BE422189A - - Google Patents

Description

       

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  Improvements to telephone systems.



   The present invention relates in general to automatic telephony systems, it relates more particularly to small systems suitable for telephone installations in small towns or villages.



  An automatic system of this kind is generally known as a C.A.X. automatic desk, it can have a capacity of about 50 lines. Usually the lines are grouped stations having calling circuits bridged on the line or connected to the ground allowing these subscribers to ring by means of a calling code. Provision has also been made for the possibility of establishing inbound and outbound long distance calls with remote offices. The object of this in-

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 vention is to provide an automatic C.A.X. all new and improved relay.



   One of the features of the invention relates to the all-semi-directional relay finder having improved test circuits allowing the searcher relays to test two lines simultaneously in the calling group.



   Another characteristic relates to an improved test circuit making it possible to use the relay groups of the connectors for the test of one or two lines in the called group depending on the units digit which has been transmitted.



   Another feature relates to an improved subscriber line circuit provided with a magnetic shunt line relay and a latch relay.



   An additional characteristic relates to a locking possibility which becomes active in the event that the searcher does not find the special polarity connected to the calling line, following the opening of a marking circuit, the other connection circuits being prevented from connecting to this line as long as the circuit is in the call position.



   These charac teristics and others will emerge from the detailed description of the invention which will be given below.



   Referring now to the plans, comprising figs. 1 to 8 inclusive, it can be seen that a sufficient part of the apparatus used in an automatic telephone system has been shown by means of the usual schematic circuits to enable the invention to be understood immediately.



   Fig. 1 represents the group of FGR group finder relays which connects the line and test wires of the various groups of lines and junctions to one of the

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 all-relay connection circuits. The lines are divided into five groups of 10 lines each, they are called group
20, 30, 40, 50 or 60.



   Fig. 2 shows the group of relays of the individual researcher FUR which makes the connection of the line of any group to the control circuits of the connection circuit.



   Fig. 3 shows the relay group of the individual connector CUR which makes the connection of the connection circuit to any particular called line in any called group as determined by the group connector relay which operated.



   Fig. 4 shows the group of relays of the CGR group connector which make the connection from the outgoing end of the connection circuit to any line of any group.



   Fig. 5 shows an all-relay distributor which performs the preselection of the free connection circuit.



   Fig. 6 shows a relay group of the connection circuit control circuit.



   Fig. 7 shows another group of control circuit relays on the same line.



   Fig. 8 represents another group of relays of the same connection circuit which includes relays for checking the transmitted digits.



   Referring now to the plans mentioned above, it will be assumed that one of the subscribers connected to line 21 is making a call. When the subscriber picks up his receiver, the magnetic shunt relay 70 draws in the following circuit: positive through the left winding of the relay 70, 63, loop of the calling line, 62, right winding, negative. Relay 70 attracts only if the line wires are shorted, it does not attract in the event that either or both of the line wires are grounded. When the relay 70 attracts, in 71,

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 it connects the marking polarity, which comes from the negative, through the coil of relay 60 to contact 119 of relay 122 of the group finder.

   At its working contact 72, the relay 7C connects a direct earth to the wire 56 to mark this line at occupation, at 73 it places the common starting wire 90 to the earth to cause the attraction of the relay 552 of FIG. 5.



   When relay 552 attracts it establishes, in 577, the excitation circuit of relay 551 through contact 545, in 578 it establishes its own blocking circuit on wire 90, at contacts 579 to 582 inclusive it opens the circuits of the other starting relays of the remaining groups to prevent their operation. When relay 551 attracts, it opens at one point, at 545, the original excitation circuit of relay 552, which now remains attracted in its own blocking circuit, at contacts 546 to 549 inclusive, it opens at other points the starter relay circuits of the remaining groups to prevent them from operating in the event that a line in another group makes a call.

   In 560 relay 551 maintains relay 59: attracted, in 561 it completes the excitation circuit of relay 170, in 570 it causes relay 597 to attract in the circuit going from positive in 570 to the negative through contact 575 through the winding of relay 597. When relay 597 operates it attracts its weighted armature 598 which connects a ground to contact 570 through contacts 598 and 599 and the winding of the delay 596 to end up with the negative. Relay 596 attracts and in 569 closes the circuit of relay 595. After a short moment, relay 595 attracts and in 559 bypasses contact 569, in 576 it closes on contact 570 grounded the excitation circuit of relay 593, which when 'it attracts in 575 the original circuit of excitation of relay 597.

   Relay 597 releases

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 therefore and releases its weighted armature 598 which vibrates between its two contacts, the contact 559 being open. Relay 596 releases when its circuit is opened at 599, but relay 595, because it is delayed on release, remains attracted as long as the vibrations of the weighted armature 598 are of sufficient amplitude for the contacts of closure are established.



   Relay 170 draws in the following circuit: positive, contacts 589, 588, 561, 574, 507, wire 191, winding of relay 170, negative. At contact 116, relay 170 disconnects wire 185 from wire 184, at 172 it draws relay 122, at contacts 172 to 176 inclusive it prepares circuits for other relays of the group finder, at contact 129 it establishes relay circuit 558 in series with relay 630.



   When relay 122 attracts, at its upper contacts it switches on the test leads of all lines of group 20. Relay 630 draws in series with relay 558 as follows: positive, winding of relay 630, 182, 129, 181, winding of relay 558, negative. In 584 the relay 558 establishes the search circuit for the relays of the individual seeker and causes the relay 210 to be attracted.



   When relay 630 attracts, at 631 it establishes the excitation circuit of relay 620 as follows: positive at 722, 717, 627, 'normally closed contacts controlled by spring 682, 626, 631, winding of relay 620, negative. On contact at work 632, relay 630 closes the excitation circuit of the. relay 680 as follows: positive, 722, 629, 632, coil of relay 680, negative. At 621, relay 620 closes the circuit which borrows contacts 794, 741 and 734 in multiples, the winding of relay 720 and the negative.



   When relay 680 attracts, in 681 it establishes the circuit

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 blocking of relay 620, in 682 it opens the initial circuit. excitation of relay 620, finally in 683 it closes its own blocking circuit through resistor R1 independently of contact 722.



   Relay 720 attracts and contact 721 establishes another circuit; blocking relay 620, 'in 722 it opens the initial excitation circuit of relays 680 and 620, in 723 it connects a direct earth, taken to the normally closed springs controlled by contact 305, to wires 754, 295, 188 and 388, it also closes the circuit of relay 710. In '724, relay 720 disconnects one of the multiple earths of wire 669, at the working contacts of this one it puts ground wire 185 to maintain a positive on wire 184 when relay 170 releases, in 725 it
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 ± <= i ': 1 the CO.:4 '11. t; : 1¯1.1 '3Gô relays.



  The excitation circuit for relay 710 is as follows:: 1 34'j liis 2 earth, contncts 725, 755, Se5, 694, 647, 777, 7jL., Enr ') u ::' C: l.! ent of relay 710, resistance R2, negative. ijn 716 1 ;; 1) 31: 1¯: 711 turns on the tone generator machine,: - c.,: 1'in jr. ' clear of [: '1 1: J., on contact 719 it completes 0,)' 1 own blocking circuit. This blocking circuit borrows, c,) "ù: -0 :: ':' - 1 excitation circuit, contacts 6fez'7, 878, 756 and 719.



  The excitation circuit of relay G08 is as follows: f'-l i. l. 'L #i => i, i 1 r 1 <> 1 1 i' î ', put s F .. 11 earth, rcssorbs normally-, closed c:.: Itrôl> 1 ± by contacts .5Q9, 654, , 753, 725, 649, ink coil of relay 608, negative. In 605, relay 608 connects the cut-off wire at time T.C.0, earthed to wire 545 instead of a direct earth, in 606 it sets wire 185 to 1 ?. earth, in 307 L, opens at another point the earthing circuit of wire 66C, in 60S it establishes its blocking circuit), 2i) #, ') ai1 locking wire in time l', L, through the circuit described above.



   The relay 210 attracts as a result of the operation of the

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   relay 558, as follows: positive taken on contact 584, 587, 199,
179, 292, 271, 261, resistor R, 251, 241, 231, 221 and 211, winding of relay 210, negative. The relay 210 closes its contact 212 first and locks itself to the grounded wire 188, in 217 it prepares the test circuit of the sixth line of the calling group, in 216 it prepares the test circuit of the first line of the calling group, to contacts
214 and 215 it prepares the line connections either for line 21 or for line 26, at contact 211 it opens its initial circuit. excitation, on contact at work 211 it completes the excitation circuit of relay 220.



   If the calling line is neither line 21 nor line
26, relay 220 draws after a certain time in the circuit which has been described for relay 210. At contact 222, the relay
220 is blocked by means of the wire 188 which is grounded,
229 it prepares the test circuit of line 27 of the calling group, in 228 it prepares the test circuit of line 22 of the calling group, to contacts 226 and 227 it prepares the connection of lines 22 and 27 of the called group , in 224 and 225 it opens the test circuit of the first and sixth lines of the calling group, in 223 it opens the blocking circuit of relay 210, in 221 it opens its initial excitation circuit, on contact at work 221 it closes the relay circuit 230.



   Relays 230 to 250 inclusive, operate in sequence as described above until the called line is found or until relay 260 draws in the event that the connection circuit does not find. the calling line.



   If the connection circuit does not find the calling line, the relay 260 attracts under the action of the relay 250. In 262 the relay 260 locks on the wire 188 earthed, in 264 and 265 it opens the test leads of the fifth. and tenth lines of the calling group, in 266 it opens the circuit of relay 210, in

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   235 it opens the blocking circuit of relay 250, when the contact is at rest 281 it opens the search circuit going towards the relays of the individual researcher, when the contact is at work 261 it closes the excitation circuit of relay 89 of group 20 which It follows the excitation circuit of the relays of the individual finder up to contact 261 and then contacts 288, 572, CI-] the winding of relay 89 and the negative.

   At 80, 81, 82 and similar contacts, relay 89 completes the excitation circuits of relays such as relay 20 of junction @ 20, relay 50 of line 21 and similar relays of the remaining line circuits of the group 20. At contact 21, relay 20 opens the circuit of relay 30 to prevent a call appearing on this junction circuit from marking contact 110 with a call polarity, at 22 it grounds wire 99 d permanent alarm to trigger an alarm. Relay 50, at contact 51, disconnects the inrush polarity of the contact.



    It ±, at 52 it also earths the permanent alarm wire 99, at contact 53 it disconnects the earth from wire 90 to cause the release of relay 552 of fig. 5, on contact to work 53 it closes its contact blocking circuit 73 as long as the relay 70 remains attracted.



   Relay 552 releases and in 562 opens the initial circuit of excitation of relay 122 which remains attracted by the intermediary of wire 188. In 572 the relay 552 opens the circuit of relay 89 and in 577 i opens the circuit of relay 551 At contact 80, relay 89 opens the circuit of relay 20 which releases and in a manner identical to its other contacts release the latching relays in all line circuits of group 20 provided that the line relays of these circuits do not. -are not attracted. On contact 81, relay 89 opens the initial circuit for energizing relay 50, but this relay is blocked for the moment because relay 70 is attracted.



  Therefore, as long as the relay 70 remains attracted to the

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 relay 50 also remains attracted to remove the call polarity to contact 119. In 561, relay 551 opens the circuit of relay 170 and in 570 it opens the circuit of relays 593 and 595,
When relay 170 releases, at contacts 116 it connects wire 185 grounded to wire 184 to draw relay 502 in series with relay 594 to preselect the next free connection circuit, to contacts 172 to 176 inclusive. , he opens the circuit of the relays of the group researchers, in 179 he opens the search circuit leading to the relays of the individual researchers, finally in 129 he opens the circuit of the relays 558 and 630.



   When relay 630 releases, at contact 632 it opens the circuit of relay 680 and in 631 it opens one of the circuits supplying relay 620. When relay 680 releases, when its circuit opens, in 681 it opens the second circuit relay 620 which therefore releases after a short time. Relay 620, at 621, disconnects the earth of wire 293 and releases relay 720. Shortly after its circuit has been opened, relay 720 releases, at contact 723 it disconnects the earth of wires 754, 388, 188 and 295 for cause the relays 122, 260 and 710 to be released and to return the connection circuit to the rest position.



   Relay 502 draws in series with the top winding of relay 594, as a result of releasing relay 170, and in the following circuit: positive at 606, before relay 608 releases, 185, 116, 184, 510, winding upper relay 502, upper relay winding 594, negative. When the relay 502 attracts, at 513, it closes the starting circuit to the connection relay of the second connection circuit if the latter is free, at 516 it closes the circuit of the third selection relay 503. of the connection circuit if the second connection circuit is occupied, in 517 it blocks in series with the relay 591, in 518 it opens the

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 blocking of relay 501. Relay 594 pulls in series with relay 502 and releases when relay 608 releases or when relay 501 releases.

   Relays 593 and 595 release shortly after releasing relay 551. So the connection circuit is released, the line? 21 is blocked out of service as long as the line relay 70 is attracted and until the distributor has selected the next free connection circuit.



   Referring now to the operation of the individual finder relays and since line 21 is the calling line, when relay 210 draws, at contact 216, it sets up the supply test circuit of relay 60 of the calling line, in series with relay 557, as follows: posi- ti, contact 583, upper winding of relay 557, 198, 178, 294, 275, 285, 284, 216, 281, 119, 51,71, winding of relay60, negative. At contact 585, relay 557 operates relay 120 through contacts 585, 197, 177, 296, 274, 266, 190, 123 and through the winding of relay 120 and the negative.

   At contact 586, relay 557 keeps relay 551 attracted, at working contact 587 it is blocked by means of the earth taken by spring 584. At idle contact 537, relay 557 opens the search circuit before the relay of the next researcher, in this case the second, was able to draw fully.



   When relay 60 attracts, at 61 it blocks itself independently of contacts 51 and 71, at 62 and 65 it disconnects relay 70 and at contact 64 it operates relay 50. Relay 50, at 51, opens the relay. initial circuit for energizing relay 50, at 52 it prepares the alarm circuit at one point, at 53 it opens the starting circuit and releases relay 552 if no other line in the group is calling at the moment. Relay 70 releases following the operation of relay 60, at contact 72 it disconnects the

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 direct earth of wire 56 and connect the earth taken to the lead circuit to keep this line on the connector side in the lead circuit.



   When relay 120 attracts, at 117 and 118, it connects the line wires to the connection circuit wires which keeps relay 630 drawn into the subscriber loop, as follows: calling subscriber loop through through contacts 117 and 118, 282 and 283, 215 and 214, 286 and 287, 792 and 793, 617 and 618, 711, RC resistance, negative through relay 610 and contact 602, contacts 601 and relay 650, positive. The invitation tone to transmit is transmitted to the calling subscriber from the source DT, through the contacts 881, 871, 748, 712, through the tone capacitor TC, to 618 and from there in the circuit described above.

   At 126, relay 120 also pulls relay 502 in series with relay 594 to preselect the next free connection circuit.



   In order to describe more fully the simultaneous test of two lines in a group, it will be assumed that when relay 210 attracts line N 26 is calling instead of line N 21. In this case the relay 270 is supplied in series with the calling line cut-off relay as follows: positive taken from 293 grounded wire, lower coil of relay 270, contacts 291, 139, 284,225, 217, 280, 116, calling line 26 test lead, associated latch relay normally closed contacts, line relay closed contacts, line 26 cutoff relay winding, negative.



  At contact 272, relay 270 is blocked in 188, at contact 276 it connects wire 293 to the winding of the cut-off relay of line 26, at 275 it opens the test circuit of relay 557 at one point, at 274 it opens the circuit of relay 120 of the group finder at one point to prevent its operation, in

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 it completes the excitation circuit of relay 121, at idle contact 271 it opens the search circuit to prevent the operation of the next relay of the individual searcher, in this case relay 220, at work contact 271 it maintains the relay 551 attracted by the intermediary of the earth and the contacts 384, 587, 199, 179,292, 271, 289 and then through the circuit described previously and which leads to a relay 551.

   The line cut-off relay? 26 attracts and blocks, it disconnects the line relay which releases, it draws the locking relay and opens the starting circuit in a manner identical to that described for line 21. The excitation circuit of relay 121 is next: positive to grounded wire 295, contact 273, wire 189, contact 124, relay winding 121, negative. Relay 121 draws in an identical manner to relay 120 to connect the line wires of the last six lines of this group to the unit finder relays. It can therefore be seen that relay 210 simultaneously tests lines 21 and 26. In an identical manner the relays of the individual finder 220, 230, 240 and 230 simultaneously test two lines of the calling group.

   If we now refer to the pre-selection of the previous free connection circuit we can see that the relay 594, in 590, this lock; 1 the earth taken on 559, on 575 it cuts a back multiple connections the earth of the relay 592, which releases if all the connection circuits are occupied, in 574 it causes the relay 597 to attract again and on contact at rest 574 it opens the circuit of the relay 170 which releases.

   The relay 502 attracts as described above and the relay 501 releases when the relay 502 attracts because its blocking circuit is open then in 518, in 508 it connects the ground wire 184 'of the second connection circuit to the contact 567, in 509 it disconnects the ground wire 184 from the first connection circuit

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 of contact 567, in 510 it opens the Initial excitation circuit of relays 502 and 594, in 511 it opens its own blocking circuit at one point, at 512 it closes the blocking circuit of relay 506 at one point.



   Relay 597 attracts when relay 594 operates, at contact 598 and at contact 599 it closes the relay circuit
596 which attracts and opens the blocking circuit of relay 594 which therefore releases. If the following connection circuits are occupied the ground wires 184 ', 184' 'etc are connected to the earth which causes the pulling of the relays 503, 504 etc in sequence and in series with the relay 594 until a free connection circuit is selected.



   There are no other calling lines in the group
20 Relay 552 releases when earth is removed from wire 90.



   The, relay 552, at 572, opens the circuit going to the common relay 89 and to the contacts 579 to 582 inclusive, it prepares the circuit of the remaining group start relays, When the relay 594 releases when the second connection circuit has been selected, the connection relay of the second connection circuit attracts via contact 574 and wire 191 '. The contact 598 of the relay 597 vibrates which causes the release of the relay 596 and the maintenance of the relay 595 in the working position for a certain time.



   The relay 170 releases due to the pull of the relay
594, at contact 116 it connects grounded wire 185 to ground wire 184 to keep the connection circuit busy.



   At contacts 172 to 176 inclusive the relay 170 disconnects the relays of the group finder, in 177 it disconnects wire 296 from wire 197 and connects it to wire 295 to maintain the relay
120 in working position. Relay 170, at 178, disconnects ground from wire 294 and connects grounded wire 293 to wire 294 to keep relay 60 attracted. The relay 170, in

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 178, opens the excitation circuit of the relays of the individual researcher, in 129 it opens the circuit of relay 558. Relay 558 releases and in 584 opens the blocking circuit of relay 557 which releases, in 586 it opens the circuit of relay 551.

   Relay 551 releases, at contacts 546 to 549 inclusive, it prepares the starting circuit of the group start relays for the next call. Relay 551, in 560, removes the multiple earth of relay 592, in 570 it opens the circuit of relays 593 and 595, in 571 it opens the recircuit of relay 595. Relays 593 and 595 release after a certain time and the first in 573 prepares the circuit of relay 597. The distributor is now able to transmit the call.



   The previous operations have all been carried out
 EMI14.1
 éi 1 ''. ;: 11i '-8 of l! 6-, 11; ::;, ion of an apnol, when the subscriber hears the avoidance at 1; = - z.nsx.iet.ti? E, he dials the desired number using 's. 7 ;: call dial. The relay 630 follows the trans- pulses -, ..,.:; C ::; cb let go of them. At the first pulse fl- # ..¯..¯.,: 'J:', '.m'.: ¯ 1,: i; J:, Ji = 1: the multiple excitation circuit 1.i ¯ 'the' ''. =: ',; l:. :: t-c attracted ccpend.aiil: during tuuto la -'1 <"'<: 1,1 <, 1: = .; ofl of iupulciors.

   Relay 650 in 652 opens 1: - CY ;; 1. '' ', 1-, pulse relay 680, which releases and at its GC: -. 8.C'- at rest S52 forms the pre-supply circuit for i: 1; '<..; = on:> ..' 1r: '1; .3, O, ct.tircr de, new in the circuib de la borde, de l 'Dboè, .l!, 1 this circuit is the following: resistance' ".,. :::., ':;): ::, winding of relay C80. Relay 630, on 3C, Q8C ('me earth of wire 3Ç7 and puts wire 627 to earth, At each impulse of odd order the relays 640, 660 e C70 attracts ... t. coni: i cuit: earthed contacts 721, 626, '= :::.', (;, ',' 7, '71w, G28, ul5, in multiple across the windings ¯cs relays 370, 3-30 and through contact 651 through 1 T wind up :: ent upper of relay 640.

   Relay 660 on contact 663, establishes the circuit of relay 400,

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 in 666 he puts the contact 644 to the ground. When relay 670 attracts, at 671 it establishes the blocking circuit of relay 660. When relay 640 attracts, at 642 it connects wire 697 through the lower windings of relays 640 and 650, at 644 it puts wire 555 to earth to attract the first count relay 810.



   At the end of the first pulse, relay 630 draws back into the circuit of the loop of the subscriber line, it is aided by the action of the pre-supply circuit. Relay 630, in 631, again closes the circuit of relay 620 before it has had time to release, at idle contact 632 it opens the pre-supply circuit, at work contact 632 it closes the relay circuit 680 and 650 and establish the circuit of relay 640. The circuit of relay 680 is as follows: positive at contact 643, 653, 672, 632, relay 680, negative.

   Relay 680 attracts again, in 681 it closes the circuit of relay 620, in 682 it puts wire 697 to the earth - to keep relays 640 and 650 attracted and it disconnects the earth of wire 627 to open the initial circuit - excitation of relays 640, 670 and 680. Relay 670 remains energized throughout the sending of the pulses. Relay 680, in 683, again establishes its own blocking circuit through the resistor R1. The supply circuit of relay 650 is as follows: contact 643 earthed, 653, 672, 632, 662, 652, 641, lower winding of relay 650, negative.



  The relays 640 and 650 remain attracted via the contacts 641, 642, 661 and the wire 697. When the relay 650 attracts, at the contact to work 651, it prepares its blocking circuit. Through its upper winding, in 653 , it opens the relay 680 circuit.



   At the start of the second pulse, relay 630 releases in the subscriber loop circuit, in 632 it opens the circuit.

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   Blocking relay 680 and restores the pre-supply circuit. Relay 680 releases, at contact 682 it disconnects the earth of wire 697 to open the blocking circuit of relay 640, it puts wire 627 to earth to keep relays 570, 660 and 650 attracted, Relay 640 releases apparatus for a while, in 644 it disconnects the earth from wire 655 and earths wire 656 to attract relay 820,
At the end of the second pulse, relay 630 draws back into the circuit.

   subscriber loop, in 631 it again maintains relay 620 in working position, in 632 it again establishes the supply circuit of relay 680. Relay 680, in 682, again puts wire 697 to earth without any effect at this moment since the relay is released, it disconnects the earth of wire 627 to release relay 650. Relay 650, at 651, re-establishes the circuit: initial, energizing relay 640.



   Likewise, relays 640 and 650 attract at each odd-order pulse and release at each even-order pulse during transmission of the other pulses. On each attraction of relay 640, at contact 644, the odd-order wire is grounded to cause the attraction of the next odd-order counting relay, on each release of relay 640, on contact 644, the wire of even order is earthed to cause the attraction of the next even order counting relay.



   Relay 400 attracts, due to the attraction of relay 630 at the start of the first pulse, in the following circuit: positive in 663, 633, 706, 749, 875, 803, 455, winding of relay 400, negative. Relay 400, at 419, connects wire 295 grounded to wire 456, at 449 it completes its own blocking circuit, to contacts 490 to 498 inclusive, it connects the relays of the group connector to the contacts of the counting relay .

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   After the transmission of each of the digits by the calling subscriber, relays 630 and 680 remain attracted for a time long enough to cause the release of relay 670, since the release of relay 680 has disconnected the earth of wire 627. Relay 670 thus releases shortly after each period of sending of the pulses, in 671 it opens the blocking circuit of the relay 660 which releases.

   The relay 660, at 661 and 662, causes the relays 640 and 650 to be released if they have drawn,. in touch with. at work 663 it opens the initial circuit. excitation of relay 400, when the contact is at rest 663 it places wire 861 to the ground to cause the relay of the group connector which was prepared when the last counting relay to be energized to attract, in 666 it disconnects the earth of the even and odd order wires to prevent any subsequent sending of pulses to the counting relays. The blocking circuit of relay 400 ′ is as follows: wire 645 grounded through contact 723, 718,
755, 885, 813 (or 864), wire 454, contact 449, winding of. relay 400, negative.



   The counting relays are shown in fig. 8, relays 810, 830 and 850 being attracted for odd order pulses and relays 820, 840 and 860 being attracted for even order pulses. Contact counting relays such as 811 and 812 prepare, through suitable wires of cable 369, circuits leading to the relays of the group connector of fig. 4 during reception of the tens digit, these circuits are closed when relay 400 is drawn, they terminate at the relays of the individual connector of fig. 5 during reception of the ones digit, circuits being closed when relay 37.0 is pulled.

   Each of the relays attracted closes its own blocking circuit, through its contact marked "x", via wire 590 and prepares the excitation circuit of the next relay which, if attracted, opens the relay. blocking circuit of the previous relay which therefore releases. A   @

 <Desc / Clms Page number 18>

 The exception to be considered is that of relay 860 which attracts at the sixth pulse, that is to say at the third pulse of even order. This relay remains blocked, at contact 365 it prepares the circuit of the relay's 810 so that the seventh pulse causes this relay to attract.

   In this way any number of pulses between 1 and 10 can be counted by the six relays and due to the continuous attraction of relay 860 it is ensured that different circuits are prepared via the wires. cable 369 when relays 810, 820, 830 and 840 are prepared a second time.



   In the case where the first digit sent by the calling subscriber is 1, which in the present case is considered as a preliminary impulse, relay 810 attracts, in 813 it opens the blocking circuit of relay 400 so that this relay releases when relay 660 is released for the purpose of causing relay 810 to release.

   If the first digit sent is
6, 4, 5 or 6 the relay 820, 830, 840, 850 or 860 attracts, and when relay 660 releases to ground 861 a circuit is established to attract the corresponding relay of the Group c connector. 'ie relays 420, 430, 440, 450 or @ 30. In the case where the first digit transmitted is 9, relays 450 and 613 pull when relay 660 releases.



  81 the first digit transmitted is 0, the relays 420 and 613 attract as a result of the release of the relay 660 as will be explained more fully in connection with long distance communications.



   If we now assume that the line? 33 is that which is called by the calling subscriber, it is known that the first and second digits which must be transmitted are 3 and 3 respectively after which the call digit must be transmitted. In this case relay 830 draws when relay 660 releases after relay 430 draws in the following circuit:

 <Desc / Clms Page number 19>

   contact 663, 634, 775, 446, 861, 831, wire 3 of cable 369,
493, winding of relay 430, negative. To its upper contacts: relay 430 of the group connector connects the test wires of all the lines of group 30 to the test wires leading to the relays of the individual connector, at 435 it closes its own blocking circuit to wire 188 set. to earth, in 436 it establishes the circuit of relay 880.

   This circuit is as follows: positive at 621, 293, 771, 458, 436, 392, 311, 331, 341, 351, wire 12 of cable 339, contact at rest 862, winding of transfer relay 880, negative. The relay 880, at 881, disconnects the invitation to transmit tone from the calling line, at 862 it establishes its own blocking circuit through the intermediary of the wire 458 put 'to the ground, with the contact at rest 883 it opens the Initiai- excitation circuit of relay 400, in 885 it opens the blocking circuit of relay 400 which releases.

   Relay 400, at 439, disconnects the earth of wire 390 to open the blocking circuit of the counting relay which has drawn, in this case the relay 830, at 459 it opens the initial circuit of relay 880 and at contacts 492 to 499 inclusive, it opens the circuit leading to the relays of the group connector.



   The calling subscriber can now send the second digit or digit 3. The relays 630, 680, 640, 650, 660, 670 attract as he has. previously described to bring the attraction of relay 830. In addition to the on contact 663, the relay 660 establishes the excitation circuit of the relay 370, as follows: positive, on contact 663, 633, 706, 749 ,, 875, con-. tact at work 883, 387, winding relay 370, negative.



   The relay 370 attracts, at 383 it blocks itself by the intermediary of the contacts 388, 874, 754, 745 and 723 and of the wire 645 which is grounded. At contacts 371 to 375 inclusive, and 376 to 380 inclusive, relay 370 prepares the circuits leading to the relay
310 to 350 inclusive of the individual connector, in 385 it puts the wire
390 to earth to provide a blocking circuit for the relays

 <Desc / Clms Page number 20>

 count who are attracted.



   After the second digit 3 has been sent by the calling subscriber, the relays 670 and 660 release as before, the relay 660, in the on contact, opens the initial circuit. excitation of relay 370, when the contact is at rest 663 it closes the circuit of relay 330 as follows: positive, contact at rest 633, 634, 775, 446, 861, 831, wire 3 of cable 369, 373, winding of relay 330, negative. Relay 330, at 338, prepares the line test circuit at one point? 33 but only if relay 330 is pulled together with relay 360.

   Relay 330, at 337, connects test wire 443 of line 33 to relay 770, to contacts 335 and 336 it connects line wires 366 and 365 of the connection circuit to wires 395 and 596, at 334 it establishes relay 870 circuit, at 332 it is blocked by wire 188 which is earthed, finally at idle contact 331 it opens the initiai circuit, for supplying relay 880.



   The excitation circuit of relay 870 is as follows: positive at contact 554, 384, 389, winding of relay 870, negative. Relay 870, in 872, transfers the blocking circuit of relay 880 to the idle contact 663, in 873 it establishes its own blocking circuit, in 874 it opens the blocking circuit of relay 370 which releases, in 878 it opens the blocking circuit of relay 710, but this relay remains attracted through 708, 777, 694, 295, 735 and 723 and the 645 grounded wire.



  Relay 370 releases when its blocking circuit opens, at contacts 371 and 381 it disconnects the relays from the individvel connector, at 387 it disconnects the earth from wire 390 to release relay 830.



   The above description shows the operation of the individual connector relays for the first five lines of the called group. Operation for one of the last five

 <Desc / Clms Page number 21>

 lines of the group is somewhat different. We can assume that the second digit emitted is 8. In this case the relays 820 and 860 attract. When relay 660 releases after sending the second digit the relays 330 and 360 attract. The power supply circuit for relay 360 is as follows: with the contact at rest 663, 634, 775, 446, contact at work 861, wire 11 of cable 369, contact '381, winding of relay 360, negative.

   When the relay 360 attracts, at the idle contact 363 it disconnects the test wire 369 from the circuit for connecting the test contacts of the first five lines of the group, at the working contact 363 it connects the wire 364 to the test contacts of the last five lines of the called group. At idle contact 362, relay 360 opens the circuit prepared for relay 452, at work contact 362 it prepares the circuit of relay 431 at one point, at 361 it locks to wire 188 grounded. The power supply circuit for relay 330 of the individual connector is identical to that which has been described, up to contact 861, then it takes the working contact and contact 822, wire 8 of cable 369, the contact 378, the winding of the relay 330 to end in the negative.

   At contact 552, relay 330 locks to wire 188 grounded, through idle contacts 343 and 353, at 338 it connects wire 364 to the test wire of line 38, at 335 and 336 it prepares the connection of the line, in 334 it causes the relay 870 to attract as before.



  When the relay 870 attracts, it causes the release of the relay 370 and that of the counting relays 820 and 860 which had drawn. Operation from this point is the same for line 38 as for line 33.



   If it is now assumed that the connection has been established with line 33, it can be considered that the calling subscriber can send the call digit to selectively ring the desired subscriber connected to this line. In case the number emitted is 1 the inrush current is sent from the inrush wire? 1 coming

 <Desc / Clms Page number 22>

 from the call switch (not shown) through the positive line wire to call the subscriber? 331. The relays 630, 680, 640, 650, 680 and 670 attract as a result of the sending of the call digit, known as previously described. In this case, since the number 1 is transmitted, the relay 810 attracts as before.

   When relay 660 attracts, at the time of sending the third digit or call digit, to the idle contact 663 it opens the blocking circuit of relay 880 which releases. At contact 664, relay 660 establishes the circuit of relay 700 as follows: wire 188 grounded, contact 377, 639, 664, 638, relay winding 700, negative.



  At 635 relay 660 closes a new relay 710 blocking circuit as follows: wire 645 grounded, contact 723, 735, 295, 594, 665, 645, winding of relay 710, resistance P2, negative. Relay 880 releases as a result of relay 660 operation, at contact 80 @ it connects grounded contact 876 to wire 390 to provide a blocking circuit for the count relays.

   When the relay 700 attracts, in 701 it separates the winding of the relay 610, in 705 it connects a multiple terminal to the T.3 wire. start-up of the tonal generator, in 706 it establishes the excitation circuit of relay 726 by means of wire 633 and of the contact at work 663, ca 707 it establishes @ under a clean blocking circuit through the intermediary of the contact at rest 776 and wire 188 grounded, at 703 it opens the blocking circuit of relay 710.

   The relay 706 attracts, in 727 it prepares in one point the test circuit of the relay 770. The relay 810 attracts following the sending of the call digit 1, in 818 it prepares the connection of the circuit sending the current of call.



   After sending the last pulse of the call digit, relays 660 and 670 release as described above. On contact on 663, relay 660 opens the circuit

 <Desc / Clms Page number 23>

 of relay 726, when the contact is at rest 663, it completes the test circuit of relay 770 and of relay 471 in the case where the called line is free, in 655 it opens the blocking circuit of relay 710 which therefore releases.



   If line 33 is busy, test lead 443 of the called line is grounded to short relay 770 in the following circuit: normally closed 663, 634, 727, lower relay winding 770, 364, 363, 349, 337, 397, 413, 443, positive busy line called.



  After a while relay 726 releases and at 727 opens the test circuit to prevent seizure of line 33 in the event that it becomes free. Relay 710 releases following the release of relay 660, at 712 it establishes the circuit for sending the busy tone as follows: source of busy topality, 702, 712, tone capacitor TC, 793 , 287,214, 283, 117, calling subscriber loop. When the subscriber hears the busy tone he hangs up his receiver and releases the devices in a manner which will be described in more detail below.



   If line 33 is free, relay 770 draws in series with relay 471 of the called line in the circuit which has been described above except that it borrows the winding of relay 471 to end up negative. Relay 770, at 771, completes its blocking circuit, at 772 it connects a direct earth-socket at contact 722 to the connection circuit and to the test wire of the line called to keep the cut-off relay attracted and to occupy the called line, in 773 it connects an earth to the generator starting GS wire to start the calling machine, when the contact is idle 776 it opens the blocking circuit of relay 700 which releases, when the contact is on 776 it establishes the excitation circuit of relay group 432 or 431, depending on the state of relay 560,

  'in 777 it opens at one point the circuit of relay 710 to prevent

 <Desc / Clms Page number 24>

 that it attracts (The. new as a result of releasing relay 700. When relay 700 releases, at 701, it disconnects the shunt placed at the end of the winding of relay 610 to allow this relay to attract into the circuit. from the subscriber's loop at 702 it disconnects the circuit sending the busy tone of the calling line and at 705 it disconnects the earth of the TS start wire of the tone generator to stop this machine.

   When the relay 471 of the called line attracts, in 477, it connects the wire 443 to the wire 484 to occupy this line in the researchers of the connection circuit, in 478 and 479 it disconnects the relay 472, on 480 it makes the relay attract 470.



   In addition, relay 432 attracts as a result of the operation of relay 770, at contacts 414 and 415 it connects the line wires of the connecting circuit to line wires 485 and 486 of the called line.



   At the start of each call cycle the call machine places wire 659 momentarily and pulls the relay 890 retort follows: wire 659 grounded, 879, 667, 709, 746, 778, 757, 899 , winding of relay 890, negative. Relay 690 attracts, at its "x" contact 898 it completes its blocking circuit before contact 899 opens. To contacts 891 and 895 relay 890 connects the call wire? 1 to the positive wire 486 of the called line, at 892 it connects the negative wire of the called line to relay 780, at 897 it completes the circuit for sending the ringing tone to the calling line.



   The intermittently grounded wire connected to the # 1 wire extends through 818, 895, 868, 866, @ 91, 737, 782, 366, 355, 395, 415, 486 and through the yoke and the ringing of the first five subscriber lines of this group, to earth. The desired call code is transmitted on this line to call the subscriber of N 331. The circuit for returning the call tone to the calling subscriber passes through the wire.

 <Desc / Clms Page number 25>

   call? 1, 897, 738, the RBC capacitor, 793, the attracted relay contacts of the individual seeker and the group seeker to terminate in the calling line wire.



   If the call digit is 6 or higher the 860 relay pulls in and the call wires 1 through 5 are connected to the negative wire of the called line, while the positive wire is connected to the relay '780.



   When the called subscriber answers the relay 780 draws into the called subscriber's line circuit, into the inrush sending circuit which has been described above and which then borrows the negative wire of the line. 485, 414, 396, 336, 365, 781, 736, 892, 867, 739, top winding of relay 780, negative. The relay 780 attracts, at its "x" contact 783 it establishes its own blocking circuit at the earthed contact 722. At contacts 781 and 782, relay 780 opens the call circuit and establishes the excitation circuit of relays 750 and 613 through the loop of the called line.



   When relay 750 attracts, in 751 it completes the excitation circuit of relay 740, in 753 it opens the blocking circuit of relay 608 which releases. Relay 613 attracts into the called subscriber's loop circuit, it does not perform any useful function at this time except that it powers the called line in concert with relay 750. When relay 608 releases, at contact 605 it disconnects the temporary earth and substitutes for it a direct earth which is connected to the connection circuit to prevent the release of this circuit when the temporary earth is removed. This temporary earth frees the connection circuit in the event that it does not go into conversation position within a determined time.

   When relay 740 attracts, in 741 it removes the shunt placed on contact 734, in 742 it establishes its own blocking circuit, in 743 it disconnects the earth of the generator starting GS wire to stop the machine. call, in 744 he completed the

 <Desc / Clms Page number 26>

 excitation circuit of relay 600, in 745 it disconnects the earth of wire 754 to release relays 870 and 890, in 746 it opens at one point the initial excitation circuit of relay 890. The circuit of relay 600 is as follows : 645 wire grounded, 723, 735, 295, 694, 647, 752, 744, 635, 611, 186, 128, 187, winding of relay 600, negative.

   Contacts such as contacts 128, 138, 148, 158 and 168 are provided for each group of lines in the event that these lines require reverse polarity for supervision, counting or any other purpose. Relay 600, in 603, completes its own blocking circuit, in 601 and 602 it reverses the polarities in the loop of the calling line to operate a meter, to cause the cash to be collected or to give supervision if necessary . Relay 890 releases following the operation of relay 740. it opens the call and return circuits to the generator, Relay 870 releases due to the pull of relay 740, at contact 876 it disconnects the earth from the generator. wire 390 to unlock the counting relay which attracted.

   The connection between the calling line 21 and the line 33 is now established through the conversation threads represented by reinforced lines. When the called subscriber hangs up his receiver, the called line loop opens and relays 750 and 613 release.



  In 732, relay 750 releases relay 600 to reverse the polarities, in 753 it causes relay 608 to attract again. Relay 608 attracts and blocks as described previously, in 605 it disconnects the earth. and substitutes the temporary earth for it to automatically release the connection circuit after a determined time if the calling subscriber neglects to hang up.



   When the calling subscriber hangs up his receiver the relays

 <Desc / Clms Page number 27>

 610 and 630 relax. In 631, relay 630 disconnects one of the multiple grounds of release relay 620, in 632 it releases relay 680. When relay 680 releases, in 681, it opens the circuit of relay 620 which releases after a certain time. Relay 620, at 621, disconnects the earth from wire 293, it opens the circuit of relays -730 'and 770, it removes the busy earth of the calling line, and releases the relay 660. The relay 770 releases when its blocking circuit is opened by relay 620, in 772 it disconnects the earth of wire 364 and of test wire 443 of the called line, thus it opens the circuit of relay 471 to make the called line free.

   At contact 776, the relay 770 opens the blocking circuit of the relay 740 which releases, it also opens the circuit of the drawn relay 431 or 432 of the group connector which therefore releases. When relay 720 releases, in 722 it opens the blocking circuit of relay 780 which releases, in 723 it disconnects wire 645 grounded from wire 295 to release relay 120, it disconnects the earth from wire 188 to release the relay 430, the relay 330 (the relay 360 if it is attracted), the relay 210 (the relay 270 if it has attracted) 'and the relay 122. When contact is made 724, the relay 720 removes a multiple connections to the earth of the guard wire 184, at the rest contact 724 it opens the blocking circuit of the relay 608 which releases.

   When relay 608 releases at 606 it disconnects a multiple earth from ground wire 184, at 607 it grounds wire 559 to keep relay 592 engaged. When relay 120 releases, at contact 126, it disconnects ground from wire 184, to make this connection circuit available for further calls.

   The relays 120, 122, 210 '(270 and 360 if they have attracted) 330, 430 and 432 release and disconnect the calling and called lines from the connection circuit; Relay 740 and the other relays of the

 <Desc / Clms Page number 28>

 connection circuit return to normal position, The relays 60 and 471 of the calling and called lines release when their circuits open, they cut the circuits of the relays 50 and 470 which are associated with them, these also release after a certain time, the line relays 70 and 452 should not attract when the cut-off relays release. All organs have returned to their normal position and can be used for all subsequent calls.



   In order to describe the operations which take place in the case of a communication between two stations connected to the same shared line, it will be assumed that the subscriber 216 of line @ 1 wishes to call another subscriber connected to the same line. that he or the subscriber 211. Because a call is made, a free connection circuit is connected to line 21 as has been described previously.

   The digits 2 and 1 having been transmitted, the relays 420 and 310 of the connector draw, after sending the call digit 1 the called line is tested and found busy since the relay 770 is short-circuited and the busy tone. pation is sent to the calling line as described previously. The calling subscriber hangs up his receiver and relays 810 and 630 release followed by relay 680. When the contact is at rest 681, relay 680 completes the blocking circuit of the GO relay of the calling line through the working contacts of the caller. relay 700 and the contacts at rest of relay 770 and via the earth taken at 681.



  This same earth also keeps relay 720 attracted and causes relay 630 to attract when relay 620 releases.



   Relay 720 is kept attracted in this circuit, Relay 730, at 731, connects a direct earth to wire 564 to keep relays 60 and 720 attracted, at 732 it completes its blocking circuit independently of contact 704, at 732 it connects wire 293 grounded through the winding

 <Desc / Clms Page number 29>

 of relay 770 to cause the attraction of the latter, in 734 it opens the shunt placed on contact 741 and in
735 it disconnects the earth from wire 295 to release. relay 120.



   Relay 120 therefore releases, at contacts 117 and 118 it disconnects the line on the researcher side in the connection circuit, at 12'6 it removes one of the multiple grounds of wire 184.



   When the relay 770 attracts, in 771 it locks on the 293 grounded wire, in 772 it connects the earth taken to the contact
722 at wire 364, at 773 it starts the call machine, at idle contact 776 it causes the release of relay 700, at work contact 776 it places wire 368 to earth to attract relay 422.



   The relay 700 releases when its circuit is opened by the relay 770. The relay 700, at 702, opens the circuit for sending the busy tone, at 705 it disconnects the earth of the TS start wire of the tone generator. Relay
422 attracts, at its upper contacts it connects the connection circuit to the wires 57 and 58 of line 21 to prepare the circuit for sending the inrush current.

   Relay 890 draws when wire 659 is grounded, it connects the call wire,
N 1, to the positive wire, 58, of the line as follows: inrush current lead wire 1, 818, 895, 868, resistor R4, 866, 891,
737, 782, 366, 315, 'lower contacts of relay 422 of group connector, wire 58 of cable 159, positive wire of line
21, ring tones for the sets connected to this thread.



   The desired calling code or the appropriate generator is connected in this circuit to selectively call the subscriber
211.



   When the called subscriber answers, or if the caller is the first to pick up, the relay 780 attracts to cut the circuit sending the inrush current, the relays 750 and 613 release in

 <Desc / Clms Page number 30>

 the circuit of the subscriber loop as described above. Relays 608, 890 and 870 release, relays 740 and 600 pull as described previously, except that in this case when relay 740 attracts relay 720 circuit opens at contact 741. When relay 720 releases, in 725 , it disconnects the earth of wire 188 to release relays 740, 420, 422, 310 and 122.



  Relay 720, at contact 725, opens the circuit of relay 608, in 724 it removes the multiple earth of wire 184, in 722 it disconnects the multiple earth of wire 364 which was brought to it through contact 772, it opens the circuit blocking relay 780 which consequently releases. Relay 720, at contact 723, disconnects ground from wire 188 to release relays 122, la, 310, 420, and 740. Finder and connector relays release and open relay blocking circuit 730 and 770 as well as the calling and called line cut-off relay. When relay 608 releases, at 606 it removes the earth from wire 184 and at 607 it grounds wire 699.

   All of the connecting circuit relays have returned to the idle position and the connecting circuit can be used to service other calls.



   When the relay 60 releases the contacts 62 and 63 close the excitation circuit of the relay 70 in the circuit of the subscriber's loop, on contact at work 64 it momentarily opens the circuit of relay 50 and at contact at rest 64 it grounds permanent alarm wire 99. Relay 70 draws into the subscriber's loop circuit, at 72 it grounds test lead 56 to mark that line as occupied on the connector side in the connection circuit, at 73 it keeps the blocking circuit of the relay 50 closed. The supply to the two subscribers is taken through the windings of the relay 70.

   When the two subscribers rac-

 <Desc / Clms Page number 31>

 hook their receiver at the end of the communication the relay
70 releases to disconnect the earth from wire 56 and 'release the line, at contacts 72 and -73 it opens the relay circuit
50 which releases to open the alarm circuit at 52, at 51 it prepares the circuit marking the line as calling at one point, at 53 it prepares the starting circuit at one point.



   Two groups of junctions are accessible from the connection circuits, one group is reached by sending the digit 0, the other group is a group of unpowered junctions. that is reached by sending the number 9 as the first number. When the call sent begins with the number 0, a free connection circuit is connected to line 21 and the sending of the number 0 causes relays 840 and 860 to be attracted as described previously. It should be remembered at this time that relays 50, 60, 120, 122, 210, 630, 620, 660,
670, 680, 720, 710, 608 and 400 are also drawn. When the relay 6eO releases after the period of sending the pulses and since the relays 840 and 860 are attracted, the excitation circuit of the relays 420 and 613 closes.



   The relay 420 at its upper contacts connects the test wire of the lines of group 20 to the test contact of the relays of the individual finder, at 425 it is blocked by, through the grounded wire 188. In 426 it establishes the excitation circuit of relay 340. This circuit is the following: positive, contact at work 621, 293, 771, 458, 426,
459, 392, 311, 321, 331, 341, 351, wire 12 of cable 369, 862,
843, wire 14 of cable 369, coil of relay 340, negative.



   When relay 613 attracts, at 616, it closes the circuit of relays 700 and 360. The excitation circuit of relay 360 is as follows: wire 645 grounded, 723, 188,

 <Desc / Clms Page number 32>

 776, 637, 616, 638, 429, 391, winding of relay 360, negative. Relay 700 is powered in parallel with relay 360 in this circuit. When relay 360 draws, at 361 it locks up through grounded wire 188, at 363 it transfers test wire 364 from wire 349 to wire 359.



  When the relay 340 attracts, at its contact "x" 432, it is blocked by the intermediary of the grounded wire 188 and the contact 353, at the working contact 341 it closes the circuit of the relay 350 of the individual connector, at 348 it establishes a circuit through the test lead of junction N 29 in series with relay 770. If this junction is occupied, which earth is connected to the test lead of the junction? 29 short-circuits relay 770 and relay 350 of the individual connector attracts after a while.



  Relay 350 operates identically to relay 340 to cause the junction to be tested? 20. If the junction? 20 is occupied the ground of the test lead of this junction short-circuits relay 770 and relay 710 is short-circuited in the following circuit: wire 645 grounded, 723, 735, 295, 694, 647, 878, 756, 719, relay winding 710, 715, 386, 351, 341, 331, 321, 311, 392, 459,426, 458, 771, wire 293 grounded.



   When relay 710 releases, in 712 it establishes the circuit for sending the busy tone, in 713 it opens the circuit of relay 613 which releases, in 716 it disconnects the multiple earth of the TS wire for starting the generator of tones, in 718 it opens the blocking circuit of relay 400 which releases and brings back to rest position the counting relays which have drawn. As a result of receiving busy tone, the calling subscriber hangs up and releases the connection circuit as described above.



   If the junction? 20 is free relay 770 attracts

 <Desc / Clms Page number 33>

 in series with: relay 30, at work contact 771, relay 770 is blocked by means of earthed wire 293, When contact at rest 771 it opens the circuit of the next relay of the individual connector to prevent its operation if the last relay of the individual connector drawn is not the last relay of the group; or it opens the short-circuit which was previously placed at the terminals of relay 710 if the last relay of the individual connector of the group has attracted.



   Relay 770 to contact 772 connects a ground through NO contact 722 and contact 772 to test lead 364 to keep relay 30 engaged and to occupy junction 20; on contact 773, it earths the GS wire for starting the generator, in 775 it opens the circuit of relay 613 which releases, in 776 it attracts relay 421 of the group connector. To contacts 411 and 412, relay 421 connects the line wire of the connection circuit to wires 67 and 68 of junction 20, to contact 427 it establishes the excitation circuit of relay 790.

   Relay 790, at contact 791, short-circuits relay 710 which releases, at 792 'and 793 it connects the wires of the calling line directly to wires 67 and 68 of the junction via wires 399 and 300 At contact 793, relay 790 also opens. the circuit of relay 630, in 794 it opens the circuit of relay 720, in 795 it is blocked by the intermediary of the wire 293 grounded, in 796 it connects the wire 295 grounded to the wire 364 by the intermediary of 772, in 797 it disconnects the earth of the starting wires of the tone generator and of the calling machine, in 798 it places a multiple earth on wire 188 to keep attracted the relays of the seeker and the caller. connector, in 799 it removes a multiple earth of wire 184.

 <Desc / Clms Page number 34>

 



   Relay 630 releases due to the pull of relay 790, in 631 it removes the multiple earth of relay 620 and in 632 it releases relay 680. The trunk repeater (not shown) operates in the well-known manner when the loop of the calling subscriber is connected to wires 67 and G8 and to wires 47 and 48, it returns a ground to wire 66 to occupy the junction and to keep relays 30, 60, 770 and 790 drawn in the following circuit: wire 66 earthed included in the cable 169, 410, 398, 358, 363, 364, 772, contacts 796 and 795 to block relay 790 and wire 293 and normally open contact 771 to block relay 770.



   Relay 710 releases when the short circuit closes across its winding as a result of operation of relay 790, at contact 178 it opens the circuit of relay 400 which releases. When relay 680 releases, at 681 it opens the circuit of relay 620 which therefore releases.



   Relay 720 releases as a result of operation of relay 790, at 723 it disconnects one of the multiple grounds of wire 188 which remains connected to ground at contact 798, at 725 it opens the blocking circuit of relay 608. When relay 613 releases , at 616 it opens the blocking circuit of relay 700 and the initial excitation circuit of relay 360.



  When relay 400 releases, at contact 429, it opens the circuit of relay 700 which releases, at 419 it opens the initial excitation circuit of relay 790 which is blocked by the intermediary of a ground brought from the interurban repeater. , at 439 he disconnects the earth from wire 390 to release the counting relays which have drawn, at contacts 492 to 498 he disconnects the relays of the group connector of the counting relays. After a certain time, relay 620 releases, at contact 621 it disconnects the multiple earth of wire 293 which

 <Desc / Clms Page number 35>

 however remains connected to earth via the trunk repeater in the circuit which has been described above. Relay 608 releases, in 606 it removes the multiple earth of wire 184.

   When the relay 700 releases, at 703, it disconnects a multiple earth of the wire 364 which however remains connected to the earth through the intermediary of the interurban repeater, at 7'04 it prevents the operation of the relay 730.



   The loop of the calling line is now connected directly through the trunk repeater connection circuit and the call establishment continues in the well-known manner., Power is supplied to the calling line by the telephone. interurban repeater., the supply bridges of the local connection circuit having been cut due to the attraction of relay 790.



   The release of the connection circuit is controlled by the repeater since it connects a ground to wire 66. When the trunk repeater is released after the communication the ground of wire 66 is cut which opens the circuit of relay 30. and relays 770, 790 and 60 which therefore release. When relay 770 releases, on contact 776, it opens the circuit of relay 421. When the relay
790 releases, 'in 798 it' disconnects the earth of wire 188 to release relays 120, 122, 210, 560, 350 and 420, at contact 799 it puts wire 699 to the earth. When the relay
130 releases, at contacts 117 and 118, it disconnects the calling line from the connection circuit, in 126 it disconnects the earth from wire 188 to release the connection circuit.

   When relay 122 releases, at 119 it disconnects the calling line test lead from the connection circuit. Relays 360, 350, 430 and 421 release and disconnect the junction of the connection circuit. When relay 30 releases, on contact
34 'it opens the circuit of relay 20 which releases and relay 60

 <Desc / Clms Page number 36>

 releases to cause the release of relay 50 as described above.



   If the calling subscriber wishes to initiate a call to the second group of trunks, which in this case are non-powered trunks, he sends the number 9, the connection circuit operates as described previously and the counting relays 830 and 860 attract after sending the number 9 and possibly cause the operation of relays 430 and 613 as follows: positive, contact at rest 663, 634, 775, 446, contact 861 where the circuit is divided into two branches, one borrows contacts 861, 832e wire 9 of cable 369, 499, the winding of relay 430 to end in negative, the other branch borrows wire 4986, contacts 469, 445, 863, 834, 747, 713, 619 , the winding of relay 613, to end in negative.

   When the relay 430 attracts, at its upper contacts it connects the test wire of the junctions and lines of group 30 to the relay of the individual connector, in 435 it locks to the wire 188 grounded, in 436 it establishes the circuit from relay 340 which is the first of the relays of the individual searcher operating the search for the junction, at contact 616 the relay 613 establishes the excitation circuit of the relays 700 and 360 as has been described previously. The relay 360, at the contact 361, is blocked by the intermediary of the grounded wire 188, in 363 it carries out the transfer of the test wire. The excitation circuit of relay 340 is as follows: wire293 grounded, 771, 458, 436, 459, 592, 311, 321, 331, 341, 351, wire 12 of cable 369, 862, 843, 833, wire 14 of cable 369, coil of relay 340, negative.

   Relay 340 attracts, at contact 342, it blocks through wire 188 grounded and contact 353, at 348 it connects the test wire to junction 39 in series with relay 770, to contact 341 he closes the

 <Desc / Clms Page number 37>

 circuit, relay. 350 which is the second relay of the individual connector performing the junction search. If the N junction 39 is occupied an earth is connected to the test lead of this junction which causes the shorting of the relay 770 as previously described.

   The relay 350 attracts' after a certain time and in 352 is blocked by the intermediary of the grounded wire 188, At contact 353 the relay 350 opens the circuit of the relay 340 which releases, in 358 it connects the relay of test 770 in series with the N 30 junction test lead.



   If the junction is free, relay 770 draws in series with junction cut-off relay 30 in the following circuit: wire 293 grounded, 419, 456, 774, lower coil of relay 770, 364, 363, 359, 358, 398, upper contact of relay 430, test lead of N junction 30, winding of cutoff relay associated with junction 30, negative. In 771 the relay 770 opens the search circuit and on contact 771 establishes its blocking circuit through its upper winding and wire 293 grounded. At contact 776, relay 770 completes the following circuit which powers relay 431: positive, 645, 723, 776, 368, 362, 393, 434, winding of relay 431, negative.



  Relay 431 at its upper contact connects the line wire of the connecting circuit to the line wire of the junction, at 437 it closes the circuit of relay 690. Relay 690, at 692, closes the circuit of relay 760 by through contact 681 grounded and wire 624, at 683 it is blocked by means of wire 293 grounded, at 694 it opens the circuit of relay 710, at 695 and 696, it prepares the circuit for sending the inrush current.



   When relay 710 attracts, in 713 it releases relay 613, in 718 it releases relay 400 which, in @

 <Desc / Clms Page number 38>

 429 opens the circuit of relay 700, at 439 it disconnects the earth of wire 390 to release the counting relays which have drawn, finally at contacts 492 to 498 it disconnects the relay from the group connector of the counting relays. When relay 760 attracts, at contacts 761 and 762, it reverses the connection of relays 513 and 750 to contacts 781 and 782 of relay 780.

   When relay 700 releases, at 705 it disconnects the earth of the TS start wire of the tone generator, at 701 it removes the shunt placed at the terminals of the winding of relay 610 which therefore draws in the circuit of the tone generator. the calling subscriber, in 709 it connects the relay 890 to the wire 659. When the wire 659 is earthed by the calling machine, the relay 890 attracts and blocks in a manner identical to that which has previously described. When relay 890 attracts, in 897 it closes the circuit. call return of the calling line, in 895 it completes the circuit for sending the inrush current. The receiving device of the junction operates and causes the pull of relay 780 into the call circuit.

   The relay 780, at 783, closes its own blocking circuit via the earth taken at the working contact 722, at the idle contacts 781 and 782 it disconnects the circuit sending the inrush current and connects the junction not supplied to relays 615 and 750.



   Relays 750 and 613 are now supplied in series through the conversation wires shown in reinforced lines and the junction bridge. At contact 614, relay 613 at one point prepares the circuit of release relay 620 to place the release of the connection circuit under the control of the junction. The relay 750, in 751, completes the circuit of the relay 740, in 735 it causes the release of the relay 608. When the-relay 740 attracts, in 742, it is blocked by the intermediary of the wire 188 grounded, in 743 he de-

 <Desc / Clms Page number 39>

 connects the generator start wire earth to stop the calling machine, at 745 it opens the blocking circuit of relay 890. The supply current is supplied to the calling line through relays 610 and 630.

   At the end of the conversation and if it is assumed that the calling subscriber hangs up first, relays 610 and 630 release. In 631 the relay 630 opens the circuit of the relay 620, in 632 it opens the circuit of the relay 680. The relay 680 releases, on contact at work 681, it opens the circuit of relay 760 and at contact at rest 681 it closes. the circuit that maintains the relay
620 attracted which also keeps the connection circuit in service. Relay 760 releases following the release of relay 680, at contacts 761 and 762 it reverses the polarities of the battery in the windings of relays 613 and 750 through the wires of the junction to give any supervision to the operator . when, Empress releases the junction, relays 613 and 650 release.

   Relay 750, at 653, causes relay 608 to attract again. When relay 613 releases, at 614, i opens the circuit of relay 620. Relay 620 releases after a certain time, on contact 621 it disconnects the earth. wire 293 to release the calling line and release the cut-off relays, and also to release relays 690, 720 and 770.



   If Empress cuts the connection first, relays 750 and 613 release. Relay 7'50, to contact 755i, connects the temporary earth so as to release the connection circuit after a certain determined time in the event that the calling subscriber fails to hang up.



  . When the calling subscriber hangs up his receiver, the connection circuit is released as described above.



   The operation of the connection circuit when it has

 <Desc / Clms Page number 40>

 entered by a long distance repeater, through the wires 66, 46, 47 and 48 of the junction 20 for example, is the same as that which has been described previously in the case where a local subscriber made a call. In this case, however, the long distance repeater by the first pulse of the first digit of the number called causes the cutting of wire 47 which opens the circuit of relay 610, a negative polarity is connected to wire 48 to attract relay 630.

   Relay 610 does not attract to allow relay 790 to operate. After sending the inrush current and when the called subscriber answers the relay 780 attracts and locks, it transfers the loop of the called subscriber to relays 750 and 613 which attract as described previously. The relay 750 causes the attraction of the relay 740 and the release of the relays 608, 870 and 890 as before, in 752 it completes the circuit of the relay 790 before the relay 740 has drawn. When relay 790 attracts, at contacts 792 and 793, it connects the junction directly to the called line and releases relays 630, 750 and 615.

   In 794, relay 790 opens the circuit of relay 720, in 796 it provides a new blocking circuit, for relays 770 and 780, in 797 it disconnects the earth of the GS wire. start of the generator, in 798 it puts wire 188 to the ground to keep attracted the relays of the finder and the connector. The relays 750, 613, 630, 680, 620 and 720 release retort as previously described, the earth which is returned from the trunk repeater via wire 66 keeps the relays 770, 780 and 790 of the relay circuit attracted. connection as described previously.

   The current supply of the called subscriber is supplied by the trunk repeater. When the trunk repeater is released, the earth is disconnected from wire 56 which releases the cut-off relay of the called line, the cut-off relay of the trunk and the relays 770, 780 and 790, thereby the circuit @

 <Desc / Clms Page number 41>

 connection is released as described previously, in addition in this case releasing relay 790 releases the finder and connector relays and relay 740.



   In the case where the connection circuit is kept in a position different from the conversation position, because the calling subscriber does not send the required digits, because the calling subscriber does not hang up after receiving busy tone, due to the fact that the calling subscriber does not hang up if the called party does not answer or after the latter has already hung up, or because one of the two subscribers does not answer in the case of '' a call between two stations connected to the same shared line, the connection circuit is released automatically after a certain time following the disconnection of the earth from the TCO wire

     At regular intervals after a call is made, the equipment in time (not shown) momentarily disconnects the earth from the temporary connecting wire. If the connection circuit is not in the talk position at this time, (relay 608 'being released) disconnecting the earth from the temporary connection wire also disconnects the earth from wires 645 and 188 to release the finder. , the connector and the connectors of the connection circuit in a manner which will be described below.



   In the event that the fuse F placed in the supply circuit of the connection circuit relay blows the relay 608 draws into the circuit comprising the fuse alarm wire FA. At 606, the relay 608 sets to earth the ground wire 184 of this connection circuit to mark it for occupation, in 607 it removes the multiple earth of wire 669.



  The alarm relay (not shown) draws in series with the relay 608 to operate an alarm. When the fuse is replaced, relay 608 releases.



   . When all connection circuits are occupied,

 <Desc / Clms Page number 42>

 all multiple connections to earth are disconnected from wire 669 to cause relay 592 to release. When relay 592 releases, on NO contact 589 opens the circuit of relay 591, cuts the starter wire and cuts it. blocking bearing of the connection circuit selection relay which has drawn, when the contact is open 589, it completes the circuit of relay 597.

   At contact 543, relay 592 opens the circuit of relay 551 and prepares the circuit for the start wire of the tone generator, at contact 500 it connects the busy tone of all connecting circuits to common wire 98 so that trunk trunks receive this busy tone if a call is made on them. Relay 597 attracts, at contacts 598 and 599 it attracts relay 596. Relay 596, in 569, attracts relay 595, at its lower contact it opens the blocking circuit of relay 594. Relay 595, in 376 , attracts the relay: 595, the latter in 575 opens the circuit of relay 597.

   Relay 597 releases its weighted spring to release relay 596 and day release relay 595 after a determined time where 1; a moment when the weighted contact 598 no longer closes its working contacts during its vibration. At contact 576, relay 395 opens the circuit of relay 595 and the latter at contact 375 causes relay 597 to attract again and the cycle in question continues until a free connection circuit has become available. When a connection circuit becomes free, a ground is connected to wire 669 and the relay is 592 to be said.

   At contact 500, the relsis 592 disconnects the busy tone from wire 98, in 534 it opens the starting circuit of the tone generator and prepares the circuit of relay 551, in 589 it closes the circuit passing through the upper winding of relay 501 in series with relay 594. As a result of these operations, the relays

 <Desc / Clms Page number 43>

 593, 595,596 and 597 relax. Relay 501 attracts, at 511 it blocks in series with relay 591, at contact 510 it connects ground wire 184 to relay 502.

   The relay 591 draws in series with the relay 501, at idle contact 588 it opens the circuit of relays 501 and 594, at idle contact 588 it opens the starter circuit using wire 191.



  If the connection circuit N 1 is occupied, an earth placed on the ground wire attracts the second connection circuit selection relay 502 as well as the relay 594, the distributor selects the first free connection circuit as has been described. previously.



   In the event that the connection circuit is seized. but that it cannot find a calling line or if the call is to be transferred to another connection circuit as described previously following the operation of relay 260 of the individual searcher, when relay 595 releases after a determined period, the circuit of the relay 593 is open at the closed contact 576, at the closed contact 576 the circuit is completed for the supply of the second selection relay of the circuits for connection in series with the relay 594. D In an identical manner to that which has been described above, the operation of relay 594 causes the release of the connection circuit and that of the relay 170. The distributor searches for a new free connection circuit as described previously.


    

Claims (1)

EMI44.1 CLAIM S. ----------------------------- 1. A row finder in which the rows are divided into groups and in which as a result of l 'transmission of a call by a line of one of the groups, all the lines of the group are tested by the successive operation of the relays of a EMI44.2 group in a preselected cOl1nexion circuit, a certain number of lines of this group both tested simultaneously as a result of the operation of each of said relays. 2. A line finder in which the lines are divided into groups and in which each group is subdivided into groups, in which the sending of a call by a line of one of the groups all lines of the group are tested under the control of a group of relays located in the connection circuit which has been selected, two lines, one for each of the sub-groups, being tested simultaneously during the operation of each relay under the control of a pair of relays test. 3. A connector in which the lines are divided into groups and in which the connections are made to the desired line of a group under the control of two groups of relays, one. of these becoming active and preparing the test circuit for all lines in the group and the other comprising a number of relays less than the number of lines in a group, and becoming active to complete the test circuit resulting in 2 .,. the line requested in the group and if the line is free to establish the connection with this line. 4. A retort lines finder claimed to claim 1 or 2 in which at the time of sending a call all the test wires of the lines in the group comprising the calling line are extended to the connection circuit as a result of the operation of a relay specific to the group in question. 5. A line finder as claimed in claim 2 <Desc / Clms Page number 45> in which one of the test relays is specific to the connection circuit and the other common to all the connection circuits. 6. A line finder as claimed 'to claim 1 or 3 in which the conversation wires of the connecting circuit are connected to the conversation wires of the calling line after the called line has been found as a result of the operation of one of the relays of a pair of relays specific to the group. 7. A line finder as claimed in claim 6 wherein the operation of these relays is dependent on the type of test relay which has drawn. 8. A line finder as claimed in claim 1, 2, 4, 5, 6 or 7 in which a free connection circuit is preselected by a relay distributor and in which at the time of the emission of a call a relay, among a group of own relays, each to a group number of lines but common to all connection circuits, functions to start the free connection circuit in search of the calling line in the group. 9. A line finder as claimed in claim 8 wherein the operation of one of these relays prevents the operation of other relays in the group so that a calling line in another group cannot interfere with the operation of the circuit. connection. 10. A connector as claimed in claim 5 wherein each group of lines is divided into two equal subgroups of relays and wherein the group of relays contains a number / equal to the number of lines in a subgroup and a relay. isolated, these relays functioning to establish the connection with any line of the group either alone or in conjunction with the isolated relay. 11..A connector as claimed in claim 3 or 10 in <Desc / Clms Page number 46> which groups of relays operate under the control of counting relays which operate under the action of pulses transmitted by the call dial of the subscriber calling. 12. A line finder as claimed in claim 1 or 2 in which a relay peculiar to each line circuit when in operation removes the inrush polarity of the line and turns off the system when the connection is on the line. point of being established with this line, it operates when the line is found or when the connection circuit cannot find the calling line to prevent other connection circuits from searching for this line. 13. A line finder as claimed in claim 12 wherein if the connecting circuit does not find the calling line this relay draws under the control of a relay common to all lines. 14. A line finder as claimed in claim 1 or 2 wherein the line circuits each include a magnetic shunt line relay, with one winding each connected to the line wires and to opposite polarities, whereby the relay only attracts when the line wires are shorted. and not when only one or these two wires are connected to earth. 15. A line finder in principle as described and shown in the attached plans. 16. A connector in principle as described and shown in the accompanying drawings.