group of these switches in substance as described and shown in the accompanying drawings. 39.- For use in a telephone system, a final selector switch associated with common devices can control a group of these switches substantially as described and shown in the accompanying drawings. 40.- For use in a telephone system, a pulse repeater associated with common devices capable of controlling a group of such repeaters substantially as described and shown in the accompanying drawings 41. A telephone system substantially as described and shown in the accompanying drawings.