BE406817A - - Google Patents

Description

       

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   The present invention relates to telephone offices and its object is to provide a small autonomous office intended to be installed in towns or villages. An automatic office of this kind is generally called a "rural automatic office" (in English CAX) it can have a capacity of about fifty lines.



  Usually the lines are grouped and they have their ringing circuit either bridged or earthed and subscribers are known by ringing code.



   The possibility of obtaining interurban communications with remote offices is also foreseen.



   A feature of the invention relates to the way in which the subscriber lines and the trunk lines are connected to a feeder composed only of relays and especially to the way in which the search for lines and trunks in the groups of relays playing the role of line seekers and connectors.



   Another feature of the invention relates to a relay distributor which preselects free feeders and in which common test relay equipment is provided to connect a calling line to a free feeder.



   Another characteristic of the invention relates to an improved transmission device repeating the relouant pulses of the calling line.



   Another feature of the invention relates to circuit arrangements by which the feeder allows a local call to be entered and cut off to give priority to both incoming and outgoing long distance calls.



   Another characteristic of the invention relates to a group of common relays which generate the code and to the circuit arrangements relating thereto for the selection and the setting.

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 connection of the various ringing codes to the lines of the called parties.



   A final feature of the invention relates to an alarm device which seizes a trunk to the remote office when a disturbance occurs and which transmits a series of tones on the trunk to identify the disturbance which has occurred.



   These characteristics, and others still, will be better understood from the details of the following description of one of its applications.



   Referring now to the plans comprising figs. 1 to 11 inclusive, it can be seen that these give, in the usual circuit form, sufficient information on the automatic office apparatus to allow the invention to be understood directly.



   Fig. 1 shows a set of group of FGR line finder relays which connect the line and test wires of the different groups of lines and junctions to one of the feeders. The power supply shown is able to interconnect 50 lines. The line groups are divided into five groups of ten lines each and are referred to as the 20, 30, 40, 50 and 60 groups. The relays 122, 132, 142, 152 and 162 are called the control relays. researchers, they connect the test leads of their respective groups to the power supply shown. Relays such as 120-121, 130-131, 140-141, 150-151, and 160-161 relays are intended to connect the line wires of their respective groups to the feeder circuit.

   In the lower left corner of Fig. 1 is shown the LR line circuit of the first group of lines in group 20. A number of stations such as 211, 212, 216 and 217 are shown schematically connected to this line. As we will see, the

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 Line wires from line 21 terminate at armatures 127 and 128 of relay 120 in group 20, while the test wire from this line terminates at armature 129 of relay 122 in group 20. The line wires and test leads are extended through the 159 3-conductor cable, to the output of the feeder where these leads end in the armacures of the relay of the connection group in group 20.

   In the upper left corner of fig. 1 is shown the circuit of the TLR junction of the TR junction line not shown in fig. 10. As we will see, this junction ends at the reinforcements 110, 111, and 112 of the relays 121 and 122 of the researcher. The wires of the junction are also connected to the output of the feeder in a manner identical to that described for line 21. Lines 22, 23, 24, 25, 26 and 27 and junctions 28 and 29, marked with a brace, lead to armatures of the group 20 finder relays to connect these lines to the feeder circuit. The trunks and subscriber lines of group 30 and other groups are connected in an identical manner.



   Fig. 2 shows a group of FUR finder relays that connect the line of any selected group to the feeder control circuits.



   Figure 3 shows a group of CUR connector relays which connect the feeder circuit to any one of the lines called in any group called according to the selection made by the connector relays.



   Fig. 4 shows a group of relays of the CGR connector which connect (in conjunction with the CUR relays) the output of the feeder to any of the lines in any of the groups. At the right end of fig.4 is shown the circuit of line 33 with a number of stations connected to it. Line 33 is

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 connected to the power supply input as shown schematically by the cable: ':. 1 three conductors terminating at armatures 457, 458 and 459 in fig.1. All the junctions of all subscriber lines of all groups terminate the feeder output in the same manner as shown for line 33.



   Fig. 5 shows a distributor composed only of intended relays. the preselection of a free aligner In the upper left corner of fig. 5 are shown the LSR feeder selection relays which control the selection of a free feeder and which control the operation of the feeder connection relays, such as 5100, to connect such a feeder to the relays. group selection GSR in the common distributor. GSR Group Select Relays operate to seek out the calling group while Relay 550 operates when the calling line is found by the Seeker Relay.

   In the lower left corner of fig. 5 are shown the control relays of the ACR distributor, which control various operations which will be described below. Each row group has a starter wire, such as starter wire 137, which extends from each row circuit group to a terminal, such as terminal 20, shown in the lower portion of FIG. 5.



   The starter wire, corresponding to the starter wire 137, in group 30 would terminate at terminal 30, and the other starter wires of the other groups would terminate at the correspondingly numbered terminals.
Fig. 6 shows a group of control circuit relays in the same feeder.



   Fig. 7 shows another group of control circuit relays in the same feeder.

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   Fig. 8 shows another group of control circuit relays in the same feeder.



   Relay S1 in fig.8 is designed to connect counting relays 820 to 880 inclusive, to the CGR connector relays, fig.4 =.



   Relay S2 is designed to connect the counting relays to the relays of the CUR connectors in fig. 3. Relay 890 is designed to connect the transmitter of code C1 to the counting relays.



   Fig. 9 shows the transmitter C1, composed only of relays, and a call machine RM.



   Fig. 10 in its upper part shows the junction TR which terminates in position 20 of group 20 of ali-; Slowness (fig.l).



   This junction is connected through the translator coils RC and RC1 and wires 1054 and 1055 to the TC junction circuit to the remote office. This particular TR junction circuit is connected to an alarm transmitter shown in fig. 11.



   Fig. 11 shows an AS alarm transmitter for transmitting a series of tones over the TR junction to the remote office if a fault occurs.



   It will now be assumed that the subscriber 216 wishes to call the subscriber 331. When the subscriber 216 picks up a circuit closes and causes the attraction of the line relay 172 by the following circuit: positive, armature 178, relay 172 line of the subscriber, frame 177, relay 173, negative. The relay 172 to the armature 179 disconnects the wire 156 of the cut-off relay 171 at its rest contacts and at its working contacts it earths the wire 156 which is extended through the 3-conductor cable 159 of fig.



  4 to occupy the calling line at the connector terminals, to the armature 180 it connects the cutout relay 171 to

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 frame 129 through frame 174 day mark line 21 as a calling line in the finder. At the armature 181 the relay 172 earths the starter wire 137 thereby marking in the distributor the group in which the calling line is incorporated, Following the earthing of the starter wire 137 by the relay 172 a circuit causing the attraction of relay 587 is constituted by: wire 137, terminal 20, resistor R, armature 5004, lower winding of relay 587, .tif.



   When this call is made, the LSR feeder selection relays in fig. 5 have pre-selected the first feeder. Although one or more feeders are free, the relay 588 marking the occupation of all the feeders is energized by the intermediary of the common occupancy wire of all the feeders 629 and the positive taken to the circuits. free feeders. Relay 588 is kept attracted by the position taken to the circuits of the free feeders and therefore does not release until all the feeders are occupied. Relay 588 to armature 5001 closes a circuit which causes relay 585 to pull as armature follows; earthing 5001, relay 585, armatures 536, 530, 524, 518 and 511, lower winding of relay 50. negative.

   Relay 501 is kept attracted by this circuit as long as the first feeder is pre-selected.



   Since the first feeder u has been pre-selected and since the feeder relay 501 is attracted to the attraction of the start relay 587, in this case, closes the feeder relay 5100 feed circuit as follows: positive, armatures 595, 599,593 and 507, relay 5100, negative. At armature 596 the relay

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 387 closes a circuit, via the armature 5002, which causes the attraction of the relay 591 and at the armature 598 closes a circuit 3 through its lower winding independently of the armature 5004 :. Relay 591 pulls and closes the circuit of relay 590.

   The relay 590, after a certain time attracts and the armature 5005 closes the supply circuit of the relay 589 as follows: positi armatures 596 and 5005, relay 589, negative. At armature 5002, relay 589 opens the circuit of relay 591 which, after returning to the rest position, causes the vibration of the weighted spring 5006 which opens and closes the circuit of relay 590. As a result of its delay in releasing the relay 590 remains attracted during the vibrations of the reso: 5006. At the armature 5101 the relay 5100 closes the attraction circuit of the relay 549 as follows: positive, armature 5101, armature 576, relay 549, negative.



   Relay 549, at armature 581, closes the supply circuit for the group selection relays, and in this case, closes the attraction circuit of the selection relay of the first group 543 as follows: positive , armatures 581, 577,573, 568, 563, 558 and 553, relay 543, negative.



  Relay 543 at armature 552 locks on itself, at armature 553 it opens its original attraction circuit and closes the circuit of relay 544; and to armature 554 it connects the negative, through the upper winding of group test relay 548, to the start il of finder 137 which is grounded because the call is from a subscriber of group 20.



   Group selection relays 543 to 547 inclusive are slow and they only attract after a short time and close their blocking circuit before closing the other armatures. Suppose for a moment that another subscriber in another group is transmitting

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 Therefore, inrush and flood, finder 137 start wire is not grounded and group 548 test relay is not drawn. In the event that wire 137 is not earthed, relay 544 attracts after a certain time via the following circuit: positive, armatures 581, 577, 573, 568, 563, 558 and 553, relay 544 , negative.

   The relay 544 to the armaturE 556 opens the blocking circuit of the selection relay of the first group 543 and:. the frame 557 closes its blocking circuit; armature 558 it opens its original attraction circuit and closes an attraction circuit for the selection relay of the third group 545, and armature 559 it connects relay 548 to the start wire of the finder common to all subscribers of group 30. In an identical manner, relays 545, 546 and 547 attract in series, each of them unblocks the previous relay and connects the starting wire of the researcher of the group to which they are associated with the winding top of relay 548 until the group of the calling line has been found or the last group has been reached.



   When the calling line group is found the ground of the starter wire, such as 137, loops the pull circuit of relay 548 through its top winding. The relay 548 by attracting, opens to the armature 577 the circuit for attracting the selection relay of the following group before it operates and closes its blocking circuit; armature 576 it opens the circuit of relay 549, at armature 578 it closes its blocking circuit to the earthed armature 5101, and at armature 575 it closes the attraction circuit of the researcher control relay of the selected group, in this case relay 122, as follows: positive, armatures 575, 570, 565, 560,

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 555, 551 and 5102, wire 182, relay 122, negative.

   Relay 122 to armature 125 closes its own blocking circuit through earth wires 188 and 214 and to armatures 123 and 124 it connects relays 120 and 121 to wires 190 and 189. its upper armatures such as armatures 110, 113 and 129 the relay 122 connects all the test wires of the group of 20 lines to the test armatures associated with the researchers' relays shown in fig 2. In this case, since the line 21 is calling, the armature 129 connects the negative to armature 218 through wire 197, armatures 129, 180 and 174 and relay 171.



   In the distributor of fig. 5 relay 549 releases after a certain time and at armature 579 opens the blocking circuit of relay 543 which releases, at armature 551 it opens the original attraction circuit of relay 122 and at armature 554 it opens the original drive circuit of relay 548. It should be noted that due to the delay in attracting the selection relays to group the relay 544 will not have time to attract and close its circuit. blocking before the group 548 test relay, having found the calling group, attracts and opens the circuit from relay 544 to its 577 armature.



   As soon as relay 549 releases, the attraction circuit of relay 210 of the first finder closes as follows: positive, armatures 5101, 576, 580, 5F3, 5107, wire 213, armatures 211,221, 231,241, 251, 261, 271, 281, 291 and 201, relay 210, negative. The seeker relays are also slow, they work in the same way as described for the distributor group selection relays. At armature 212, relay 210 closes its blocking circuit via the earthed wire 188. At armature 211, relay 210 opens its circuit.

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 Original bake of attraction after its olocage circuit is closed and it connects the grounded starter wire 213 to the relay of the second seeker 220.



  In case the calling line is 21, 31, 41, 51
218 or 61 the armature pull closes the line test relay 550 pull circuit in the distributor. In order to describe the search operation by the searcher relays, it will be assumed for a moment that lines other than the one in question are in the call position.



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In this case the relay of the second finder / is attracted by the wire is to earth 213 and by the intermediary of the arr.: Ature 211, it is blocked at the armature 222. the armature 223 the relay 220 opens the blocking circuit of the relay of the first seeker 210. The relay 210 of the first seeker after a certain time is released and at the armature 211 closes the circuit for attracting the relay of the third seeker 230. In an identical manner to that which has just been described the relays of the researchers remaining drawn in series each of them prepares a circuit towards the relay of the preceding researcher and extends the test conductor of the line with which they are associated towards the winding of the relay line test common 550 until the calling line is found.



   When the calling line is found the negative is connected, through the winding of the calling line cutoff relay, to wire 299 for powering the common line test relay 550 and the line cutoff relay. serial subscriber. Since in this case the calling line is line 21, it will be remembered that the relay 122 is attracted and blocked in the working position to prepare the circuit of the group finder relay 120 and to connect the negative

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 of the winding of the relay to the wire 197 through the intermediary of the armature 129. It follows that when the relay 210 of the first researcher attracts and operates its armature 218 the attraction circuit of the common line test relay is closed in series with the cut-off relay 171 of the subscriber line.

   The relay 550 attracts before the relay of the second seeker 220 has had time to attract completely, it performs the following functions: - the armature 583 disconnects the positive of the wire 213 to prevent the complete attraction of the relay 220, it completes its blocking circuit by its upper winding; at armature 584 it closes a circuit through the upper winding of starter relay 587 to maintain this relay in the operated position after the marking positive has been removed from starter wire 137; at armature 582 it closes the attracting circuit of the group 120 seeker relay as follows: positive, armatures 582 and 5108, wire 219, armature 215, wire 190, armature 123, relay 120, negative.



   Cutoff relay 171 draws in series with common line test relay 550 and at armature 176 keeps its circuit closed regardless of armatures 180 and 174, at armature 177 it disconnects coil 173 from the top wire of the line , at armature 178 it closes the attraction circuit of relay 170 and opens the circuit of line relay 172. The relay 170 by attracting, at armature 174 opens the original circuit of attraction of the cut-off relay 171 and at armature 175 it disconnects the positive from starter wire 137. Line relay 172 when releasing, at armature 179 disconnects the direct positive from wire 156 and substitutes the positive through the lower winding of the wire. relay 550 so that wire 156 remains grounded to occupy the line at the connector.



   The relay 120, by attracting, to the armatures 127 and 128 closes the attraction circuit of the line relay 690 by

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 the next circuit. positive, line relay 690, armature 664, wire 279, armature 216, wire 199, armature 127, calling party loop, armature 128, wire 198, armature 217, wire 289, armature 662, spool 692 , negative.



  Line relay 690 pulling, armature 691 closes the attraction circuit of pulse relay 640 com :: e follows: positive, armatures 691 and 633, resistor 643, relay 640, negative. A supply circuit of the relay 600, slow to release, closes by the armature, earthed 691 through the springs controlled by the armature 634. The relay 600 to the armature 601 closes the circuit of the relay 610 , to armature 602 it connects a direct positive to wire 299 and to armature 603 it connects positive 1 through the normally closed springs controlled by armature 607 to wire 219 to keep relay 120 attracted. Relay 610, by pulling, to armature 611 grounds wire 188 to maintain the blocking circuit of relays 122 and 210.

   At armature 612 the relay 610 prepares the attraction circuit of the junction test relay circuit 660, at armature 613 it closes the circuit of relay 620 and also closes a circuit through armatures 686 and 678 through the upper coil of relay 630. Relay 620, to the armature 621 connects the invitation to be transmitted to the subscriber's loop through the following circuit: to be transmitted through wire 648 and the armatures 621,661 and 681, wire 706, armatures 792 and 783, wire 708, armature 672, TC capacitor, wire 693, through the talk capacitor, armatures 664 and from there through the circuit described previously through the subscriber loop.

   At armature 626, relay 620 removes one of the earth connections of the common occupancy wire of all feeders 629 and earths the guard wire 616 to cause the preselection of a

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 feeder free by the distributor. The relay 630 by attracting, connects to the armature 631 the negative through the resistor 609 to the conversation wire 289 through the armature C62 to improve the circuit for sending the pulses and to the armature 634 it closes a new circuit to maintain relay 600 as follows: positive, armatures 667,642 and 634, relay 600, negative.



   When the guard wire 616 is earthed following the attraction of the relay 620 a circuit closes to cause the attraction of the selection relay of the second feeder 502, in series with the relay 586, by the arma - ture 510. At armature 593, relay 586 opens the circuit of relay 5100 which releases after a certain time; and to the armature 594 closes the circuit of the earthed armature 596 to cause the attraction of the relay 591. The selection relay of the feeder, by attracting, to the armature 513 prepares the circuit of the 5100 feeder connection relay, at armature 517 it closes its blocking circuit through its lower winding and at armature 518 it opens the blocking circuit of the selection relay of the first feeder 501.

   The feeder selection relay 501 at armature 510 opens the original circuit for attracting relays 502 and 586. Relay 586 releases after a certain time but relay 502 remains attracted by its lower winding. Relay 5100 by releasing at armatures 5102 to 5106 opens the circuits of the group finder control relays, at armature 5101 it opens the blocking circuit of relays 548 and 550, thereby causing the release of these relays.



   At armature 584, relay 550 opens the circuit of the upper bearing of the starter relay 587 and this latter releases at this moment if no other line is called.

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 lante in group 20. The relay 591, attracting by the armature 594. operates its vibrating iras 5006 and closes a circuit switch attracting the relay 590 by the armature to the earth 596. The relays 590 and 589 remain attracted while searching for the calling line due to vibrations of the arm 5006.



   In the event that the second feeder is occupied, the positive of the guard wire 616 ′ closes the attraction circuit of the selection relay of the feeder 503 and of the relay 586, in series. In the same way as that described above for the selection relay of the second feeder 502, the selection relays of the feeders 503,504, 505 and 506 operate in series and open the blocking circuit of the previous feeder selection relay and connect the grounded guard wire from the feeder associated with them to the next feeder selection relay until another feeder is found free or all feeders are occupied.



   In the event that no other call is pending the starter relay 587 releases and at armature 596 opens the circuit of relays 591,590 and 589. Relay 586 by releasing, when a free aliruentor is found, to the ar - mature 593 prepares the attraction circuit of the feeder connection relay identical to the 5100 feeder connection relay in the second feeder. However, if another call is pending the circuit through the lower winding of relay 587 remains closed through the same starter wire as the 137 starter wire and grounded resistors such as R2. , R3 and R4 and therefore relay 587 will not release.



  In this case, when relay 586 releases, at armature 593 the attraction circuit of the power supply connection relay identical to relay 5100 closes, and at armature 594

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 opens the circuit of relay 591 causing the vibration of the weighted spring 5006 and the interruption of the circuit of relay 590. The feeder connection relay identical to relay 5100 in the free feeder attracts and closes the circuit of relay 549 o to cause the operation of the dispenser in the manner previously described.



   In the event that the calling line has not been found within a given time the device in time, controlled by relays 589,590 and 591, will be started to cause the selection of another free feeder by the distributor. In this case if the calling line has not been found when the weighted spring 506 stops vibrating the relay 590 will release and at the armature 5005 will open the circuit of the relay 589 and close the attraction circuit of the selection relay feeder 502 and relay 586, in series, as follows: positive, armatures 596,5005, 5003, 5000, 597, 509, 539, ground wire 616, armature 510, upper winding of relay 502, relay 586, negative.



  The relays 586 and 502 attract to cause the distributor to preselect another free feeder in the manner previously described. The free feeder connection relay, such as 5100, will release as a result of pulling relay 586 so that the feeder relay and distributor relay circuit will be open.



   In the event that all the feeders are occupied, the positive will be cut from the common occupancy wire of all the feeders 629 which will result in releasing the relay 588. At the armature 5001, the relay 588 opens the blocking circuit. connection relay of the feeder and relay 585, it closes the circuit for attracting relay 591 by the armature 5002.



   The relay 591 attracting, to the spring 5006 closes at

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 again the circuit of relay 590 and this one at the armature 5005 again closes the circuit of the relay 589. The relay 589, at the armature 5002 opens the circuit of the relay 591. The relay 591 by returning to the position of idle vibrates the spring 5006 and intermittently interrupts the circuit of relay 590. Relay 590 does not immediately return to idle due to its delay in release but because the vibrations of spring 5006 decrease in amplitude. the circuit of relay 590 is open for a sufficient time to allow the relay to return to rest..1. armature 5005 relay 590 opens the circuit of relay 589. After a certain time the relay.



  589 releases and armature 5002 again closes the circuit of relay 591. Relay 591 attracts again and the previous cycle of attraction of relays 590, 589 and 591 continues until a feeder becomes free. When a feeder becomes free, the earth is again connected to wire 629 to attract relay 588. At armature 5001, relay 588 opens the circuit of relays 589, 590 and 591, which allows them to return to rest if no call is pending, and closes the pull circuit of the feeder selection relay 501 and relay 586, in series, as follows: positive, armatures 5001 and 592, upper winding of relay 501, winding of relay 586, negative.

   At armature 593, relay 586 opens the circuit of the feeder connection relay such as relay 5100 and at armature 594 it closes the attraction circuit of relay 591 if a call is pending. 501, by attracting, to the armature 511 closes its blocking circuit through the winding of the relay 585 which causes its attraction. In the event that the first feeder is busy, the positive will be placed on the guard wire 616 and the selection relay of the second feeder 502 and the relay 586 will draw in series in the way already

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   described..¯ armature 517 relay 502 closes its blocking circuit through its winding: lower ent in series with relay 585 and armature 518 it opens the blocking circuit of relay 501 which releases.

   If the second feeder is busy the positive of the ground wire 616 'closes the pull circuit of the third feeder selection relay 503 in the same way. Relays 503, 504, 505 and 506 draw in series, each of them opening the blocking circuit of the preceding feeder selection relay and connecting the guard wires of their associated feeders to the upper windings of the feeder relays. selection of the feeder until a free feeder is found. When a free ali-entor is found the absence of positive polarity on the ground wire prevents the attraction of the alientor selection relays and opens the circuit of relay 586 which thereby releases.



   When the calling subscriber hears the invitation to send, he emits the digit of the desired number. As a result of the operation of the CD transmission device of the calling line under the action of the first digit emitted, the circuit, extending through the conversation wires marked in reinforced lines to relays 690 and 692, is interrupted. depending on the value of the digit emitted. When the transmission circuit is interrupted, relay 690 releases and at frame 691 opens the circuit of pulse relay 640. Pulse relay 640 therefore releases, at armature 641 it opens its circuit. blocking, at armature 642 it opens the circuit of relay 600 which remains attracted and it closes the circuit of attraction of relay series 650 by armature 623.



   Relay 650 is slow and remains engaged while sending pulses. Relay 650 in attracting, to armature 651 connects the negative through resistor 609 to improve the pulse circuit, to armature 652 it

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 closes the attraction circuit of relay 710 as follows: positive, armatures 667, 642, 623, 635 and 652, wire 733, armature 703, relay 710, negative; on armature 653 it closes its blocking circuit via armature 636 through the lower coil of relay 630 and on armature 654 it closes the attraction circuit of relay Sl, fig. 8, as follows : positive, armatures 638, 654 and 671, wire 705, armatures 782 and 791, wire 765, relay S1, negative.

   Relay S1 to armature 805 fires its blocking circuit as follows: positive, armature 625, wire 329, armature 793, wire 761, armature 873, armature 805, relay S1, negative. When line relay 690 re-attracts at the end of the first pulse a circuit closes for re-attraction of pulse relay 640 as follows: positive, armature 691, wire 725, armature 711 and 701, wire 726, relay 640, negative .

   At armature 641 the pulse relay 640 again closes its blocking circuit through resistor 643, at armature 642 it opens the circuit of the 650 series relay, it removes the positive of wire 733 and closes the wire again. circuit of relay 600 before the latter relay has had time to release, following the removal of the positive of wire 733 the short-circuit of the lower winding of relay 700 is removed; as a result, the relay 700 attracts in series with the relay 710 as follows: positive, armatures 653 and 637, wire 697, armatures 722 and 714, lower winding of relay 700, relay 710, negative. Relay 710 is kept drawn into this circuit.



  The relay 700 by attracting, the armature 701 opens the circuit of the relay 640 which now remains attracted by its blocking circuit. At armature 703 the relay 700 opens the original attraction circuit of relay 710 and prepares the attraction circuit of relay 730 through the upper winding of relay 720. At armature 704 the relay 700

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 Connect the 697 grounded wire to the 716 wire to attract the 870 count relay through the 881 armature.



   At armature 875, relay 870 closes its blocking circuit, at armature 877 it closes the attractor circuit of counting relay 880 by the positive taken from wire 697.



  The relay 880 by attracting, at armature 881 opens the original circuit of attraction of relay 870 and at armature 882 it closes its blocking circuit.



   Under the action of the second pulse in the series, relay 690 releases again and again opens the circuit of relay 640 which releases likewise. At armature 342 the relay 640 again closes the circuit of the 650 series relay before the last relay has had time to release, and also it grounds the wire 733 to cause the pull of the relay 720 by its winding upper, in series with the upper winding of the relay 700. The relay 700 is kept attracted by this circuit and the relay 720, by attracting, to the armature 722 opens the blocking wax of the relay 710 which releases. Relay 710 on releasing, at armatures 713 and 714 closes the blocking circuit through the lower winding of relay 720 to the grounded wire 697.



   After the second pulse, relay 690 attracts again and this time closes the attraction circuit of relay 640 by: positive to armature 691, wire 725, armatures 721 and 701 and wire 726. To armature 641 relay 640 again closes its blocking circuit and at armature 642 it again closes the circuit of relay 600 and removes the positive of wire 733. As a result of the removal of the positive of wire 733 the through circuit the upper coil of relay 700 opens and this relay releases.

   At armature 701, relay 700 opens the attraction circuit, mentioned last, of relay 640 and

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 prepares the auxiliary action circuit of the same relay; at armature 703 it prepares again the circuit of relay 710 and at armature 704 it disconnects the positive of wire 716 and connects the positive to wire 709 to cause the pulling of counting relay 860 via the armature 874.



  The counting relay and the armature 864 closes its blocking circuit, at the armature 865 it opens the blocking circuit of the relay 870. The counting relay 870 releases and on the armatures 874 and 877 opens the original circuits of the relay. attraction of relays 860 and 880 respectively, but the relays will not release at this time because they are kept attracted by their blocking circuits, previously indicated.



   Under the action of the third pulse, relays 690 and 640 release and the last one at armature 642 again grounds wire 733. Since the relay 700 is released the attraction circuit of the relay 710 is closed by the earthed wire 733 and this last relay by attracting opens to the armatures 713 and 714 the blocking circuit of the relay 720 which releases. At armature 711, relay 710 again prepares the attraction circuit of pulse relay 640. At armature 722, relay 720 short-circuits the lower winding of relay 700 via armatures 714 and 703.



   After the third pulse the line relay attracts and at armature 691 closes the attraction circuit of relay 640. At armature 642 relay 640 disconnects the positive of wire 733 to eliminate the short circuit of the wire. upper winding of relay 700. Relay 700 attracts 70 @ now in series with relay 710 and at the armature it closes the attraction circuit of the counting relay 850 by the earthed wire 697 and via the armature operated 863.



  Relay 850 to armature 854 closes its blocking circuit

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 ria armature 845 and grounded wire 729, and at stop 855 it opens the relay blocking circuit
860 count that releases.



   The preceding cycle of operation of the pulse repeater relays 710, 700 and 720 continues until the end of the series of pulses. That is to say that at the beginning of each odd pulse the relay 710 attracts and the relay 720 releases and at the end of each odd pulse the relay 700 attracts and earths the wire 716 to attract the counting relay having its circuit prepared by the counting relay which has been operated. At the start of each even pulse the relay 720 attracts and causes the release of the relay 710 and at the end of each even pulse the pulse relay 700 releases and earths the wire 709 to attract the counting relay having its own. circuit prepared by the last metering relay that was operated.

   The attraction circuit of the impulse relay 640 passes through the armatures 701, 711 and 721 so that for "light" impulses (weak impulses received on weakly isolated lines) the circuit of the relay 640 cannot not be closed until relays 710 or 720 attract, thereby ensuring perfect operation of the pulse repeater relays. The pulse count relays 850, 840 and 830 respectively operate under the action of the third, fourth and fifth pulse of the series.



   Under the sixth pulse, the counting relay 820 attracts through the earthed wire 709, via the armature 833, to the armature 825 it closes its blocking circuit through the wire 729, to the armature 824 it closes the guard relay circuit S1 in position operated by the earthed wire 761 and to the armature 826 it opens the blocking circuit of relay 880 since relay 830 is also attracted at this time. Relay 880 when releasing, to the armature

  <Desc / Clms Page number 22>

 881 again prepares the circuit of count relay 870.



   Under the seventh pulse of the series, relay 870 re-attracts, closes its blocking circuit at armature 875 and closes the blocking circuit of relay 830 at armature 876. Relay 830 releases and at armature 836 closes the re-attraction circuit of relay 880 via wire 697 and via armature 877. Relay 880 attracts and closes its blocking circuit at armature 882 and armature 881 it opens the original attraction circuit of relay 870. Subsequent pulses in the series cause relays 860, 850 and 840 to be drawn in succession as previously described. The following table shows the relationship between the transmitted pulses, the pulse repeater relays, the pulse counting relays and the circuits that these control for the different transmitted digits.



   Pulse table.
 EMI22.1
 
 <tb>



  NOT <SEP> of <SEP> im- <SEP> Relay <SEP> repeated <SEP> Relay <SEP> ofThe <SEP> 1st <SEP> chif. <SEP> The <SEP> 2nd <SEP> chif. <SEP> The <SEP> 3rd <SEP> ch:
 <tb>
 <tb>
 <tb> impulses. <SEP> teurs <SEP> pulse-count <SEP> issued <SEP> prepare <SEP> issued <SEP> prepa- <SEP> select
 <tb>
 <tb> sions <SEP> attracted. Attracted. <SEP> on <SEP> wax. <SEP> of <SEP> re <SEP> on <SEP> wax. <SEP> the <SEP> son
 <tb>
 <tb>
 <tb> relay <SEP> of <SEP> relay <SEP> of <SEP> ring-
 <tb>
 <tb>
 <tb> (IF <SEP> operated) <SEP> (S2 <SEP> operated) <SEP> laughs.
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>



  1 <SEP> 710. <SEP> 700 <SEP> 880.870 <SEP> 310 <SEP> C1
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 2 <SEP> 720 <SEP> 880 <SEP> 860 <SEP> 422 <SEP> 320 <SEP> C2
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 3 <SEP> 710 <SEP> 700 <SEP> 880 <SEP> 850 <SEP> 432 <SEP> 330 <SEP> C3
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 4 <SEP> 720 <SEP> 880 <SEP> 840 <SEP> 442 <SEP> 340 <SEP> C4
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 5 <SEP> 710 <SEP> 700 <SEP> 880 <SEP> 830 <SEP> 452 <SEP> 350 <SEP> C5
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 6 <SEP> 720 <SEP> 820 <SEP> 830 <SEP> 462 <SEP> 360 <SEP> C6
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 7 <SEP> 710 <SEP> 700 <SEP> 820 <SEP> 880 <SEP> 870 <SEP> 800 <SEP> 432 <SEP> 370 <SEP> C7
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 8 <SEP> 720 <SEP> 820 <SEP> 880 <SEP> 860 <SEP> 380 <SEP> C8
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 9 <SEP> 710 <SEP> 700 <SEP> 820 <SEP> 880 <SEP> 850 <SEP> 760 <SEP> 390 <SEP> Cg
 <tb>

  
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 10 <SEP> 720 <SEP> 820 <SEP> 880 <SEP> 840 <SEP> 750 <SEP> 300 <SEP> C10
 <tb>
 

  <Desc / Clms Page number 23>

   ., before sending the last 1 # pulse of the series, relay @ 50 releases and at armature 652 opens the circuit = 'impulse from relays 700, 710 and 720. At armature 653, relay 650 opens blocking circuit, through its lower coil of relay 630, and removes the positive from wire 697 to open the blocking circuit of relay 880.



    At setting 654, relay 650 opens the initial traction circuit of relay 31 and at the rest contact of setting 654 it closes the attraction circuit of the control relay of the selected connection group, c 'ie relays 760, 750 or 600 depending on the number emitted.



   If the number received is the number 1, the relay 650, returning to idle, opens the relay circuit 654 to the armature 654 and the latter, releasing the armature 806, opens the blocking circuit of the counting relay 870. At the armature b53 relay 650 disconnects the positive of wire 697 to release relay 880. Relays 870 and 880 are released without having performed any useful operation.



  This circuit arrangement is intended to prevent blocking of the system by a preliminary pulse.



   In the case where the first digit is the digit 9, relay 650 closes the attraction circuit of relay 760 as follows: positive, armatures 638, 654, 685, 677, wire 735, armatures 823, 852, and 817 , wire 778, winding of relay 760, negative. The number 9 is emitted only if it is desired to obtain the connection to another office.



  This case will be explained in detail below.



   If the first digit is 0, relay 650 closes the attraction circuit of relay 750 as follows: positive to armature 638 via the circuit already described to wire 735, armatures 823, 842, and 815, wire 777, relay 750, negative. The number 0 is only emitted if you want to take a junction to a different office and

  <Desc / Clms Page number 24>

 the operation will be described more fully below.



   If the first digit e @ is is 7, relay 650 closes the attraction circuit of relay 800 as follows: positive to armature 638, through the circuit already described to wire 735, armatures 823, 872 and 819, relay 800, -negative. Relay 800 closes the group connector relay 432 circuit and prepares for ringing the lines of that group or group of 30 by the second group of 10 codes. It can therefore be seen that there may be around twenty subscribers on each of the lines of group 30, the number 3 being used to call the first 10 subscribers on a line of the group of 30; while the number 7 will be used to call the last 10 subscribers on a line of this group. These operations will be described in more detail below.



   If the first digit is 2, 3, 4,5 or 6, relay 650 closes the circuit for attracting the control relay of the connection group according to the number emitted.



  In the present case, assuming that the first digit emitted is 3, the control relay of connection group 432 will be attracted by the following circuit: through armature 638 and from there by the circuit already described to wire 735, armatures 823, 851 and 816, wire 483, relay 432, negative. The control relay of the connection group 432 by drawing, to the armature 435 closes its blocking circuit via the grounded wire 329. In the upper armatures of the relay 432 the test leads are connected to the wires. relay connectors through the windings: of all the cut-off relays of the group of 30 in the same way as shown for the connection of wire 494 through the armatures 437 and 479 to the relay winding switch 471 associated with line 33.

   At armature 436, relay 32 closes the attraction circuit of relay 790 as follows: positive, armature 436, wire 487,

  <Desc / Clms Page number 25>

   frame 807, wire 734, relay 790, negative.



   Relay 790 at armature 793 disconnects the positive of wire 761 thereby opening the blocking circuit of relay Si and at armature 794 it closes its blocking circuit as follows: positive, armatures 625, 668 and 676 , wire 6J8, springs controlled by armature 786, armature 794, relay 790, negative.



   Relay S1 when releasing, at armatures 808, 809 and 814 818 inclusive, disconnects the control relays of the pulse counting relay connection group and at armature 806 it disconnects the positive of wire 729 to open the control circuit. blocking of pulse counting relays that release.



   The equipment is now ready to receive the second digit of the called number and as previously described line relay 690 and pulse repeater relay follow the second set of pulses. The relay 650, the pulse repetition relays 700, 710 and 720 and the counting relays operate as already described and according to the table given previously. In this case, however, instead of relay 650 which completes the attraction circuit of relay S1, it is the circuit of relay S2 which closes as follows: armatures 638, 654 and 671, wire 705, armatures 782 and 791, wire 759, relay S2, negative. At armature 829, relay S2 closes its blocking circuit to grounded wire 329 through armature 781 and wire 758.

   The pulse counting relays attract in the same way as described above and prepare circuits to the relays of the CUR connectors according to the numbers emitted.



   After the last pulse of the second series is received, relay 650 releases and closes the pull circuit of the selected connector relay. If we admit that

  <Desc / Clms Page number 26>

 the second digit emitted is 3, ¯ \ .land relay 650 releases it closes the attraction circuit, of connector relay 330 as follows: positive, armatures 638, 654, 685, 677, wire 735, armatures 823, 851 and 869, wire 3 of cable 815, relay 330, negative. At armature 331, relay 330 closes its blocking circuit via the grounded wire 329, and at armature 332 it closes the circuit for attracting relay 780 via wire 325, armature 848, wire 776, relay 780, negative.



   At armature 781, relay 780 opens the blocking circuit of relay S, 0 armature 785 closes its circuit.
2 clean blocking fired via ground wire 747 through armature 772, and to armature 786 it transfers the blocking circuit of relay 790 from wire 698 to wire 735. Relay S2 on releasing , at armature 839 opens the blocking circuit of the pulse counting relays, at armature 848 it opens the original drawing circuit of relay 780 and at the other armatures, it disconnects the relays from the connectors of the control relays. pulse counting. The pulse count relays thereby release and the equipment is ready to receive the third digit of the called number or call digit.



   The called subscriber is then called by various combinations of long and short rings. Subscribers 1 to 5 are called by a long ringing sound provoked by the positive placed on wire M1 followed by a series of short strokes caused by positive impulses sent on wires C1 to C5 to attract relay
6 call 810. The subscriber / is called by 2 long ringing rings caused by the positive placed on the M1 and M2 wires to operate the call relay 810 for sending 2 long periods.

   Subscribers 7 to 10 on the same line are called by a series of short rings caused by positive impulses on the wires C7 to C10 followed.

  <Desc / Clms Page number 27>

 by a COUD Ions p rovated by the positive placed on wire M2 to operate relay 810. Subscribers 11 to 20, in the case where there are 20 subscribers on a single line, are called by a series of blows of the ringing tone. short caused by positive pulses on wires C1 to C10 inclusive, to operate relay 810.

   In the particular example entered the first digit to be sent to call subscribers 11 to 20, inclusive, is the number 7, which, following the attraction of the counting relays, causes the attraction of the relay 800 which opens the M1 and M2 wires as well as selects a connection group control relay from the group of 30.



   Under the acticn of the third digit the relays 690 and 640 follow the pulses as described above. The relay 640 causes the attraction of the relay 650 and the induction repeater relays as described previously. In the present case however; relay 650 to armature 654 opens the blocking circuit of relay 790 instead of closing the circuit of relay Si or relay S2. Relay 710 pulling at the start of the first pulse of the third train, armature 712 closes the called line test circuit to determine whether it is free or busy.

   In the case where the called line is occupied the positive is connected to the armature 479 and this positive will be extended by the armature 437; wire 494, armature 338 and 308, wire 399, springs controlled by armature 753, wire 723, armature 673, springs controlled by armature 683, wire 719, armature 784 and 702 , wire 727, occupancy relay 670 to negative to attract this last relay.



   In the event that the called line is free, the relay 700 pulling at the end of the first pulse transfers the called line test lead from the busy relay 670 to the line test relay 680 at the frame 702.

  <Desc / Clms Page number 28>

 



  In the case where the called line is free, the relay 680 attracts by the circuit described preceded in series with the cut-off relay 471 towards the negative. Relay 471 also pulls along this circuit. Relay 790 releases as soon as its blocking circuit is opened by the attraction of relay 650, at arrature 796 it prepares the blocking circuit of the pulse counting relays via the earth wire 729. Pulse counting relay: attract received pulses under the action in the same way as that described previously.



   The relay 680 by drawing, to the armature 683 connects a direct positive to the test lead of the called line instead of the positive through the upper winding of the relay 680, the armature 684 completes its blocking circuit. cage through its lower winding via armatures 668 and 625, armature 686 it opens the circuit passing through the upper coil of relay 630.



   The cut-off relay 471, by attracting according to the circuit described above, to the armatures 477 and 478 disconnects the relays 473 and 472 and on contact with the armature 478, it closes the attraction circuit of the relay 470. Connecting a direct positive to the called line test lead at armature 683 marks the line busy for all other calling subscribers. To armature 476, relay 471 connects this direct positive via wire 457 to mark the line to the occupation at the terminals of the relays of group researchers and unit researchers,
At the end of the pulse train relay 650 releases, at armature 653 it opens the blocking circuit through the lower winding of relay 630 and cuts the positive of wire 697.

   Releasing relay 630 to armature 639 connects positive to generator start wire 657 via armatures 745 and 688 to attract generator start relay 900 of fig. 9 and to the frame

  <Desc / Clms Page number 29>

 632 it closes the attraction circuit of the line relay of connection group 430 as follows: positive, armatures 632 and wire 31 @, armatures @ 33 of the relay attracted from the searcher 330, wire 55, armature 433 of the group control relay of connection drawn 432, winding of line relay in connection group 430, negative. To armatures 438 and 439, the relay connects the conversion wires of the called vine to relays 740 and 774 via the reinforced lines and the rest contacts of armatures 751 and 752.



   Relay 900 at armature 97C takes a negative at armature 984 Day make relay 890 attract, at armature 977 it closes the attraction circuit of slow relay 939, at armature 976 'it closes the attraction circuit of the relay 960 and to the armature 978 it temporarily earths the alarm wire of the generator which extends towards fig. 11. The relay 8; 10 by attracting,; .. the armature 892 loops its blocking circuit to the positive connected to the blocking wire H of the armature 932, and to the armature 891 it closes the circuit of. attraction of relay 730 as follows: 'positive via armature 936, wire D, armature 891 and wire 737.



  The relay 730 to the armature 731 connects the positive through the resistor 732 to the talk wire to discharge the capacitors of the line on which we agitate so that the pulling of the cutoff relay is prevented. ringing 740 by discharging the same capacitors before the called subscriber answers. To armatures 893 and 894, relay 890 connects wires M1 and M2 to the contacts of the pulse counting relays and to the upper coil of relay 810. To the other armatures, relay 890 connects the call combination wires Ci to C10 to the contacts of the pulse counting relays.



   At armature 977, relay 900 closes the at-

  <Desc / Clms Page number 30>

 pulling of relay 940 which armature 989 prepares the power supply circuit This the left primary lower winding of the bell transformer RT and prepares a short circuit in its own winding. Shortly after the attraction of relay 940, relay 939 attracts and opens the circuit from relay 960 to armature 984. At armature 985, relay 939 short-circuits relay 940.

   Relay 960 attracts. following the release of the relay 960 the spring ..SI starts to vibrate and prepares a circuit which closes intermittently Day attract the slow relay 938. when the relay 940 is short-circuited 11 releases its armature 989 and opens the short circuit of its own winding to springs 986 and it opens the circuit of the winding, Left side of the ringing transformer to the springs 988. The vibrating armature 989 due to the weight of its extremity operates the spring 987 which prepares the circuit of the right primary winding of the bell transformer RT.

   The relay 940 attracts under these conditions by: positive to the earthed armature 977 via resistor A and loops again, by the operation of its vibrating armature 989, the short-circuit of its own winding and, at the same time, prepare the circuit of the lower left winding of the transformer RT. Relay 940 releases again and removes its short circuit while the moment of its weighted spring again prepares the circuit of the right winding of the ringing transformer. The previous cycle of relay 940 operations continues until its circuit is opened at armature 977.



  When relay 939 drew to armature 983, it grounded the switch start wire thereby closing the pull circuit of switch relay 915, and the latter to armature 937 closed. a circuit through the lower winding of relay 975.

  <Desc / Clms Page number 31>

 



   The relay 75, on atrirant, to the armature 990 closes its blocking circuit 1 through its upper winding by the armature 977 r: ise to the earth and to the armatures 991 and 992 it closes the circuits of the left and right primary windings of the RT ringtone transformer. The magnetic fields of the left and right primary windings of the RT ringing transformer are in opposite directions and when energized alternately because the vibrating arr.ature 989, retort described above, they induce an alternating current in the upper secondary windings of the transformers which provide the ringing current.

   Part of the alternating current generated in the secondary winding of the ringing transformer flows through the capacitor and the winding of the ac relay 958 to positive. Relay 958 attracts and% armature 979 closes the circuit of relay 938 through vibrating armature 981. Relay 938 attracts and remains attracted as long as relay 958 remains attracted and armature 981 vibrates. Relay 938 to armature 982 removes the positive from the alarm wire going to Fig. 11 to prevent transmission of an alarm. If for some reason the ringing current does not generate relay 958 will not pull to close the circuit of relay 938.

   Relay 938 will therefore not attract and the general alarm wire is held to earth to operate the alarm equipment after a determined time interval.



   Switch relay 915 by pulling armature 936 disconnects the positive of the winding of relay 730 to cause its release and at armature 957 it removes the short circuit of relay 914 to allow this.

  <Desc / Clms Page number 32>

 
 EMI32.1
 of the switch grounded. iterrature 971 relay 15 closes the control relay attraction circuit} rL1ci) al 912 ... armature 53 relay 912 closes the attic attraction circuit SOI CO code relay! . :: 8 follows: switch start wire grounded, armatures 954, 95, 'J51 and; 50, relay 101, negative.

   The relay 901 by attracting operates its reinforcements
 EMI32.2
 higher b01C u 016 inclusive Day prepare the circuits of .Lise to earth its call combination wires' ::: 1 to C6 inclusive and C10. :, armature 961, relay 901 overrides its blocking circuit 1, through the springs
 EMI32.3
 normally closed controlled by the armature z17 of relay .02 and the starter wire i-is to earth, and at the ar:,: ature 916 it connects the attraction circuit of relay 910 via the closed springs controlled by armature 970. In armature 928, relay 01 closes the attraction circuit of bell relay 810 CO (! 1 [Í, e follows: switch starting wire; .is 1 la earth, armature 928, wire 1 ': 1' armature 893, 828 and 803, relay 810, negative.

   The relay 910 by attracting, at armature 951 opens the attraction circuit of relay 901 and at armature 970 it closes its blocking circuit via the starting wire of the grounded switch.



   After a while the relay 914 attracts and at the frame 955 it connects the positive to the wires C1 to C6 inclusive, and C10. At armature 956, relay 914 short-circuits switch relay 915. After a certain time, relay 915 releases, at armature 936 it again closes the attraction circuit of relay 730 and at armature. ture 957 it resets the switch relay 914, which releases, as shown previously. At armature 974, relay 915 opens the short circuit of the upper winding of relay 913, as a result, relay 913 now draws in series with relay 912.

  <Desc / Clms Page number 33>

 



     ,, after a short interval, relay 915 attracts and short circuits relay 914 to armature 957, relay 914 releases and to armature 956 opens the short-circuit of relay 915 to allow it to re-attract under the action of the start wire of the grounded switch. armature 955 relay 914 disconnects the positive from the bell wires. Relay 915 draws under the action of the grounded switch start wire and the cycle of the previous operations of relays 915 and 914 continues until the positive is removed from the start wire of the switch. switch armature 983 by releasing relay 939.



   The second time that relay 915 attracts or on the second pulse, it tarnishes the attraction circuit of relay 911 via armatures 974 and 973. Relay 913 is kept attracted by this circuit until switch relay 915 releases. . Relay 911 to armature 952 closes the attraction circuit of the next code relay with an even number, in this case relay 902.



  At armature 971 the main control relay 911 opens the blocking circuit of the relay 912 and prepares its blocking circuit, it closes when the relay 912 releases. When relay 915 releases it opens the lower winding circuit of relay 913 which releases.



   The code 902 relay by drawing to its upper armatures prepares the ground circuits of the call combination wires C1 through C6, inclusive, Cg and C10.



  At armature 962, relay 902 closes its blocking circuit via the normally closed springs controlled by armature 918 and the starting wire of the earthed switch; at armature 917 it opens the blocking circuit of the first code 901 relay which now releases, the armature also connects the starting wire of the grounded switch to wire M1 which is thus put to Earth.

  <Desc / Clms Page number 34>

 



   On the next pulse u third pulse the main control relay circuit 912 attracts; new. The main control relay 912 attracting, to the armature 972 opens the blocking circuit of the relay 911 which now releases; and ar.-ature 953 it connects the starter wire of the Earthing switch to relay 903. Relay 911 when releasing, to armature 952 opens the original attraction circuit of the code relays bearing even numbers and at armature 971 it short-circuits the upper winding of relay 913.



  At the end of the pulse when relay 915 releases, the neck: circuit of the upper winding of relay 913 is removed and relay 913 thereby draws in series with relay 912. The previous cycle d The operation of the main control relays 913, 911 and 912 continues until earth is removed from the switch start lead and thereby the switch relays 914 and 915 will release.



   The following table against 34 operating periods of the code switch relays in which the periods are set by the conditions of attraction and release of the main switch relays 914 and 915. For example, as shown in the table, the first vertical column indicates which of the main control relays is attracted. For the first period it will be seen from the table that the main control relay 912 is attracted. The third column indicates which code relays are drawn in the different periods. It will also be seen that the code relays 901 and 910 are drawn during the first and second periods. The last column indicates which call combination wires are grounded during the different periods.

   As shown in the table during the first period when relay 914 is pulled, relays 901, 910 and 912 are pulled

  <Desc / Clms Page number 35>

 
 EMI35.1
 also and the combination wires, call 1 ": 1 'CI to c ,, inclusive, nent, and CIO are Lnis 1 earth. During the third period, or third pulse as described hereby relays 02, 910, 911 and 91S are attracted and the sons of apjel 1., C1 to Cg, inclusive, and Cg and C10 are [, 1a to earth.

  <Desc / Clms Page number 36>

 SWITCH CODE TABLE
 EMI36.1
 
 <tb> Period. <SEP> Relay <SEP> interrup- <SEP> Relay <SEP> of <SEP> Relay <SEP> of <SEP> Son <SEP> of <SEP> combined (
 <tb>
 <tb>
 <tb>
 <tb> teurs <SEP> 914 <SEP> & <SEP> 915. <SEP> control <SEP> code <SEP> attracted.

    <SEP> of <SEP> ringtone <SEP> put <SEP> a
 <tb>
 <tb>
 <tb> principal <SEP> the <SEP> earth.
 <tb>
 <tb>
 <tb>
 <tb> attracted,
 <tb>
 
 EMI36.2
 1 attracted 912 901.910 UloCle2,3,495,691t 2 released 912.913 901.910 M1 3 attracted 911.913 902.910 Dl, Ol, 2,3,4,5,6.9 4 released 911 902.910 Mi 5 attracted 912 903.910 Z'1., 05.6, 8,9,10 6 released 912,913 903,910 la 7 attracted 911,913 904,910 LU, 01,8,3,4,6,7,8
 EMI36.3
 
 <tb> 8 <SEP> released <SEP> 911 <SEP> 904.910 <SEP> 9.10
 <tb>
 
 EMI36.4
 9 attracted 912 905.910 M2, C%, 3,4,5,7, d 10 released 912,913 905,910 M2 11 attracted 911,913 906,910, $, 4,5,8,7,9,1c
 EMI36.5
 
 <tb> 12 <SEP> released <SEP> 911 <SEP> 906.910 <SEP> M2
 <tb>
 <tb>
 <tb>
 <tb> 13 <SEP> attracted <SEP> 912 <SEP> 907.910 <SEP> M2
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 15 <SEP> attracted <SEP> 911.913 <SEP> 908.910 <SEP> M2,05,7,8,

  9
 <tb>
 <tb>
 <tb>
 <tb> 16 <SEP> released <SEP> 911 <SEP> 908.910
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 17 <SEP> attracted <SEP> 912 <SEP> 909.910
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 18 <SEP> released <SEP> 912. <SEP> 913 <SEP> 909.910
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 19 <SEP> attracted <SEP> 911. <SEP> 913 <SEP> 909. <SEP> -
 <tb>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 20 <SEP> released <SEP> 911 <SEP> 909. <SEP> - <SEP>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 21 <SEP> attracted <SEP> 912 <SEP> 909. <SEP> - <SEP>
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 22 <SEP> released <SEP> 912.913
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 23 <SEP> attracted <SEP> 911.913
 <tb>
 <tb>
 <tb>
 <tb>
 <tb> 24 <SEP> released <SEP> 911
 <tb>
 
 EMI36.6
 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1 drawn 912 901.910 M190lt2t3t4o5t8olC
 EMI36.7
 
 <tb> 2 <SEP> released <SEP> 912.913 <SEP> 901.

    <SEP> 910 <SEP> M1
 <tb>
 

  <Desc / Clms Page number 37>

 
One way identical to that described above, the code relays are successively drawn to prepare the circuit of the next code relay and to open the olocking circuit of the preceding code relay to release the latter. Each code relay is thus attracted and during the time that the switch relay 914 is attracted the code relay will earth the call combination wires by its upper armature and as indicated in the table.

   Note that the first four code relays 901 to 904, inclusive, maintain positive continuously on wire M1 as long as any one of these relays is attracted and with regard to code 904 relay the wire remains on. to earth by relay 904 until main control relay 913 releases. The circuit taken goes through the start wire of the grounded switch, the armatures 919 and 930 and the wire M1.



  After relay 913 releases there is a period during which neither of the M1 or M2 wires is grounded by the code relays.



   When the switch relays attract during the ninth period and cause the attraction of the main control relay 912 and the code 905 relay, the M2 wire is earthed by the armature 920. In the same way the Ma wire is continuously grounded by operation of code relays 905,906, 907, and 908 and the main control relay 913. The circuit holding the main M2 wire to ground runs through the starter wire of the grounded switch. earth via the reinforcements 923 and 929. It will be seen by referring to the table that the wire M1 is kept continuously on earth from the first to the seventh period and that the main wire M2 is continuously grounded from the ninth to the fifteenth period .

  <Desc / Clms Page number 38>

 



   Code relay @ 08 is drawn during the fifteenth period, at armature 168 it closes its blocking circuit, at armature 923 it Maintains positive on wire M2 until cue relay 913 releases and ^ ar- nature 931 it closes the attraction circuit of relay 959 by its lower winding.

   The relay 959 to the aroma 980 opens the circuit of the relay 960 to its normally closed contacts and closes its blocking circuit through its upper winding through the armature 976 'and the blocking wire H which is grounded to armature 32. When relays 914 and 915 are energized during the seventeenth period, relay 912 is energized; it closes the attraction circuit of relay 909 by means of its armatures 953 and 948. At armature 969, relay 209 loops its blocking circuit, at armature 924 it opens the relay's blocking circuit 908 and armature 932 it removes the positive of the blocking wire H to release the relays 890 and 959.



   When the switch relays are energized during the nineteenth period, relays 911 and 913 are energized and short-circuit relay 910 through armatures 952 and 954. Relay 910 when releasing, at armature 951 prepares the attraction circuit of the first code 901 relay and armature 970 opens its blocking circuit and prepares its initial attraction circuit.



   When relays 912 and 913 are energized during the twenty-second period, relay 909 is short-circuited through armatures 925, 926 and 927. Relay 909 on releasing to armature 932 once again connects the positive. to the blocking wire H and to the armature 933 the circuit for connecting the negative to the choice wire PU whose circuit loops to the armature 935 when the relay 911 draws in the twenty-third period.

  <Desc / Clms Page number 39>

 



   Connecting the negative to the PU choice wire closes the attraction circuit of relay 960 as follows: positive, armatures 932, 976 'and 980, relay 960, choice PU wire, armatures 935, 934 and 933, negative. The negative connection to the choice wire PU also closes the circuit causing relay 890 to re-attract in the event that the called subscriber did not answer at this time.

   The circuit making relay 890 re-attract closes as follows positive, armatures @ 38 and u85, wire 736, armature 787, f: 718, left winding of relay 890, negative on the PU nut wire. As can be seen by referring to the switch code table none of the code relays are pulled during the twenty-third and twenty-fourth periods and in case. the called subscriber did not answer the switch starts again for a second operating cycle of the 24 periods.



   It will be remembered that at the start of the code cycle the relay 890 drew to prepare the ringing circuit and that the third digit sent was the number 3 so that the relays 710,700, 880 and 850 are operated to select the wire of call combination C3 (see pulse table). The called subscriber's call code 333 is a long shot followed by two short shots. Since the M1 wire is continuously grounded during the first seven periods of switch relay operation, the bell relay 810 is pulled for a corresponding period of time to produce a long bell. The attraction circuit of relay 810 starts from the grounded wire M1 and through the armatures 893, 828 and 803 and through the upper winding of the bell relay 810 ends in negative.

   The C3 bell wire is grounded during the first, third and seventh

  <Desc / Clms Page number 40>

 periods and during this time a circuit closes through the lower winding of the bell relay 810 as follows: ground wire C3, armatures 883, 857 and 827, relay 810, negative. This last circuit however is ineffective during the first, third and seventh periods because the relay 810 is already attracted by the intermediary of its upper winding via the wire M1.

   Relay 810 drawing to armature 811 connects generator wire 646 to wire 767 for tran. set the ringing return tone to the calling subscriber and to armature 812 it connects the dreaming current to the line to call the subscriber according to the following circuit: generator wire 646, armatures 821 and 812, wire 379, armature 336, wire 496, armature 439, lower conversation wire of the called line, and thence through the fork springs, the bell capacitor and the bell of station 333 to positive. The ringtones of other subscribers connected to this line are also activated.

   In the event that subscribers have their ringtone bridged across the two line wires instead of having their ringtone grounded the positive return circuit is extended through the upper conversation wire, the armatt 438, the wire 495, armature 337, wire 389, armatures 813 and 822 to positive.



   During the eighth period of switch operation the positive is disconnected from wire M1 by releasing relay 913. As a result of removing the positive from wire M1, the circuit passing through the upper winding of bell relay 810 is open which has the result of releasing the ringing relay and suppressing the sending of the call current on the called line. So far the operation of the call relay 810 has produced a long ringing tone since the M1 wire has been grounded.

  <Desc / Clms Page number 41>

 from the first to the seventh period inclusive.



    Retort it was previously described during the ninth period the M2 wire is earthed but in this known case the relay 820 is not attracted the M2 wire is not connected to the call relay 810. The call relay 810 will therefore be able to attract when the wire C3 is grounded. By referring to the switch code table it can be seen that under the action of relays 905 and 906 wire C3 is earthed during the ninth and eleventh operating periods of the code switch relays. The call relay 810 thereby turns on during the ninth period and draws again during the eleventh period to transmit the inrush current on the called line and transmit two short rings.



   Since the C3 call combination wire is no longer connected to ground during the other periods of the switch code relay 810 will not pull. From the above it can be seen that for a complete operating cycle of the code switch relay 810 has been drawn during periods 1 to 7 inclusive, and during the ninth and eleventh period to transmit a code d. call consisting of one long ringing tone and two short ringing rings. The following table gives the call code for subscribers 1 to 20, inclusive, for numbers 1 to 0, inclusive.

  <Desc / Clms Page number 42>

 
 EMI42.1
 



  Table of the alaodel Code.
 EMI42.2
 
 <tb> Cipher <SEP> of <SEP> Code Call <SEP> <SEP> Code Call <SEP> <SEP> for <SEP> the <SEP> bark
 <tb>
 
 EMI42.3
 GDnel code. 'For alumni 11 to 20 (when the first 1 10. i-st digit er: is is 7).
 EMI42.4
 
 <tb>



  1 <SEP> 1 <SEP> long <SEP>; <SEP> short <SEP> 1 <SEP> short <SEP>
 <tb>
 <tb> 2 <SEP> 1 <SEP> long <SEP> 1 <SEP> short <SEP> 2 <SEP> He <SEP> 2 <SEP> "
 <tb>
 
 EMI42.5
 .3 1 If 3. "9 't 3 If, 1 1 tt 3 Il If 4; t' 5 1" "3 If 4 If
 EMI42.6
 
 <tb> 6 <SEP> 1 <SEP> " <SEP> 1 <SEP> long <SEP> " <SEP> 1 <SEP> "
 <tb>
 <tb> 7 <SEP> 1 <SEP> short <SEP> 1 <SEP> " <SEP> 3 <SEP> " <SEP> 1 <SEP> "
 <tb>
 
 EMI42.7
 2 If 1 tt 3 "a" 3 tt 1 tr 3 "3 n 0 tt 1 If 4r tir 2"
The first five subscribers at the time of sending a long ringing ring have their ringtone connected to the same conversation thread, while the other five subscribers have their ringtone connected to the other conversation thread, this in the cases where ringtones are grounded.

   If the called subscriber is 336 instead of 333 two long rings will be transmitted by the ringing relay 810. In this case the third digit transmitted would be 6 and therefore, referring to the previous table, we will see that relays 720,830 and 820 are pulled to select wire C6. As previously described wire M1 is then grounded during periods 1 through 7 inclusive, and since pulse relays 830 and 820 are pulled, relay 810 is pulled during this period of time as follows : M1 wire earthed, armatures 893, 804 and 837 and 827, lower winding of relay 810, negative.

   Bell relay 810 is released during the eighth period following the release of relay 913 and since wire M2

  <Desc / Clms Page number 43>

 is earthed for ILS periods-. 9 to 15, inclusive, the bell relay 810 is drawn according to the circuit. ground wire, armatures 894, 828, and CG3, bell relay top winding 810, negative. The ringing relay 810 connects the generator to the called line in the same way as described above to transmit two long ringing strokes to call subscriber 336.



   Subscribers 337, 338, 339 and 330 are called by the combination of short ringing strokes followed by a long ringing stroke. If the called subscriber is 337, following the sending of the number 7 the relays 710,700, 820, 880 and 870 will be drawn to operate the selection of the C7 wire. In this case during the time that the M1 wire is earthed, no circuit will close to attract the relay 810 since the relay 820 is attracted and the counting relay 830 releases. Grounding wire M1 therefore has no effect on bell relay 810. n referring to the switch code table, it can be seen that wire C7 is grounded as a result. of the attraction of relay 904 during the seventh period.

   The attraction circuit of relay 810 then loops as follows: earthed wires C, armatures 886, 878 and 827, lower winding of relay 810, negative.



  Relay 810 draws along this circuit to send a short ringing tone to the called line. Since relay 810 is attracted at this time wire M2 during periods 9 to 15, inclusive, causes relay 810 to be pulled during these periods to transmit a long ringing stroke on the called line. Subscriber 337 is therefore called by a short ringing stroke and a long ringing stroke.

  <Desc / Clms Page number 44>

 



   The other connected parties' - the same line will be called in an identical way according to the third digit which will have been transmitted. Referring back to the table of impulses, it will be possible to see which of the repeating and counting relays are attracted by the sending of any number in order to operate the selection of a determined ringing wire. Referring now to the switch code table, it will be possible to see when the two wires M1 and M2 and the call wires C1 to C10, included, are earthed for the different called groups. The call code table shows the different ring codes applied to the various subscribers.



   Suppose now that twenty subscribers are grouped in parallel on line 33, if a subscriber wishes to call the number 736 he should send the digits 7, 3 and 6.



    Retorted it was described previously by the enission of the first digit, the 7, the relay 800 is attracted and blocks in working position. The relay 810 also closes the attraction circuit of the relay 432 as described above. At armatures 803 and 804, relay 800 opens the circuits of wires M1 and M2 so that the earthing of wires M1 and M2 has no effect on relay 810 which will be attracted only by its lower winding according to the number times the positive will be connected to the C1 and C10 wires.

   In the current case of subscriber 736's app, relays 720, 830 and 820 are drawn to operate the C6 call combination wire selection.
Referring to the switch coda table it will be seen that the call combination wire C6 is grounded during the first, third, fifth, seventh and eleventh periods. Each time the C6 wire is earthed, the relay attraction circuit

  <Desc / Clms Page number 45>

 810 closes as follows: positive :: or C6 wire, armatures 895, 804, 837, 827, coiled, lower ent of relay 810, negative. The relsis 810 attracts under the action of each of these pulses to transmit the code consisting of 1 short ringing sounds followed by a short ringing tone.



   If the number 733 had been issued, the 850 count relay would have selected wire C; each time wire C3 is grounded, a circuit closes by: armatures 883, 857 and 827, lower winding of relay 810.



  When one emits the number 730 the counting relays 820 and 840 are activated Day operate the selection of wire C10 and each time the wire C10 is earthed a circuit closes as follows: armatures 897, 846 and 827, coils - lower side of relay 810. The relay 810 attracts each time that the selected call wire is grounded to emit a series of short ringing rings followed by a series of short ringing rings, to call subscribers 11 to 20 grouped on line 33.



   When the called subscriber hears his code sounding and answers it either between code pulses or between cycles, a circuit is closed through the subscriber's loop to cause the pulling relay to be pulled. ring 740 retort follows: positive, armature 614, wire 746, lower coil of relay 740, armature 731, 742 and 752, wire 774, armature 813, wire 389, armature 337, wire 495, armature 438, line wire, extension customer, line wire, armature 439, wire 496, armature 336, wire 379, armature 812, wire 768, armature 751 and resting contact, impedance 774, negative.

   Relay 740 by pulling to armature 744 closes its blocking circuit through itself: upper and lower windings in series to armature 614 grounded, through wire 746; to armature 742 it connects relay 770 to wire 774, to

  <Desc / Clms Page number 46>

 reinforcements 7-il, 742 and 743 it completes the conversation circuit between the calling and called lines; and at armature 745 it removes the positive from the generator start lead 757 to attract relay 900 and stop the ringing machine. The relay 770 draws on the circuit of the fillet line in series with the impedance 774. at the armature 772 the relay 770 opens the blocking circuit of the relay 780.

   The relay 780 by releasing the armature 788 opens the blocking circuit of the pulse counting relays to allow them to release; and at armature 779 it opens the blocking circuit of relay 890 to allow the latter to release. The pulse count relays release and relay 890 on releasing disconnects the code switch from the feeder circuit.



   The supply current is supplied to the calling subscriber through the windings of relays 690 and 692 and the called subscriber through the windings of relays 770 and 774. The conversation circuit between the 2 subscribers follows the reinforced features and comorend the 2 conversation capacitors.



   At the end of the communication when the called subscriber has hung up his receiver, the circuit of relays 770 and 774 is open which causes the release of relay 770.



  The relay 770 to the armature 773 connects the lower winding of the time release relay 604 to the time pulse wire 655 o to ensure the release of this equipment if the calling subscriber does not. to hang up.



  When the calling subscriber hangs up the circuit of relays 690 and 692 opens to release line relay 690. Relay 690 when releasing, armature 691 opens the circuit of relay 640 and in the same way opens the circuit of relay. slow relay when released 600. Relay 640, when released

  <Desc / Clms Page number 47>

 at armature 642 closes the attraction circuit of relay 650 which is attracting at the moment for no useful reason.

   After a while the relay 600 releases and at armature 601 opens the circuit from slow relay to release 610, at armature 602 it removes the positive from test lead 299 which goes to the calling line to allow the relay to reset. allows 171 to release and to release the line, and the armature 603 opens the circuit of the line relay of the group of researchers 120 to allow its release.



   Releasing the relay, at armature 613 opens the circuit of the lower coil of relay 620 and at armature 614 opens the block circuit of relay 740 through its lower coil. Relay 740 releases and at armatures 741, 742 and 743 open the conversation circuit. When releasing relay 620, armature 622 opens the blocking circuit of searcher group control relay 122 and searcher relay 210, thus allowing these relays to release; at armature 625 it opens the blocking circuit of relay 680, finder relay 330 and connection group control relay 432, thus allowing these relays to release and release the called line.

   At armature 626 relay 620 removes the positive from ground wire 616 to make this equipment available for further calls and it connects the positive to the busy wire of all feeders 629 to hold relay d. 'occupation of all 588 feeders attracted. Relay 680 when releasing, at ar mature 682 opens the circuit of the line relay of the group of researchers 430 and at armature 683 it disconnects the pos tive which marked the called line. to occupation. By following the operations which have just been described, all the relays have returned to the normal position and the power supply circuit is available. now for the establishment of other calls.

   

  <Desc / Clms Page number 48>

 Before explaining what happens when a free line is called @ will now describe the sequence of operations which take place when the called line is pccubed. It will be remembered that during the reception of the pulses of the third digit, the relay 710 attracts and that at the armature 712 it closes the attraction circuit of the occupancy relay 670 by means of its lower winding and the earth connected to the test lead of the called line * The relay 670 by attracting, to the armature 672 connects the busy tone to the calling line according to the circuit:

   busy tone sending wire 689, armature 672, TC tone capacitor, wire 693, through the conversation capacitor and then through the talk wires shown in reinforced lines to the subscriber loop app lant. . the c75 armature relay 670 closes its blocking circuit and to armature 678 it closes the circuit which passes through the upper winding of relay 630.



   At the end of the third digit, relay 650 releases in the manner previously described and at armature 653 it opens the blocking circuit of relay 630. At armature 633, relay 630 closes the original attraction circuit. ginal of relay 640 and to armature 634 it transfers the circuit of relay 600 to armature 691.



   When the calling subscriber hears the busy tone, he hangs up and thereby opens the circuit of relay 690. Releasing relay 690 opens the circuit of relays 600 and 640 to armature 691. The relays which remained engaged release in the manner described above.



   We will now describe the sequence of operations which take place when a subscriber calls another connected to his own line. If the calling subscriber 216 wishes to make a return call and call another subscriber connected to his

  <Desc / Clms Page number 49>

 
 EMI49.1
 --re li 'ne,' 3..rē {> arl) on .1'J..r.: éI'J = 17, it will enter an a2.L ent '.Ar i: .re and ( ) -) erera) or:;. -1 1 sending of digits 1 and 7 '; 0 ,, :: e he cited J: crit) recéâetnr'1ent. At the beginning read: th digit since the called line is connected ', the r..erae: 1, xiie ¯ue il - -) From' -1. -te 1 a? i gne ii will be found iJccuflée e7 the relay 70 will attract as it was, written above '.' ent. "When the calling subscriber hears the busy tone he hangs up, which opens the
 EMI49.2
 cooked relays; O and 592.

   Relay 660 by releasing: '. 1 'ar: ratvre 1 opens the circuits of relays 640 and 60C as described d, -j. Relay f: 0 years rG1chant, ar- ¯G.tur <3 c. ,, 2 attracts relay 650 which armature 5J connects the positive to the test lead of the calling line to keep the cut-off relay of the line ael4ute 171 attracted to the following: positive, armatures 653, ij7 and, 7.5, "il 73J, normal springs <#, ent closed controlled by er.i: sz.1i. * 75, j, wire ,, '.; 9, armature, 518, wire 499, armature of relay 422, wire 156 of cable to 3 conductors 159, armature 179, relay 171, negative.

   The slow relay
 EMI49.3
 on release 600, on armature 301 opens the circuit of relay 610, on armature 603 it opens the circuit of relay 120 and on armature 602 its working contact removes the positive of relay 171, but relay 171 does not not release at this moment because it remains held attracted by the positive given to the armature 653. At the armature 602 the relay 600 closes the attraction circuit of the line test relay 680 as follows: positive, arma-
 EMI49.4
 ture u53, circuit described previously to wire 156,
197, armature 179, 176 and 129, ¯'il .318, wire 299, armature 602, 669 and 679, lower winding of test relay 680.

   From the above it can be seen that although the called line is connected to the calling line, when a return call is made to the circuit giving ground

  <Desc / Clms Page number 50>

 the line called by the action of relay 650 is extended through the contacts of the connector relays and the finder to the line test relay 680 to attract the latter. Relay 680 by pulling. the armature 684 closes its blocking circuit and extends the positive to the cut-off relay 171 as follows: positive, amatures 625, 368, 684, 679, 669 and 602, wire 299 and from there through the armatures of the attached relays - researcher and researcher group network up to frame 176 and relay 171.

   At armature 687, relay 680 closes the attraction circuit of relay 610 retort follows: positive, normally closed contacts controlled by armature c07, armature 658 and 687, wire 739, armature 789, wire 738, relay 610, negative . At armature 682, relay 680 closes the attraction circuit of relay 420 through the earth armature 632, wire 319 and the armatures of relays 310 and 422. At armature 688, relay 680 closes the circuit. the generator start wire 657 ground to pull relay 900 and start the calling machine.



   The calling machine and the code switch in fig. 9 operate as described above. When the negati. is connected to the PU choice wire at the 976 armature by pulling the relay 900 in the event that the calling machine is not in use, or when the PU choice wire is connected to the negative by the 'intermediary of armatures 933, 934 and 935 by the operation of relay 911, approximately at the end of the code cycle, the circuit of relay 690 is closed through its left winding by: the positive taken to the armature 638, reinforcements 685 and 787 and wire 718.

   Relay 890 attracts and closes its blocking circuit described previously, to armature 892 by the earthed blocking wire H and through its right winding it connects wires C1 to C10 inclusive, and M1 and M2 on the-

  <Desc / Clms Page number 51>

 which the positive 1 -pulses are transmitted by the code switch to attract the ringing relay 810, according to the pulse counting relays which have attracted, to transmit the current as it has been described preceded.

   For return calls, the ringing current is transcribed as follows: generator wire 846, armature 821 or armature 822 depending on the discrimination digit of the code emitted, & rmatures 812 and 813, wires 379 and -; EG, armatures 316 and 317, wires 499 and 438, armatures of relay 420, wires 157 and 158 of 3-conductor cable 159, line wires of calling and called subscribers, ringing, positive.



   In the case where the subscriber sending a call back to his ringtone connected to the same conductor as the called party, he will receive equal: .. ent the call by code. However, if the ring of the called subscriber is connected to the other wire, the calling subscriber will not hear the code, he must wait for a sufficient time, before picking up, for one or more calls by code to have been able to be transmitted. When any subscriber of the line answers the call, the ringer cut-off relay 740 attracts and its equipment operates in the manner previously described.

   Relay 740, attracting, to armature 744 closes its blocking circuit through its two series windings and to earth to armature 614, to armature 745 it opens the circuit of relay 900 and to armature 742 closes the attraction circuit of relay 770. Relay 770 attracts through the loop of the subscriber's line in series with impedance 774 and at armature 772 it opens the circuit of blocking of relay 780. When releasing relay 780, the armature 788 opens the blocking circuit of the pulse counting relays. At armature 787 it opens the original attraction circuit of relay 890, at armature 779 it opens the blocking circuit of relay 890 to allow

  <Desc / Clms Page number 52>

 . this to release and. The armature 789 opens the circuit of the relay ± lE.



   Relay 610 releases after one. for a certain time, at armature 613 it opens the circuit of relay 620 and at armature 614 it opens the blocking circuit of relay 740. Relay 620 when releasing, at armature 622 opens the blocking circuit of relays. relay 122 and 210, at armature 625 it opens the blocking circuit of relays 680, 422 and 310. At armature 623, relay 620 opens the circuit of relay 650; at armature 626 it removes the positive from the ground wire 616 Day make the equipment available for another call; at its rest contacts it :: ¯and: earth the common wire 629 to keep the occupancy relay of all the alienteurs 588 attracted; and at year 624 it opens the blocking circuit of relay 670.



  Relay 740 releases and opens the loop of the called line. Relays 122 and 210 release and disconnect the test lead from the calling line on the incoming side. Relay 680 releases and at armature 682 opens the circuit of relay 420. Relay 650 on releasing, at armature 653 removes the positive from the subscriber line test lead and thereby opens the circuit. relay 171. Relays 422 and 10 release and disconnect the test lead from the calling line on the outgoing side.



   The cutoff relay 171 associated with the calling line releases and opens the circuit of the relay 170 and with the armatures 177 and 178 closes the circuit for attracting the relays 172 and 173 through the subscriber's loop. Relay 172, pulling, to armature 181 closes the blocking circuit of relay 170 before it has fully released and to armature 179 it grounds test lead 156 to mark that line at occupancy for other calls.



  All relays in the feeder circuit are released

  <Desc / Clms Page number 53>

 
 EMI53.1
 Gaiütenant and Ilo.14Lr, ^. Enteur zut be used for other a <eis. The 6th süonné yel: nt and called power is supplied through the windings of the relays 172 and 173. When the barks come from the line, they hang up the circuit of the relays 172 and 173 is open and the relay 172 when releasing, the 'armature 181 opens the blocking circuit of the
 EMI53.2
 relay 170 and 1; armature 179 sU) 9riL: .e the positive of the test lead Day release this line.



   The relay 170 releases after a certain time and the armature 175 prepares the starting circuit which causes
 EMI53.3
 that the ..ise in service #: l di7, -ributor to connect a free linker this line when it calls.



   Local people have access to 1 2 groups of junctions The first junction group is made up of the last 3 lines of the group of 30, while the second junction group is made up of the last 3 lines
 EMI53.4
 to the group of w0. To enter a free junction of the first group, a local subscriber must send the number 9, to reach a junction of the second group he must send the number 0.



     , when a subscriber calls and calls the feeder
 EMI53.5
 free preselected is connected to the calling line and when the subscriber er. and the digit 0 the pulse repeater relay 720 and the pulse counting relays 820, 880 and 840 attract at the end of the train pulses of in the manner described above. when relay 650 releases
 EMI53.6
 after the last pulse, the relay 750 control circuit closes as follows: positive, armatures 638,654, 685 and 677, wire 735, armatures 823, 842 and 815, wire 777, relay 750, negative.

   Relay 750 draws it, to armatures 751 and 752 disconnects relays 774 and 770 and places the conversation wires in direct passage, to armature 753 it transfers the test wire of the junction called of the line test relay 680 to junction test relay

  <Desc / Clms Page number 54>

 
 EMI54.1
 00, -t, l 'sture 7à = i- -ie 10 attraction circuit zou relay 3Li com. # Follows: positive, arc.atL;, re ê27, wire 77, Téô and 75 armatures, il T3E, r -ature 18, wire -8, relay = 12, c -, - atif; ez 1, i 'arr¯ature? 5G it buckles its circuit dd blocking to the wire J29 put' \ the ground.



  -e r21as 22 on attracting, the stop-4ture 425 closes its blocking circuit cu wire 52S 'Lis \ the earth,', - its upper armatures ii coti.ect the test wires of all the junctions and of all the subscriber lines of the iG group to the Korean contacts, neither of these relays of the connector and 1:. 1t = ra ¯a ture = 6 it dulls the circuit of attraction of relays 7 ± G. - ', l'rr'et; ure 7ì le. rAlais 70 loops its blocking circuit to the wire l'.is 8 .. the earth 696 psr the intermediary the springs normally closed controlled by the armature '? 8G,: the ar7aure' 793 it opens the blocking circuit of relay i, it releases and 2 l 1 ar-f ture '735 it closes the circuit this search for junction @ to cause the attraction of the first junction connection relay 380.

   Relay S1, when releasing, disconnects the group connection relays and opens the blocking circuit of the pulse counting relays. At armature 381, relay 380 closes its blocking circuit before having operated its other armatures, armature 384 opens its original attraction circuit and closes the attraction circuit of slow relay 390. As we can see the:. junction connection relays 380, 390 and 300 are slow and therefore do not operate.
 EMI54.2
 do not rent ... immediately when their attraction circuit closes. At armature 388, relay 380 connects the test lead from the first junction to wire 399 through armature 308.



  Further operation depends on whether the te wire of the seized junction is grounded or not. In case o: the junction is occupied the positive of the test lead of the junction called will short-circuit the winding on

  <Desc / Clms Page number 55>

   , -4-laughing at the 660 junction test relay and? Will revert its attraction. In the event that the Junction is free, relay 380 to armature 388 connects, through the winding of the associated cut-off relay L this junction, a negative to the upper winding of relay 660 which attracts. In order to make the description absolutely complete, we will assume Gour for a moment that the first junction is occupied.

   After a while, relay 30 attracts the positive of wire 324; to the armature 391 it sets up its olocage circuit by means of the armature 305 and the grounded wire 329 before forwarding; operated on any other of its frames; at armature 395, relay 390 opens the blocking circuit of relay 380.



  At armature 398, relay 390 connects the test lead from the second junction to relay 660. If junction e; 'Bind the negative given through the associated cut-off relay 1 this junction causes the attraction of relay 660. If we assume that the junction is occupied, the rela: 300 attracts when the relay 380 releases to close the circuit). attraction of relay 300. Relay 300 at armature 301 blocks on grounded wire 329, at armature 305 it opens the blocking circuit of relay 390, at armature 304 it opens the circuit. original of attraction of relay 380 and prepares that of relay 670; at mature ai 308 it connects the test lead of the third or last junction of the group to relay 660.

   After a certain time the relay 390 releases and its armature 394 completes the attraction circuit of the occupancy relay 670 only in the case where the last junction of the group is occupied. Busy relay 670 pulling in, armature 672 sends busy tone on the calling line.



   When a free junction is found, relay 660 attracts by the negative taken through the cut-off relay

  <Desc / Clms Page number 56>

 associated with the free junction to stop the subsequent operations of the junction search relay by disconnecting the positive of wire 324 to Immature these before the next junction search relay has had time to obey completely and close its blocking circuit. Assuming that the first free junction is the last of the group, relay @ 00 attracts, to armature @ 08 it closes the circuit for attracting relay 660 by its upper winding in series with cut-off relay 101.

   The relay 660 by attracting, to the armature 661 opens the circuit for sending the tone to be transmitted to the calling line; at ar: -atures 632 and 664 it disconnects relays 692 and 690 from the calling line and transfers the aooelante line to wires 694 and 696, at armature 663 it drains the attraction circuit of relay 421, and at armed 665 it temporarily connects a direct positive to the called line's test lead.

   At armature 566 relay 660 closes a circuit through the upper winding of relay 620 to keep relay 620 attracted and at armature 668 it closes its blocking circuit through its lower winding and via 1 '625 earthed armature; it finally opens the original circuit for attracting the junction search relays. Relay 790 releases when its blocking circuit opens at armature 668 by the operation of relay 660. Line relay 690 when releasing, when its circuit opens at armature 664, at armature 691 opens the circuit of relay 640 which releases. At armature 642, relay 640 opens the circuit of relay 600.

   Relay 101, drawing in series with relay 660, to armature 106 connects wire 166 to wire 146 and to armature 108 closes the circuit of relay 100.



  The relay 100 attracts and the armature 105 prepares its blocking circuit.

  <Desc / Clms Page number 57>

 



   The relay 421 by attracting, to the armatures 411 and 412 closes the loop of the subscriber in series with the relays 1002 and 1007 of the junction circuit of fig. 10 which attract in scree on the loop of the subscriber. Relay 1002 to ar: ature 1017 connects the ringback tone through wire 1, lE and armatures 1020,1024 and 1027 to wire 147 and from there through the conversation wires in reinforced lines towards the calling line. The relay 1007 by drawing, to the armature 1034 connects the two windings of the relay 1003 in series with the left winding of the translator coil RO via the wires 1057 and 1056 and to the armature 1033 it closes the circuit d attraction of the slow relay 1009.

   At armature 1039, relay 1009 connects the positive oris to the normally closed springs controlled by armature 1053, through the upper bearing of relay 1012, to wire 146 to occupy the junction and maintain relays 101 and 620 attracted To the armature 1040, the relay 1009 connects the positive to the starting wire of the generator 657 to start the call rachine shown in fig. 9, to the armature 1043 it opens the circuit of the relay 1003 and connects the wire of the generator 646 to the left winding of the translating coil RC via the wires 1057 and 1056.



  At armature 1042, relay 1009 vibrates the spring 1041 in order to prepare the circuit of relay 1008.



   Relay 600 releases shortly after opening its circuit to armature 667 due to the pull of relay 660; at armature 601 it opens the circuit of relay 610. Relay 610 releases after a certain time, at armature 612 it opens the circuit which passes through the upper coil of relay 660; at armature 613 it opens the circuit passing through the lower winding of relay 620 and the circuit passing through the upper winding

  <Desc / Clms Page number 58>

 relay 630. Relay 630 releases hand relay 620 is maintained attracted by the upper winding. When the vibrating spring 1041 practically stops its vibration, the relay 1008 attracts.

   At armature 1037, relay 1008 closes its blocking circuit at armature 1032 and opens the circuit of relay 1009. armature 1038 relay 1008 connects the time release relay 1013 to the time pulse wire 655, and with reinforcements 1035 and 1036 it bypasses reinforcements 1039 and 1040.

   After a certain time, relay 1009 releases and at armature 1043 disconnects the generator from the junction and connects the junction to relay 1002
On the junction circuit at the remote office the relay 1063 of high resistance is normally attracted following the circuit: positive relay 1063, armature 1075, springs controlled by armature 1078. left windings of the RCl translator coil in parallel, wires 1054 and 1055 in parallel, left windings of the RC conveyor coil in parallel, wire 1056, armature 1115, wire 1057, armature 1043, normally closed springs controlled by armature 1034, upper coil of relay 1003, negative, Due to its resistance high the relay 1063 alone attracts following this circuit and the armature 1071 closes the attraction circuit of the relay 1062.



  When relay 1009 pulls and connects the generator on the junction, AC relay 1069 pulls. Relay 1063 releases to open the circuit of slow relay 1062. At armature 1073, relay 1064 keeps relay 1062 engaged and at armature 1072 it closes the lamp ignition circuit L to warn l. operator.



   When the attendant sees lamp L burning, she pushes the plug of her cord circuit into jack J to answer the call. Spring 1079 closes the attraction circuit of relay lQ65 - by inserting the plug into jack J, relay 1065 to armature 1075 opens the circuits of relays 1063 and 1064 to release the

  <Desc / Clms Page number 59>

 relay 1064 and prepare the circuit for supervision relay 1066. Relay 1066 is a marginal relay, it does not draw in series with the high resistance of the lower coil of relay 1003. Relay 1064, releasing, at armature 1072 opens the circuit of lamp L and 9. armature 1073 opens the circuit of relay 1062.



  Slow relay 1062 releases after a while and armature 1070 prepares the circuit for relay 1061.



   When relay 1009 releases, the generator is disconnected from the junction and relay 1003 is connected in its place. The relay 1003 attracts, the armature 1018 closes the attraction circuit of the relay 1004. the armature 1020 the relay 1004 disconnects the bell return and closes the armature 1022 / the attraction circuit of the relay 1011
 EMI59.1
 which net re-opened the vibrating spring 104: 8 to crenate the circuit for attracting relay 1010 to armature 1049.



   In the case where the calling line is that of a prepaid set, a special tone is connected to the test lead of the calling line in the well known manner and this tone is transmitted to the wire 146 by the circuits described above and thence through frame 1035 and the top winding of relay 1012 to the positive of the normally closed springs controlled by armature 1053. The tone transmitted through the top winding of relay 1012 induces an identical current in the lower winding which is transmitted through the capacitor C and the armature 1050 on the conversation wires of the junction and from there to the operator to let him know that the caller is using a station at prepayment.

   When the vibrating spring 1048 has practically ceased to vibrate, the relay 1010 is operated by means of the armature 1049. At the armature 1045 the relay

  <Desc / Clms Page number 60>

 1010 closes its blocking circuit on arrature 1023. ise to the;:; also wanders and @@ vre the circuit of relay 1011. In ar ature 1044 the rail 1010 disconnects the positive of the generator starter wire to stop the call machine and its working contacts it closes the blocking circuit of relay 1008.

   The relay 1011, by releasing, the armature 10 opens the original circuit the attraction of the relay 1010 and to the armature 1050 opens the circuit passing through the lower winding of the relay 1012 to hear the special tone.



   The operator can verify the presence or absence of the special tone by momentarily disconnecting. When the attendant pulls out her plug, relay 1065 releases and closes the circuit of relay 1063, armature 1075. Relay 1003 releases due to the high resistance of relay 1063. Relay 1003, ar ature 1018 closes the circuit. attraction of relay 1005. At armature 1024, relay 1005 opens the call return circuit, at armature 1026 it short-circuits the lower winding of relay 1001 and at armature 1025 it closes its blocking circuit as follows: positive, armatures 1025, 1028, 1014, 1051 and 1047, relay 1005, negative.

   The relay 1004 releases a little after the opening of its circuit to the armature 1018 and to the armature 1023 the relay 1004 opens the blocking circuit of the relay 1010 to allow it to release. Relay 1010 on release at armature 1044 opens one of multiple blocking circuits of relay 1008 and grounds wire 657 to restart the calling machine.



   When the attendant responds again by inserting her plug into jack J, relay 1065 attracts again to connect relay 1066 to relay 1003. Relay 1003 to armature 1018 closes the re-attraction circuit of the

  <Desc / Clms Page number 61>

 
 EMI61.1
 relay iUG-1..¯ armature 1023 relay 100'j: closes the attraction circuit of relay 1011. Relay 1011 by attracting,:. the 9.r, .a-; ure 1050 connects the lower winding of relay 1014 to the heavy junction to retransmit the special tone and -. armature 1047 opens the blocking circuit of relay 1005 to release
 EMI61.2
 this one. I free the previously described vibrating spring LC18: e U.1 intermlttent circuit of attraction of relay 1010 which only operates after a certain time.



   Relay 1010 attracts when vibrating spring 1048
 EMI61.3
 j practically ceased to vibrate, at stop 1045 it closes its blocking circuit in ¯¯eL.e ueias it opens the circuit of relay 1011. Relay 1011 releases and at armature 1050 disconnects the special tone of the wires from the
 EMI61.4
 junction. The operator will complete the connection in the known manner. Power to the caller is supplied through the windings of relays 1002 and 1007 and the app lant converses with the called party on the circuit marked as reinforced trai and through the translating coils.



     When the calling subscriber hangs up the circuit of relays 1002 and 1007 is open and these relays release. At armature 1033, relay 1007 opens the blocking circuit.
 EMI61.5
 cage of relay 1008, at frnature 1034 it disconnects the high resistance coil of relay 1003 from the junction to draw marginal relay 1066 into the TC junction circuit. Relay 1066 is a relay
 EMI61.6
 marginal, it will only operate in series with the upper winding of relay 1003. To the armature 1076 the relay: 1066 opens the blocking circuit bridged through the wires of the head and the neck of the cord circuit for donation. - supervise the operator.

   This circuit contains armature 1076 and resistance coil 1082, and the
 EMI61.7
 head and neck springs of the J. uand ltopératric

  <Desc / Clms Page number 62>

 
 EMI62.1
 withdrew its icr.e .a j-cit 1-rs springs 1079 open the circuit of the relay 1065 which releases. to the frame 1075
 EMI62.2
 relay 1C65 OJVé 1: circuit of relay 1066 and connects relay Ge high resistance 1065 to the junction.



  Relay 1G03 ro12che e = output with the high resistance relay read, 3 and 1; the lC18 armature oT. operates the celais 100-ir circuit. Releasing relay! C, 01, at aratare 1G'3 o-uvr-c '-e circuit of relay 101C to release it. Relay 1010 arrature 1044 opens the circuit of relay 1G8 to release it. n armature 1035 relay 1JC8 sup.> ri:. = e le, positive given through the upper e..wind of relay 1012 to. test lead 1â6 so that this Quie [ent is tested free and that it returns to idle, available on other calls. Relay 1012 releases without consequence at this time. The relay 1063 by drawing on the circuit of the junction, to the armature lC71: closes the circuit of attracting the relay 1062.

   TR junction and TC junction circuit are
 EMI62.3
 now in normal position available for subsequent calls.



     When the positive is disconnected from wire 146 by releasing relay 1008, cut-off relays 101 and 171 release and release relay 620 of Fig. 6 also releases. The relays that remain drawn into
 EMI62.4
 the feeder release) to return the feeder circuit to the normal position in the manner previously described.



   Incoming long distance calls are completed by the operator who plugs into the jack of the requested junction and sends the number of the called subscriber. It will now be assumed that a call coming from a remote office is intended for subscriber 336. The operator at the remote office will plug in one of the plugs of her cable circuits.

  <Desc / Clms Page number 63>

 in the jack of a junction, free leading to the local office requested, When the cord circuit is connected to the jack of the selected junction, assuming that the function shown in fig. 10 is the selected junction, the springs 1079, close the attraction circuit, from relay 1065. At armature 1075, relay 1065 disconnects high resistance relay 1063 from the junction and connects relay 1066 in its place.

   Relay 1063 releases and opens the circuit of relay 1062 which also releases.



  When relay 1066 is substituted for relay 1063, relay 1003 attracts. At armature 1018, relay 1003 closes the attraction circuit of relay 1004. At armature 1021, relay 1004 closes the circuit of armature 1036 to attract relay 1001, and at armature 1023 fere the circuit attraction of relay 1011. At armatures 1015 and 1016, relay 1001 connects the lower winding of relay 1001 in series with the right windings of the RC translator coil and wires 147 and 148.

   To armature 1050, relay 1011 connects the lower bearing of relay 1012 and capacitor C in bridge over junction wires 147 and 148, and to armature 1049 it sets vibrating spring 1048 in motion for prepare the circuit of relay 1010. When the vibrating spring 1048 practically stops vibrating, the relay 1010 attracts, at the armature 1045 it opens the circuit of the relay 1011.

   Relay 1011 releases and at armature 1049 opens the original attraction circuit of relay 1010. When the lower winding of relay 1001 is bridged across the wires of junction 147 and 148 the series attraction circuit of relays 102 , 103 and 1001 closes
The relay 102 by attracting, to the armature 109 connects the positive to the test wire 166 to mark this junction at the occupation, 1- the armature 138 it connects a negative,

  <Desc / Clms Page number 64>

   through the winding of the cut-off relay 101, through the armature 104, to the armature 110 to mark the junction on call; è;

   the armature 137 'it connects the positive to the starter wire 137 through the armature 105 to attract the starter relay 587 of the distributor in fig.5. The operations in the local office from this point on are similar to those already described for the case where a subscriber makes a call, so they will not be described in detail anymore.



   As a result of the attraction of the starter relay 587 in the distributor, the group selection relays of the latter operate in the manner previously described to operate the group finder control relay 122 in the pre-selected free feeder, after what the finder relays of Fig. 2 are operated on to find the calling junction marked with a negative on one of its wires through the winding of its associated cutoff relay 102. If the calling junction is the last line of the group of 20 the finder relay 200 by attracting will operate the line test relay 550 of the distributor.



  At armature 582, relay 550 earths wire 219 to attract relay 121. At armatures 111 and 112, relay 121 connects the wires from junction 147 and 148 to the feeder to attract relays 690 and 692.



  Line relay 690 attracting by the circuit described above, armature 691 causes relays 640 and 600 to attract as already described. As a result of the attraction of relay 600, relays 610, 620 and 630 attract as previously described and relay 620 connects the prompt tone to be transmitted to the calling trunk line. The invitation to transmit is sent through the translator coils RC and RCl to the calling operator in the well known manner.

  <Desc / Clms Page number 65>

 



   The calling operator will send the digits of the desired subscriber and under the action of the CD transmission device when the first digit is sent, the snunt springs of the CD transmission device close the circuit for attracting the relay 1067. At armature 1077, relay 1067 shunts armature 1076 and, armature 1078 disconnects marginal relay 1066 from the junction and in its place connects a direct positive through the pulse springs. When the emission device is released, the impulse springs open the circuit of relay 1003 a number of times corresponding to the number of units of the digit emitted.

   Relay 1003 releases each time the pulse springs remove the positive from the
1003 joncticn, the relay to the armature 1018 closes the attraction circuit of the relay 1005 and to the armature 1019 opens the pulse repetition circuit of the line relay 690 in the circuit of the feeder.



   Relay 1004 is kept attracted while sending the pulses due to its delay on release. relay 1005 to armature 1026 short-circuits the lower winding of relay 1001 to improve the sending circuit, to armature lC25 it closes the attraction circuit of relay 1006 as follows: positive, closed 1025, 1028 and 1014 relay 1006, negative. The armature 1031 of the relay 1006 operates before the others and closes the blocking circuit via the armatures 1021 and 1036.



  At armature 1028 relay 1006 opens its original traction circuit after closing its blocking circuit and at armature 1029 transfers the circuit of the upper coil of relay 1001 from positive & arma - ture 1036 to positive to armature 1025. To armature 103C, relay 1006 connects the positive to test lead 146 in order to keep the equipment occupied and in position.

  <Desc / Clms Page number 66>

 operated after the called subscriber has answered.



   The opening and closing of the pulse repetition circuit at armature 1019 causes the pulling of the line relay 690 into the feeder and controls the operation of the feeder relays and the pulse counting relays as described. previously to operate relay 432, since digit 3 is the rst digit sent.



  * Shortly after sending the last pulse of the first train, relay 1005 releases and at armature 1026 removes the short-circuit of the lower winding of relay 1001. At armature 1025, relay 1005 opens the circuit of the upper winding of relay 1001, but the relay remains attracted by its lower winding in series with relays 690 and 692.



  The transmitting device snunt springs open when the transmitting device reaches its normal position to cause the release of relay 1067. At armatur <1078 relay 1067 substitutes the positive through the winding of the marginal relay 1066 for the positive through the impulse springs of the transmitting device.



  Relay 1066 is marginal and draws only in series with the upper coil of relay 1003, while relay 1003 is kept drawn by the positive taken through the pulse springs of the emitting device or by the positive taken. through the winding of the relay 1006. As a result of the transmission of the following digits of the called number, the relays 1067 and 1003 attract again; relay 1003 repeats the pulses for relay 690 to armature 1019 and armature 1018 it pulls relay 1005 as above.



  Line relay 690 attracts under the action of impulses. received to cause the operation of the relay of connector 330 by the second digit and under the action of the

  <Desc / Clms Page number 67>

 third digit to select the ringing code of the calling line.



   The called line is tested as described above, the return call is connected to the connection wires 147 t 148 from where it is repeated by the translator coils RC and RCl to the calling operator.



   When the called subscriber answers, relay 770 attracts, on the loop of the called line, in series with relay 774. At armature 771, celais 770 closes the circuit for attracting celais 750 as follows: positive, armature 126, wire 187, armature 204, wire 224, armature 771, relay 750, negative. At armature 755, relay 750 loops its blocking circuit to the grounded wire 329, at armature 751 and 752 it disconnects relays 770 and 774 from the call line and to armature 753 it transfers the wire from test the called line from direct positive to armature 683 to positive through the top winding of relay 660.

   The relay 660 now attracts in the event that the line is free, at the armature 668 it closes its blocking circuit by the earthed armature 625 and opens the blocking circuit of the circuit of the relay 680 which releases. At armature 659, relay 660 closes a multiple circuit for maintaining the attracted relay I2I, at armature 663 it closes a multiple circuit for maintaining relay 430 in the operated position; at armatures 665 and 666 it loops the circuit of the upper winding of relay 620 on the positive taken at test wire 146 of the junction and brought by wire 299.



  The upper winding of relay 660 is short-circuited by the positive of wire 299 to armatures 612 and 665. At armatures 622 and 664, relay 660 disconnects the conversation wires leading to the connecting wires of the windings of relays 690 and 692. ....

  <Desc / Clms Page number 68>

 and connect those conversation threads directly. at the called line. Relay 680 releases when its blocking circuit opens at armature 668 of celais 660.



  Relay 690 on releasing at armature 691 opens the circuits of the relays 640 and 600. Relay 600 on releasing at armature 601 opens the circuit of relay 610.



  Relay 610 on releasing, armature 612 removes the short circuit from the upper coil of relay 660 and armature 614 opens the blocking circuit of relay 740 to reset its release.



   When relay 660 pulls and disconnects relays 690 t 692 from junction wires 147 and 148, relay 1001 from junction line TR releases.



  To the armatures 1015 and 1016, the relay 1001 connects the relays 1002 t 1007 to the connection wires 147 and 148 and connects the capacitors C, between the right windings of the translator coil RC. Relays 1002 and 1007 draw in series over the called subscriber's line loop. The attraction of relay 1002 at this time is of no consequence. Relay 1007 pulling armature 1034 incorporates the high resistance winding in series with the top winding of relay 1003 to release marginal relay 1066 at the remote office. At armature 1076, relay 1066 closes a loop comprising impedance 1082 on the head and neck conductors of the operator's cord circuit to give the operator supervision of the response, in the well-known manner. .

   Power to the called subscriber is supplied through the relay windings 1002 and 1007 on the conversation wires marked in heavy lines.



   After the conversation, and because the called subscriber has hung up, relays 1002 and 1007 release.

  <Desc / Clms Page number 69>

 



  At armature 1034, relay 1007 disconnects the lower winding of relay 1003 to trigger the release of relay 1066. At armature 1076, relay 1066 opens the bridge comprising coil 1082 of the head and neck conductors of the circuit. operator's cord, to give end supervision to the operator. The operator removes the plug of her lead circuit from jack J, thereby opening the circuit of relay 1065. When arming 1075, relay 1065 opens the circuit of relay 1066 which releases and, at its normally open contact again closes the circuit of the high resistance relay 1063. When arming 1071, the relay 1063 closes the attraction circuit of the relay 1062.



   Trunk line relay 1003 releases when connected in series with high resistance relay 1063 and to armature 1018 it opens the circuit of relay 1004. Relay 1004, when releasing, to armature 1021 opens the blocking circuit of relay 1005 which thereby releases and at armature 1023 opens the circuit of relay 1010 which also releases. Relay 1006 to armature 1030 disconnects the positive from test lead 146 to allow relays 101, 471 and 620 to be released. Relay 471 on releasing, releases relay 470 and returns the line circuit to the normal position. The cut-off relay 101 releases and causes the release of the relay 100, it puts the junction line circuit back in the normal position.

   Relay 620 releases when the positive is removed from conductor 299 to release relay 1006 which disconnects the positive from wire 146, at armature 622 it disconnects ground from wire 188 to open the blocking circuit of relays 122 and 200.



  At armature 625, relay 620 disconnects the positive of wire 329 to open the blocking circuits of relays 660, 750, 432 and 330. All relays, in the circuit

  <Desc / Clms Page number 70>

 and the junction rails now return to their normal position.



   In the event that my called line is busy at the time of the call, the 670 relay is drawn instead of the 680 relay, it connects the busy tone on the conversation wires marked with reinforced lines and sending to the operator. When the attendant hears the busy tone, she removes her plug from the jaok to release relay 1065 which connects the high resistance winding of relay 1063 in series with relay 1003 of the TR trunk line to cause the release of relay 1003. In this case, relay 1003 by releasing at armature 1019 opens the loop which extends towards the junction and at armature 1018 opens the circuit of relay 100-1 :. Relay 1004 by releasing at armature 1021 opens the circuit of relay 1016 to cause its release.

   Relay 1006, on releasing, causes release of the junction in the manner previously described, and further releasing relay 620 to armature 624 opens the blocking circuit through the upper winding of relay 670 for cause it to relax.



   When a fault occurs at the local office, the operator of the remote office is informed of the nature of the disturbance by a series of tones which is sent to her on one of the junctions when she answers a fictitious call. There can be three causes of disturbance which can cause the seizure of the particular junction, if it is free, to warn the operator at the remote office. The first of these faults may be the lack of ringing current or a fault in the code switch; the second, the faulty charging equipment; and the third, the melting of a fuse associated with a power supply, a junction or the AS alarm transmitter fig. He.

  <Desc / Clms Page number 71>

 



   As described above, when the calling machine does not provide ringing current, relay 958 does not operate and therefore the circuit of relay 938 is not closed. Relay 938, in this case, maintains ground to the alarm wire from generator 1198 to armature 982. Likewise, in the event that the code switch is not functioning properly, either because the positive is not disconnected from the guard wire H to release the relay 959, or the negative is not connected to the choice wire PU to cause the intermittent operation of the relay 960, the relay 938 releases and earths the alarm wire of generator 1198.

   When the 1198 generator alarm wire is grounded, a circuit closes to cause the pull of relay 1103 as follows: positive, armatures 982 and 978, 1198 generator alarm wire extending to fig.ll, armatures 1177 and 1128, relay 1103, negative. The relay 1103 vibrates its spring 1114 to prepare the attraction circuit of the slow relay 1102 which will only operate when the spring 1114 practically ceases to vibrate. Momentary grounding of the 1198 generator alarm wire during normal calling machine and code switch operation is not long enough to cause relay 1103 to be held in the pulled position for sufficient time to cause the attraction of relay 1102.



   In the event that the battery charging equipment (not shown) fails, the charge alarm wire 1197 is grounded to cause the pull of the relay 1103 via the armatures 1181 and 1129.



   In the event that a fuse associated with the AS alarm transmitter blows, the negative is connected by the wire of the

  <Desc / Clms Page number 72>

 fuse through the lower winding of the 1159 fuse alarm relay to positive, to cause the pull of this relay. In the event that a fuse associates with any of the trunk lines, except the alarm trunk, jumps, the negative, '-% through the top coil of relay 1013 is connected via wire 1059 and through it will wrap from relay 1159 to ground. Relays 1010 and 1159 attract through this circuit.



  Relay 1013, at armature 1052, connects armature ground 1036 to junction test lead 166 to mark junction at busy. In the event that the fuse associated with the alarm junction blows, the negative is disconnected from relay 1003 as a result of the blown fuse and as a result, relay 1063 of the TC junction circuit at the remote office drops.



  Releasing relay 1063 causes relay 1062 to release and closes the circuit of alarm relay 1061. Relay 1061 attracts and, at armature 1068, closes its blocking circuit by the positive of key K. armature 1069, relay 1061 closes the operating circuit of alarm bell B. When the attendant answers, she finds the junction isolated and she receives no tone, which indicates to her that the fuse of the particular junction is blown .



  In the event that the fuse associated with any feeder blows, for example the fuse shown in fig. 6, the negative is connected through the upper winding of the relay 604 and through the wire 1059 to the positive to attract the relays 604 and 1159. At armature 605 the relay 604 puts the guard wire 616 to the ground to mark the armature at occupation and at armature 606 it disconnects the positive of the occupancy wire from all

  <Desc / Clms Page number 73>

 feeders 629. To armature 607, relay 604 connects the cut-off wire 649, earthed, to wire 219 instead of earth to its normally closed spring and to armature 608 it disconnects the wire from Pulse in time 659 from the lower winding of relay 604 and in its place connects earth to armature 608.



  When fuse alarm relay 1159 is attracted to armature 1190 it turns on the fuse alarm lamp, at armature 1189 it closes the attraction circuit of felais 1103.



   When the alarm trunk is in use, test lead 166 is grounded through the TLR trunk line relays of fig. 1 to prevent interference to the operation of the trouble alarm and the conversation on the same trunk. The positive to wire 166 closes the circuit for attracting relay 1101 via armature 1116. At armature 1111, relay 1101 maintains the relay normally attracted 1104 in the operating position, independently of the armature. state of relay 1102. Since relay 1104 is maintained by relay 1101 as long as the trunk is occupied, the trunk line is not picked up by the alarm transmitter as long as the trunk line is not not become free.



   As has been said previously, the relay 1103 attracts for sending the various disturbance signals and prepares the attraction circuit of the relay 1102.



  When the spring 1114 practically ceases to vibrate, the relay 1102 attracts and opens the circuit of the relay 1104, in the case where the relay 1101 is not attracted. In frame 1116, relay 1104 disconnects relay 1101 and connects the positive to wire 166 to occupy the trunk line for any incoming call by attracting cutoff relay 101.

   At armature 1115 the relay

  <Desc / Clms Page number 74>

 1104 disconnects wire 1055 or wire 1057 thereby opening the junction, to cause the release of relay 1063 at the remote office. At armature 1117, relay 110 closes the attraction circuit of ielais 1105. Relay 1105, attracting, to armature 1118 earths the starter wire uu Generator 657 to start the machine. 'call and @ armature 1121 it closes the attraction circuit of relay 1107 through the intermediary of armature 1125. At armature 1119, relay 1105 vibrates spring 1120 to prepare the slow relay circuit 1106.

   The relay 1107 attracts its weighted armature 1126.



   When the junction line is open at armature 1115, relay 1063 releases and at armature 1071, opens the circuit of relay 1062. Relay 1062 releases and at armature 1070 closes the draw circuit of the alarm relay 1061 via armature 1074. At armature 1068, relay 1061 locks on alarm release key K and at armature 1069, operates alarm bell B to warn the operator.



   When the vibrating spring 1120 has virtually stopped vibrating, the relay 1106 attracts and to the armature 1122 connects the jumper wires 1056 and 1057 to cause the re-pull of the relay 1063 at the remote office. At armature 1124, relay 1106 grounds wire 148 and at armature 1123 it connects the negative through the coil of relay 1109 to wire 147 to prepare the pull circuit of relay 1109. A armature 1125, relay 1106 connects resistor ZA in series with relay 1107 and also loops the short circuit of relay 1107 coming from negative to armature 1126. Relay 1107 releases due to this short circuit and at armature 1126 opens this short circuit.

   Relay 1107 is now

  <Desc / Clms Page number 75>

 attracted to the earth 3 armatu e 1121 -. through the resistance ZA and while operating, it short-circuits again: the armature 1126. This cycle of operations continues and during this time the vibrating spring produces periodic variations in the charge of the capacitor YA, since relay 1107 short circuit is open and closed.

   In this way, a special alarm tone is generated and sent to the trunk. When the operator answers, relay 1165 is pulled in and, through jack spring 1079, opens the original circuit for pulling relay 1061 to armature 1074 and armature 1075, it substitutes the winding of relay 1066 for relay 1063.

   When relay 1066 is incorporated into the junction, relay 1003 attracts and at armature 1018 closes the attraction circuit 1004. At armature 1023, relay 1004 closes the attraction circuit of relay 1011 through springs normally closed and controlled by armature 1045, at armature 1021, it completes the attraction circuit of relay 1101 through armature 1036 Relay 1011 attracts as before and to the armature vibrating 10.SE, prepares the attraction circuit of relay 1010. Relay 1001 by attracting to armatures 1015 and 1016 connects the winding: lower ent of relay 1001 in series with the right winding of the RC translating coil and the wires 147 and 148 to close the attraction circuit of relay 1109.

   At armature 1131, relay 1109 connects the invitation to transmit to wire 147 coming from the invitation to transmit wire 648 through armatures 1176 and 1166. The invitation to transmit is induced in the left winding of the translator coil RC and is transmitted by the connecting son 1054 and 1055 to the operator in known manner. To armature 1134, relay 1109 connects a

  <Desc / Clms Page number 76>

 multiple positive to relay 1103, so that relay 1103 will remain on until the tone cycle is complete. At armature 1132, relay 1109 closes the attraction circuit of relay 1108. Relay 1108, by attracting, at armature 1127 cuts off the attraction circuit of relay 1151 through armatures 1173 and 1164.

   With the armatures 1128, 1129 and 1130, it opens the original attraction circuit of the relay 1103 and with the working contacts of these armatures, it closes the blocking circuit by one of the relays 1156, 1157 and 1158, depending on the particular fault that occurs. 'is produced. In the event that the fault is a call group alarm, relay 1156 is drawn to the alarm wire of the earthed generator 1198. It is blocked by its armature 1178 and to armature 1179 it connects the generator alarm tone. In the event that the fault is a fault in the load machine, the alarm relay 1157 is attracted by the alarm wire of the group grounded 1197. It is blocked by the armature 1182 and to the armature. 1183 it connects the alarm tone.

   In the event that a fuse has blown, relay 1158 attracts via the positive taken through armatures 1189, 1185 and 1130. At armature 1186, relay 1158 closes its blocking circuit and at armature 1186. armature 1187, it connects the alarm tone. At armatures 1180, 1184 and 1188, relays 1156, 1157 and 1158 respectively, complete the circuits of the alarm lamps of the generator, the load group or the fuse.



   The relay 1151, by attracting, operates its spring 1163 which vibrates and when this spring has practically ceased to vibrate, the attraction circuit of the slow relay 1152 closes through the armature 1162 and the positive to the armature 1127. At armature 1164, the relay

  <Desc / Clms Page number 77>

 1152 opens the circuit of relay 1156, at armature 1155 it closes the circuit through the upper winding of relay 1153 and at armature l156 it suppresses the invitation tone to transmit from wire 1199. On contact on of armature 1166, relay 1152 connects the alarm tone to wire 1199, in case the fuse alarm relay 1158 is pulled.

   This circuit is extended to the operator through the YA tone capacitor of armatures 1187, 1169, 1166, wire 1199, armatures 1131 and 1123, wire 1147 and the junction.



   The relays 1153, 1154 and 1135 are two-stroke relays, they only attract their armatures 1168, 1171 and 1164 at the first stroke, when they are energized through their upper winding. Relay 1153 attracts at the first step, via armatures 1165 and 1167. At armature 1168, relay 1153, at the first step, short-circuits its lower winding. Relay 1156 releases after a certain time and at armature 1162 opens the circuit of relay 1152. Relay 1152, on releasing, at armature 1166 disconnects the alarm tone in case the alarm relay of fuse 1158 is drawn; at armature 1164 it again closes the attraction circuit of relay 1156 and at armature 1165 it removes the short-circuit of the lower winding of relay 1153.



  At the rest contact of the armature 1166, the relay 1152 again connects the invitation to be transmitted on the junction line. Relay 1153 draws in 2nd step and armature 1167, opens its original attraction circuit and prepares the circuit for two-step relay 1154. At armaturell69, relay 1153 opens the circuit for the alarm tone of fuse and its contact to work prepares the circuit of the alarm tone of the group of

  <Desc / Clms Page number 78>

 charge.

   The shimmers 1151 and 1152 operate in the manner described above and the relay 1152, the armature 1164 opens the circuit of the cell 1158; at armature 1165 it closes the attraction circuit of relay 1154, at the first time, through its upper winding.



  Relay 1152, at armature 1166 disconnects the transmit prompt and forms the circuit giving the alarm tone if the load group 1157 alarm relay is pulled. This alarm circuit is extended to the operator via the tone capacitor YA, the arches 1183, 1172 and 1156 and the circuit traced previously to the wires of the junction. Relay 1154 only draws its armature 1171 at the first stroke and short-circuits its lower winding.



  Relay 1151 - releases again and to armature 1162 again opens the circuit of relay 1152. Relay 1152 when releasing, to armature 1166 disconnects the alarm tone if it has been connected and 3 its contact on idle, reconnect the prompt tone to be transmitted to the trunk line. At armature 1164 :, relay 1152 again closes the attraction circuit of relay 1151 and at armature 1165, it removes the short-circuit of the lower winding of two-stroke relay 1156 to allow the latter to attract for the 2nd time.



  The relay 1154, by attracting, at the 2nd step, to the armature 1170 opens its original circuit to attraction and with its contact at rest prepares the circuit of the two-stroke relay 1155. At the armature 1172, the relay 1154 disconnects the circuit. alarm tones in the event that the load group alarm relay is attracted and its contact at work prepares the alarm tone connection circuit in the event that the generator alarm relay 1156 is attracted.



  With relays 1151 and 1152 operating again as described previously, relay 1152 opens the circuit

  <Desc / Clms Page number 79>

 relay 1151. At 1'-mature 1165, it closes the
 EMI79.1
 circuit è.'c.tt :: "3ctiG; :: from: ela1s l two times 1155, to p :: 'er, lÍr time, .t 1 stop; atu-e 116, it disconnects the invitation u transmit -t co-infects the dial-off tone, e "It binds it to a junction, in 1'3 case where the du. relay of aL, rr,: e ':: ener.3.tor 1156 has attracted.



   Relay 1151 releases again and at armature 1162 once again opens the circuit of relay 1152. Relay 1152, releasing, at frame 1164 closes the circuit of relay 1151, at frame 1165 it removes the short-circuit of the winding
 EMI79.2
 will be inferior to relay 1155, to armature 1166 it suppresses the alarm tone and connects to its
 EMI79.3
 places the invitation to be transmitted on the trunk line. The two-stroke felais 1155 attracts in the second stroke; at armature 1173 it opens the circuit of relay 1151, at armature 1154 it opens its original pull circuit and at armature 1176 it disconnects the invitation to be transmitted and connects the tone in its place occupancy at the junction line.

   From the above, it can be seen that when the attendant responds to an alarm signal, she first hears the invitation to transmit.



  The invitation to transmit is then followed either by the alarm tone to indicate to the attendant that a fuse is blown or by a period of silence to indicate that no fuse alarm has operated. After sending the alarm tone or after the silence period, the prompt to transmit indicates the end of the fuse alarm test. The prompt to transmit is again followed by either the alarm tone to indicate that the load equipment is faulty or by a period of silence to indicate that the load equipment is operating properly. The invitation to send after sending the alarm tone or after

  <Desc / Clms Page number 80>

 the period of silence, indicates the end of the test of the charging equipment.

   Once again, the invitation to transmit is followed by either the alarm tone to indicate this time that the equipping. The ringtone works properly. The prompt sent after the last alarm tone, or after the silence period, indicates the end of the alarm equipment test.



   When the attendant, by removing her plug, cuts the connection, relay 1065 releases. Therefore, it releases the relay 1066 -t connected the high resistance relay 1063 to the junction. As a result of the high resistance of relay 1063, relay 1003 of the TR junction drops. At armature 1019, relay 1003 opens the bridge holding relay 1109 attracted and at armature 1018, it opens the circuit of relay 1004.



  Relay 1004, when releasing, at armature 1021 opens the circuit of relay 1001 again and at armature 1013, opens the circuit of relay 1010. At armatures 1015 and 1016, relay 1001 reconnects relays 1002 and 1007 over the junction, thereby restoring the TR junction line to normal conditions. Relay 1109 releases when this circuit is opened by relay 1003. At armature 1132, it opens the circuit of relay 1108 and at armature 1134, the circuit of relay 1103. Relay 1108, when releasing, at the armature 1127 opens the blocking circuits of the 2-step relays 1153, 1154 and 1155 to cause their release. The relay 1103 when releasing, the armature 1113 opens the circuit of the relay 1102 which therefore releases.



  At armature 1112, relay 1102 closes the pull circuit of relay 1104. At armature 1116, relay 1104 disconnects the positive of test lead 1166 to release cut-off relay 101 from the trunk line circuit and to make the junction alarm

  <Desc / Clms Page number 81>

 free for incoming and outgoing calls. armature 1115, relay 1104 connects wire 1056 to fi 1057 and to armature 1117 works the circuit of relay 1105. Relay 1105 when releasing, armature 1118 disconnects the positive of the generator start wire 657 day stop the ringing machine, at armature it opens the circuit of relay 1107 and at armature 1119 it opens the circuit of relay 1106.



   Relay 1107 releases and returns its vibrating armature 1126 to the normal position. All the relays shown in the alarm transmitter are now in normal conditions, except for the particular alarm relay which operates as a result of the fault and which ballasts blocked in the operated position by its blocking circuit until c that the disturbance has been removed.



   Provision has been made for the attendant to make a special call to a determined number in order to receive the various alarm tones to determine whether the fault has been resolved or not. This test number corresponds to the number of the line which has been reserved for this purpose and the operator for performing a verification test operates on this logne in the same way as for calling a local subscriber. The attendant therefore inserts her plug into a free jack and causes the connection of a free feeder. the junction in the manner which has been described above. After the connection of the feeder -'-) the junction, the attendant transmits the test number to connect the feeder to the test line.

   The feeder circuit connects the positive to the test wire of this line, this test wire is connected to the upper winding of relay 1110 in fig. 11 At armature 11 @ 5, relay 1110 closes its blocking circuit through its lower winding and the arma-

  <Desc / Clms Page number 82>

 
 EMI82.1
 'cure: .ise the earth lisé; The armature 1136 it iron: ¯s =, circuit of attraction 12i-j. The operator then withdraws from 1 junction, from the Lani '. :::' e described. ::: C'céde ': -,.: Ent. The f: m ::: tÍcr: ¯> 3.:G!2.t of the relay ¯1 ;; causes the transmission of all tones on the junction. -, al4r :: e of the. ani re described - ',; cjde ..- = J.ent.

   Jans this oL however, when the relay 110 .. attracts, the armature llj.3 it opens in circuit of 51 - aoue 1.a =: lais 1110 for) r.) V'Jc:. 'J.8' :: 'the i; razi orL of: this one. arma ', ure 116, relay' ¯110 opens the circuit .L = relay 1105. If the 1µrangement still exists, a> -es alarm relay: .. e 115G 1-57 or 1153 is in mositici , erased and the number hears the alarm tone te. = ps au. oment opportun pendam: sending the series of tones.

   If the fault has been removed, the alarm relays 1156, 1157, 1158
 EMI82.2
 and 1159 are all in the .or ::: ai position and the attendant does not hear 19. li'a1ar.l8 dial tone, which indicates that the fault has been resolved. When the attendant bends the connection, the equipment returns to the normal position as described above.



   Timed disconnection has been revised to release feeder circuits and junction circuits when they are held by a Remanent loop. The
 EMI82.3
 Ali circuit: ¯entor is considered CO! .1me being maintained by a permanent loop under the following conditions: 1) When the calling subscriber neglects to complete the connection to the called line; 2) When the calling subscriber neglects to hang up after making a call and 3) When the calling subscriber neglects to hang up harshly: having received busy tone.

   A time device is provided at pin 11, to ground the time pulse fi '655 and the time cutoff wire 649 of the determined intervals.

  <Desc / Clms Page number 83>

 
 EMI83.1
 



  ;: Jil 1 = ;, t ... J0 1.> .; z 2 1 # wanders,: .5 1, = - 37'sl:,: 'a -.l -::.,) .3 f3 :: - ¯i ,, s': J .. e follows: the springs 1; '¯o = m., :: ", ¯1 sort r :::;' 23 = 1 = .i,> Ai; àoi, ient r-, ur ab 1 the circuit t ù 'at t, a.ct ;: eu but 113G. The relay oc in a; tin¯.¯ arraturs 1: ... 1 1.µ.e> n, scte lia the ground of the wire] 2 coar t: ¯¯¯: 8 41 = z rar ± # circuit of attraction =. ;; = -Il * 1: 11..L. L ± relay = - L .fi-: 11, ... 1 by attracting, 'i have it 1.0' rf) re the circuit con: - .. 3xi3n. du: positive bare wire = '1: julsion, i.2: ¯: i) S 1: ... 55. l..s clock springs: 2 . St0'a'vl'I'¯: ... ¯Ir.: S a period of - :; n9S deter..in8r-; 90U.I rovoōuer rz 1 -e ii t relay 11C. armature 11.1 1;:; - # iz :: 2C vre Ij slow relay 1101 circuit and connect the earth to the break wire teaps 64: 9.



  .Following the characteristics of relay 1161 which is ienf "-. ' "-,": '- "- 1 ,; ¯? Leave remains attracted during slow release ..- nt, relay remains ittirë for a certain t-2r.c ') S, C.¯'LS When relay 1100 has released and during this period it connects the positive to the wire pulse te: ips -1. ar - '. ature 1195. wuand the relay
 EMI83.2
 1 eye releases, the positive is removed from the pulse wire
 EMI83.3
 2. t3LJ? S;:. 55 armature ll ±.: I..2during the following period- -: ante of: ';: mctioIL.'1'Sc.:. Ent, the clock springs 1134 iron Slow the circuit of relay 1160 again and the relays operate in the same way as described above. When a feeder circuit is entered, the lower winding of the time release relay, such as relay 504, is connected to the time pulse wire
 EMI83.4
 655.

   In the event that the feeder circuit is not in the conversation position, that is to say in the AC where relay 770 has not operated to open the circuit of the
 EMI83.5
 relay ë04 1. armature 773, the positive on the impulse wire at time 655 closes the relay attraction circuit. - at the ica armature, relay 604 is blocked in
 EMI83.6
 position attracted independently of the device on the wire

  <Desc / Clms Page number 84>

 
 EMI84.1
 , é¯'1;: pulsEJn '. e ps 55. -'mature 207, the relsis Cj: ir-5:; st re 1 cir .1: du '-'Lils; c 1.jne of the caercheur th group, such as the c-; 1. il ...; O, from the direct positive l-l ''): sort .1Or, .- C.L. é: .H 8 # i'r-l c 1 rol. "" L 'ce aiii-enteur to the positive on li i'il this cut off teir-ps û49..ri. the'Oc, 1; relay ';; CJ:

   cc; n¯1ect one of the multiple connections to the land of the thread 'the occupation of all ali enters :::: ..; 9 and'. t%: r ¯cz t a'f3 5C5:. "¯ = il'¯t. '.'. nt the positive 3J.r 1 # il de arde olë = our occ = 1> Jer the circuit of this alī ¯ent :: ur. Ai the editor se .-: and in the converse position before the positive is removed from the cut-off wire 646, the relay 770 will draw through the inter-
 EMI84.2
 The loop 6aiaire to the ringed subscriber and ar :: ature 773, it will open the circuit of relay 604 which releases.



  However, if the 770 relay attracts a case before the pos
 EMI84.3
 tif is suporiié of the cut-off wire u ter:, is 649, the disconnection of the positive of this wire, following the operation of relay 1160, causes the release of the line relay of the group finder 120. The release of the relay of li -; ne of the group finder opens the circuit of relays 690 and to? 2 of the alienator, which causes their release. The release of these relays causes the return
 EMI84.4
 in the normal position of all the feeder relays in the manner described above. In this case, relay 610 to armature 615 opens the circuit of relay 604 which releases. At armature 605, relay 604 disconnects the positive from ground wire 616 to release the armature.



   When a subscriber neglects to hang up or in the event that a loss of insulation on the line is sufficient to operate one of the line relays, such as line relay 172, that line is considered retorted as a permanent loop. When the feeder circuit is loose

  <Desc / Clms Page number 85>

 and the cutoff relay circuit, such as relay 171, is open, either after one. incoming call has been completed or after the line has been automatically disconnected from the feeder, relay 171 returns to the rest position, at armature 178 it opens the circuit of relay 170 and at armatures 177 and 178 it connects relays 173 and 172 to the line.

   The relay 172, by attracting to the armature 179 '- and? -. earth the test fi to mark this line as busy for incoming calls and at armature 181 it closes the blocking circuit of relay 170. Relay 170 is kept operated by its armature 175 and it prevents the setting to be made. ground of the starter wire 137 which terminates at the distributor. At armature 174, relay 170 prevents connection of the negative through cut-off relay 171 to avoid false marking of the line as calling state in the seeker group. When the permanent loop is removed from the line, relay 172 releases and at armature 181 opens the blocking circuit of relay 170.

   At armature 179, relay 172 removes the positive from test lead 156 to free the line.



   Timed release relays on the trunk lines, such as relay 1003, of the TR trunk line fig. 10, prevent the trunk lines from being held indefinitely in the event that the attendant leaves. to answer or in the event that the calling subscriber does not hang up after the conversation and when the attendant has already cut the connection.

   After the conversation, the attendant cuts the connection causing the relays 1003, 1004 and 1010 to be released as described previously. At this moment, only the relays 1008, 1007, 1002 and 1012 are in the operated position if the subscriber no. did not hang up. When relay 1010 releases, it connects the

  <Desc / Clms Page number 86>

 
 EMI86.1
 The pull wire is the lower winding of the release relay. is there. .Janà the impulse wire i 8..l = -, S c55 est. is 1 earth; the relay li13 attracts and the armature lC5.:!:

   COl1: e C e a direct positive -'- the place of the positive given by 'The wire of i..9ulsi: m. tecp 55 to ... keep the relay HERE.-) o? 1 '' '; iiidperformance of the impulse wire at te'9s, 3i. -i the arraaiure ïv5, the relay! Clj transfers the upper ent = o.J1 # 1-ent of the relay 1012 from the direct positive to the positive on the cut-off wire a terif ci9. If the disturbance persists, the positive is disconnected. 'L8cté of the cut-off wire at tarips, 5Ll has] 1'3S some tarnished and disconnecting the positive opens the circuit of these relays 1012 and 101. Disconnecting this positive also suppresses - the L marking the occupation and opens the circuit
 EMI86.2
 of the relay in the circuit of 11 - ij, -entor. When the u2C relay releases, the aligner circuit is returned to the normal position ccr, -., 2e described above: 1ent.

   Releasing the cut-off relay 101 returns the trunk line circuit to the normal position. / When the alienteur circuit is released, the relays by releasing open the circuit which ends at relays 1002 and 1007 which release under these conditions. - armature 1033, relay 1007 opens the circuit of relay 1008. At armature 1038, the relay opens the circuit of relay 1013 which releases and replaces junction line TR in normal position.



   Each feeder circuit is provided with separate fuses and the negative is fed to all relays and connections in the feeder through coils I, II, and III of relay CB in multiple. If the current consumption for one of the feeders exceeds a determined value, that is, for example, for the circuit of the feeder shown in fig. 6, the CB relay in fig. <operate.

   At armature 645, relay CB opens the negative circuit through the winding? I, at armature 644 it opens the circuit of the power supply through its

  <Desc / Clms Page number 87>

   rolling .' II and ar azure 646, 1 it closes the attraction circuit of relay 50 in series with relay 1159 of le. done. It through wire 1059.



  Operation of the wire fuse alarm relay causes the fault alarm to be transmitted over the alarm junction as described above. The slow operation of relay 604 at armature 605 .. and earth the guard wire ô16 to occupy the feeder circuit and at armature 606 it removes one of the multiple devices of the occupying wire of all Feeders 629. The high resistance of winding III of the CB relay prevents excessive current draw in the feeder and may cause some or all of the operated relays in the feeder to drop.


    

Claims (1)

EMI88.1 1 .. bystcr-ie The teīīome (.; Ù ...) reIl8nt several:.; RoU.:8S t-.e 12-- -nes and ", eu :: groups this relay cor, uzuns -isrosés ¯.our se ect u..e 11 ne calling uuanu ur .: ppel is c; put on these lines and in which a relay in a Group is operated to cause the arq. cee ue the calling line in the second group of relays who then operate in sequence to EMI88.2 find the line applet. A telephony system as claimed in claim 1 in which each relay (relay EMI88.3 (the oupe) where u 'connect the corresponding group. h a t-ifferent croup ue li <g # es each having them being disposed to operate the connection e son to a test uu group ue li. corresponding to the secona -; relay cut (gleam of a. tee). EMI88.4 0 .: systeue ue tl¯ .o.zie co;, iprei1 = nt several circuits, 'wlii - entor.-Attached each to two Relay groups. oonhie re-energized., ans ss income 1 or = in which the relay in a group corresponding to the called group is selected by another group of relays common to all the circuits. EMI88.5 4. There is a telephone system that connects several groups. The lines and a rump a relay common to these lines People who, when a call is made, relays are operated up. that the calling group has been located. 5. A telephone system comprising several feeder circuits and a group of relays for selection. EMI88.6 of a free feeder circuit which operate in sequence, until a feeder is located. 6. A telephony system as claimed in claim 5 in which a separate selection relay EMI88.7 provided = for each clinenteur, one relay being normally attracted when one or more of the <Desc / Clms Page number 89> EMI89.1 tor = have Free and each one c ... es = eh is stent c.is::oso to revoke, when T 7, ir c, the cut, "a cir- cuit c, e L: i..OCL ; e u .. connected is ¯rec auent, preselect the 1 corresponding liar = orcGnt to put it into service and prepare the circuit. The attraction of the next relay in the chain. EMI89.2 7. A sj-st3ze The telephony comprising an ali- ... entor circuit having access, several ..: 1'oufes this lines and coi.:pren:nt a relay .e group and releis of ' unit in which ..uc.nu uns linked is .IDDelente or on the picture u to be .¯pelée a relay (the {group is arranged EMI89.3 - to operate on. connection LU he ue test of the uite li "ne ue circuit ue 1 '' linker, a second group relay being operated later to connect the line wires when the line state: calling or free, has been verified in the feed it EMI89.4 8. A c.e telephone system co. r: e claimed in claim 7 in which a first group relay is arranged to connect the test eyes of all the lines of the group corresponding to a set (the unit relay ui operate in sequence to select this line what she calls. 9. A telephony system as claimed in claim 7 in which the first group relay is arranged to connect the test leads of all the cables. EMI89.5 lines uu corresponding group, -undant 1 a set (the relay a'u: tee, and have one of these is operated according to the number of units of the line called to select the wires going to this line. 10. A telephone system comprising a supply circuit having access to subscriber lines and to trunk lines in which, under the action of a cipher resigning a long distance call, corresponding relays at the junction lines operate in sequence <Desc / Clms Page number 90> EMI90.1 'lS': 1U ':, ce ç-i ", ine 1 t \ .-. 2" :: c -, - :. or .Free, -8.ns ie -Skirt be found. he. : n system a selection cOElpreELnt a group L.e rah \ .. 8 selection a-ns which the circuit used at the first relay includes the break contact 1 I all the relays in series, the circuit ..: second coi relay, ==; returns a working contact, -, u first relay, 1 circuit wa third relis coLiprenu. a contact ae -, enos in the first real 1s and n work contact zou 1..6uxièn: th relay "tc, the circuit a 's 1 trc c tion c; tEnt us this has referred to: -utor .; at14 # ei.ient de c, - teun uses shine u next day prov ld.Ut;: c le: orietionuement, -, are relays in sequence. 12. '711 uispositif, -' send 1J'i1apulsions including a relay, -ce li = ne (190) a relay ú.'Ü: pulslon (ü40) and repeater relay 'ir: puïsiun (' 70Cj controlled by relay n 'impulses uin which the circuit uu pelai. a'iMpulses is jointly controlled by the line relay and the repetition of the pulses relay- 1 ¯,. The telephony system in which the caller 1 is controlled subscriber called on a line grouped by sending the last digit of the number of the called subscriber, the very previous cs are used for the selection of the said line, the occupation or accessibility of which is tested on receipt of the first pulse from the last digit. 14. A telephone system comprising several ringing code wires and arranged so that two series of short ringing rings are transmitted when only one of these wires is selected while one long ringing ring and a series of ringing rings. Short @ ring bells are transmitted when a combination of these wires is selected. <Desc / Clms Page number 91> 13. A telephony system as claimed in Claim 14 in which the ring code wires are in several feeder circuits and are selected under control of the feeder circuit connection relays. ali-enteur, a code switch composed of relays common to the feeders being activated to connect a voltage source to these wires in determined code combinations. 16. A telephony system in which the same line is selected by sending one of two different group selection digits and the same digit-units and in which by sending a call code digit One or two different ring codes are transmitted depending on the value of the group selection digit. 1 @. A telephone system as claimed in resale, -14.cation 1 @ in which the ringing code is transmitted on the positive or negative line wire depending on the value of the ringing code digit. 18. A telephone system com claimed in claim 15 or 17 in which the ringing wire is temporarily grounded after each call period to discharge the ringing capacitors of the called line. 19. A telephone system comprising devices for automatic transmission to an attendant at a remote office of signals indicating faults in another office, in which said signals comprise a series of tones, an alarm tone being inserted. between some of them. 20. A telephony system as claimed in claim 19 in which means of verification are provided. <Desc / Clms Page number 92> provided to make repetition of said signals possible under the operator's control. 21. A telephone system comprising feeder - finder - connector circuits - composed only of relays, for the establishment of local communications between subscriber lines and of interurban communications between trunk lines and lines. of subscribers, in which the conversation feed! is supplied by the feeder in the case of a local call, while the power of the conversation in the case of long distance calls is supplied to the local subscriber by the trunk, the power source of the feeder circuit being disconnected.