BE409407A - - Google Patents

Description

       

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  Improvements to telephone systems.



  International Convention: US patent application No. 726,501 filed on May 19, 1934 by Nor ,,,, man Herbert Saunders, of which the plaintiff is the beneficiary.

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   The present invention relates to telephony systems or to identical systems and relates more particularly, but not exclusively, to small automatic telephony systems intended for installations in towns or villages. An automatic telephone system of this type is generally known as a communal automatic office or rural automatic office and may have a capacity of fifty lines, more or less. Usually, the lines are grouped-station lines having their ringing circuit either bridged or grounded, with subscribers calling by ringing code. Provision has also been made for the possibility of making and receiving long distance calls.



   The object of the present invention is to provide a new and improved communal automatic office of the relay type which has the characteristics mentioned above.



   One of the characteristics of the invention relates to new arrangements of the trunk circuits used for the interconnection of the lines of the system.



   Another characteristic of the invention relates to an improved device for repeating pulses.



   Another characteristic of the invention relates to circuits provided for selecting and connecting various ringing codes to the subscriber lines for calling a subscriber determined by the transmission of the call number and the code selection digits.



   Another feature relates to the new start and transfer circuit for the allocation of the various junction circuits, for the transfer of a call from one line to another in the event that the relays

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 of the finder of the first trunk circuit cannot find the calling line, and to prevent seizure by a trunk circuit which becomes free of a call allocated to another trunk circuit.



   These features and a few others will be made evident by the following detailed description of the invention.



   In the appended plans comprising FIGS. 1 to 6 inclusive, by means of the usual symbols, a relay junction circuit and various line and substation circuits have been represented which will make it possible to describe and understand the invention.



   Fig. 1 represents a line with grouped stations, in the current case line 17 and the line circuit which is associated with it. Line wires 14 and 15 and incoming test wire 16 from that line, marked with a brace, extend to the junction circuit connector in fig. 4 where they connect to wires with the same numbers. The rest of fig. 1 shows the searcher side of the junction circuit comprising FGR group searcher relays and FUR unit searcher relays. Each group of lines such as group - 10 has two group finder relays, such as relay 110 which connects only line wires of group - 10 to the junction circuit and relay 111 which connects only test leads. from group - 10 to junction circuit.

   In the present case, it has been assumed that there are eight groups of lines, each comprising seven lines. In order to simplify the plans only three groups of lines have been shown, they are the group - 10, the group - 20, and the group - 80. Each of the lines is connected to a line circuit in the same way as the one. shown for line 17. The relays

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 Unit researchers FUR correspond in number to the number of lines in each group, in this case, since there are seven lines in each group there will be seven relay unit researchers. Only three of them have been shown in order to simplify the plans.



   Figs. 2 and 3 represent the junction circuit control relays.



   Fig. 4 shows the connector side of the junction circuit and two line circuits. As on the researcher side there are two relays on the connector side for each group of lines. Group 410 relay connector for group - 10 only connects line wires from group - 10 lines to the junction circuit while relay 411 only connects test leads from group - 10 lines to junction circuit. Since there are eight groups of lines there will therefore be eight groups of relay-group connectors but only four of these groups have been represented. The unitary relays-connectors form a single group of seven relays one relay for each corresponding line in a group.

   In the present case, only four unitary relay-connectors have been shown in order to simplify the drawing. Each odd-numbered connector unit relay prepares the next even-numbered connector unit-relay circuit and each even-numbered connector unit relay prepares the next odd-numbered unit connector relay circuit as shown schematically in dotted lines. In an identical manner each odd-numbered test group relay connector, such as relay 411, prepares the circuit for the next even test group relay connector, such as relay 421. Likewise each group relay connector even test group, such as relay 421,, prepare the circuit of the next odd test group relay connector, such as relay 431 no

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 represented.

   In the upper right corner is shown the line circuit of the group line 71. Some of the rings of the stations in this line are connected to the negative wire while the others are connected to the positive wire to give this line. which we call: the divided call.



  In the lower right corner of fig. 4 shows the line circuit of a line grouping twenty earthed stations.



   Fig. 5 in its upper part shows schematically the chain of circuits between the various junction circuits of the system, relays 500 to 570 inclusive are the distributor relays and the alarm relays. The device marked TS is a time device which starts under the control of the start relay 510 and closes the springs 502 and 503 at predetermined time intervals. Relays 580 and 590 and switch 593 constitute a timing device which releases the junction circuit which would be blocked by a permanent loop.



   Fig. 6 shows the relays of the selection code CSR which are controlled by the pulse repeater relay of the junction circuit and which connect one of the son of the ringing code leading to a device giving the call rate, not shown. The calling machine, not shown, is started by the action of a switching relay in any junction circuit, it periodically earths the wires of the bell code shown to produce the codes indicated by the digits. - fres marked on these conductors.



   Briefly, the operation of the system is as follows: When a subscriber makes a call, the test lead of the calling line is marked with a certain polarity and the calling group is marked at all relays-seekers

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 start is grounded and the group finder relays in the first free trunk circuit operate in sequence to find the calling group. When the calling group is found the last group finder relay that drew connects the test lead from all lines in the calling group to the unit finder relays which operate in sequence until the line marked as caller is found.



   When the calling line is found, the trunk circuit transfer relay pulls in to prepare another free trunk circuit and the calling line is connected to the seized trunk circuit control circuit. The first digit transmitted by the calling subscriber attracts a pulse repeater relay which in turn operates the group connector relays. Only the last group relay-connector that operated remains attracted to connect the test leads of the called group to the unitary relay-connectors of the junction circuit. The second digit also attracts the pulse repeater relay which in turn attracts the corresponding unit searcher relays.

   Only the last unit searcher relay which operated remains attracted to connect the test lead of the called line to the junction circuit control circuit. The third digit transmitted causes the pulse repeater relay to operate again to select the bell code. If the called line is free, the cadence device, which is not shown, grounds the selected ringing code wire intermittently to cause the called line to ring according to the selected code.



   In the case of long distance calls, the calling line is found in a manner identical to that which has just been described and by the emission of the two digits designating a

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 long distance call the group relay-connectors and the unitary relay-connectors attract as before to make the connection with the trunk line. In this case, a code selection digit is not sent since it is not necessary.



   It will now be assumed that the subscriber of the set S in fig. 1 wishes to call the subscriber of the set S4 shown in fig. 4. When the subscriber of set S picks up his receiver, the line relay 1 attraction circuit closes as follows: positive at rest contact of armature 10, lower winding of line relay 1, wire. line 15, caller station loop, line wire 14, armature 8, top coil of relay 1, negative; to armature 5, relay 1 connects the inrush polarity to the test wire through armature 11 and the winding of cut-off relay 2;

   the armature. 6 and when the contact is idle it disconnects the cut-off relay 2 from the incoming test wire 16 and when the contact is on it earths the test wire 16 to mark the calling line at busy for all subscribers who would like to call this line. At armature7, relay 1 earths the starter wire 61 common to the lines of group - 10 to close the attraction circuit of the common starter relay 510, as follows: positive to armature 7, armature 12 and contact at rest, common starting wire 61, resistor 61 ', winding of the starting relay 510, negative.

   At armature 511, relay 510 closes the attraction circuit of relay 207, at armature 512 it prepares the blocking circuit of relays 540, 550 and 560; at armature 513 it closes the attraction circuit of relay 520, at armature 514 it prepares the circuit bypassing relay 520 and causing the attraction of relay 530 and at another armature (not shown) it closes the starting circuit of the TS time device. The circuit

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 attraction of relay 520 is as follows: positive, winding of relay 520, armatures 513, 533 and 544, resistor 546, negative. The relay 520 by attracting, prepares, to the armature 521 the attraction circuit of the relay 530 and to the armature 523 connects the winding of the relay 560 to the time device TS.

   Relay 530 is not attracting at this time because this relay is shunted by the following circuit: negative through resistor 546, armatures 544, 533, 513 and 521, winding of relay 530, negative.



   Line relay 207 attracts according to the circuit: positive to armature 501, armature 511, resistor 515, armature 531 and contact at rest, wire 281, armature 215 and contact at rest, wire 150, armature 246 and contact at rest, upper left winding of the RC translating coil, normally closed springs controlled by armature 233, winding of line relay 207, negative. At armature 230 the relay 207 closes the attraction circuit of the pulse repeater relay 303 and at the armature 231 prepares the attraction circuit of the relay 301. The attraction circuit of the pulse repeater relay 303 is the following: positive at armature 249 and contact at rest, wire 262, armature 520 and contact at rest, wire 261, armature 230, wire 260, winding of the pulse repeater relay 303, negative.

   At armature 324 and on contact with on, relay 303 closes its blocking circuit via resistor 329 and wire 261; at armature 325 it closes the attraction circuit of relay 301 and grounds wire 264; at armature 326 it opens the circuit of relays 506, 307 and 309 at one point and at armature 327 it bypasses armature 238.

   At armature 516, relay 301 prepares a high resistance attraction circuit for relay 207, at armature 317 it prepares the attraction circuit for relay / switching 217 and at armature 318 it earths the

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 wire 271 to close the attraction circuit of the slow release relay 302, as follows: positive at armature 318, wire 271, armatures 239 and 226 in multiple on wire 272, winding of relay 302.



     At armature 320, with the contact at rest, relay 302 opens the original attraction circuit of relay 303 which remains attracted by its blocking circuit which takes a positive at armature 324. At armature 320 and at contact at work, relay 302 places wire 263 to earth and closes an additional circuit for supplying relay 301 through armature 231, the contact at work and wire 264.

   At armature 321 relay 302 earths wire 265 to prepare the circuit for disconnect relay 206, at armature 322 it connects wire 275 grounded to finder ground wire 153 and closes the attracting circuit of the first group 111 finder relay, and at armature 323 it places the ground wire of connector 278 as well as the ground wire 279 through the frame 241.



   The attraction circuit of the group 111 finder relay is as follows: positive at wire 153, armature 223 and contact at rest, armature 220 and contact at rest, wire 156, resistor 190, armature 187 and contact at rest, armatures and contacts at rest of the other group searcher relays, not shown, armature 127, contact at rest of armature 127, armature 117 and contact at rest, winding up relay 111, negative.

   At the armature 116, the relay 111 closes its blocking circuit through the contacts at rest of the armatures, such as the armatures 125 and 185, group searcher relays and wire 153 grounded; to armature 118 it prepares the drive circuit of relay 110; to armature 119 it connects the wire
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 at

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 test 203 through wire 159 and armature 224; at armature 117 and when the contact is at rest it opens its original attraction circuit and when on contact it closes the attraction circuit of the second group finder relay 121.

   Relays such as relays 111, 121 and 181 are somewhat slow to act because of the rings with which they are fitted and the resistance 190.



  At the upper armatures (except armature 116) of relay 111, the group - 10 test leads are connected to the test arrays of the unitary researcher relays.



   In order to describe the operation of group pager relays, it will be assumed for a moment that the calling line is not in the first of the groups. In this case, after a short time, the relay 121 attracts as follows: positive to the earthed guard wire 153, armatures 223 and 220 and their contacts at rest, wire 156, resistor 190, armatures and contacts at rest of the relays - group researchers, armature 117 and its contact on, winding of relay 121, negative. In a manner identical to that described for relay 111, relay 121 attracts and at armature 126 hangs on the grounded wire 153.

   At armature 125, relay 121 opens the blocking circuit of relay 111 and the latter releases after a short time; at armature 127, relay 121 opens at one point its original circuit of attraction and upon contact with the working contact of armature 127 it closes the circuit of the next group searcher relay associated with group 30, not shown.



  At armature 128 the relay 121 prepares the circuit of relay 120, at armature 129 it connects the starting wire 62 of group - 20 to the group test relay 203 and to its upper armatures it connects the wires of group test - 20 to unit researcher relays. Releasing relay 111, at its upper armatures, disconnects the wires

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 group - 10, at armature 118 it opens the circuits of relay 110 and at armature 119 it disconnects the starter wire 61 from group relay 203.

   The group searcher relays 131 to 171 inclusive (not shown) and the relay 181 attract as described above, each relay opens the blocking circuit of the previous relays to release it, connects the start wire of the group corresponding to the group test relay 203, prepares the circuit of its associated line connection relay, closes its blocking circuit and connects the test wires of its group to the unit searcher relays.



   When the group finder relay corresponding to the group in which the calling line is located has attracted the attraction circuit of the group test relay 203, it closes via the start wire. For example, the relay 111 to the armature 119 closes the attracting circuit of the group test relay 203 in the event that the calling line is in group - 10 as follows: positive to the start wire set to ground 61, armature 119, wire 159, armature 224, lower winding of group 203 test relay, negative.

   In armature 218, relay 203 short-circuits its upper winding to delay its release, at armature 219 it opens the circuit of relay 202 at one point, at armature 220 it disconnects. wire 153 grounded from wire 156 to open the circuit of the next group finder relay before it has had time to attract, it closes its blocking circuit and at armature 220 and at the contacts at working it connects the grounded wire 153 to the wire 155 to cause the attraction of the first unit searcher relay 101 as follows:

   positive to wire 153 put

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 and contact on, wire 155, armature 142 and contact at rest, armature 145 and contact at rest, identical armatures of the other unitary searcher relays (not shown), armature 148 and contact at rest, winding of relay 101, negative. At armature 141, relay 101 closes its blocking circuit by means of armature 143 and the armatures of the other unit search relays (not shown), armature 143 and wire 153 placed. To the earth.

   A. armature 142 relay 101 opens its original attraction circuit and closes the circuit of relay 102; and at its highest armatures it connects the line wires of the junction circuit 150 and 151 to contacts of the group searcher relay 110 and to the armature 160 it connects the test wire 152, since the relay 111 associated with group - 10 is drawn, to test lead 19 of line 11 to prepare the circuit of line test relay 204.



   The unit searcher relays FUR by the action of the copper rings with which they are fitted are relatively slow to attract and therefore the second unit searcher relay alone operates after a sufficient time to allow the attraction of the line test relay 204 in the event that a calling line is connected to it. In the event that line 11 is not a calling line, relay 102 attracts after some time through grounded wire 155, armature 142 and its working contact.

   At armature 143, relay 102 opens the blocking circuit of relay 101 which releases after a certain time; at the armature 144 it closes its blocking circuit by means of the wire 153 placed on the ground; to armature 145 and its contact at work, it prepares the circuit of the third unit searcher relay (not shown) and to its highest armatures it connects the line wires 150 and

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 151 to the contacts of the group finder relay 110 and to the armature 124 it connects the test wire of the line 12 to the test wire 152 since the relay 111 associated with the group - 10 has drawn.



   Relay 101 by releasing at its highest armatures disconnects the test and line wires; at armature 141 it opens its own blocking circuit at one point; to armature 142 and when contact is on, it opens the original circuit for attracting relay 102 and when contact is resting for armature 142 it connects the third unit finder relay (not shown) to wire 155 grounded through the armature 145 and its contact at work.

   The unitary searcher relays 103 to 105 included (not shown) and the relay 107 attract in the manner described above, each of them to its upper armature connects the test wire of the line which corresponds to it to the line test relay 204, opens the blocking circuit of the previous relay, closes its own blocking circuit and prepares the attraction circuit of the next relay which closes when the previous relay releases.



   In this case, since the calling line is line 17, when the unitary finder relay 107 draws to. armature 147 it closes the pull circuit of line test relay 204 in series with cut-off relay 2 as follows: positive to armature 318, wire 271, top winding of line test relay 204, wire 152, armature 174, armature 114, armature 5, armature 11, winding of cut-off relay 2, negative.

   At armature 221, relay 204 by attracting, closes the attraction circuit of relay 312 and earths wire 259, at armature 222 it short-circuits its upper winding to make the relay slow to ground. release and to connect a direct earth to the wire

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 ground of wire 155 to open the circuit of the next unitary searcher relay before the latter has fully drawn; on armature 223 and when contact is on, it closes its blocking circuit by its lower winding and the attraction circuit of relay 110, finally on armature 224 it opens the circuit of group test relay 203 which released.



   The cutoff relay 2 by attracting, to armatures 8 and 10 opens the circuit of line relay 1, to armature 9 it connects its blocking circuit to the test wire 152 grounded, to armature 10 and to the contact on it closes the attracting circuit of blocking relay 3. Relay 110 attracts according to the circuit: positive to wire 153 earthed, armature 223 and contact to work, armature 225, wire 157, armature 118, winding of relay 110, negative.

   To its upper armatures, relay 110 connects the wires of the lines of the group - 10 to the contacts of the unitary searcher relays and in the case of armatures 112 and 113 it connects the calling line to wires 150 and 151 via the armatures 172 and 173 thereby closing a new line relay attraction circuit 207 and connecting the invitation tone to be transmitted to the calling line to let the subscriber know that he can start sending the subscriber's number called.



   The blocking relay 3 by attracting, at armature 11 opens the original circuit of attraction of cut-off relay 2, at armature 12 and when the contact is closed it disconnects the earth of the starter wire 61 to allow the start relay 510 to release if no other line is in call;

   and at armature 12 and on contact to work it closes its blocking circuit via the positive of armature 7. Line relay 1 by releasing at armature 6 disconnects the direct earth of the wire. incoming test 16 to its contact at work and its contact at rest con-

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 nect the positive to the incoming test lead 16 to mark this line to occupy the connector side in the Junction circuit, through the armature
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 518, wire 271, armature 222t, wire 152e of armatures 174 and 114. At armature 7, relay 1 opens the blocking circuit of the '"relay: QJ: Qc! 1ge 5.



  Group 203 test relay by releasing when
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 its circuit is open to the armature 22, closes to the armature 219 the attraction circuit of the relay 202 through its upper winding through the working contact of the armature 223 and the wire 153 grounded. At armature 217, relay 202 forms the circuit of the
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 transfer 201. i The armature 21 ° the relay 201 prepares its blocking circuit, at the armature 215 it opens the original circuit of attraction of the line relay 207 maintained drawn now through the loop of the calling line;
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 at work contact of 1 + aPmafuBeF 215 it connects wire 281 to wire 282 so that the next call can enter the junction circuit. free next.



   The attraction circuit. of relay 312 is as follows: positive to armature 249 and its contact at rest, wire 262, armature 221, wire 259, armature 330 and its contact
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 at rest, winding of relay 312, negative. At armature 362, relay 312 prepares its blocking circuit, at armature 365 it prepares the circuit of the lower armature of relay II, this latter not attracting at this moment because its lower winding is shorted. é by armature 563, armature 330 and its contact at rest and the normally closed springs controlled by armature 337. In armatures 364 to 367 included, relay 312 prepares the impulse circuit towards the relays -group connector.



   The relay 510 releases in the event that. no other line is under appeal at this time and at frame 511 it

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 Theis 510 opens the shunt of the relay circuit 530 which now draws in series with the relay 520 through the armature 521.

   The relay 530 by attracting to the armature 551 transfers the starting circuit from the beginning of the chain to the middle of this one, to the armature 532 it prepares the short circuit of the relay 520 and the attraction circuit of the relay 550; at armature 533 it quires at another point the low resistance shunt of relay 530 and at armature 534 it disconnects the time device TS from relay 560 before the time device has had time to make relay 560 attract.



   At this point in the discussion it may be useful to consider how the distribution relays operate when a second call occurs while relay 530 is attracted. In the current case the start relay 510 draws via the common starting wire as before and to the armature 511 it completes the starting circuit and grounds wire 281 'as follows: positive to armature 501, armature 511, resistor 515, armature 531 and its working contact, starter wire 281 'terminating in the junction circuit in the middle of the chain.

   At armature 514, relay 510 connects the earthed armature 543 through armature 532 to the winding of relays 520 and 530, as a result, relay 520 is short-circuited and that 'it releases while the relay 530 remains attracted according to this circuit. Relay 520 on releasing to armature 522 connects springs 503 of the. TS time device to relay 560 winding.



  When the calling line is found the relay 510 releases and removes the ground from the starter wire 281 'at 1t armature 511. At armature 514 the relay 510 opens the circuit of relay 530 which releases. At armature 531, relay 530 transfers the starting circuit to the start of the chain

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 and at armature 534 it disconnects the time device TS from the coil of relay 560.



   The circuit for blocking the line relay 207 through the loop of the calling line is as follows: positive to armature 256, closed contact and armature 247, wire 151, armatures 175 and 113, line positive wire 15, extension caller, negative line wire 14., armatures 112 and 172, wire 150, armature 246 and its contact at rest, upper left winding of the RC translator coil, normally closed springs controlled by armature 233, winding of the relay of line 207, negative.

   The invitation to be transmitted is also connected to the calling line at this time by the following code: sending thread of the invitation to be transmitted DT, fig. 3, contact at rest and armature 328, capacitor TC; wire 254., idle contact 246 then to the calling line as described above *
The calling subscriber having heard 11-invitation to transmit, transmits the group and line digits followed by the code selection digit, it will be assumed that these digits are 7, 1 and 0 respectively. Line relay 207 releases on each pulse. Under the action of the first pulse, relay 207 to armature 230 opens the circuit of pulse repeater relay 303 which releases.



  At armature 231 and its contact at rest, relay 207 closes a high resistance circuit, as follows: positive at wire 262, armature 320 and its contact on, wire 263, armature 231 and its contact at rest, wire 257, armature 316, resistor 319, wire 254, upper left winding of the RO translator coil, normally closed springs controlled by armature 233, winding of line relay 207, negative. This circuit which is not able to attract line relay 207 due to resistor 319 helps
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 the relay 207 to attract nnanr) e-¯ ..; ¯¯ -

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 line with poor insulation. At armature 231 and its working contact one of the multiple earth connections of relay 301 is open.



   When releasing the pulse repeater relay 505, the armature 324 opens its blocking circuit at one point; at armature 325 opens the relay circuit at one point
301 but the latter due to its delay in release remains attracted during the sending of the pulses; to the frame
326 it closes the attraction circuit of relays 306, 307 and 309. The attraction circuit of relays 306 and 307 is as follows: positive to wire 262 grounded, armature
320 and its contact on, normally closed springs controlled by armature 326, armature 333 and its contact at rest, upper winding of relay 306 and winding of relay 307, negative. A branch of this circuit extends through the armature 348 and its contact at rest and through the upper winding of the relay 309 to attract the latter.

   At armature 336 relay 306 connects wires 254 and 258 which bypasses the upper left bearing of the RC translator coil in order to improve the pulse circuit; in frame 337 it closes the blocking circuit of relay 312 by means of wire 259 grounded and armor: 357 and 362; to armature 338 it prepares the attraction circuit of relay 304 and the circuit passing through the lower windings of relays 308 and 309, to armature 339 it closes the occupancy relay circuit at one point 305 and armature 340 11 disconnects wire 259, grounded, from wires 269 and 394.



   Relay slow to release 307 pulling, armature 342 'prepares relay blocking circuit
309; to armature 343 it closes the blocking circuit through the lower winding of relay 306 through the inter-

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 medial of the earthed reinforcement 376; and in frame 345 it closes at one point the circuit of the first relay-connector of group 411. The relay 307, due to its delay on release, remains attracted during the sending of the pulses and does not release until shortly after the release. dispatch of each of the trains.



   The relay 309 by attracting to the armature 349 prepares at a point the attraction circuit of the relay 308 and of the blocking circuit of the relay 309; on the armature 350 it prepares a new attraction circuit for the pulse repeater relay 303. and the circuit of the relays 508 and 309 through their lower windings; at armature 351 it prepares the circuit of the lower windings of relays 308 and 309; at armature 352 it disconnects the earth at armature 376 from the wire of the even pulses 386 and connects the earth to the wire of the odd pulses 384; on armature 353 it closes the attraction circuit of the group 411 relay-connector as follows:

   positive to guard wire 278, armature 442, 452 and 465 of the CGR group relay-connector and wire 389, contact on duty and armature 366, contact at rest and armature 360, armatures 345 and 353, armature 361 and contact at rest, armature 367 and contact on, wire 391, winding of relay 411, negative. Relay 411 at its highest armatures connects the test leads of the lines of group - 10 to the unitary connector relays CUR, at armature 490 it closes its blocking circuit to the earthed ground wire 278 by the 'intermediate reinforcements 465, 452 and 442; and at armature 492 it prepares the circuit of relay 410.



   At the end of the first pulse line relay 207 attracts again into the calling party loop circuit and closes the relay attraction circuit
 EMI19.1
 rr. ---- ".J 1 --- '-.

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 circuit of relays 309 and 308 through their internal winding. At armature 231, relay 207 opens its excitation circuit and closes the circuit of slow relay on release 301 to keep the latter attracted. The attraction circuit of relay 303 is as follows: positive at armature 350, contact at rest and armature 347, wire 261, armature 230, wire 260, winding of relay 303, negative.



  A branch of this circuit extends through wire 260, armatures 342, 366 and 349 through the lower windings of relays 308 and 309 and through armature 351 to relay 304. A l 'arming 324 relay 303 again closes its blocking circuit; at armature 325 it again closes another attraction circuit for relay 301;

   with normally closed springs controlled by armature 326 it opens the original circuit for attracting relays 306, 307 and 509, and at armature 326 and its contact on it closes the circuit for attracting the relay 304 through the ground wire 263 of armature 338 and gives another circuit through the lower windings of relays 308 and 309,
Relay 308 attracts by its lower winding, at armature 346 it opens its traction circuit at one point, at armature 347 it opens the original circuit of attraction of relay 303 which remains attracted by its own. blocking circuit;

   at armature 348 and its contact at rest it opens the original circuit of attraction, relay 309 and sound. contact at work he prepares his blocking circuit.



  Relays 508 and 309 at this time are kept attracted by the following circuit: positive to wire 263, open contact and armature 326, armature 338, armature 351, lower windings of relays 308 and 309, negative. Relay 304, pulling, to armature 328 disconnects the tone

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 invitation, to transmit and prepare the circuit for sending the return call to the calling subscriber, to the armature 330 and its contact at rest it opens the original circuit for attracting relay 312 and to his contact. to. working it closes its blocking circuit on the grounded wire 359 at the same time as it opens its original circuit of attraction.

   At this moment, relay 312 is kept attracted by the following circuit: positive to grounded wire 259, contact on and armature 337, armature 357 and contact off, armature 362, winding of relay 312, negative.



   Under the action of the second pulse of the first series, line relay 207 releases again and at armature 230 opens the circuit of pulse repeater relay 303, while at armature 231 the slow release relay multiple circuit 301 is open and the line relay energizing circuit is closed again.



  The relay 503 by releasing the armature 324 again opens its blocking circuit; at armature 325 it opens again the circuit of slow relay on release 301, at armature 326 it opens the blocking circuit passing through the lower windings of relays 308 and 309, and to normally closed springs controlled by armature 326 it closes the blocking circuit of the relay 308 through its upper winding and closes the circuit of the slow relay on release 307 before it releases.

   The relay 309 by releasing at the armature 350 prepares the attraction circuit of the relay 303, at the armature S51 it opens at another point the blocking circuit through their lower windings of the relays 308 and 309; to armature 352 it connects the positive e of armature 375 to the wire of even pulses 386 to close the attraction circuit of the next group connector-relay, in this case relay 421, and to the armature
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 The circuit for attracting relay 421 is as follows: positive at armature 376 and at idle contact, armature 545, armature 352 and contact at. rest, armature 359 and contact at rest, armature 365 and contact on, wire 386, armature 491, winding of relay 421, negative.

   The relay 421 by attracting, connects to its highest armatures the test leads of the lines of the group - 20 to the unit relays-connectors, to the armature 465 it opens the blocking circuit of the relay 411 which releases, to the 'armature 466 it closes its blocking circuit through the intermediary of the grounded wire 278 and armatures such as 442 and 452; at armature 467 it prepares the circuit of relay 420, at armature 468 it connects the next group connector relay 431 (not shown) to the wire of odd pulses 384, and at armature 469 it prepares the 600 code switching relay circuit.

   Relay 411 released at its highest contacts opens the circuit of the test leads of the lines of group - 10, at armature 490 it opens its blocking circuit, at armature 491 it opens the original attraction circuit of relay 421 which is blocked, and at armature 492 it opens the circuit prepared towards relay 410,
Line relay 207 re-attracts into the loop circuit of the calling line at the end of the second pulse and to armature 230 closes the circuit for attracting relay 303 through the idle contact of the armature 350 and the on contact of armature 347, while at armature 231 the circuit of slow-to-release relay 301 is closed again.

   The relay 303 by pulling the armature 324 again closes its blocking circuit, at the armature 325 it again closes the circuit of the relay 301 at another point and at the armature 526 it opens the circuit. locking through its upper winding of the

  <Desc / Clms Page number 23>

 relay 308 which releases. Relay 308 by releasing, at armature 346 prepares at one point the original circuit of attraction of relay 308, at armature 347 it opens the circuit of attraction of relay 305 which remains attracted now by its circuit of blocking, and at armature 348 it opens its own blocking circuit at one point and prepares the circuit for relay 309.

   From the above it can be seen that relay 303 follows the pulses of line relay 207; that the relays 308 and 309 attract from the first pulse and for each odd pulse; that the relays 308 and 309 release on the second pulse and on each even pulse; that relay 309 earths the odd pulse wire 384 when it attracts and earths the even impulse wire 396 when it releases to successively attract group relays 411, 421 etc. The pull circuit of the pulse repeater relay 303 is taken through the armatures 347 and 350 so that the circuit of the relay 303 cannot / close until the relays 308 and 309 have not attracted or released.



   As is known, a line relay such as the re-. lais 207 may be braked on release due to lack of isolation of the calling line or if it is heavily loaded. In order to ensure a correct transmission of the pulses a device called a pulse filter device has been provided. In this device the armatures operated by the line relay 207 have a hard adjustment and the armatures operated by the pulse repeater relay have a very hard adjustment such that this relay will release very quickly when its circuit is momentarily. opened by line relay 207 to armature 230.



  When relay 303 releases such a relay cannot attract again until repeater relays 308 or 309
 EMI23.1
 attracted or released nanr -fot * mc- t A¯A¯4 - # - * - --- A

  <Desc / Clms Page number 24>

 if the line relay has immediately re-drawn. The relays 308 and 509 do not have to be fast to pull in order to repeat the pulses received.



  In addition, an excitation circuit or artificial line loss has been provided for the line relay 207 through its contacts at rest to facilitate its reallocation in the case of long lines. This pulse circuit in combination with the circuits of the odd and even pulses has proved that it constitutes a device giving full satisfaction in the case of lines having variable electrical characteristics, which until now had prevented their transformation into automatic lines.



   Under the action of the third pulse, the relays 207 and 503 release and the relay 303 causes the attraction of the relay 309 as described previously for the first pulse. When relay 309 grounds odd wire 384, third group relay connector 431 (not shown) draws through even wire 384 to frame 468.

   In the manner described for relay 421, relay 431 (not shown) closes its uppermost armatures to connect the test leads of group - 30 to the unit relays; it opens the blocking circuit of the. relay 421 which releases; it closes its own blocking circuit; it prepares the circuit of the line connection relay which is associated with it (not shown) identical to the relay 420; it connects the test group relay connector of group - 40 (not shown) to the even wire 386. At the end of the third pulse the relays 207, 303 and 308 attract in the manner described at the end of the first pulse.



   Under the action of the fourth pulse, the relays 207, 303 and 509 release in the manner described for the second pulse. When relay 309 grounds the even wire 386 the group connector relay (not shown) of the

  <Desc / Clms Page number 25>

 group - 40 attracts in a manner identical to that which has already been described. This group relay connector connects the group test leads - 40 to the single relay connectors; it opens the blocking circuit of the group relay-connector - 30 which releases; it closes its blocking circuit; it prepares the associated line connection relay circuit (not shown) and connects the group test group relay-on - 50 (not shown) to the even wire 384.



   As just described, each odd pulse earths the odd wire 384 to attract the corresponding group connector relay and each even pulse earths the even wire 386 to cause the relay to pull. -corresponding group connector. The group relay connectors 431 to 461 and their associated line connection relays 430 to 460 are not shown because their operation is identical to that of the group connector relays shown. Under the action of the 7th pulse, the odd wire 384 is grounded by the relay 309, it attracts the group 471 relay-connector of the group - 70 through the armature 456 of the relay- group connector - 60.

   Relay 471 at its highest armatures connects the test leads of the group lines - 70 to the unit connector relays, at 1 + armature 452 it opens the blocking circuit of the last group relay-connector operated, at the armature 453 it closes its blocking circuit, to armature 454 it connects the relay-connector of group 481 of group - 80 to the even wire 386, to armature 455 it prepares the attraction circuit of the connection relay of line 470 of group - 70 and at armature 456 it prepares the circuit of the bell reversing relay 314.



   Relays 207 and 303 remain attracted after sending

  <Desc / Clms Page number 26>

 of the last impulse of the train, and after a short instant the slow relay on release. 507 let go. In frame 343, relay 307 opens at one point the pulse circuit and the blocking circuit of relay 306 which releases, at armature 345 it opens the original circuit of attraction of relay 411.

   Relay 306 by releasing, at armature 336 removes the short-circuit of the upper left winding of the translating coil Ra, at armature 357 it opens the blocking circuit of relay 312 and substitutes for it the circuit which passes through the lower winding of relay 311 in series with the winding of relay 312, thereby relay 312 remains attracted and relay 311 draws into the circuit which includes grounded wire 259 and the relay winding 312.

   At armature 338, relay 306 opens the circuit of relays 308 and 309 which release if they are attracted at the moment, at armature 339 it opens at one point the circuit of occupancy relay 305 and at armature 340 it reconnects wire 259 grounded to wires 1369 and 394.



  The relay 311 by drawing in series with the relay 512, to the armature 357, prepares its blocking circuit, to the armatures 358 and 559 it prepares the impulse circuits via the odd and even wires 383 and 385 towards the relays -unit connectors and to armatures 360 and 361 the connection circuit of the grounded ground wire 278 to wire 590,
The calling subscriber can from this moment send the second digit of the called subscriber number. In a manner identical to that already described, the line relay 207 and the repeater relay 303 release on each pulse and under the action of the first pulse the circuit for attracting the relays 306, 307 and 309 closes.

   The relay 506 pulling the armature 337 opens the blocking circuit of the relay 312 to cause the release of this relay and closes the blocking circuit of the relay 311 through its winding.

  <Desc / Clms Page number 27>

 ment higher to keep him attracted. As a result of the attraction of relays 307 and 309, the attraction circuit of the first unitary relay-connector 401 is closed. Relay 312 by releasing to armatures 364 to 367 prepares the pulse circuit to the code selection relays CSR.



   Relay 401 attracts according to the circuit: positive to grounded guard wire 278, armatures 412, 416 and similar armatures of the unitary relay connectors (not shown), armature 432, wire 387, work contact and armature 560, 345 and 353 armatures, 361 armature and NO contact, wire 590, winding of relay 401, negative, To armatures 492 and 493, relay 401 connects the conversation wires 252 and 256 of the junction circuit to the group relay-connectors ; to armature 494 it connects test wire 382 to test wire 34 of line 71, to armature 435 it closes its blocking circuit to earthed ground wire 278 via the armatures of the relays- unoperated single connectors;

   at armature 436 it prepares the circuit of the next unit relay-connector 402, at armature 437 it prepares at one point the circuit of junction switching relay 213 and at armature 438 it puts wire 392 at the Earth. Line relay 207 draws at the end of each pulse and closes the pull circuit of pulse repeater relay 303 again when relays 308 and 309 have drawn or released as previously described.



   In order to describe the operation of the unitary connector relays, it will be assumed that the second digit transmitted is greater than 1. The relays 207, 303 and 309 release in the manner already described, when the second pulse is sent. At armature 353, relay 309 opens the circuit of unitary relay-connector 401 which remains attracted now -

  <Desc / Clms Page number 28>

 through its blocking circuit; at armature 352 it disconnects the earth of the odd pulse wire 383 and connects this to the even impulse wire 385 to attract the second unitary relay-connector 402.

   This circuit takes the following path: positive at armature 376 and its contact at rest, armature 343, armature 352 and contact at rest, armature 359 and contact on duty, even impulse wire 385, armature 436, winding of relay 402, negative.



  At its two uppermost armatures, relay 402 connects the line wires of the junction circuit 252 and 255 to the contacts of the group relay connectors; to the third upper armature it connects the test wire 382 of the junction circuit to the test wire 72 of the line by means of an armature operated from the relay-connector of group 471, to the armature 433 the relay 402 closes its blocking circuit to the guard wire 278 earthed by the intermediary of the armatures 412 and 416 and the similar armatures of the other unitary relay-connectors (not shown}; at the armature 432 it opens the blocking circuit relay 401 which releases; to the armature 434 it connects the third unitary relay-connector 403 (not shown) to the odd impulse wire 383.



  At the end of the second Pulse the relays 207 and 303 re-attract and the relay 308 releases as described above.



   Under the action of the third pulse, relays 207 and 303 release and relay 309 re-draws to ground the odd pulse wire 383 as previously described. The third unitary relay-connector (not shown) is operated to make the connection of the test lead of line 73; to unblock the second relay-connector-unit 402 which releases; to lock to ground wire 278 and to connect the fourth unitary relay-connector (not shown) to even pulse wire 385. The

  <Desc / Clms Page number 29>

 relays 207, 303 and 308 draw at the end of the third pulse as previously described.



   Under the action of the fourth pulse, the relays 207, 303 and 309 release as described previously. At the armature 552, the relay 309 places the even pulse wire 385 to the ground to attract the fourth relay-connector. unitary, The fourth unitary relay-connector operates the connection of the test lead of line 74; unblocks the third unitary relay-connector which releases; hangs on guard wire 278; connects the fifth unit connector relay 405 (shown in dotted line) to the odd impulse wire 383. As described above the remainder of the unit connector relays attract and release under the action of subsequent pulses to connect the test leads of the lines that follow one another in the group to the test lead of the junction circuit 382.

   In the current case the subscriber S4 of line 71 is the called subscriber, the second digit therefore only comprises a single pulse and consequently it is the unitary connector-relay 401 which attracts to connect the wire. test 34 from line 71 to test lead 382 of the junction circuit.



   After sending the second pulse of the second digit, the relays 207 and 303 remain on and the relay 307 releases after a certain time. At the armature 343 the relay 307 opens the blocking circuit of the relay 306 which releases. The relay 306 by releasing the armature 337 opens the blocking circuit of the relay 311 which releases likewise; at armature 338 it opens the circuit which crosses the lower windings of relays 308 and 309 to release them if they are operated; and at frame 340 it puts wires 269 and 394 to the ground. The relay 311 by releasing the armature 357 opens its blocking circuit at one point;

  <Desc / Clms Page number 30>

 pulse to the code selection relays shown in fig. 6.



   The calling subscriber now transmits the third digit or code selection digit of the desired subscriber line. Line relay 207 follows the pulses transmitted by the calling subscriber which again does, releasing relay 303 with each pulse. The relays 306, "507 and 309 attract in a manner identical to that which has been described previously. In the armature 339 the relay 306 prepares the circuit of the occupation relay 305. In the armature 343 the relay 507 closes the blocking circuit of relay 306 and at armature 345 it prepares the pull circuit of relay 610.

   At armature 552, relay 309 places the odd impulse wire 398 to earth under the action of the first impulse and at armature 355 it closes the attraction circuit of relay 610. ' This circuit takes the following path: positive at armature 323, wire 278, armature 241, wire 279, armatures 652, 642, 632 and 622, wire 395, armatures 367, 361, 353, 345, 360 and 566, wire 596, coil of relay 610, negative.



   The first code selection relay 610 draws in the circuit described above and at armature 611 closes the draw circuit of the occupancy relay 505 in series with the test relay 515 in the event that the called line is busy. At armature 613, relay 610 closes its blocking circuit through armatures 622, 632, 642 and 652 to grounded guard wire 279; to armature 614 it connects the second code selection relay 620 to the even pulse wire 397 'and to armatures 615 and 616 it prepares the codified call circuit at one point.



  At the end of the first pulse, the relays 207, 503 and 308 attract as before.



   Under the action of the second pulse, the relays

  <Desc / Clms Page number 31>

 207, 303 and 309 release as described above. At armature 353, relay 309 opens the original circuit for attracting relay 610 which remains attracted by its blocking circuit; at armature 552 it puts the even impulse wire 397 to earth to attract relay 620.



  This circuit takes the following path: positive at armature 376 and its contact at rest, armature 343, armatures 552, 359 and 364 and their contacts at rest, wire 397, armature 614, winding of relay 620, negative. To armature 621, relay 620 connects test relay 315 in series with occupancy relay 305 to determine if the called line is free or busy, to armature 622 it opens the blocking circuit of relay 610 which releases ; to armature 623 it connects its blocking circuit to earthed ground wire 279, to armature 624 it connects the third code selection relay 630 to odd impulse wire 398 and to armatures 625 and 626 it prepares certain points for the codified calling circuit.



   The code selector relays 630, 640 and 650 attract under the action of the third, fourth and fifth pulses because the relay 309 alternately grounds the odd and even pulse leads 398 and 397.



    Each code selection relay that attracts opens the blocking circuit of the previous code selection relay to cause its release. Under the action of the sixth of the pulse wire, relay 660 draws into the pair / pulse circuit 397. At armature 661, relay 660 closes the occupancy test circuit, at armature 663 it is blocked by the through the guard wire 279; at armature 664 it opens its original circuit of attraction after closing its blocking circuit; at armature 665 it switches from one group of ringing code contacts to the other

  <Desc / Clms Page number 32>

 of the bell reversal relay 314.

   This circuit takes the following route: positive to armatures 456 and 438, wire 59Z, armature 666, wire 379, winding of relay 314, negative. At armatures 371 and 372 relay 314 reverses the inrush circuit connections so that the generator will now be connected to the positive wire of the line instead of to the negative wire. The dotted line 446 shows that the bell reversing relay 314 can be operated similarly when other group digits are transmitted and the dotted line 292 'indicates that the circuit can be established through armatures identical to the one. armature 666, other selection relays
 EMI32.1
 coded.

   Under the action of the seventh pulse, relay 309 to armature 353 closes the attraction circuit of relay 610 as follows: positive to ground wire 279, armature 663, armature 664 and contact on, armatures 642, 632 and
 EMI32.2
 622, 395 wire, 567, 36l, 355, 345, 360 and 566th wire 396 and coil of relay 610, negative. The relay 610 activates its armatures, the results of this operation have been described above, in addition to the armature 612 it opens the blocking circuit of the code selection relay 650 to release it.

   Under the action of the Se, 9th and 10th pulses, the code selection relays 620, 630 and 640 respectively attract and block, and release the code selection relay which operated before it in the manner described above. . From the above it can be seen that the code selection relays 610, 620, 630, 640 and 650 attract under the action of the first 5 pulses of the code selection digit, which the relays 650 and 660 attract at the 6th pulse, that the relays 610 and 660, 620 and 660, 630 and 660, 640 and 660 attract under the action of the 7th, 8th, 9th and 10th impulse.



   In the event that the line is busy, the standby circuit

  <Desc / Clms Page number 33>

 pull of occupancy test relay 505 closes, at the first pulling time, in series with the marginal test relay circuit 315 as follows: positive to test lead 34 of the called line, armatures 474 and 494, 382, upper winding of the test relay. marginal 515, wire 381, one of the operated contacts of the multiple contacts 611, 621, 631, 641, 651 and 661, wire 394, resistor 341, armature 339, winding of the busy test relay 305, negative.

   Occupancy relay 305, owing to the presence of resistor 341, only attracts its armature 334 to prepare its complete attraction circuit when later relay 506 releases. After sending the last code selection pulse, the relays 207 and 303 release again and the relays 306, 307, 508 and 509 release as described previously. Relay 306 on releasing at armature 339 closes the complete pull circuit of occupancy test relay 305 as follows: positive to wire 259, armature 334 and its contact on, normally closed springs controlled by Armature 339, winding of occupancy relay 305, negative.



   Assuming that the called line is free, the busy relay 305 does not attract because no earth is connected to test lead 34 of the called line. When relay 306 releases after the emission of the code selection digit, the attraction circuit of test relay 315 closes in series with that of cut-off relay 22 of the called line, as follows: positive at wire 259, armature 334 and NO contact of busy test relay 305 not operated, armature 340, wire 394, armature operated from armature group 611 to 661, wire 381, upper winding of test relay 315, wire 382, armatures 494 and 474, wire 34, armature 25 and contact:

   at rest, winding of cut-off relay 22, negative. At armature 377, relay 315 closes

  <Desc / Clms Page number 34>

 armatures, as follows: positive to normally closed springs controlled by armature 228, wire 275, armature 322, wire 153, armature 377, lower winding of test relay 315, negative.

   At armature 373, relay 315 prepares the circuit for connecting earth to the negative wire of junction circuit 252 since the bell reversing relay 314 is attracted, at armature 374 it prepares the circuit connecting the generator to the generator. positive wire of junction circuit 255, at armature 375 it connects a direct positive to wire 382 to mark the line called for occupancy; at armature 376 it grounds wire 268 to attract the selected group relay-connector, in this case relay 470 and at armature 578 it prepares the circuit for attracting relay 670.



   The attracting circuit of the group relay connector 470 is as follows: positive at armature 376 and contact on duty, wire 268, armature 455 of the operated group relay connector 471, winding of relay 470, negative.



  To armatures 472 and 473 the relay 470 connects the line wires 32 and 33 of the called line to the wires of the Junction circuit 252 and 255. When the cut-off relay 22 pulls in series with the relay 315, to the armatures 27 and 29 it disconnects the line relay 21 from the line wire 32 and from the earth, to the armature 28 it connects the test wire set to. the earth 34 to the researcher 35 test wire to mark this line at Unoccupied on the researcher side and at the armature 29 it closes the attraction circuit of the guard relay 23.



  The relay 23 to the armature 31 opens the circuit of the starter wire 67 at one point.



   At the start of each cycle of the ringing code given by the calling machine (not shown), the latter earths the PU wire and closes the attraction circuit of relay 670 as follows: positive to the PU wire coming from the call machine

  <Desc / Clms Page number 35>

 pel, normally closed springs controlled by armature 672, wire 380, armature 378, wire 276, armature 240, wire 277, relay winding 670, negative, At armature 671 relay 670 prepares the call relay circuit 313; at frame 672 he opens his. original circuit of attraction and end of its blocking circuit on the guard wire 279 and on the armatures 673 and 674 it prepares in other points the circuit of the call relay 313.



   The calling machine is provided to ground the bell code wire at certain definite times during its operating cycle as shown in the lower left corner of fig. 6.



  For example 4 - 4 means this wire is set to. earth at certain well-determined times in each cycle to attract the call relay 313 which sends four short ringing trains, followed by a pause and then four short trains. In the present case, assuming that the ring code 2 - 2 wire has been selected, the relay 313 draws as night: positive to the calling machine by the wire marked 2 - 2; NC contact and armature 601, armature 645 and 673, NC contact and armature 665, wire 680, armature 671, wire 599, call relay winding 313, negative.

   Ringer code wire 2 - 2 was selected because it was assumed that the transmitted code selection digit was 0 and in this case the 640 and 660 code selection relays pulled in and were blocked . Each time the call relay attracts, at armature 368, it connects the earth, through armatures 371 and 373, to the negative wire of junction circuit 252 since relay 314 is attracted. , to the armature 369 it connects the generator to the positive wire of the junction circuit 255 via the wire G and the armatures 372 and 374;

   to the frame 370 it closes

  <Desc / Clms Page number 36>

 the pulses transmitted by the bell relay 313, as a result of its delay in releasing this relay releases after the bell relay 313 and to the armature 354 it momentarily connects, after each sending, a negative through the resistor 355 to the negative lead of junction circuit 252 to discharge the capacitors associated with the rings in the called line circuit. At armature 356, relay 310 closes the ringing tone circuit to the calling subscriber, as follows: (Generator and wire G, contact on and armature 356, contact on and armature 328, capacitor TC , wire 254 and caller loop as previously described.



   The ringing current is sent to the called subscriber according to the circuit: Generator, wire G, contacts on and armatures 372, 369 and 374, positive wire of the Junction circuit 255, armatures 493 and 473, wire 33 , rings connected to the positive wire of the line, positive. In the case where. the ringers of the line in question are bridged instead of being grounded the ringing current return circuit borrows the negative wire 32 of the line, the armatures 472 and 492, the wire 252, the armatures 373 , 368 and 371, and the positive.



   When the subscriber 84 answers the call during a period of silence, that is to say when the relay 313 is released, the relays 211 and 212 attract in the case where the called line is constituted by a circuit. metallic, while only relay 211 attracts if the called line is a grounded line. the attraction circuit of relays 211 et ala in the case of a metallic line is as follows:

   positive, winding of relay 212, lower right winding of the RC translator coil, wire ¯356, -non- tact at rest and armature 369, armature 374 and circuit of the line called as described previously for sending the

  <Desc / Clms Page number 37>

 ringing current, return via wire 252, armatures 373 and 368, wire 253, upper right winding of the RC translator coil, armatures 238 and 327 in parallel, winding of relay 211, negative.

   In the case where. the called line is a grounded line the relay 212 is short-circuited as follows: positive to the positive wire of the called subscriber line, armatures 473 and 493, wire 255, armatures 374 and 369, wire 256, RC transfer coil lower right winding, relay 212 winding, positive.



   The relay 211 by attracting the armature 242 and the contact at rest opens at one point the circuit of the relay 206 and its contact at work closes the attraction circuit of the relay 210. At the armature 243 the relay relay 211 closes the attracting circuit of the polarity reversal relay 209 in the event that the calling line is of the type requiring polarity reversal for the purpose of supervision. The attraction circuit of relay 210 is as follows: positive at armature 321, wire 265, armature 242 and contact on, normally closed springs controlled by armature 237, winding of relay 210, negative.

   To the armature 237 the relay 210 loops the blocking circuit on the grounded wire 259 and opens its original circuit of attraction; at frame 238 it closes the conversation circuit. at armature 236 it removes the short-circuit of relay 208 to allow its attraction in the case where. the calling line is a metal line, at armature 239 it opens one of the multiple circuits of relay 502, at armature 240 it opens the circuit of relay 670 which releases and at armature 241 it disconnects the positive of the wire from guard 279 to release the code selection relays which attracted.

   The relay 208 draws in series into the loop of the calling subscriber and the relay 207 in the case where the calling line is a metal line.
 EMI37.1
 "'t'ta e. ++ - 01.". o ....., ..........: .t. the - -

  <Desc / Clms Page number 38>

 normally closed springs controlled by armature 234, lower left winding of the RC translating coil, idle contact and armature 247, wire 151, armatures 173 and 113, positive wire 15 of line 17, calling subscriber loop and circuit described above, winding of relay 207, negative. In the event that the calling line is a grounded line the positive line wire, such as wire 15, is grounded and relay 208 does not attract.

   The relay 208 by pulling, if the calling line is a metal line, to the armature 232 closes the pull circuit of the polarities reversal relay 209 if the calling line is in a group which requires the polarities reversal for supervision needs, in this case the wire 158 is connected to contacts such as the contacts 118, which connect it to the wire 157 which is grounded, a circuit therefore closes via the armature 243 to operate the pulling of the polarities reversal relay 209.



   All code selector relays in fig. 6 now release and relay 660 to armature 666 opens the ring reversal relay circuit 314, relay 670 to armature 671 opens the circuit for the ringing relay. ringing 313. The relay 209 by attracting the armatures 233 and 234 reverses the polarities of the calling line and the armature 235 closes its blocking circuit independently of the armature 232.



   When the calling line is a metallic line, the talk current is supplied through the windings of relays 207 and 208 and through the left windings of the RC translator coil, via the idle contacts and the armatures 247 and 247, the wires 150 and 151 to the caller loop. In the event that the calling line is a grounded line, the talk current is supplied through the coil of relay 207 and through the wire.

  <Desc / Clms Page number 39>

 positive ground of the calling line.

   When the called line is a metallic line, the conversation current is supplied through the windings of relays 211 and 212 and following the circuit previously described through the called subscriber loop, the circuit of relay 211 borrows. the upper right winding of the RC translating coil via wire 266, armature 327 and wire 267. In the event that the called line is a grounded line the talk current is supplied through the winding of relay 211 and by the positive earthed wire of the called line.



     .after the conversation, when the called subscriber has hung up the relays 211 and 212 release. At armature 243, relay 211 opens the circuit of relay 209 in the event that. this has attracted and at armature 242 it prepares the circuit of release relay 206 so that the trunk circuit will be automatically released after a certain time, if the calling subscriber neglects to hang up. The polarities reversal relay 209, if it has attracted, releases and reverses the polarities of the calling line for the needs of the supervision .. when the caller hangs up the line relay 207 releases as well as the relay 208 s' he drew.

   At armature 230, line relay 207 opens the circuit of relay 303 which releases and at armature 231 it opens one of the multiple earth circuits of slow release relay 301. Relay 303 by releasing on release. armature 325 opens the circuit of slow relay on release 301; at armature 327 it disconnects relay 211 from wire 253 and at armature 326 it closes the circuit of relays 306, 307 and 309. Relay 301 by releasing at armature 318, opens the circuit of relay 302 and disconnects ground of test lead 152 to open the cutoff relay 2 circuit.
 EMI39.1
 .; 1- --....-.....-- - .... ¯ A¯L¯s 1 --- ¯ī¯¯ w ¯ - .....

  <Desc / Clms Page number 40>

 guard relay 3 and armatures 8 and 9 connect line relay 1 to the calling line.

   After a short time the guard relay $ releases and at armature '12 prepares the circuit for starter wire 61.



   The slow release relay 302 by releasing at armature 320 disconnects the earth of relays 506, 307 and 309 to release them, at armature 321 it disconnects the earth of wire 265 to open the relay circuit at one point disconnection 206; at armature 322 it opens the blocking circuit of relay 515 and disconnects the earth of wires 153 and 157 to unlock the group searcher relays 110 and 111 which have attracted, the unit searcher relay 107 which has attracted and the relays 204: and 202. At the armature 323, the relay 302 disconnects the earth of the ground wire 278 to unlock the unitary relay-connector 401 and the group relay-connector 471.

   The relay 401 by releasing at the armatures 492, 493 and 494 disconnects the wires of the line 71 from the wires of the control relays of the junction circuit.



  Releasing relay 471 at armature 474 disconnects test wire 34 from the junction circuit thereby opening the cut-off relay circuit 22. At armature 455, relay 471 opens the circuit of relay 470 which releases and disconnects line wires 52 and 33 from the junction circuit. Relay 315 on releasing to armature 375 disconnects ground from test lead 58a; at armature 376 it disconnects the earth of wire 268 to open the circuit of relay 470 at another point; and at reinforcements 373 and 374 it opens the conversation circuit. Relay 204 by releasing at armature 221 opens the blocking circuit of relays 210 and 304 which release.



   Relay 110, when releasing, at armatures 112 and 113 disconnects line wires 14 and 15 from the transfer coil Rc. Relay 111 on releasing at armature 114 disconnects the test lead from the line from test lead 152. The re

  <Desc / Clms Page number 41>

 Leaving 107 by releasing at reinforcements 172, 173 and 174 disconnects the control relays of the junction circuit of the calling line. Relay 202 on releasing to armature 217 transfers transfer relay 201 from direct earth to wire 281 of the starter string so that if wire 281 is grounded at this time relay 201 will not release. and will not interfere with the operation of another trunk circuit.

   In the event that wire 281 is not grounded, relay 201 releases and armature 216 opens in one. point the chain of the occupancy test of all trunk circuits. In frame 215, relay 201 disconnects wire 282 and connects wire 281 to line relay 207. Relay 210 by releasing to armature 236 short-circuits relay 208 and puts wire 151 to line. Earth; at frame 237 it opens at one point. its own blocking circuit and with the springs controlled by the armature 237 it prepares its original circuit of attraction; at frame 238 it separates the straight windings of the RC translating coil.

   Relay 304, by releasing armature 328, re-establishes the transmission circuit of the invitation to transmit tone which will be connected to. a calling line; at frame 330 it prepares at one point the circuit of relay 312 and at the springs controlled by armature 330 it prepares at one point its original circuit of attraction. The cut-off relay 22, by releasing at armatures 27 and 29 prepares the circuit of line relay 21 and at armature 29 it opens the circuit of guard relay 23. Guard relay 23 releases and to armature 31 prepares the circuit for starter wire 67. All relays have now returned to the rest position and the trunk circuit can be used for another call.



   If we assume that the line called instead of being

  <Desc / Clms Page number 42>

 busy 305 has fully drawn after sending the selection digit, from the code it is seen that the relay 505 by attracting to the armature 331 connects the busy tone of the LV wire to the calling line through armature 331, closed contact and armature 356, closed contact and armature 328, capacitor TC, wire 254, closed contact and armature 246 and loop the calling subscriber as described above. At 1 + armature 332, relay 305 prepares the earthing circuit of test wire 382, at armature 333 it opens the circuit of relays 306, 307 and 509 and prepares the circuit for attracting relay 303 in the case where the relay 207 is operated on a non-caliber basis.

   At armature 335, relay 305 prepares the circuit of relay 205 at one point and at armature 334 it closes its blocking circuit as follows; positive to guard wire 259, armature 334 and contact on, springs normally closed controlled by armature 359, winding of occupancy relay 305, negative. As soon as he. has received the busy tone the calling subscriber hangs up and thereby opens the circuit of relay 207 which releases and causes the release of the relays which have attracted as described for the release of a free line. In the present case, since the occupancy relay 305 is operated, the relay 204 by releasing, opens to the armature 221 the circuit of the occupancy relay 305 to cause its release.



   The description which has just been given relates to the operations which led to the call of subscribers such as S4 and S6 who have their ringtone connected to the positive wire of the line. Line 71 has ten grouped extensions, five of them have their ringer connected to the negative wire of the line and the others have their ringer connected to the positive wire of the line. To ring the subscribers having their ringtone connected to the positive wire of the line, the selection digit

  <Desc / Clms Page number 43>

 code is 6 or a higher digit such that the code selector relay 660 is attracted to cause the bell reversal relay 314 to be attracted as previously described.

   To ring the subscribers having their ringtone connected to the negative wire of the line, the code number transmitted is less than 6, therefore the relays 660 and 314 do not attract. In this case the attraction of the bell relay 313 operates the connection of the generator to the negative wire of the line to activate the bell. This combination is known as a split call for ten group extensions.



   Some lines can have up to twenty grouped stations, for example, lines 26 and 27 shown in fig. 4, represent an earthed line on which twenty subscribers are grouped. As can be seen, the armatures 424 and 430 of the group relay-connector 421 are connected together and connected respectively to the positive and negative line wires, 42 and 43. From the above description we can see that this line can be called by sending the digits 2 - 6 or 2 - 7.



  The first ten subscribers of this line can be called by sending the digits 2 and 6 and then one of the code selection digits 1 to 0. The sending of digits 2 and 6 by the calling subscriber operates the control relays d 'in an identical manner to that previously described and causes the attraction of the unitary connector-relay and of the group connector-relay, 421 and 406. when the calling subscriber transmits the code selection digit, the relays code selection CSR attracts as described above to select the desired code.

   Since in this case the bell reversing relay 314 is not operated, the bell relay 313 always connects the generator to the negative wire and since the relay 600 is not operated,

  <Desc / Clms Page number 44>

 by the wire selected to the resting contacts of the armatures of relay 600. The subscribers of the second group of 10 lines are called by sending the digits 2 and 7 and then one of the code selection digits 1 to 0. Sending the digits fres 2 and 7 by the calling subscriber operates the control relays in a manner identical to that described above and causes the attraction of the unitary connector-relay and of the group connector-relay, 421 and 407.

   When relay 407 pulls, its armature 414 closes the code 600 switching relay attraction circuit as follows: positive to grounded wire 279, armatures 469 and 414, wire 393, relay winding. switching of code 600, negative. The dotted line 415 indicates that the relay 600 can be operated by transmitting other group and unit selection digits if desired. The relay 600, at its idle contacts, disconnects the wires of the calling code of the first ten and to the working contacts of these armatures, it connects the wires of the calling code of the second ten.



  Sending the code selection digit activates the selection relays of. code as before to select the desired ringer code wire in the second group. Now when the buzzer relay 313 attracts the generator is connected by the wire of the selected code to the negative wire of the line. The following table gives the nomenclature of the ringing code wires selected by sending the different digits.
 EMI44.1
 



  A "t) 1) e for 2 group sets.
 EMI44.2
 
 <tb> Cipher <SEP> issued. <SEP> Wire <SEP> of <SEP> ringtone. <SEP> Figures <SEP> issued. <SEP> Son <SEP> of <SEP> ringtone.
 <tb>
 <tb>



  26 <SEP> - <SEP> 1 <SEP> 1 <SEP> 27 <SEP> - <SEP> 1 <SEP> 2 <SEP> - <SEP> 3 <SEP>
 <tb> 26 <SEP> - <SEP> 2 <SEP> 2 <SEP> 27 <SEP> - <SEP> 2 <SEP> 2 <SEP> - <SEP> 4
 <tb> 26 <SEP> - <SEP> 3 <SEP> 3 <SEP> 27 <SEP> - <SEP> 3 <SEP> 3-1
 <tb>
 
 EMI44.3
 2fiv 4 27-4 3 - 2 2fiv 1 - 1 27 - 5 3 ... 3 26 - 6 1 - 2 27 - 3 - 26 - 7 1 ... 5 bzz 4 - 1 2fui - 8 in 27 - 8 4 - 2
 EMI44.4
 
 <tb> 26 <SEP> - <SEP> 9 <SEP> 2 <SEP> - <SEP> 1 <SEP> 27 <SEP> - <SEP> 9 <SEP> 4 <SEP> - <SEP> 3
 <tb>
 
 EMI44.5
 2fi - B 2 - 2 27 - 0 z - 4

  <Desc / Clms Page number 45>

 
To give a description of the operations in the case of a communication between two stations grouped on the same line, it will be assumed that the station S wishes to call another subscriber connected to the same line, for example, the subscriber S1.

   The subscriber S who has picked up transmits the line selection digits 1 and 7 and then transmits the selection digit of the code assigned to the subscriber Si * The group searcher relays 110 and 111 and the searcher relay unit 107 attract to connect the junction circuit control relays to line 17. The group connector relay 411, the unit connector relay 407 and the code selection relays of fig. 6 also operate in an identical manner to that which has been described above.

   Since the called subscriber S1 is connected to the same line as the calling subscriber S, line 17 is marked as busy and the busy relay 305 attracts in a manner identical to that previously described. to transmit the busy tone to the calling subscriber. On receiving the busy tone, subscriber S hangs up and thereby opens the circuit of line relay 207 which releases. At armature 230, relay 207 opens the circuit of relay 303.

   Relay 303 by releasing at armature 325 opens the circuit of relay 301 and armature 324 earths test lead 382 to maintain line unoccupied and to maintain cut-off relay 2 and the slow release relay 302 in the operated position as follows: positive, armature 324 and contacts at rest, armature 332, wire 382, armature 478, armature 497, test wire 16 of line 17, armature 6 and contact at rest, branch heading towards the coil of relay 2 to keep it drawn, another branch comprising armature 9, armatures 114 and 174, wire 152, armature 222, armature 239, wire 272, coil of relay 302, negative to keep the latter attracted.

  <Desc / Clms Page number 46>

 



   The slow relay on release 301 when releasing at armature 318 and on contact opens the original circuit of attraction of relay 302 maintained attracted according to the above circuit; on the armature 318 and when the contact is at rest it closes the attraction circuit of the relay 205. This circuit is as follows: positive when the contact is at rest of the armature 324, circuit already described for maintaining the cut-off relay 2 and relay 302, wire 152, wire 271, armature 318 and contact at rest, armature 335, wire 273, winding of relay 205, negative.

   At armature 225, relay 205 opens the circuit of group 110 finder relay which releases, at armature 226 it opens one of the multiple circuits of relay 502, and at armature 227 it closes the circuit for attracting the test relay 315 as follows: Positive to normally closed springs driven by armature 228, wire 275, armature 322, wire 153, armature 227, wire 274, lower coil of relay 315, negative. Relay 110 on releasing to armatures 112 and 113 disconnects line wires 14 and 15 from junction circuit wires 150 and 151 thereby opening line relay circuit 207.

   At armature 377, relay 315 closes its blocking circuit; at armature 378 it prepares the attraction circuit of relay 670; at armature 376 it closes the attraction circuit of relay 410; at armature 375 it grounds test wire 382 to maintain the occupation of this line and at armatures 373 and 374 it prepares the ringing circuit at certain points. The attraction circuit of relay 410 is as follows: positive at armature 376 and on contact, wire 268, armature 492, winding of relay 410, negative. At armatures 495 and 496, relay 410 connects line wires 14 and 15 to junction circuit wires 252 and 255.



   At the start of the ringing code cycle the PU wire is grounded to the calling machine to cause the pull

  <Desc / Clms Page number 47>

 relay 670 as described previously. At armature 672, relay 670 closes its blocking circuit and at armature 671 it prepares the circuit for bell relay 313. When the selected code wire is earthed by the calling machine, the call relay bell 313 attracts following the circuit described above a certain number of times determined by the number of times that the selected code wire is grounded by the calling machine, to transmit the inrush current on line 17.

   The inrush circuit is as follows: generator and wire G, armature idle contact 371, work contact and armature 366, armature 573, wire 252, armatures 475 and 495, negative wire 14 of the line 17, bells connected to line 17, positive wire 15 of the line, armatures 496 and 476, wire 255, armature 374, armature 369 and contact at work, armature 372 and contact at rest, positive.



   By establishing the calling circuit and the fact that either the calling party or the called party picks up during the period of silence, relay 211 draws in series with relay 212 depending on the circuit: positive, winding of relay 212, winding - Lower right element of the RC translator coil, wire 256, contact at rest and armature 369, circuit described previously for sending the ringing current on the loop, return by armature 368 and contact at rest, wire 253, upper right winding of the RC translator coil, armature 238 and contact at rest, winding of relay 211, negative.

   In the frame 242 the relay 211 closes the attraction circuit of the relay 210 and at one point opens the circuit of the release relay 206, The relay 210 by attracting, at the armature 237 closes its circuit blocking and opens its original attracting circuit; at armature 236 it removes the short-circuit of relay 208; at armature 241 it disconnects the earth from wire 279 to release the code selection relays; at armature 238 it opens the circuit of relays 211 and 212 which release

  <Desc / Clms Page number 48>

 and at armature 239 it opens the circuit of relay 302 to cause its release. After a short time the slow release relay 302 releases, at armature 323 it opens the blocking circuit of relays 407 and 411;

   at armature 322 it opens the circuit of relays 315, 111, 107, 204 and 202.



  Relay 407 by releasing at armatures 475, 476 and 478 disconnects the wires of the junction circuit. 252, 255 and 382 of line 17. Relay 411, when releasing, opens to armature 497 the circuit of the test lead 16; at armature 492 it opens the circuit of relay 410 which releases; at reinforcements 495 and 496 it opens the circuit of wires 14 and 15 at one point.



  Relay 315, when releasing at armatures 373 and 374, opens the conversation and call circuit at other points; at frame 375 it disconnects the earth from test lead 382; at frame 376 it disconnects the earth from wire 268; at armature 377 it opens its blocking circuit at one point and at armature 378 it opens at one point the original attraction circuit of relay 670. Relay 111, releasing at armature 118 opens the circuit of relay 110 which releases, at armature 114 it disconnects the test lead from line 17 of the junction circuit. Relay 107 by releasing at armatures 172, 173 and 174 opens the junction circuit at other points.



  Relay 204 on releasing at armature 221 opens the blocking circuits of relays 210, 304 and 505. Relay 202 on releasing at armature 217 transfers relay 201 from direct earth to start wire 281. relay 205 by releasing at armature 227 opens at one point the original circuit of attraction of relay S15.



   The cutoff relay 2 when releasing, at armature 10 opens the circuit of guard relay 3, and at armatures 8 and 10 reconnects the line relay to the wires of line 17. Line relay 1. draws into the circuit of the subscriber's loop as follows: positive, armature

  <Desc / Clms Page number 49>

 10 and contact at rest, lower winding of line relay 1, wire 15, subscriber loop, wire 14, armature 8, upper winding of relay 1, negative. At armature 6, line relay 1 puts test wire 16 to earth to mark this line for occupation, on the connector side in the junction circuit and at armature 7 it closes the blocking circuit of the guard relay 3. Guard relay 3 is kept pulled to prevent grounding of starter wire 61.

   The relays 305, 210 and 304 release at this time. The relay 201 releases in the event that. wire 281 is not grounded, as previously described.



  The junction circuit is completely released and the conversation current is supplied through line relay 1 to the subscribers of line 17. After the conversation and because the two subscribers hang up the line relay 1 releases and opens the circuit of the line 17. guard relay 3 which releases and returns the line circuit to the normal position.



   It will now be assumed that the subscriber S wishes to call a subscriber connected to a remote automatic office and that he therefore sends the digits 8 and 1 to connect his line to the junction leading to this automatic office. Because subscriber S has picked up and sent the digits 8 and 1, the researchers' relays, the control relays and the connector relays have operated, - in a manner identical to that which has already been described, to establish the connection of the subscriber's line and the desired junction. In this case, since digits 8 and 1 have been sent, relays 481 and 401 are operated. At armatures 484 and 494 relays 481 and 401 connect the test lead from junction 81 to test lead 382.

   At armatures 437 and 445 relay 305 is connected in series with the upper winding of switching relay 213 to test lead 382 to determine if the junction is free or busy. In the case where. the line is occupied

  <Desc / Clms Page number 50>

 weight, the positive of the test lead 487 of the junction 81 closes the partial attraction circuit of the occupancy relay 305 to operate the armature 334 which prepares the complete attraction circuit, this is carried out when the relay 306 slackens a little after sending the pulses.

   This circuit is as follows: positive to test lead 487, armature 484 and 494, wire 382, armature 437 and 445, wire 270, switching relay top winding 213, wire 269, armature 317, resistor 341, armature 339 , winding of occupancy relay 305, negative. Due to the presence of resistor 341 in this circuit, relay 213 does not attract in the circuit described above and occupancy relay 305 only attracts its armature 334. When relay 306 releases a little after l When sending the pulses, as stated previously, this relay to armature 339 closes the entire pull circuit from occupancy relay 305 to grounded wire 259.



  The busy relay 305 attracts as already described and connects the busy tone to the calling line.



  The calling subscriber therefore hangs up and the trunk circuit returns to its normal position.



   In the case where. junction 81 is free at the time of call, there is no earth connected to test lead 487 and occupancy relay 305 is not attracting. When the relay 306 releases a little after the sending of the second pulse train, the attraction circuit of the switching relay 21S closes in series with the circuit of the cut-off relay of line 81 as follows: positive, wire 259, armature 334 and contact at rest, armature 340, armature 317, wire 269, upper coil of the switching relay 213, wire 270, armatures 445 and 437, wire 382, armatures 494 and 484, wire 487, cut-off relay associated with the junction, negative.

   On armature 250, relay 213 closes its blocking circuit via the earth taken from armature 318, armature 246 and 247 it disables.

  <Desc / Clms Page number 51>

 connects the calling line from the left windings of the translatriate coil and connects the calling line directly to wires 252 and 255. At armatures 248, relay 213 opens the circuit of relay 206 at one point; at armature 249 it disconnects the earth of wire 262 to open one of the circuits and multiple to earth of relay 301 to open the blocking circuit of relay 304.

   At frame 249 and at. contact on, relay 213 puts wire 268 to earth to close the attraction circuit, from relay 480 through armature 444 and to armature 251 it connects wire 271 grounded to test lead 382 through armatures 445 and 437 to hold test lead 382 to ground. Line relay 207 releases when its circuit is open to armatures 246 and 247; to armature 230 it opens the circuit of relay 303. Relay 480 by drawing to armatures 482 and 483 connects the wires of junction 485 and 486 to wires of junction circuit 252 and 255. Relay 303 by releasing at armature 325 opens the circuit of slow relay on release 301 which releases after a short time.

   The junction equipment operates and connects ground to test lead 487 to keep relays 213, 302 and cutoff relay 2 engaged. The blocking circuit of relay 213 is as follows: positive at wire 487, armatures 484 and 494, wire 382, armatures 437 and 445, wire 270, armatures 250 and 251, lower winding of relay 213, negative. The circuit which keeps relay 302 attracted is as follows: positive at wire 487, circuit described above, armature 251, armatures 239 and 226 in multiples, wire 272, coil of relay 303, negative. The circuit keeping the cutoff relay 2 attracted is the same as that described previously, it takes the following path: armature 251, wire 271, armature 222, wire 152, armatures 174 and 114, armature 9, winding of the cutoff relay 2, negative.

   Line wires 14 and 15 of the call

  <Desc / Clms Page number 52>

 lant are now connected directly to the junction wires 485 and 486 and the calling subscriber can therefore send the number of the desired subscriber into the automatic office to operate the switches of this office and establish communication in the well-known manner. desired. The conversation current for the calling subscriber and for the called subscriber is provided by the automatic office.



   After the conversation when the calling subscriber hangs up the switches of the automatic office return to the rest position and remove the earth from test lead 487, thereby opening the blocking circuit of relays 213, 302 and of cut-off relay 2 Relay 213 by releasing to armature 249 opens the circuit of relay 480. Cut-off relay 2 releases and opens the circuit of guard relay 3 and connects line relay 1 to the wires of line 17.



  The slow release relay 302 releases and at armature 322 opens the circuit of group 110, 111 and 107 searcher relays and of relays 204 and 202. At armature 323, relay 302 opens the circuit of relay-connectors of group 401 and 481. Relay 480, when releasing, at armatures 482 and 483 disconnects the conversation wires of the junction circuit from the wires of the junction. Guard relay 3, connector relays 110, 111 and 107 release as described above.

   Relays 204 and 202 release and the latter connects transfer relay 201 to wire 281, Relays-connectors 401 and 481 likewise release. In the event that the wire 281 is grounded the transfer relay 201 is kept attracted, otherwise the relay 201 releases and the junction circuit can be used for other calls.



   Incoming calls on the trunk cause the trunk circuit to operate in the manner previously described for establishing a call between two local subscribers.



  In this case, however, supervision by reversal

  <Desc / Clms Page number 53>

 polarity is needed and when the local subscriber answers the relay 211 pulls and armature 243 closes the circuit of the polarity reversal relay 209 to reverse the polarities of the wires of the calling junction.



   Calls to manual desks are handled as described for local calls. When hanging up, however, it is necessary to send the operator in the remote office an end signal. After the end of the conversation on such a junction, the calling subscriber hangs up and releases relay 207. At armature 230, relay 207 opens the circuit of relay 303 which releases and at armature 327 it disconnects the negative. of the rewinding of the relay 211 of the negative wire 252 which removes the negative of the wire from the junction, the operator at the remote office therefore receives a disconnection signal.

   Relay 211 by releasing at armature 243 opens the circuit of relay 209 which releases if it has drawn and at armature 242 closes the blocking circuit of slow relay on release 301 before the latter releases. as a result of releasing relay 303.



  This circuit is as follows: positive, armature 321, wire 265, armature 242 and contact at rest, armature 245 and contact on, wire 264, winding of relay 301, negative. Restoring the junction circuit is now controlled by the attendant via the junction. When the operator at the remote office disconnects the circuit of relay 212 opens and this relay releases, thereby opening the circuit of relay 301 to armature 245 and causing relay 301 to release and reset. in the normal position of the junction circuit as described above.



   The trunk circuit is considered to be maintained by a permanent loop if it remains blocked, while no communication is established, for a minimum of two minutes after it has been seized or after the called subscriber.

  <Desc / Clms Page number 54>

 has hung up. The relays 580 and 590 and the switch 593 of fig. 5 provide a timing device that causes the release relay 206 to pull out if a fault, such as a permanent loop, occurs. After an interval of two minutes the contacts 593 close to establish the circuit of the relay 590. At the armature 592 the relay 590 disconnects the earth of the wire 284 and at the working contacts of the armature 592 closes the attraction circuit of the relay 580.

   At armature 581 relay 580 prepares the circuit connecting a negative to wire 285 to attract release relay 206 if a permanent loop exists. When the switch springs 593 open relay 590 releases and armature 591 momentarily connects a negative to wire 285 to attract release relay 206 if a permanent loop exists.



  To frame 592 and to. contact on contact relay 590 opens the circuit of relay 580 which releases after a certain time and on contact at rest of the armature 592 puts wire 284 to earth. Relay 580 when releasing at armature 581 disconnects negative from wire 285.



   In the case where the junction circuit is maintained by a permanent loop while it is not in the conversation position and that is to say if the relays 211, 212 or 213 are not attracted, the attraction circuit of the release relay - ration 206 closes when relay 580 attracts and when relay 590 releases, as follows: positive to armature 321, wire 265, armatures 242, 245 and 248 and their contacts at rest, winding of release relay 206 , normally closed springs controlled by frame 229, wire 285, frame 581 and 591, resistor 594, negative.

   Relay 206 to armature 228 disconnects the earth of the normally closed springs controlled by armature 228 and connects this to wire 284 coming from the idle contact of armature 592 and terminating at wire 275 to maintain guard. on wire 275 until

  <Desc / Clms Page number 55>

 that relay 590 is operating again. At armature 229, relay 206 opens its original attraction circuit at one point and closes its blocking circuit at wire 286.

   Now in the event that the junction circuit has not moved into the talk position as a result of any of the relays 211, 212 or 213 being pulled in before the relay 590 then pulls in again, the relay 590 to armature 592 disconnects the earth from ground wire 275, which has the effect of freeing the junction circuit and blocking the calling line. In the event that a subscriber fails to transmit or, if the line is maintained by a short circuit, the disconnection of the earth from wire 284 to armature 592 opens the circuit of searcher relays such as 110, 111 and 107 and junction circuit control relays 202 and 204.

   Releasing the searcher relays disconnects the calling line from the junction circuit, which releases the line relay 207 and the cut-off relay 2. At armature 230, relay 207 opens the circuit of relay 303 which releases and at the armature 325 this opens the circuit of the slow relay on release 301 which releases, at the armature 318 it opens the circuit of the relay 302. The relay 502 releases and causes the release of the relays which are still attracted, of in the manner which has been described previously.



   In the event that the calling subscriber sends only a single digit and does not hang up, the elimination of the earth on wire 284 causes the release of the junction circuit exactly as we have just said and moreover, in this In this case, as the relay 511 has drawn it is released following the release of the relay 204 which at the armature 221 opens the circuit of this relay. The group relay connector which has drawn is released by removing the earth at ground wire 278 by releasing relay 302. In the event that the subscriber issues two digits and does not hang up, remove it.

  <Desc / Clms Page number 56>

 Earth to wire 284 causes the release as described above and furthermore causes the release of the relays-connectors, which have operated :, following the release of relay 302.



   In the event that the called subscriber does not answer within the determined limits, the removal of the earth at wire 284 causes the relays to be released as already described and furthermore the release of relay 315. At armature 576, relay 315 opens. the group relay-connector circuit, at armatures 373 and 374 it disconnects the generator from the called line, at armature 378 it opens the circuit of relay 670; at armature 375 it disconnects the earth of the test lead to free the called line. Relay 302 by releasing to armature 325 opens the blocking circuit of the operated relays-connectors and of the code selection relays which have drawn. When releasing relay 670, armature 671 opens the ringing relay circuit 313.

   The connector relays that attracted release to disconnect the called line from the junction circuit and the code select relays release which returns the junction circuit to the normal position.



   In the case where. the calling subscriber does not hang up when the called party has just done so the removal of ground at wire 284 causes the relays to be released as described previously, and in this case the relay 210 releases following the release of the relay 204 when the blocking circuit of the relay 210 is open at the armature 221. In an identical manner, when the calling subscriber neglects to hang up after having received the busy tone the trunk circuit releases as already described and the relay 204 to armature 221 opens the circuit of occupancy relay 305 and relay 304 which release.



   In the case of a call between two grouped extensions

  <Desc / Clms Page number 57>

 on the same line if calling back and the called party neglects to answer, the removal of the earth at wire 284 causes the release of relays 110, 111, 107, 202, 204 and 315 as described previously. Releasing relays 111 and 107 cuts off the test leads that kept relays 302 and 205 attracted. Relays 304, 305, 502, 205, 670, 411, 410 and 407 and the code selection relays that were. attracted release as described above, to make the junction circuit free.



   When the earth is removed from the test lead the cutoff relay, such as relay 2, releases and at armatures 8 and 10 reconnect line relay 1 to the line wires to cause it to be re-drawn in the event of a permanent loop.



  On armature 10, relay 2 opens the circuit of guard relay 3. Line relay 1 immediately re-attracts in the event of a permanent loop and at armature 7 it blocks guard relay 3 in the operated position before he did not have time to relax. At armature 6, relay 1 puts wire 16 to the earth to mark the line for occupation. When the permanent loop disappears, the circuit of the line relay 1 opens and this relay releases to release the line to the armature 6, at the armature 7 it opens the blocking circuit of the guard relay 3 which releases. The line circuit is now in normal condition and can be used for both incoming and outgoing calls.



   In the event that the unitary searcher relays do not find the calling line, relay 107 to armature 148 closes the attraction circuit of relay 202 as follows: positive to wire 153, armature 223 and contact at rest, armature ture 220 and contact at work, wire 155, armatures 142, 145 and similar armatures of unit researcher relays,

  <Desc / Clms Page number 58>

 Lower of relay 202, negative. At armature 217, relay 202 closes the attraction circuit of transfer relay 201.

   The relay 201 to the armature 216 closes the occupancy test chain of all the junction circuits at one point; at armature 214 it closes its blocking circuit; to armature 215 and its contact at work it connects wire 281 to wire 282 to start the following free junction circuit in search of the calling line, and to armature 215 and at idle contact it opens the circuit line relay 207. Releasing line relay 207 releases the junction circuit as previously described.



   When all junction circuits are busy, the all junction circuit 500 busy relay pull circuit closes as follows: positive at terminal 573, wires identical to wires 283 and 280, terminal 574, of identically via wires from terminal 575 to terminal 576, from terminal 577 to terminal 578 and wire 283, armature-216, wire 280, occupancy relay winding of all junction circuits 500. A the armature 501 the relay 500 removes the earth from the starting circuit to prevent a pending call from keeping the transfer relay 201 operated. As soon as one. junction circuit becomes free, relay 500 releases.



   If the starter relay circuit 510 remains closed for a determined time, the earth to the springs 503 operated by the time switch TS closes the circuit of the relay 560. The relay 560 to the armature 561 prepares the circuit of the relay 570 and of the starter lamp ST, in frame 562 it closes its blocking circuit through the intermediary of armatures 541, 512 and 501; at armature 563 it opens its original circuit of attraction at one point; to armature 564 it prepares the circuit of relay 540 and to armature 565

  <Desc / Clms Page number 59>

 it prepares the circuit of the alarm lamp AL and opens the circuit of the relay 550 at one point.

   When the time switch TS closes the springs 502 the attraction circuit. relay 540 closes as follows: positive to springs 502, armature 564, normally closed springs controlled by armature 542, winding of relay 540, negative. At armature 541, relay 540 opens the blocking circuit of relay 560 which releases; at armature 542 it closes its blocking circuit; at armature 543 it opens the circuit of relay 530 if the latter has attracted, and at armature 544 it opens the circuit of relay 520 and removes the short-circuit of relay 530 if relay 520 has attracted. Relay 560 by releasing at armature 565 closes the attraction circuit of relay 550, at armature 563 it closes at one point its original attraction circuit.

   If relay 520 is pulled at this time, relay 530 pulls in series with relay 520 since the short of relay 530 is removed at armature 544.



  At armature 531, relay 530 transfers the starter wire to the middle of the chain to select the next free junction circuit in the middle of that chain. If the relay 530 is already operated it releases at this time following the operation of the armature 543 because its circuit is open at this point. Relay 530 on releasing transfers the middle start circuit to the start of the chain. The attraction circuit of relay 550 is as follows: positive to armature 545, armature 565 and contact at rest, springs normally closed controlled by armature 553, winding of relay 550, negative.

   At armature 553, relay 550 terminates its blocking circuit and opens its original attraction circuit; at armature 552 it prepares the blocking circuit of relay 560; at armature 551 it prepares the circuit of the starter lamp ST and at armature 554 it prepares the circuit
 EMI59.1
 bzz - 4 ---- a, 9,. ,, ", p oT.¯ When the switch in time

  <Desc / Clms Page number 60>

 TS closes the springs 503 again, the relay 560 attracts again To the armature 562 the relay 560 closes its blocking circuit; at armature 561 it closes the circuit for igniting the starter lamp ST and attracting relay 570; at armature 565 it closes the ignition circuit of the alarm lamp AL (or any other alarm device).



    A. Armature 572 Relay 570 closes the AL alarm lamp multiple circuit. When the starter relay circuit 510 is open, this relay releases and its armature 511 removes the earth from the starter circuit; at armature 512 it opens the blocking circuit of relays 540, 550 and 560 and to another armature (not shown it opens the circuit of the switch in time TS to stop it. Relay 540 by releasing at armature 545 opens one of the multiple circuits of alarm lamp AL Relay 560 by releasing at armature 561 opens the circuit of starter lamp ST and relay 570.

   Releasing relay 550, at armature 551 opens at one point the circuit of starter lamp ST and of relay 570; and at armature 554 it opens the circuit of the lamp AL. Relay 570 by releasing to armature 572 opens the alarm lamp AL circuit. From the above it can therefore be seen that if the start relay 510 is kept attracted for a determined time, which in this case will indicate that a fault has occurred, the time switch TS which starts when the relay 510 attracts, will have sufficient time to cause the operation as just described. The operation of the switch in time is slow enough to avoid sending an alarm under normal conditions.


    

Claims (1)

1. An electrical pulse repeater device comprising a relay which acts under the action of the pulses which it receives from an incoming circuit and a relay designed to transmit the corresponding pulses under the control of a third relay whose circuit is jointly controlled by the first and second relays. 2. An electrical pulse repeater device comprising a pulse relay for transmitting pulses to a pulse transmitting relay intended to be put into service under the action of a pulse and to be released under the pressure. action of the next pulse in which the pulse relay circuit is controlled by the pulse repeater relay so that the transmission of each pulse can only take place if the previous pulse has been repeated. 3. A telephone system or the like comprising a group of selection relays intended to be controlled by means of an odd pulse wire and an even pulse wire by a pulse repeater relay such that the second selection relay is energized through the even pulse wire under the action of the second repeated pulse and the third selector relay is energized through - the odd pulse wire under the action of the repeated third pulse, the other selection relays being activated in a similar manner. 4. A telephone system in which the call of a called subscriber on a grouped line is controlled by the last digit sent of the number of the called subscriber, the preceding digits being used to select the line in question , the state of the line - free or busy - being tested on receipt of the first pulse of the CLAIMS. <Desc / Clms Page number 62> 5. A telephone system in which the same line is selected by sending one or the other of two different group selection digits and the same ones digit and in which by sending one code selection digit one or two different ringing codes are transmitted depending on the value of the group digit transmitted. 6. A telephone system comprising a group of pulse counter relays arranged to select, under the action of a ringing code digit, a particular code depending on the latter and comprising a ringing relay designed to connect, according to the code selected, a source of inrush current to a selected line; said current source being connected either to the positive wire or to the negative wire of the line following the value of the preceding figure. 7. A telephone system comprising a group of pulse counter relays intended to be operated under the action of a digit sent by a calling subscriber to select a particular ringing code in which the source of calling current is connected to a determined wire of the line conductors in the case where this figure has a determined value or is less than it and is connected to the other wire of the line in the case where the figure is greater than this value. 8. A telephone system in which the same line is selected by sending one or the other of two different unit digits and the same group selection digit and in which by sending the same code selection digit Different ringer codes are transmitted depending on the value of the ones digit. 9. A telephone system comprising several groups of lines and two groups of relays common to them. <Desc / Clms Page number 63> provided to select the calling line when a call is made from any one of these lines, in which a relay in one group is operated to mark the calling line in the second group of relays which then operate in sequence to search for the line in question. 10. A telephone system comprising several groups of lines and a group of relays common to them in which when a call is made said relays operate in sequence until the calling group has been found. 11. A telephone system comprising a trunk circuit having access to several groups of lines and including group relays and unit relays in which when a line is on call or is called a group relay is. operated to connect the test lead of this line to the junction circuit; a second group relay being subsequently operated to connect the talk wires to the junction circuit when The state of the line - calling or free - has been verified in the trunk circuit. 12. A telephone system or the like comprising a group of selection relays in which the attracting circuit of the first relay comprises the rest contact of all the relays in series, the attracting circuit of the second relay comprises a work contact of the first relay, the circuit of the third relay comprises an idle contact of the first relay and a working contact of the second summer, the attraction circuit being therefore transferred automatically from one relay to the next to cause the relays to operate in sequence. 13. A telephone system comprising several circuits <Desc / Clms Page number 64> rents relay corresponding to different groups of lines in which at the time of the emission of a call a call polarity is connected to contacts of the relay which in each junction circuit, corresponds to the group in which the calling line is located . 14. A telephony system comprising a trunk circuit to which the calling line test lead only is connected to the trunk circuit when a call is made, the talk leads being subsequently connected. to the junction circuit after a test has been performed through the test lead. 15. A telephone system in which a trunk circuit seized at the time of making a call comprises relays provided to search for the calling line and a transfer relay provided to transfer the call to another circuit. junction in the event that said relays cannot find the calling line. 16. A telephone system comprising several searchers intended to be distributed in service by means of an air-chain in which a starting circuit ends at the start of the chain circuit and a second starting circuit ends at the start of the chain circuit. in the middle of the chain circuit, so subsequent calls activate free seekers via the first starting circuit and the start of the chain circuit while interfering calls activate free seekers via the chain circuit. 'intermediate of the second starting circuit and the middle of the chain circuit. 17. A telephone system comprising a trunk circuit having access to several groups of lines by means of a pair of conversation wires and a test wire and comprising relays, some of which are <Desc / Clms Page number 65> are intended to operate when a line is calling or is about to be called to connect the test lead to the junction circuit while another relay is operated later to connect the conversation wires when the line state - calling or free - has been checked in the line circuit. 18. A telephone system comprising a trunk circuit having a pair of incoming talk leads and an incoming test lead and a group of relays which, when a call is made, connect the test leads of the telephone. a group of lines, in sequence, to the incoming test wire until the calling line is found, at this point another relay operates and connects the call wires of the calling line to the incoming conversation wires of the junction circuit. 19. A telephony system comprising trunk circuits consisting only of relays intended for the establishment of local communications between subscriber lines and connections between inter-urban junctions and subscriber lines in in which the conversation current is supplied by the trunk circuit for local communications, while in the case of interurban communications the speech current is supplied to the local subscriber by the inter-city trunk, the current source of the junction circuit being disconnected. 20. A telephony system as claimed in or independently of claim 18 comprising a junction circuit having a pair of talk outgoing leads and a test outgoing lead and a group of relays some of which operate below. action of the pulses emitted to connect the outgoing test lead to the EMI65.1 -) - <-.-) - Ae te '1-0 ........, ...... 5¯. t ... ¯nā ---.-- -. ... <Desc / Clms Page number 66> operates in the case where the called line is free to connect the outgoing conversation threads to the conversation threads of the called line. 21. An electrical pulse repeater device as claimed in claim 1 wherein the first relay is driven through a line having low insulation resistance and is adjusted to be able to quickly release on opening. of its attraction circuit. 22. An electrical pulse repeater device as claimed in claim 1 or 21 in which a pre-energizing circuit is given to the first relay when it releases to assist it at the time of the subsequent attraction. 23. An electrical pulse repeater device as claimed in claim 1 wherein the third relay is provided with a blocking circuit controlled by the first relay independently of the second. 24. An electrical pulse repeater device as claimed in claim 1 or 2 wherein the second relay transmits a pulse on one pulse outgoing wire as it attracts and transmits a pulse on another outgoing wire. momentum when it releases. 25. An electrical pulse repeater device as claimed in claim 5 comprising a line relay which follows the pulses received on the line to which it is associated and is provided to effect, under their action, the release of the pulse relay. and which works in conjunction with the pulse repeater relay to operate the reallocation of the pulse relay. 26. A telephone system or the like as claimed in claim 3 comprising a pulse relay which releases on each pulse and controls the pulse repeater relay such that the pulse repeater relay <Desc / Clms Page number 67> pulse attracts under the action of the first pulse and subsequent odd pulses and releases under the action of the second pulse and subsequent even pulses. 27. A telephone system or the like as claimed in claim 3 or 6 in which each selector relay closes its blocking circuit upon attraction and opens the blocking circuit of the previous selector relay to cause its release, 28. A telephony system comprising an electrical pulse repeater device as claimed in claim 1 in which the first relay releases intermittently under the action of pulses transmitted over a calling line while that the second relay attracts under the action of each alternate release of the line relay and releases under the action of each other alternate release of the line relay. 29. A telephone system as claimed in claim 5 in which the ring code is transmitted on the positive wire or the negative wire depending on the value of the transmitted code digit. 30. A telephone system as claimed in claim 5 in which the particular ring code which is transmitted is jointly determined by the group digit, the ones digit and the code select digit. 31. A telephony system as claimed in claim 9 in which each of the relays (group relays) of the first group corresponds to a different group of lines and by drawing connects the test leads of the corresponding groups of lines to the same. second group of relays (single relays). EMI67.1 IZ.3 TT- - + am + a + .61pnnnnie as claimed in the claim <Desc / Clms Page number 68> tion 11 in which the first group relay connects the test leads of all the lines of the group corresponding to a group of unit relays which operate in sequence to select said line when it calls. 33. A telephony system as claimed in claim 12 in which the second relay and each of the following relays close their blocking circuit when they engage and open the blocking circuit of the previous relay. 34. A telephony system as claimed in claims 11, 13 or 32 in which at the time a call is made the group relays operate in sequence to find the calling group after which a group test relay operates to. prevent any subsequent operation of these relays. 35. A telephony system as claimed in claim 10 in which the relays of a second group sequentially search for the calling line when the group in which it is located has been found. 36. A telephony system as claimed in claim 32 in which a line test relay operates when the calling line is found to prevent further operation of the unit relays. 37. A telephony system as claimed in claim 14 in which the test lead is connected to the junction circuit by a relay which operates when the junction circuit is turned on while the talk leads are connected. to the junction circuit by a relay intended to operate after a test has been carried out by means of the test lead. 38. A telephony system as claimed in claim 9 in which, only, the test leads of the group <Desc / Clms Page number 69> calling party are extended initially to the second group of relays, the conversation threads being subsequently extended when the calling line is found. 39. A telephony system as claimed in claim 34 in which the operation of the group test relay causes the operation of a second group of relays, in sequence, to find the calling line after which a relay line test operates to prevent further operation of the second group of relays. 40. A telephony system as claimed in claim 16 in which a transfer relay is provided to transfer the starting circuit to the next trunk circuit, this relay being held attracted during a call and released at the start. end of communication if the starter circuit is not in service at this time due to a call being made. 41. A telephony system as claimed in claim 40 in which a relay, drawn when all trunk circuits are busy, is provided to prevent the starting circuit from allowing the release of transfer relays. 42. A telephony system as claimed in claim 15 or 16 in which provision has been made for the release of a junction circuit brought into use in the event that the latter does not go into the conversation position in one step. determined, after it has: been entered. 43. A telephony system as claimed in claims 9, 10, 11 or 13 in which the possibility of reversing the direction of the current in the calling line under the control of contacts of certain group relays corresponding to the groups of lines is provided. which require the reverse polarity for supervision. <Desc / Clms Page number 70> tion 11 in which the first group of relays connects the test leads of all the lines of the group corresponding to a group of unit relays, one of which operates according to the units digit of the number of the line called to operate the selection of the wires leading to this line. 45. A telephony system as claimed in claim 20 in which the test lead of the called line is connected to a busy relay in the trunk circuit, which relay is intended to be operated and transmitted. the busy signal to the calling subscriber if the called line is busy. 46. A telephone system as claimed in claim 20 or 45 in which a relay is provided which operates in the event that the calling subscriber and the called subscriber are connected to the same line, to connect the connection wires. outgoing conversation to the conversation threads of that line. 47. A telephony system in principle as described above with reference to the attached plans.,