BE376784A - - Google Patents

Description

       

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  Automatic relay telephone system applicable to rural networks.



   Automatic relay telephone systems have already been imagined for rural networks, systems comprising a single two-wire circuit (omniburs lines) going to the manual exchange and a single circuit with two wires (omnibus lines) going to the exchange. rural next.



   However, practice has shown that the arrangement with a single arrival circuit and a single departure circuit is insufficient and that it is essential, in order to ensure the normal flow of traffic under good conditions, to have access to a sufficient number of arrival and departure circuits (omnibus lines) in each rural exchange.

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   The present invention relates to a novel automatic relay telephone system capable of satisfying the. above condition, which system is organized so that one can serve a network comprising any number of rura'x exchanges connected to a manual exchange and staggered over any number of circuits with two conductors @ each (omnibus line), said exchanges being able to have any number of local subscribers.



   This result is obtained with the aid of a new automatic rural exchange which constitutes the invention itself.



   In the accompanying drawing there is shown schematically and by way of example only an automatic rural exchange established in accordance with the present invention.



   Figure 1 is a schematic example of a rural network that, despite its complexity, can be served using the new system.



   Figure 2 shows schematically the general arrangement of the arrival circuits, the departure circuits and the circuits of rural subscribers in an automatic rural exchange of the new system.



   FIG. 3 is a general diagram of an automatic rural exchange represented in more detail in FIGS. 4 to 12;

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Fig. 4 shows part IV of FIG. 3;
Fig. 5 shows part V of FIG 3;
Fig. 6 represents part VI of FIG. 3;
Fig. 7 represents part VII of FIG. 3;
Figs. 8, 9 and 10 show one of the individual bus line selectors;
Fig. 11 represents the calling line distributor;
Fig. 12 shows a cabne plugged into one of the bus lines going from the manual exchange to the first automatic rural exchange;
Fig. 13 represents the essential organs provided for the manual exchange for the control of the automatic rural exchanges of the network.



   Figures' 4 to 13 actually form only one on which can be read the various claims, we could have numbered them 4a, 4b, and * .... we preferred to give them successive numbers. to make it easier to read.



   The description which follows relates to the organization of. any one of the automatic rural exchanges CR of FIG. 1, figure on which or. designated by my a manual exchange, by OR, CR1, CR2, CR3 CR4; CRa 'of the automatic rural exchanges of the network dependent on the aforementioned manual exchange and by AB of the subscriber stations connected to the various exchanges connected to each other by means of any number of LO omnibus lines with two conductors, hecu @

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Each CR automatic rural exchange is organized so that the bus lines going to the manual exchange (or to the previous rural exchange) are first crossed by the omnibus lines going to the following rural exchange (s). then crossed,

   after passage on translators, by the subscriber lines.



   This arrangement, visible in Figure 3 (overall figure of Figures 4, 5, 6 and 7) is shown schematically more particularly in Figure 2 where we denote by LO the bus lines going to the manual central MA or to the preceding rural exchange and those going to the rural exchange (s) CR by Tr the translators mounted on the omnibus lines going to the MA exchange and by LA, the subscriber lines.



   In Figures 4 to 12, which show in detail an exemplary embodiment of a rural exchange, certain circuit connections have been indicated by Roman numerals for the figures and by Arabic numerals surrounded by 3'-a circle for the drivers. (Thus, for example, the indication VIII placed in front of a brace embracing one or more ends of conductors bearing a circled number, means that these conductors must be connected to the conductors bearing the corresponding numbers. dants in figure 8) Arabic numerals @@@

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 circled are used to identify the different circuits.



   In the new system which will be described briefly below and whose operation will then be indicated at the same time as the details of the circuits, each individual item of subscriber equipment, equipment located at the rural exchange, is made up of a call relay D, by a local communication relay A and by as many connection relays 0 as there are bus lines La going to the manual exchange MA (figure 6). Each subscriber station (not shown) comprises, in the case considered here, a line capacitor and a call magneto.



   The LO omnibus lines which go to the manual exchange and which are organized in such a way that one of them can only be occupied by one station at a time each have a test relay J., a test relay. conversation K, a call relay L (fig. 6 and '7) and as many groups
 EMI5.1
 relay M and N (Ul 'Ni,' 1 M2, N2, I, S '2, N'a etc ..) that there are lines going from the rural ventral considered to the following rural exchanges) fig. 4 and 5).



  Each LO omnibus line arranged entered
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 the manual central MA and the first C9 {1L, 'e.,

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 rural OR (starting from the manual exchange) can optionally be fitted with a plugged-in cabin (fig. 12).



   Each omnibus line has, in the rural exchange, an individual selector (fig. 8,9 and'10) made up of eight control relays (fig. 8) namely: a line relay a, a repeater relay h, a, even numbering relay q, an odd numbering relay d, a guard relay e, a desimal order command relay f, a units pointing relay and a tens h pointing relay.



  This individual selector also comprises, on the one hand, as many relays of tens a (fig. 9) as the exchange has tens of subscribers and, on the other hand, ¯ ten relays of units i, j, k , l, mno p, q, r (fig. 10)
The equipment of each of the LU- omnibus lines going from a rural exchange to the following rural exchanges comprises eight relays, namely: a local communication relay 0, a guard relay P, a circuit connection relay relay Q, a relay for connection to the local communications listening circuit R, a release relay S, a switching relay for the guard circuit T, a local switching relay U and a relay call V (fig. 4).



   There is also in each rural center a distributor of calling lines (fig. 11) common to all the omnibus lines going to the manual exchange, which distributor has the function of connecting the calling stations to all roles. at- ur

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 free bus lines going to the central manue 1.



   This calling line distributor is made up of two control relays Z1 and Z2 and as many Y connection relays (Y1 'Y2' Y and) as there are subscriber stations and omnibus lines going to the exchanges. rural areas.



       Each automatic rural exchange which has its local battery (which can be charged from the manual exchange) is completed by one or more local connection circuits, circuits formed by five relays E, F, G (fig. 7) W, X ( fig. 4) and by as many local setting relays H (fig. 6 and 7) as there are LO omnibus lines from the central considered to the manual central.



   All these organs are organized and interconnected in the manner shown in the figures of the drawing.



   The different automatic rural exchanges spread over a bus line or a network of several bus lines are similar and their organization is planned for the following operating mode:
To call the maxue MA switchboard (in order to have a telephone call
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 1 subscriber rura du central -.JL # 1 rural CR, y for example, 1:?: B; {= born = ,,,,, t a :; start his call recorder without picking up his handset; . then it waits to be called. '' If at this time all the bus lines going to the manual exchange

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 are occupied, the call body of said subscriber puts itself in the so-called 'call body' position.



  The fact that one of the eenibue lines is free triggers the triggering of the calling line distributor, which distributor automatically begins to search for extensions when there is a call and connects them to all roles, in their numerical order, to the bus lines going to the manual exchange.



   This distributor - the calling lines is organized in such a way that it does not "return" to ri "1" until after having "explored" all the other numbers existing at the rural exchange; this way the @an post is not favored at the expense of another post.



   When the calling station is connected to the omnibus line going to the manual exchange, a call lamp (corresponding to the omnihus line in question) lights up in front of the operator of the manual exchange. From this moment the considered omnibus line is occupied and no other station can connect to it.



   If the aforementioned requesting subscriber had been part of the rural exchange CR4 'he would first have connected on a going omnibus line. to central OR, - then on a bus line going from central CR3 to central CR2; from the central GR2 it would be connected on a line going to the central OR1 and finally on a 'bus line going from the contract CR1 to the central manuelMA and this; as and A masure de la. release of each of the sections of the considered bus lines. :

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Warned by the light signal, the operator Inserted her plug into the jack of the bus line corresponds to said signal and sends, using a switch, the inrush current on this bus line.



   This in-call current is directed directly to the caller's ringtone, since only the latter is connected to the relevant bus line going 'to the manual exchange. The caller can then pick up his handset and ask for his number. If the number requested corresponds to a subscriber of the same rural exchange, the telephone operator can, using her call dial, connect the calling party to the local circuit of his rural exchange, after which she "dials" the number of the requested station. and ring it.



   When the called subscriber picks up his handset, it is automatically connected to the local circuit of the same exchange and the conversation can be initiated under the control of the operator. When the latter has noticed that the conversation has started, she removes her plug and thereby frees the circuit going from the rural exchange to the manual exchange which becomes available again. The release of the circuits of the omnibus lines is therefore only controlled by the operator.



   In what follows, we will move on to a detailed study of the different circuits of the new system at the same time as we will explain its mode of operation in the different cases which may arise, to know:

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1 / Call from the operator of the manual exchange MA by a subscriber of the rural exchange CR1; 2 / Callback of this subscriber by the so-called manual central operator and "localization" of this subscriber;
3 / Selection of a subscriber of a rural exchange by the operator of the manual exchange;
4 / Call from the telephone operator of the manual exchange by a subscriber of the rural central CR2:

   
5 / Callback of this subscriber by the telephone operator-,
6 / Establishment of a communication between a subscriber of the rural central CR2 and a subscriber of the rural central CHA "
7 ./ Establishment of a communication between a subscriber of the rural exchange CR1 and a subscriber of a rural exchange forming part of another sector connected to the manual exchange.



   Let us indicate that, as will be seen later if a bus line is busy, the relay J @ or one of the relays; M of this line comes to. job,. If we assume that the subscriber? 24, which in the following will sometimes be called second subscriber, calls, by activating its magneto ,. it sends on its line 50, (fig. 6) a current in its relay D which comes to work and is hooked by-51, line 52 (this line being multiplied on all the subscribers of the station) .. and relay B who comes to work -
When one of the C1, C2 or C3 relays of the 2nd subscriber will operate ,. 1''langage will be cut and relay D will return to idle., Coming to work from rolai

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 B sending of current + directly to wire 27 and indirectly to wire 26;

   the current of the wire 26 is given to it by the line 53 which is found multiplied on the various omnibus lines LO1 'L02, LO3 etc .; going directly to the manual central.



  If one of these lines, LO2 for example, is free, relay J2 as well as relays M2 and N2 relating to this line are at rest and line 53 is connected to a positive pole of the battery by: 'paddle of J2 at rest , 54, M'2or rest palette ,.



  55, M2 pallet at rest, positive pole 56.



   As a result a positive polarity is put on the two wires 26 and 27; in the event that no line going to the central would be available, the wire 26 would be isolated.



   It will be assumed in what follows that line LO1 is busy.



   Current from wires 26 and 27 will be used to operate the call line selector shown in FIG. 11, and whose operation is as follows:
The selector comprises two relays z1 and Z2 and relays corresponding to the various subscribers of the rural exchange, Y1 to the first subscriber, Y2 to the second etc ... and also to the lines leading to this center OR1 and coming from other rural exchanges CR2.



   The two relays Z1 and Z2 function suc- cessively as follows;

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The current of 26 activates Z1 which comes to work, Z2 being at rest, Z2 is then activated and then cuts Zl, this cuts Z2 in turn and the same cycle begins again ,,
In a cotto way, designating with ¯! the working position and r the rest position so that
 EMI12.1
 Zl..t will designate the Zl relay at work and Zn.-r the Z2 relay at the ropos, we will have the following four combinations & s which appear successively as soon as the current is sent to 26:
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 1 - Zi - t Z2 -. r 20 -. zi - t Z2 - t 3 - Zl - r Z2 - 4 - 1 'r. Z2 ¯ r then the cycle begins again.



   At time 2, the positive 26 is connected by 57 to the relay Y1 provided that the other bugs are at rest. If a Y6 relay case, for example, was in the working position, the positive pole was managed connected to Y8,
If we assume all the relays Y at rest, the positive 26 will be connected to Y1 which will come to work and will hang on through 58 and 27 (in the event that the Y7 relay would have worked, it would be @e same relay Y7 which would hang by 58 and 27).



   Y1 when coming to work connects to the ball - by
 EMI12.3
 its three pallets the studs cl, 02e 5 ro13,> r with the studs 59,60,61 of the rolais D of the first a @ cn @ 2
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 this . 23) this relay D being at rest-rion no so

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 product. Yi also connected relay Y2 by 62 to line 62.



   On the third tomps, Y1 remains hooked.



   At the fourth tomps, 63 is found connected to 26 ,, the relay Y2 is then activated, it cuts the hooking do Y1 by 58 ,, @@ ot connects to the negative polo by c1 c2c3 las three pads 59, 60, 61 of relay D of subscriber base N 24.



   At this time this Frelais D being at work the current arriving by key, c2 'c3do Y2 will actionnor, as will be said later, the r3lais C2 corresponding to the ligno LO2 which is free, the relay c2 coupo-, ra the fastening current of the rolais D; as this current activates the rolais B, this will come to the ropos by cutting 26 ot 27 co which sprinkles the selector of fig. 11.



   Lo séloctour has therefore connected to the pole- the 59,60,61 plots of the calling subscriber rolais we know on the other hand that there is a line available, otherwise the selector of lines not receiving current par 26 would not have worked, we also assumed as an example that the LO1 ligno was occupied and the LO2 ligno free.



   We will see that then the rolais C1 of the second subscriber does not function ot quo C2, on the contrary fonetionnora.



   For function C1 must find a positive pole on ligno 64, multiplied on all relays C1 cotto ligno is connected to 24 (fig. 8), contact do 'rupos of the o rolative relay to LO122 Fig.6) rolais pad J1'

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If the line LO1 1 is occupied by a subscriber of the rural contral considered lo relay J is at work ,. as we will see later; and consequently the eircuit is cut; if on the contrary Lo1 is occupied by a subscriber from another rural exchange, it is as we will see later one of the DO rolais MN groups of cotto ligno LO1 which is at work, in this case the circuit considered which was continuing by 65 ost cut by one back relay M1 or M 'ot no pout so connector to positive 66.



   From 24, an autro path was offered to the current by the paddles ot plots back rolais M but co chomin is either cut by a do cos rolais, or onvoie on back isolated plots.



   It ost to notice that the arrival in working position of a relay M of the line LO1 has for offot to connect 10 positive polo 66 to the ligno 67 which brings it to the palotto 68 of the relay M2 which played for the ligno Lo2 2 the led role quo the corresponding palotto do M1 and, consequently if LO2 is occupied, returns cc positive polo on line LO3 ot thus do suito, Lo rolais C1 could not therefore be connected to a positive polo ot by suito is rosté with ropos,
Lo relay C2 has on the contrary by an identical circuit (relating to LO2) found the positive pole which viont to be carried in 68 and by suito functioned.



   Co doing:
1 / he coupo las circuits do D and do B which return to rest,

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2 / it clings thanks to the negative pole 69 next to it ot to the positive pole that it found by: palotto 71., ligno 72., relay J2., Which is activated, 23 (fi7 ot 8), contact do ropos of the rolais o, wire 73, 74, oontact do ropos of the relay f ot positive pole 75.



   The relay j2 being at work, he kept the line Lo2 because we saw in connection with c1 that a relay cn of a subscriber could not work if the rolais jn is at rest.



   3 / he uses the ligno 50 of the second subscriber in direct communication with the translation do LO2 '
While at work, J2a put the relay L2on report with the son 54 ot 55 ot consequently avoc the positive polo 56; it follows that L2viont one working position ot co making puts the wire 76 of the ligno L02 on 28 (fig. 7 ot 8) ot by suito on the pole, - because lo relay o ost at rest.



   There is therefore a negative polarity on lo wire 76, referring then to fig. 13 which represents the diagram of the manuol central unit, we see that the negative polarity cotto on the wire 76 has the effect of turning on the call lamp 77 through the intermediary of the relay t.



   The telephonist then inserts his card into the jack which has the effect of lighting the lampo do sup- port by + 78, ring of the jack, body of the card.



   Ello then activates his call key which activates the ringing tone of the calling subscriber via the translatour do Lo2.



   This subscriber then picked up, and only then, his handset.

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   Co doing, he formed the circuit of which the line 50 is part and by suito allows the relay K2 to operate, if this one comes to work: short-circuits the capacitor 79 co which establishes a communication between the soft wires of the line LO2
This has the effect of the manual control panel do pormottro the function of the double onroulomont SP1 relay which extends the suporvision lamp; cola warns 'the naked operator the subscriber has picked up ot that ollo can talk to him} she abaicao his listening key ot the request lets him know' r,) '1,' subscriber with whom he wishes to be placed on communication.



   We are going to examine the operations which make it possible to establish cotto communication; Let us first suppose that the do @ andé subscriber is connected to the same rural contrai as the domandour subscriber.



   The telephonist will proceed to gentle successive operations:
1 / Ello will put the requestor on local, that is to say, on communication with the local line 134 of his contrai, (marked on dashed lines on the figures.



  4,5,6,7) For that it will be put in relation with the line LO2 by its listening key ot will dial the number eleven which in the current system corresponds to communications other than subscribers of a dreary rural contrai, then it will dial the number of the subscriber who is dominated and who will also be communicating with the ligno localo 134. The soft subscribers can then cause ontro orx .. the operation - Local setting of the calling subscriber.



  Gette sop operation done by means of devices

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When the telephone operator, after having inserted her plug into the jack, has lowered her listening key, the polarity - of 81 (fig. 13) sent by CN and 82 on conductor 76 of line LO2 and there (fig. . 7) on 25 (fig. 8) thanks to the short-circuiting produced by K2 which brings to work a and b and consequently e and c since all the other relays are at rest.



   The particular LO2 selector is then ready to receive the pulse from the manual exchange.



   These successive pulses will be sent as follows:
When the operator presses the button
BL the positive 83 is sent to RC which comes into working position and cuts the -de 81 at 84; but RC connects at the same time RR to positive 85 and RR restores on 82 the - of 81. On the other hand
RR puts RC on hook by connecting it to positive
86.



   As the two relays RC and RR do not operate instantaneously and simultaneously there is between the two polarity settings - on 82 a current interruption which will be too short to operate. - the relays at slow speed and! but will make the others work.



   When the operator leaves the button
BL return to its initial position shown in FIG. 13, the positive 83 short-circuits RR which returns to rest and stops the hooking of RC which returns in turn to rest by putting lo - 81 on 82 by 84.

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 shown in Figures 8,9, and 10; the operation of the relays of FIG. 8 being rather complicated, it should be explained, with certain details.



   The relays a and b are controlled by each other and work together as soon as a polarity is connected to 25, using the above-noted chread notation: C comes to work if bt, dr and and hangs if br, and returns to idle if ft and bt d comes to work if br and ct (i.e. if c is hangs if bt andd-t e comes to work if bt s' hangs unhooks if broke because it is over-circuited during "during
However, it is slow in operation and / forming a number, the very short power interruptions which occur leave it in the latched position.

   f comes to work if d-t and b-r hangs out if e-r or b-r before it gets then shorted g comes to work for e-t, h-r and f-t hangs on for f-r goes off for f-t and h-t
It is easy to check on the figure it the indications of this table which summarizes the operation of these relays.

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   It can therefore be seen that chanue movement of BL, depression or return in place will have the effect of flying 82 for a very short time.



   To place the subscriber locally, the operator presses the BL button and after a short time allows it to come back in place, there are thus two successive interruptions of current separated by an interval long enough for the operation of the slow relays e and f .



   As soon as the operator inserted the plug into the jack, the - of 81 was connected to wire 76 by 82 and, thanks to the short-circuiting produced by the relay K2 (fig. 7) (came to work when the calling subscriber picked up his device) to 25 and consequently to relay a of fig. 8. This relay will therefore normally be on and will hold off at each power interruption produced at the manual control panel.



   It then becomes relatively easy by referring to the summary of operation given above and to Figures 8,8 and 10 to follow what will happen. At the beginning, as it was said., A, b and c, e have / came to work, at the first interruption, a and b will return to rest, as the interruption is short, e will remain at work and one will have by suites
 EMI19.1
 a 'y - r b-r c-t held on hooking d-t f-t hanging on g-t
The relay coming to work connects the positive 86 to the 87 wire ot from there to 1 (fig. 10), then through 89 to the

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 ide relay the pin 10 which comes to work ot hooked by 90, wire 91, 3 of fig.

   VIII, 3 of fig IX, pallet 92 of relay S1 actublle- ment at rest, wire 93., paddle do S2 'wire 94, paddle do S; wire '95., '6 of fig. VIII, wire 96 and positive 97-by the pallet of the relay at work.



   The interruption of current having ceased., A and '' '' return to work, o unhooks and comes to rest ¯, f unhooks (a louse later because of its slow operation) which produces the catch do g .



   On the other hand, given the arrangement that we took / los râlais c'ost-à-diro: a-t., Bt, or, fr, gt, the pole -98 so is connected on the one hand to 4 (fig. 10) and on the other hand at one end of the winding of h which gets excited, flies to work and clings. By 4, the 98 is connected to 8 (fig. 9) by the wires 99 the pallet do 1 at work., 'And the wire 101; do there, this polarity is connected to the end of onroulomont do Sq which is oxidized and hooked by 102.7 (fig.

   VIII),
3 pallet do h at work ot -10 Operation or relay Si has elsewhere / for dffot do break the hooko do i,
When the telephonist releases the button BL olle produces a new interruption of the current, an interruption which has the effect of doing mottro of the various relays in the following position: ar br, ot (because of its outline), ct (but- tonu hooked up ) dt ft and gr.

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 d we return to the working position again connocto the .positive 86 with the rolai i, which is maintained at the gluing by 90,91, 3 (fig. VIII), .pâlotte 104 do h au.travail Qt positive 75.



     L ': current intorruption having broken, the rolais .f returns to rest after a certain time; the -98 will find it connected every time to relay H2 (fig. 7), which offectuors setting on local do 1, 'subscriber.



   The relay is activated by the following way: - 98, palotto 105do f-r, pallet 10 do g-r, 5 (fig. X), wire 106, palotto 107 do i-t, 11 fig. 9, thread 108 ,, palotto 109 do s1-t, .11 (fig. 6) thread 111, rolais H2. Lo râlais' hangs by stud 112, wire 113, 21 freezes 8, wire 113, ot -114 by the palotte of the relay o to work.



   Pou after lo, turn au.r3pos do f, relay h comes to rest because it is bypassed by -115, pallet 117 of g, palotto 118 do h. The relay d also comes to rest, and c returns to work; so on / re thus in the primitive conditions, glues which exist before the telephonist has pressed. on the button BL.



   .Pondant co time relay H2 came to work actuated rolais A do the subscriber appolant by -119 (connected by l @ relay k2), wire 121, palotto 122 of H2 wires 123,124,125 (fig.6) palotto 126 do C2 we work, wire 127 and relay A; this simpleton hangs by thread 128, palottos 129, 131 ot 132 back rolais E, F, G ot 133.



   The relay A then connects the wires from line 54 to wires 134 of local communications to which

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 EMI22.1
 the tel-ephonisto found it dllo-meme connected 'by the igno LO2' lo translatour., the f, they 135,135 '
 EMI22.2
 ot 10 rolais, H2 at work.



  -3 / Call from Subscriber -n'O '23 by the operator.



  The operator will dial the requested number
 EMI22.3
 au'moyen a device quoldon4uc., 'by oxomplo a dial d? appol-, including 10 rôlo sora d) i'ntcr1:' ôtnp1 "o; â uno çadonco determined, the continuity of the d, r'ô11it ranging from do 81 (flig; 13) au'r .-) lais a (fig. VIII); ot cola a nombro do times oorrosponding to the number formed.

   By ùxemp1a 'to call subscriber 23; the maneuver of the call disc will have 'for offot to produce soft very short interruptions separated' by a reestablishment of the current of an oortàino detorminéo duration depending on the vito'sso of rotation of the appol box, cola will form the number 2 back
 EMI22.4
 dizainos;

   unszüo i'1. A longer time will elapse, during which the current is put on a ot during which the telephone operator will bring the disc to position, so that it is released and letting it return to its rest position, it produces three interruptions curves -separated by gentle reestablished'30- 'current mounts of the detorminéo duration.



   The first interruption produces exactly the effects which have been described above in connection with
 EMI22.5
 do. setting in iocai.do. the calling subscriber, that is to say that at the end of the interruption we will find ourselves in the following situation (fig. 8).
 EMI22.6
 a-.r ,, t-r, d-t on hooking, d-t-s' f-t hanging on, ë-t, do more (f3g. 9 ot 10) i-t S'aôcroch6.

 <Desc / Clms Page number 23>

 Let us remember that because of their function they will be hooked on the relays where they are in the working position, while the duration of the formation of the numeral of the dizainos, and which they will also remain hung, while the formation of the anitites number is being formed.



   During the first delivery of current we have: a-t, b-t, c-r, d-t, o-t, f-t.



   During the second current intorruption we have: 'a-r, b-r ,, o-r, d-r.



   Coming to the ropos d rolio lo + 86 to 2 (fig.X) through the palotto do cr, the current passes through wire 136, the palotto do i., And actuate the relay j, this rolai coupo the hooking do i which roviont to the ropos.



  We see here that the second intorruption by activating the rolais ja produced an effect different from the co which had or liou during the local miso on, where the relay i was hooked, cola tiont at co quo the reestablishment of the current separating the soft interruptions were shorter than during the local miso on ot did not pormis to functionomont lont f do return to r) pos.



   The current being reestablished, losers a and b return to work, but this time the reestablishment of the current will be relatively long in the order of colui which separated the two interruptions during the local setting; it is necessary to offot that the telephonisto introduces the finger in the suitable hole of the dial, ot turn this one; cotto duréo of establishment do current ost sufficient for that f returns to the ropos.

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  98
 EMI24.1
 So, s' 10 - / oet connected by fr- ot gt on the one hand to the bnroulemont do h which 'comes to work ot daccrocho, - ot on the other hand to 4' (fig .. 10), then by 99,137 ot, j.-ty "relay at 9 '(fi'g .. 9)',. wire 1'38 ,. relay S ,, which 'fÛl1oti'onno ot. is hooked in the m3mo way ,. the relay If 1: 'had made' during the local bet '.



  If 10 numeral dos dizaihoc had been "un-5'au liou of a 2 ,, los three intorruptibns serving 'to form it would have put on sorvico the relay K'au liou
 EMI24.2
 of the relay j and by Buito'J by ': 20, lo rolais S (freeze, 9) to the liou of the rolais 82 "When the t6léphonistorolacho oon di8quo pour, form. 10 digit dos units, .o'bGt-à-diro three ,.



  1QS preoeducational operations described? J roprodui-- ront ,, 10s three pr.mi, éxo3,, r: la, is i j k of fig. 107,, will function without 3uocossivomont ot we will finally have S2 and K. At work ..



   When this operation is done the established ..: .- current sum lasts a long time. Relay f returns to idle ot the -... do 98 then found
 EMI24.3
 connected 'à'uno extréniité' of the winding of rolais C2 of the subscriber called 'by .105' (fl-r),; 106 (g-r),.



  5 (fig. 10) .fil'1CB, pa1 ^ tto do K-t,; 15 (fliÉ: .9) ,; thread 141, palotto de si-tj., Jt 23 (: ig..6),. thread 14f:. do C2-r palette,
The second end 'of relay C2 of the called subscriber (first subscriber in fig. 6)' is found
 EMI24.4
 connected to the positive polo by wire 140 (: Cig., 6, .7, ot 5) ot 24 (fig..VIII) then flicker of the relay b-t,. wire 143, .pal - .; to of relay h-t .; .wire 144, .wire 74, '. palotte do f-r. and positive 75:.

 <Desc / Clms Page number 25>

 



   This circuit is cut off afterwards by the slow-functioning relay h which returns to the switch one louse after f because it sc found short-circuited by 117 and 115.



   C2 do the ahonné 23 then hooked up by 72, relay J2 '23 (fig. 8) palotto do o-t ot positive 97; so he stays at work.



   The telephoni3to then operates its call key ot thus activates the ringtone of the subscriber under control N 25, where it picks up and the rolais K2 so found itself again, doing it as it was said above for the subscriber appending rolais A to subscriber 23 appended via non-rolais C2 at work, the two subscribers can then talk to.



   The telephonist who is on earphone then rotates her jack plug and co-liberator makes all the organos of the rural contral considered, at the oxooption of the relays A soft back subscribers' on communication.



   We have seen previously that the relay A of the calling subscriber, - and consequently also that of the called subscriber, was maintained on hooking up by a current passing through the pallets of the relays E, F, G (fig. 7) )
When a subscriber unhooked his apparoil he established a metallic conmocion on the soft wires of the premises, the relay F came to work substituting the -145 for the -133 to maintain the hooking up to the relays A.



   When the two subscribers hang up, relay F returns to idle and rjlais A leave the hook-up and also come to ropos ..

 <Desc / Clms Page number 26>

 



   If during the conversation the telephone operator wants to listen, all she has to do is translate the file in the jaok and redial the number 11, which she used to activate relay H and to put in contact with the 'calling subscriber
If it deems it necessary to interrupt communication between the subscribed Games, it can activate relay E (fig. 7) by dialing a corresponding number, number 12 for example, which activates this relay as number 11 activates. the H.

   The relays A of the two subscribers then come to rest and, by removing her plug, the telephone operator restores all the organs of the rural center to the original rest position.
If during a local conversation such as the one just envisaged, the operator must give one of the two subscribers, N 23 for example, a call having priority over local calls, she dials number 23, which has, as we have seen, the effect of connecting this subscriber to the secondary of the transla- tor of the omnibus line used by the telephone operator, the latter then perceives the communication in progress, it forms then the number 12 to cut it and is in the presence of the only subscriber 23,

   the previous correspondent being isolated and '' can no longer hear anything.



   Let us now examine what happens when the manual exchange is called by a subscriber of a rural exchange (OR 2) connected to it through the rural exchange OR ,.

 <Desc / Clms Page number 27>

 



   Cn will suppose that CR2 is connected to CR1 by the line LO14 'to which correspond on the lines LO1' LO2 'etc ... the relays M1N1 ,. : 12N2 etc .. '. which will play in relation to LO14 the role that the relays C1 C2 C3 etc.,.,. played vis-à-vis subscribers of the CR1 exchange
The central CR2 is arranged as CR1 'therefore by activating its magneto the subscriber of CR2 connects to the line LO14 which causes, in this.

   central CR2 'the excitation read relay L relating to. LO14 and therefore the connection of the pole - and of wire 151 which here plays the role played by wire 76 when the manual exchange is called by a subscriber of CR1 '
As soon as this connection is made, the relay V is energized by -151, wire 152, pallet of T (at rest) wire 153, pallet of Rr, wire 154, pallet 155, winding of V, 158, pallet 157 of -il at rest ., wire 158 (fig. 4 and 5) passing through the paddles and rest pads of M2 and 1.13, wire 159, (fig. 5 and 7, winding of relay B and positive pole. Relay V s' hangs besides as we see on the freeze 4.



   Relay B (fig. '7) is therefore actuated as before, it activates the calling line finder (fig. II) and t fl ini- ly, when relay Y corresponding to line LO14 (considered as a subscriber of the office CR1) worked, connects the polo - to wires 161, 162,163 leading to pallets of relay V1 which play the previously described role of pallets corresponding to 59,60 and 61 of relay D.

 <Desc / Clms Page number 28>

 
 EMI28.1
 



  Let us suppose that the line ofm: 11bus' LOI is free, the pole of 163 Vélo 8tre connected by 1-64 'to' the loop ... len1ent of relay N, thence by 165 and the pallet of M1 to rest at 24 and finally at a positive pole through the
 EMI28.2
 intermediary of the connections detailed above when we explained the operation of relays C1 C2 etc ...



   The relay N1 coming to work is connected to the positive 167 through the relay 1., It which then comes to work and in doing so returns the positive pole 66 on the line 402 as explained above.
 EMI28.3
 àcmment and the circuit L (? 1 so finds it busy.



  'The pole - of the wire 151 is then connected pzr Nl-t a, vcc the wire l8 of LO- which produces, as it 3. has been said préeédc-rmcint, l ": J.llum'J.go de la, manual call lamp.



   It should be noted that the NI relay produced
 EMI28.4
 a continuous metallic connection between the sets of wires of 1014 and the two wires of D3. The telephone operator is therefore directly in contact with the central OR 2
As soon as the operator;

   put its plug in the jack, lc polo - from the central is connected to the line
 EMI28.5
 169 of LOI and consequently on line 171 of IA1, colT. P actuates the P relay through the r2 wire, this P relay connects the E, -l'r3 through 1'74 to the S relay which comes to p <F ?. work and and making connect - the 76 to the relay T which also comes in the working position 'This has the effect of maintaining Ni at the gluing in another way by 178, 1'7'7, pallet of St, 178, and - 179; as a result N1 will stay hooked even if the - of the thread 164 is removed.

 <Desc / Clms Page number 29>

 
 EMI29.1
 



  The telephone operator retains her key '1'1.ppOl next to the receiver to whom she answers thus picks up her pp'J .. rcj.1. Cola, '1 for effect, as explained earlier, to turn off the, limpc of supe.rvisioJ ::) ..- 11. telephone operator provided' 1 as the subscriber is online can 'lb'1iss his key listening, he dm, ndcr the number that he'siro and establish..h'oommunic'1tiono When cotto, coünÎ9'1ti-one has been established, the telephone operator withdraws his card from the J'10k, the cliis No more current from the manual control comes from them, it bypasses S by - the 73, 179, pallet of S.



  Slow running cc rohis S comes ilors gtl repos iveo a oe.rt'1in rct'1rd and in turn conmt-cireuitc 1 by - 180, thread 181, p'110tte de S-r, thread
 EMI29.2
 182. Lc relay T off, also operating.
 EMI29.3
 slow, takes a short time to return to the rcpos. This time is sufficient for the relays h41 and Ni to be released for the rest of S which cuts the circuit t the 7'7, 178 ct -179 '1V'1nt quo T n''1it reconnected lc - 180 to, 1- ". to establish a Communicition, the telephonist may have to call a subscriber, for example 1 <2b, connected to ccntr, lOZ2 .; suppose to fix the ideas, pgfp xp N =, re; à! t-é7% µ = 5EfifP% Z that 1'1 line connects lc $ ontr'11 CR2 iu central OR carries 1ns os, last number 15;

   li telephonist commc-noeri by dialing 'wee his 1ppol dial the number 1-5 had which iuri for effect of. oonn90tr uco the tronodin de lignoa omnibus connect OR .. to OR; 29 A cc. moment the sepio.tcup of OR, come iu repcs and the maneuvers of 13. telephonist will immediately activate the aépcotc, ur of CR2 of the f'11t ", Qe the ix3itxtion of the rciiis N, of j.3. line 141, she compoi3cri ilcrs the number 25 of the called child and thus mcttri3 in relation '), v 00 him.

 <Desc / Clms Page number 30>

 
 EMI30.1
 



  A third case to consider is one where 1J'J.
 EMI30.2
 operator must establish communication between
 EMI30.3
 an OR subscriber and an OR2 subscriber. Your ecli it connects to the local circuit of CRi d-1-iberd the subscriber connected to this ccntr, l, and that of li f, # On
 EMI30.4
 which is described previously, it then connects.
 EMI30.5
 at the same local circuit, the subscriber of OR2 by the operations s'lÍv '). ntes:
 EMI30.6
 We assume '). that the lines used are
 EMI30.7
 LOI and 1.014 'When 11-given from OR2, called by 1'1 telephonist picks up his device, he activates the rcl, is 1 <: 3 do his oc-ntril and pir following a short cireuità the COn1 (mS'3.tor 79 of the trins-
 EMI30.8
 director.
 EMI30.9
 



  The - of the manual 1 is found from oc flit connected :: J, V0C wire 151 and therefore '1 activates the relay
 EMI30.10
 
 EMI30.11
 'Ù by 1, palctte of T' lu tr'1.V - :, il and thread 185; when coming, u work U activates the roliis 0 of the, next flxçon1.nta: 0 sc found connected iu -186 near H1) by this relay H1 which has already come 'to the tr1.v'J.it "then even the threads 18'7, lqt3, pallet fi of R '1U rcpos, thread 191, pallet of U iu tr'1v'1.il,
 EMI30.12
 wire 192 and relay 0.

   As soon as it came cn posi-
 EMI30.13
 tion of tr'1.v: 1il, 0 s'iocrocho by wire-195 which is continued by wire 1 128 until 1: 1 pallet of relay E, cc last rcl: l.Ís '' 1in8i that the
 EMI30.14
 following relays F and 9 will be used for cuts,
 EMI30.15
 o-ommc this 6. has been explained previously. L3 setting n.tr'1v'1i1 of rcliis 0 ontr'1io that of relay Q which sc; finds connected 3u po the positive ee: 194.

 <Desc / Clms Page number 31>

 
 EMI31.1
 



  Lc rellis 0 also isolates the negative pole at 79, cc which has the effect of ri1ma; ner at rest the rcl1.ic u and Ni. Coming 1.U rest Ni cuts the circuit I P which in turn vicnt u rest in y 1.IDen1.nt also, as this 1. been explained; the relays S ct T. 'Finally the -reir-ls 0 on vcnant tau tr1.v1.it also leads there the rel1.ie R which it connects to the
 EMI31.2
 - 179.
 EMI31.3
 



  The situation of r-1-tis is -tiers li as follows: 0-t, Q-t, Ret, U-t, P-r, S-r, T-r.



  When it is a, u rest lc rclxis R conncetc by lc sled wire, 7 lc rcl1.is Ni 1.U number 14 connected '1U na 14 .iu rclmir S (fig. 9) of the selector cor- to L01; it likewise connects relays N2 and N3 to ** answering /> lines L02 ot L03. This conne !! t: your '1our effect of making these relts work. As we have already seen, vig.



  In the position currently considered, "the rel1.iS R is at tr'1v1.il and connects 14 of relay Sl (selector, .le la, line Law) to Hl by wire 1 ±, 6, pallet of Q lu tr, viil, fil 197, pallet of Hl '1U rest and winding' the gl which vicnt at work and allows, as explained above, for him the telephone operator to listen to the convers1.tion
 EMI31.4
 in progress.
 EMI31.5
 



  The establishment of a communication between a member of a rural center CR1 and a third born of a rural center forming part of an iutrc sector (for example, the rural center CR1 ) désscrvi By the ccntr "1l m1.nuc.l: lA Does not offer any difficulty,

 <Desc / Clms Page number 32>

 
 EMI32.1
 ii litisondec kux ligner. omnibus.reliés rcspcoti -'- '-vcmcht to the soft ## ghTz rural centriux cnvãigé? (omnibus lines on which we connect the sweet subscribers) sc rxis3nt m cc, ntr.l m-muel to 11-tilc of a diycordc h1.bi kills 1.



  As one 1''1. considering the preimbulc of the description, we can foresee the cmbroch, gc of an aibéne on a: omnibus line, Ih, nt du oen tr1.1 m'3.nuc1 vcrc lo first oontr.1 ràrai (fig.12) For 1.ppC 1st the ccntrxl rurrl è, starting with the plugged-in c1.bmnc, we first make sure that the voyiiqt- 3'occupy, tion z .cet -you rcpon, then we 10 yours 1> migneto. Aur; Çitôt, l '::, nnonoi'1.tc-ur .the e.ccours AS triggers a shutter Tu ccntrii manuel' To answer, 11. telephone operator plugs in the circuit- corres: ponl'1.nt, .press on the call button to send the court, nt @ l'-ippc-1 from one side, on one of the line wires and, on the other side, to 11. earth 'Lc current runs , therefore, 11-nnoneî-itcur ^ I'-ippc-1; lA of 1'1 car plugged in and triggers the shutter of said innonciitcur which connects the receiver of 1, OT.ëhe on 1% omnibus line iiiint to ocntr1 .l minual.

   Communication is then established. It should be noted that some of the omnibus line lc..nfioh1.ge; lic rallies 2 :. ct b du ccntril ruril (located imr; É, 1i'J.terncnt near 11, o, binc plugged in) came into action (the 1-1 minerc explained plus h1.ut) to put the occupation ( iu said contr, l), the omnibus line 3111nt to the c (, ntril m1.nucl, 1e so that pciylint all 1, duration of a converrntion between, the centra.l m1.nucl and li c'J.bino plugged in , 4.1

 <Desc / Clms Page number 33>

 
 EMI33.1
 corrcapon3 bus line, nt to this booth nc can psctrc. taken by any of the others
 EMI33.2
 rural exchanges.
 EMI33.3
 



  The: mnonci1.teur. : the 1. call AA this org.ni8é the teÍ'm.nièr0 that its volct does. can fall only when this inncnciiteur is traversed by the short 1'1.ppel (current 1.lt rn-ttif) and that said 'shutter sc raises 1.utom1.tically during the r1.coroch'1gc read telephone handset.



  The busy indicator light is provided with 3'un rest cont1.et Cr whose function is to cut the magneto 3'zppcl ic the attached cabin pcni.nt the occup1.tion ic 13. line pir a rural ccntril set to 1. after.



  Li mgnéto i'1.Pl; el also carries a contact of rcpor. Ci, 1, cQup1.nt l'nnonci, call tcur AA ponJ1..nt the emio8ion of the inrush current l-moé, the 1'1 car eclached to the ccntrii J: 11.nual. To complete the new in iiirpofitir, we have planned a 1.ppé.l, the organized recourse, nized 'the canvas m1.nièrL that when any of the rural ccntriux is derinacrcnt, cc centnl can still call manual ccntr1.1 or be ippcied by it. Danx cc cir, calls from rural clntr1.l are pign'11ed 1.U ccntrii m'1nuel by P1.nr::onci 1. teur lc ccccurs AS ct 1st calls from manual ocntrii pl.rvienr :: cnt, read this ..ntrl.l, rur1.l, at a door zpéciii PS reads "1,, oi, tc de accours" Cc, last this brwohé en l6rivl.tion rur lcc two son, Il. li, gnc and t ec found isolated during 3u fpnc- tionnen.ent 1st relay K ct L.

   It follows that

 <Desc / Clms Page number 34>

 
 EMI34.1
 Every time. This two hundred relays has the impoe- si bi 1i ty of. fouc'tionncr (either due to 3u l11'1.uv'1io state der. bittcrics, due to non fontibn-
 EMI34.2
 
 EMI34.3
 ncmont dec different org'J.ne8 ic cocmndo) 11-ippe-Ip lwaé p'1.r li. telephonist (iprèo l'1.ccompliDf. :: cmont maneuvers h1.-bi tuellE: .s) arrives Urcctcmcnt; u station dc. running. In this way, .the rural settlements. are pr1.tiqucmcnt Jimais priTfê's from '
 EMI34.4
 phono phone.
 EMI34.5
 



  Finally, the new automatic telephone system is organized to allow li roch1.rgo to difJ'hncc 108 b1.ttcrioo d'1.ccumuhteurEJ 10 chiquo central rurii 1.utom1.tiquv ius the genertcurs arranged at cent! '' 1.1 manual. For this tffctt on -1 provided '1U, manual control1.1 a button u which allows to insert'3.1cr, on the line wire (\ ±) rreC1pon "hnt at the tip of Li plugs a voltmeter to measure' 1U ccntril mnuel, at the time of the Ülu'n1.gc of 1 ').

   Call impo, '1. tension dc 1-1 b'1ttcrie 1 * ocntrii rur1.1 on which the subscriber iemndcur depends. i this tcncion ost deemed insuffinntc, 1. telephonist pout, '1p: Eès .voir -donné 11. communiet- tien who this -lel! 1'3.n'lée, mcttro on ch1.rgc h h1.ttcric "lu ccntr1.1 rural conr1,16-rée-, coci on COJ7Jpo8: mt, 1 '; edge the n 1 ?, number assigned here to 11, ch1.rgG'doG batteries; 11. cOJ7Jpopition: the cc number 1.for purpose to remove the excitation of the relay v, this comes to tr1.v1.:bl and connects r p1.r 201 and 202 lc rl 'hi !? /1.U wire 169 connected to ccn- tr> 1 minuci '1Vi..C a pole -} 11. ncoonir- end .i. the encircle lu r1-iis x & 3t connected to the negative pole .the 1z b, tteric lu cGntr1.1 considered rural;

   

 <Desc / Clms Page number 35>

 
 EMI35.1
 when it comes in. position Ic triviii it connects U-reotenent, u wire 169 by 203 and 201 ct CD1.tti- rift,;: 1. r: (coJj! jtc, l.rm1.turc ccurt-circuitc the rehis V -., which returns to rest.



  In rcmplç1.nt lv file which 1 ccrvi to the number- rod pvr, unc ficp., - sipéciiiu for 11. rcchirgc to 1i8- t1.n, cc ", '11. Telephcnictc. Sends, lu ccntn.1 mwucl, to, tr.T.'vcr the wire I iignc, the neocscary courmt to 11. chvrgc. of the battery read ccntr1.l rur1 "l.



  L1. npéciiic file 3c rccti-trgc 1. une forc tc, 1 lc. that, at the time of introduction .lin ;: lc -àfe e3ak, coul le cent: 1, ct, de nape left its cçmt1.and li rest, the contact ic 1'1 painted rcctint, linins sa, peGiti.on , norIr.'1.le. It results 'the this' 1iepoeition quc, mI! LC peI1j1.nt ii ch1.rg0 to Hf.1tJ, nce 'the 11. b3ttc- ri <W c: ntr-il I1.lr1.1, the' 1ppele vcm. nt dcs different ocntr, stepped rural ows, on a led ii.gnL omnibqr are ci, gp'1lés' 1U cent!; '1.1 n.nuc p'1r' ..

   J 1 le relï, iri t, For re-I) c.n.Irc ,, il 1 nuff i que ia té l-
 EMI35.2
 
 EMI35.3
 phoniE: tc withdrew 11. fi.che "1; load, let it 1'1. re-fill. worse a file Ic, cOllvr, rn tion ct qq'c li.s epèr, this donkey is 1'1. téja in -tique, plus 'h1.u t', There is T. li, 0U: the rçr2-.trqucr that which which narrates, lc number of staggered exchanges Dur unc mône omnibus line (or 1.ur pluc, icuro omnibus lines , and whatever the geometrical figure represented by the reoc? u formed by the ennenblc ic, rural ccntriux, the organs all h ocntr-tuy and their functioning are i 1cntiq Ul.f '.



  Lcr related omnibus lines ¯boutiss # nt.1 "u G0ntrhl wnucl can be multiplied rising

 <Desc / Clms Page number 36>

 several operator positions, which operators have the ability to operate the network simultaneously, thanks to an occupancy device that includes each bus line in each of the rural exchanges.



   This occupation scheme is organized for. send the operator of the manual exchange a sound signal each time this operator dials in a rural exchange, the number of the bus line going to the next rural exchange while said bus line is already occupied by another operator from the manual exchange via another bus line from the manual exchange;
The new automatic relay telephone system can have any number of automatic rural exchanges spread over any number of bus lines and rural exchanges can have any number of subscribers.



   It is obvious that the example described above and illustrated by the drawing is provided only as an indication and not limiting and that the automatic telephone system with relay, which is the subject of the present invention, can be subjected to all modifications of details without departing from the spirit of the invention.
 EMI36.1
 



  RCiTCIiDT2, ± TI # "52" Having thus described my invention and reserving the right to make any improvements or modifications that may be necessary to me, 3rd claims as my exclusive and private property. "


    

Claims (1)

CLAIMS 1 - An automatic telephone system for a network comprising a manual main exchange and several automatic rural exchanges serving subscribers, each rural exchange being connected by one or more intercom lines to the manual exchange either directly or through 'one or more rural exchanges closer than him to the manual exchange, characterized by the fact that the maneuvers necessary for establishing a communication are all carried out by the operator of the manual exchange, the only operations carried out by the subscriber being first of all to activate his magneto and secondly to pick up his handset only when called back by the operator of the manual exchange; the maneuvers made in the rural exchanges being carried out only by means of fast and slow functioning relays. 2 - Automatic telephone system according to 1, comprising rural exchanges each characterized by the fact that each line going directly or not to the manual exchange is assigned an individual selector allowing it to be connected to a telephone line. 'subscriber or a line going to a more distant exchange - 2 / relays (M, N, J) keeping the line when it is busy :; that the exchange is equipped with a single call line finder connecting the calling line with a line going to the manual exchange as soon as one of its lines is available, that each subscriber line is provided with relays allowing connection connect to a line going <Desc / Clms Page number 38> to the manual exchange or to a local line for communications' with a subscriber-, either from the same exchange 'or from a / more distant exchange served by it'; that relays allow the central manual to listen to an established call and cut it if necessary; that back-up devices make it possible to communicate directly from the rural center with the manual, in case the rural is in trouble; finally, that the rural exchange has a central battery, special devices allowing the voltage of this battery to be checked and recharged from the manual exchange. 3 - A manual exchange for the following telephone system 1 and 2, comprising jacks connected to the lines going to the rural exchanges, a call lamp on each jack, cords with two plugs, for each cord of the supervision lamps; call and listening keys .; characterized by the fact that it comprises for each cord a device such as a dial for dialing a number by making it possible to send on the line to which the plug is connected electric pulses separated by periods of short-term isolation. - 4 - A manual switchboard according to 3, characterized in that the device actuated by the dial and allowing brief interruptions of current is constituted by two relays actuated one by the other, so as to operate successively: the first cutting the circuit and the second restoring it so that the current interruptions correspond to the interval between the operation of the relays. <Desc / Clms Page number 39> 5 - Rural exchanges following 1 and 2, each characterized by the fact that the lines leaving from this rural exchange and heading towards the manual exchange each include groups of MN relays, each group corresponding to a line going from the considered exchange. to other more distant rural exchanges, and serving to establish connections with the latter lines and to guard the former; and that they also each include a relay J used for connections with the local line and for guarding the line in question, a relay K operating when the subscriber picks up his device and bypassing the translator capacitor and a relay L switching on the manual control panel call lamp. 6 - Rural exchanges according to 1 and 2, each characterized by the fact that each line going to the manual exchange is assigned an individual selector made up of fast-functioning relays and slow-functioning relays, actuated by the items. of current and interruptions produced by the central unit, the slowly operating relays remaining in the working position during the rapid successions of emission and short interruptions produced by the movement of the dial returning automatically ,. with an angular speed determined at its initial position after having been moved away from it, these slow relays can only change position during the longer intervals which elapse, for example between the formation of two consecutive digits. <Desc / Clms Page number 40> 7 - Rural exchanges according to 1 and 2 each characterized by the fact that it has a call line distributor which operates after a call coming either from a subscriber. ,, or from a rural exchange more distant has arrived at this exchange, and as soon as a line going to the manual exchange is free, this distributor will then send on the calling line the current which will operate the special relays to this line, which have the role of the connect to the free line going to the manual exchange. 8 - A distributor of following call lines 7 ,. characterized by the fact that it has as many connection relays Y as there are at the subscriber exchange and lines coming from more distant exchanges) and two relays Z1 and Z2 controlling each other., so as to achieve the four combinations corresponding to: one relay at rest, the other at work, the two relays at rest, the two relays at work, these combinations succeeding each other indefinitely in the same order; the battery being connected to an odd-numbered Y relay ,. when the two relays are in the working position and to the Y relays of even rank, if they are both in the rest position. 9 - A central following 1 and 2, characterized by the fact that each subscriber line. Includes a relay D actuated by the magneto and activates @@ t in the working position. and as many relays C as there are lines going to the manual exchange; - the <Desc / Clms Page number 41> relay D activating the call line distributor when it is at work as soon as a line leading to the manual is available, the relay C relating to this line then receiving current from the calling line distributor and switching the subscriber in communication with the line going to the manual via the translator and by activating the call relay L, 10 - A rural exchange following 1 and 2, characterized by the fact that the relays J, M, N relating to each line going to the manual are arranged to send back, as soon as this line is busy, a positive pole on the next free line, the presence of this pole on a line being necessary for the operation of the relays C corresponding to this same line, so that, if several lines are available, a subscriber calling can only be connected to one of them, the one to which the positive pole has been returned. 11 - A rural exchange according to 1 and 2, characterized by the fact that the connection of a subscriber with the local line is made by dialing in the manual a determined number which, by means of the individual selector of the line used, activate a relay H relating to this line, which in turn activates a relay A relating to the subscriber, which connects it to the local line and clings to the working position, 12 .-. A rural exchange according to 1, 2 and 11, characterized by the fact that by forming a certain determined number, the operator of the manual exchange activates a special relay which cuts off the hooking up of relay A and therefore isolates the corresponding subscriber from the local line <Desc / Clms Page number 42> 13'- A rural exchange following 1 and 2-, charac- terized by the fact that each line coming from a more distant rural exchange is assigned a relay V which ... operates during the call in the same way as the manual exchange relay controlling the call lamp., this V relay acting) in relation to the line connecting the two rural exchanges, the role that relay D plays in relation to a subscriber line and connecting the line connecting the two rural exchanges to a line going towards the manual via relays M and N corresponding to these two lines , the relays' M and N playing the same role as the relays C played for setting up a subscriber's communication. 14 In a telephone system according to 1 and 2, a booth plugged into a line connecting a rural exchange to the manual exchange; characterized by the fact that it comprises an indicator showing, if the line is free, a magneto mounted between the two line wires and actuating; in the manual-, a special annunciator, the annunciator cutting off the circuit of the magneto if the line is busy and the magneto cutting off the annunciator while operating. 15 @ A rural center following 1 and 2; charac- terized by the fact that a first aid station is mounted between the two wires of a line leading to the manual exchange; this station activating the same annunciator as the car or a similar annunciator, and being isolated by relays K and L-, so as to be usable only if these relays do not operate following a fault. <Desc / Clms Page number 43> 16 - A telephone system according to 1 and 2, characterized by the fact that, when a # call lamp is switched on, the operator of the mamuel entry can connect the line coming from the rural exchange to a voltmeter to check the voltage of the battery of said rural exchange, and by inserting a special plug into the jack it can connect to the rural battery through relays v and x, and recharge the latter without interrupting the service. SUMMARY ----------- l- An automatic telephone system for a network comprising a manual main exchange and several automatic rural exchanges serving subscribers, each rural central being connected by one or more telephone lines. inter- communication to the manual exchange either directly or via one or more rural exchanges closer than it to the manual central office, characterized by the fact that the maneuvers necessary for establishing a communication are all performed by the operator of the manual exchange, the only operations performed by the subscriber being first to activate his magneto and secondly to pick up his handset when he is called back by Empress of the manual exchange; all the maneuvers made in the rural exchanges being carried out only by means of fast and slow functioning relays.