BE475355A - - Google Patents

Description

       

    <Desc / Clms Page number 1>
 



  Telephone network -------------------
The present invention relates to telephone networks, and more particularly relates to improvements in equipment suitable for converting a semi-automatic network in which recorder markers manually controlled by an operator are used for the control of switches. automatic., to extend the connection to the called line, in a completely automatic system, in which all switch control operations are carried out by the calling subscribers, without operator intervention.



   When carrying out a conversion of this kind it is desirable, for the sake of economy, to use the switches of the automatic system as much as possible, with only a minimum of changes. In practice, this means that the existing switches have to be modified so that the recorders themselves have to be completely re-adapted to be able to accept dial pulses from calling stations, and automatically perform the functions previously fulfilled. by one

  <Desc / Clms Page number 2>

 operator. It may also be desirable, when making a conversion of this kind, to add new automatic equipment to this switching or to replace existing analog equipment.

   New equipment can be. or not provided for the same type of control action by recorders-transmitters as the existing equipment. For example, existing switching equipment can be designed to allow feedback control of recorders during link establishment, while new equipment can be designed to receive control pulses directly. a recorder-transmitter, during the establishment of a link,

   without exerting any control action on the pulse transmitter equipment of the recorder-transmitter used.



     In accordance with one characteristic of the invention, each recorder-transmitter is designed to exercise one or the other of two control action modes of the associated automatic switches,

   and the character of the control actions exerted in directing a communication to its destination is automatically adapted to the type or types of control actions received by the automatic switches through which the communication is to be routed, and is determined. preferably in agreement with the numerical value of one of the digits transmitted to the recorder-transmitter during the dialing of a call number.



     In accordance with another characteristic of the invention, means are provided in each recorder-transmitter to keep the last digit of the call number of a received communication concerning sets of the same shared line until the calling subscriber hangs up, and to transmit an appropriate acoustic signal on the shared line in question,

   and these means are implemented by transmitting to the recorder-transmitter a determined prefix digit

  <Desc / Clms Page number 3>

 which identifies the character of the communication in question.



   Another characteristic of the invention is that the recorder-transmitter is provided with means controlled in accordance with the numerical value of one of the digits of a received call number comprising several digits, to indicate @ the number of digits that has this n.



   The invention will be better understood by the following description relating to a manner of taking advantage thereof, which is given by way of example, and should be considered in conjunction with the attached Figures 1 to 17, which , arranged side by side in numerical order, represent an automatic telephone network that has been converted from a semi-automatic network.



   The network has a central office, which terminates a certain number of subscriber lines; it may be connected by junctions to a number of smaller exchanges, some of which may be of the fully automatic type. The central office is. represented as ending. two subscriber lines 10 and II, the first of which is a shared line serving stations A and E, while the second is a regular line serving only station B.



  Each line terminates with a conventional line circuit; the line circuits corresponding to lines 10 and II being shown schematically at 10 a and II a, respectively.



  The central office is also provided with an interurban switching panel 30, through which incoming or outgoing long distance calls are routed. The central office is equipped with automatic switches which, as a rule, may include those previously used when the central was operated in a semi-automatic fashion.



  This equipment comprises a set of call searcher groups, one of which comprises group 15, shown in FIGS. 2,3., And 4; a set of groups of second selectors

  <Desc / Clms Page number 4>

 16 and 20, as well as a set of groups of connectors, one of which includes connector 17. Each group of call hunters is designed to serve a particular group of 100 subscriber lines, and is associated to common equipment, lines 10 and II being served by the group of call seekers which includes group 15, which is associated with common equipment 14.

   A set of groups of recorder-transmitters are provided for controlling the automatic switches, the different groups corresponding individually to the different groups of call hunters. Thus, the recorder-transmitter of figs 6 to 17 is part of the transmitter group associated with the group of call seekers comprising group 15. In order to associate a free recorder-transmitter with a group to which a call is made. arrived, each of the groups is associated with a recorder selector having access only to transmitter recorders of the associated transmitter group. Thus, the group 15 has an associated recorder selector 18, which has access to the transmitter recorders of the group comprising the recorder-transmitter 19.



   Caller group selectors, second selectors and connectors may all belong to equipment that was installed prior to the conversion of the semi-automatic network to a fully automatic network, and are assumed to be provided for. for the return control of recorder-transmitters or recorder markers initially provided in the exchange, in order to operate these switches.



   As a necessary addition to the conversion, it may be that the subscribers served by the central office must be able to communicate freely with those of another automatic exchange, in which the automatic switching equipment is provided to respond directly. to the

  <Desc / Clms Page number 5>

 numbered pulses. It can also be interesting.



   . by modernizing the equipment of a central office, to 'replace. some of the switches, after the first selection stage; by automatic switches designed to respond directly to dialing pulses. For the purpose of illustrating this possibility, the system is shown as comprising a 4-digit, pulse-direct connector 21 accessible to the selector part of group 15, and having. access to a line 12 terminating at station E. This connector may, for example, be of the all relay type disclosed in US Pat. No. 2317833, and may be located in a small remote exchange .

   In this case, it is preceded by an automatic scanning switch and the usual line repeaters, as indicated by the hatching inserted in line 24: For reasons which will appear.



  'clearly in the course of the description, this connector is designed to be able to absorb a first received digit of 9 pulses. In addition, to illustrate the two possibilities of use mentioned above, the second reverse pulse selector 20 is shown as having access to a train of 4-digit selectors 22 ', with direct pulses via line 26. This train of selectors is also designed to respond directly to dialing pulses, and may be located in a fully automatic exchange remote from the exchange in question, and may include an input selector having access to a 3-digit connector via the inter- from whom communication can be routed to line 13 serving post D.



   The central office call searcher groups are all the same; group 15 comprises an all-relay type call finder, a step-by-step type two-movement selector, and a group of control relays.,
 EMI5.1
 * '-.-' '
The call finder has 10 group relays, each of which individually corresponds to the lines forming a subgroup @

  <Desc / Clms Page number 6>

 of 10 lines, and ten unit relays, each of which corresponds individually to a particular line in each subgroup. The group and unit relays R 210 and R 220 have contacts through which the conductors of line 10 can be connected to the group control equipment.



  The group selector is of the type in which the trotters rotate (, 'first, controlled by a rotation electro, then are raised, controlled by an ascension electro. Recorder selectors individually corresponding to the groups of Call finders are of the rotary one-motion type, well known, and are all identical.



   The various transmitter recorders of the central have, associated in common with them, certain auxiliary equipment, which are of the usual type and have therefore only been shown schematically in the figures. auxiliary devices include three different "timers" of a common model, collectively referred to as the timing equipment ", shown at 31. They also include the signaling equipment.

   The latter comprises, in addition to the usual generators of the inrush current, the occupancy current and the dialing current, a special current source to produce a separate acoustic signal, which is used by the recorder-transmitter during establishing communications between stations on the same shared line.



   Assuming that a communication emanates from station A at a time when the group of call seekers 15 is designated by the distribution relays of the common equipment 14, the calling circuit established by way of the line IO causes the line relay operation of line circuit 10 a.



  This relay closes a circuit which energizes the starting relay of the equipment 14, as well as circuits which energize those of the tens and unit marking relays of this equipment which correspond to line 10. At the continued from.

  <Desc / Clms Page number 7>

 operation of these relays, the starting conductor 272 @ is grounded to energize the relay R 200 and a ground is applied to the units marking conductors and tens 269 and 270. The relay R 200 closes its contacts 206 and 207 to close circuits comprising respectively the grounded conductors 269 and 270, to energize the units and tens relays R 216 and R 210; it closes via its contacts 208 and 209 the circuits of the relays R 240, R 310 and R.



   350. The relays R 220 and 'R 210 extend the calling loop from the conductors of line 10, passing through contacts 211, 212, 221, 222 and 304 to impedance 335 and to relay R 330, the latter being thereby excited. The relays
R 210 and R 220 also prepare by 213 and 223 the earthing of the conductor 268; they prepare by 214 and 224 their holding circuits%.



   When operating, relay R 310 closes the holding circuit of relays R 210 and R 220; it opens in 312 a point of a circuit to mark the occupation of the group'15.



   The relay 350, while operating, opens a point of a circuit for the relay R 400, and opens at 352 a point in a circuit to earth the contactor 473 of the selector.



   The relay 240, while functioning, prepares in
241 the relay circuits, R 230, R 250 and R 330; it closes at 242 a circuit for relay R 320, in series with the line circuit cut-off relay 10 a; it opens in'243 a point of one of the actuation circuits of relay R 230; it prepares in 244 a circuit for the relay R 300, and prepares at contact 245 the earthing of the ° conductors 35 a and '
35 d.



   The relay R 320 operates when it is energized in series with the line circuit cut-off relay '10 a, and closes at 322 parallel holding circuits. For the relays R 210 and R 220; it prepares in 323 the channel for the marking of group 15 as occupied, and in 324 opens the circuit of relay R 200.

  <Desc / Clms Page number 8>

 



   When the relay R 330 is energized in the circuit of the calling loop, it interrupts at 332 the initial holding circuits of the relays R 210 and 220; it closes in 333 the holding circuits of the relays R 240 and R 350; it prepares in 331 the actuation circuit of the relays R 360 and R 410, and puts the conductors 35 a and 35 d to the ground, by the contacts 477 , 478, 321, 331, 403, 412, 245 and 255 for the conductor 35 d, and 257 and 302 for the conductor 35 a.



   When the cut-off relay of the line circuit 10a is energized, in response to the operation of the relay R 240 it releases the common equipment 14, thus making it available to receive another communication. By releasing this equipment, the starting conductor 272 as well as the tens unit marking conductors 269 and 270 are disconnected from the earth, to interrupt the actuation circuits of the relays R 200, R 220 and R 210. When it is de-energized, the R 200 relay releases the R 310 relay in 208, which then closes the circuit in 312 to mark the occupation of group 15, and interrupts it. once again the initial maintenance circuit of relays R 210 and R 220.



   When earth is connected to conductor 35d through group 15, relay 520 of logger selector 18 is pulled in and prepares at 521 its own hold circuit; it opens in 524 the circuit bypassing relay R 530 at rest, prepares in 523 a circuit for the R 530 relay and prepares or closes in 522 a circuit for the electro 560 of the selector to a movement 550. If the recorder - transmitter 19 is free, conductor 36 d of line 36 is interrupted; if it is occupied, conductor 36 d is earthed at 602.

   Thus, if the switch 550 engages a recorder-emitter occupied when the relay R'520 operates, the relay R 530 is short-circuited, the electro 560 is energized and operates, to advance the wipers 556 to 559 up to '' to contacts corresponding to another recorder-transmitter

  <Desc / Clms Page number 9>

 and de-energizes its own winding in 560 ... If the second recorder-transmitter is also occupied, the earth is maintained on the wiper 559, to prevent the excitation of the relay R 530 and cause a new operation of the electrical system. 560 after his release.

   On operating again, the electro 560 advances brushes 556 to 559 to reach a third recorder-transmitter, and so on. Assuming that the recorder-transmitter 19 is the first free recorder-transmitter tested by the selector 18, the relay R 530 is energized in series with the electro 560, according to a circuit comprising the contacts 523 and 560 a. The current flowing through this circuit is insufficient to cause the operation of the electro 560 again.

   The relay R 530 closes at 538 a holding circuit for itself, and prepares, at 537, a holding circuit for the relay R 510 '; interrupts again at 523 the control circuit of the electro, and earths at 536, the wiper 559, to mark the occupation of the recorder-transmitter 19; it connects in 531 and in 532 the conductors 35 b and 35 a, by the trotters 556 and 557, to the conductors 36 b and 36 a of the line 36 towards the recorder-transmitter 19, thus actuating the relay R 700; it finally prepares in 534 the circuit for actuating the relay R 510 and a holding circuit for the relay R 520.



   When the recorder-transmitter 19 is seized, as has just been explained, some of the relays which it comprises operate to enable it to control the operation of the selector part of group 15 and of the switches. following automatic ones, to extend the call to the desired extension. Following the intervention of this recorder-transmitter, the relay R 600 operates, to close the circuit prepared for the relay R 510, this circuit being: the earth, the 200 ohm resistance 635, the contacts 607 and 627, the 36 c conductor, the 558 wiper, the contacts

  <Desc / Clms Page number 10>

 534 and 511, the winding of relay R 510 and the battery.



  Being thus energized, the relay R 510 first opens its contact "z Il 515, to interrupt the circuit putting the conductor 35 c directly to earth in the selector 18, then closes its contact 514, to close the circuit. holding already prepared for itself Relay R 510 also interrupts its actuating circuit at 511, indicated above, closes at 512 a holding circuit for relay R 520 and finally opens on its contact. y "513 the actuation circuit of relay R 520.



   Relay R 510 also closes the circuit of relay R 300 at 512, depending on; earth, resistor 635, contacts 607 and 627, conductor 36 c, trotter 558, contacts 534 and 512, conductor 35 c, contacts 244 and 24, the winding of relay R 300, the battery. One branch of this circuit extends through resistor 264 and contact 236, to energize relay R 230, but due to the limiting action of resistor 264, the current is not sufficient to operate. attract relay R 230.

   Relay R 300 closes its holding circuit at 307; it closes in 303 a holding circuit for relay R 330, depending on: earth, contact 241, resistor 308, contact 303, the winding of relay R 330 and the battery; it disconnects at 304 the relay R 330 from the negative wire of line 10, and closes at 301 a circuit according to which the pulses can be transmitted from the
 EMI10.1
 calling station A to relay lt 700 of the receiver 19 seized.

   This circuit includes: earth, impedance coil 335, the positive loop wire extending to station A, the bridge between the line conductors at station A, the negative loop wire, the contact 301, the conductor 35 a, the contact 532, the wiper 557, the conductor 36 a, the contact 621, the winding of the relay R 700 and the battery.



  'After this circuit is established and maintains relay R 700

  <Desc / Clms Page number 11>

 the actuation circuit, relay is interrupted in
302. The R 300 relay also closes the circuit of the R 360 and R 410 relays at 306, depending on: earth, contacts 477, 478, 321, 331, 403, winding of relays R 410 and R 360, contact 306, the battery; it closes at 305 a circuit for relay R 250 comprising resistor 309 and contacts @
309 and 252.



   While operating, the relay R 250 maintains itself to the earth by its preliminary closing contact 251, and then opens its contact 252 to interrupt its excitation circuit. Relay R 250 also shunts impedance 335 in 253 via resistor 309, to reduce the resistance of the loop which supplies relay R 700; it opens the excitation circuit of relay R 300 in 254; it disconnects conductor 35 d from the earth at 255, thus opening the initial circuit of relay R 250 at a new point; opens at a new point, at 257, the initial circuit of relay R 700, and closes at 256 a circuit to light the permanent signaling lamp 265 by earth, contacts 477, 478, 321, 331, 403, 413, 245 , 256, the 265 lamp and the battery.



   While operating, the relay R 410 connects in 411 the negative friction contact 471 to the earth, by the contacts 422 and 232; it prepares at 413 an inverse pulse circuit which is used to empty the recorder-transmitter 19 of the digits which are recorded therein, in the event of an unsuccessful exploration of the lines by the selector,. and opens at 412, at an additional point, the met- circuit. both to ground the conductors' 35 a'and 35 d, while interrupting the supply of the lamp 265.

   Relay R 360, ¯ in operation, prepares in 362 a circuit according to which relay R 460 can be controlled by recorder-transmitter 19 and the pulse-transmitting relays of recorder-transmitter 'can be controlled by return via relay R 450; he. opens in 361, at a point, the conversation circuit

  <Desc / Clms Page number 12>

 to prevent the impulses transmitted between the recorder-transmitter and the group, during the establishment of the communication, from being reproduced in the form of clicks in the receiver of the calling station, it also energizes the relay R 340 at 363. This relay , while operating, is held to earth by contacts 341, 321, 477 and 478; it opens at 342 the excitation circuit of relay R 400, and closes at 341 and 343 a holding circuit for relays R 410 and R 360.

   Following the intervention of the recorder-transmitter 19 and the resulting operation of the relays R 300, R 250 R 360, R 340 and R 410 in the manner just explained, the equipment is placed in a position such that the pulses can be transmitted from the calling station A to the recorder-transmitter 19 for the purpose of transmitting the required information to the recorder-transmitter. A pulse output circuit is also established between the group and recorder-transmitter 19, whereby the selector can be controlled directly, in accordance with the first digit transmitted to the recorder-transmitter.

   It is obvious that when the relay R 300 is attracted, the calling device, at the calling station A, can be actuated to transmit pulses to the relay R 700 of the transmitter 19 by a circuit comprising the two wires of the transmitter. line 10 and conductors 35a and 36a. The way in which the recorder-transmitter responds to the pulses received is explained in detail in the following. It should be noted however, at this point, that shortly after one or two digits are transmitted to the recorder-transmitter by the calling station, the recorder-transmitter operates, to energize the relay R 460, and therefore makes the selector start to work.



   The pulse mode used between the recorder-transmitter 19, the selector part of group 15 and those of the switches which succeed group 15 for routing

  <Desc / Clms Page number 13>

 communication to its destination, is determined by the numerical value of the first or second digit transmitted to the recorder-transmitter depending on the destination of the communication, a recorder-transmitter may be required to transmit a string of digits, some of which are used to control the operation of automatic switches intended for direct control, and others are used to control automatic switches intended for reverse, or return control, recorders-transmitters. The selector part of group 15 is arranged for the latter type of control.

   Relay R 460 is energized in series with relay R 1760 of recorder-transmitter 19, during the closed-circuit period of each pulse of the first digit, and closes a circuit for relay R 440 at 461; it energizes at 461 and 462 the rotational electro 474. When so energized, relay R 440 opens at 441 a point of relay circuit R 430.



   The electro 474, while working, turns the wipers 470 to 473 by one step, and energizes the relay R 450 in 474. The latter, while operating, de-energizes the relays R 460 and R 1760 at 451; it opens a point, at 452, of the holding circuit of relay R 430, and a point of the earthing circuit of the wiper 472, and opens at 453 a point of the circuit of the electro-ascension 475. When ' it is de-energized in the manner described, the relay R 1760 drops out, to make the pulse counting relays of the recorder-transmitter 19 progress by one, thanks to which the transmitted pulse is counted, as described in detail in the following.



  Relay R 460, when falling, interrupts the circuit of relay R 440 in 461; it de-energizes the rotation electro 474 in 462, which releases relay R 450 at 474. This last relay, when falling, is prepared again in 451 the circuit of relays R 460 and R 1760 in series. During each of the successive pulses transmitted to the selector by the recorder-transmitter

  <Desc / Clms Page number 14>

   19, the relays R 460 and R 450 collaborate with the rotation electro 474 as described above. Each time a current pulse is transmitted to the electro 474, the wipers 470 to 473 progress a new step, and each time the relay R 460 operates, a pulse is transmitted to the relay R 440 Due to its tripping delay, this last relay remains attracted during dialing.

   At the end of the first digit, the wipers 470 to 473 occupy a position opposite to the vertical row of contacts corresponding to the numerical value of the digit. Following the first step of these wipers, the rest position contacts 480 and 481 are brought together, to prepare the circuit for the relay R 430, and multiple holding circuits for the relays R 210 and R 220.



   At the end of the first digit, relay R 460 remains attracted and cause the release of relay R% 4D. Therefore, this relay closes at 441 the circuit of relay R 430, according to: earth, 480, 481, 402, 441, the ascent rest position contacts 479, the winding of H 430 and the battery.



  When so energized, relay R 430 holds to earth, according to 431 and 452; it energizes the R 420 relay at 432, and closes the ascension electro circuit 475 at 433. The R 420 relay disconnects the wiper 471 from the earth at 422; it disconnects at 421 the wiper 470 from the conductor 35a, and at 423 opens a point of the circuit of the relay R 400, and at 424 prepares the circuit of the release relay 476.



   The electro 475, on falling, makes the wipers 470 to 473 progress by one step in the vertical direction and energizes the relay R 450 in 475. This relay de-energizes the electro 475 in 453, and opens a point of the circuit in 452. holding circuit of relay R 430. Following the vertical movement of wipers 470 to 473, contacts 477 and 478 are actuated, to interrupt the circuit of relay R 460 and open

  <Desc / Clms Page number 15>

 the multiplied holding circuits of relays R 340, R 410 and R 360. Contacts 479 are also moved apart to open the initial circuit of relay R 430.



   The subsequent operation of the trotters 470 to 473 in the vertical direction depends on the free or occupied state of the selected line following the first upward step of these sliders. If this line is busy, the test conductor is marked to earth, and provides a holding circuit, according to the wiper 472, to keep the relay R 430 energized. If the line is free, the test conductor is not marked to earth, so the R 430 relay drops out when the 479 and 452 contacts are open. Assuming that the first line of the group selected is occupied, the relay R 430 is kept attracted and the electro 475, by falling back in response to the operation of the relay R 450 de-energizes this relay at 475 a.

   On falling, relay R 450 completes again, at 452, the holding circuit of relay R 430, and again energizes, at 453, electro 475.



  When running again, the electro 475 raises the selector trotters a second notch; therefore, the contacts terminating the conductors of the second line of the selected group are connected to these wipers, and again energize, at 475 a, the R 450 relay. The R 450 relay and the 475 electro continue to cooperate. , until a row is found in the selected group. When this is obtained, the wiper 472 is disconnected from the earth, and the relay R 430 drops out. Subsequently, the relay R 450 drops and puts the wiper 472 to earth, at 452, so that the selected line is marked as occupied.

   On falling, the relay R 430 interrupts again, at 431, its own circuit, and opens at 433 the excitation circuit of the electro 475, to prevent further operation of this electre, and de-energizes at 432 the relay R 420. On falling, relay R 420 connects the negative line contactor 471 at 422 to earth. When the earth is connected to the wipers 472

  <Desc / Clms Page number 16>

 and 471, the switch terminating the far end of the selected line is grasped in the well-known manner and made to receive the pulses of the second digit, recorded by the recorder-transmitter 19.

   The relay R 420 also prepares, at its contact 421, a circuit for transmitting the pulses, of the second digit, if it exists, to the automatic switch concerned via the chosen line; it prepares again, in 423, the operating circuit of relay R 400 and opens the circuit of electro 476 in 424. No further relay operation takes place in the selector until all the digits recorded by the recorder-transmitter 19 have been transmitted.



   When the recorder-transmitter has got rid of all the digits transmitted to it by calling station A, it is released in the manner explained in detail in the following. By releasing this transmitter, conductors 35 a and 36 c are disconnected from earth, thus de-energizing relay R 300 of group 15 and relay R 520 of recorder selector 18. Relay R 300 interrupts. in 307 its own holding circuit, opens in 306 the circuit of relays R 360 and R 410, inserts again, in 304, the relay R 330 in the loop extending to the calling station A, opens in 303 the circuit holding relay R 330, opens the circuit bypassing the impedance 335 in 305, and disconnects the conductor 35 a at 301 from the negative wire of the calling line 10.



   Relay R 410, when it drops, interrupts at 411 the circuit earthing the wiper 4? 1; it prepares at 412 the circuit for grounding conductors 35 a and 35 d, and opens at 413 the reverse pulse circuit described previously. Relay R 360, on falling, de-energizes relay R 340 in 363, extends the conversation circuit in 361 through group 15 to the line arriving at the next activated selector of the selector train, and opens in 362 a

  <Desc / Clms Page number 17>

 new point of relay R 460 circuit.



   Relay 'R 340, on falling, also interrupts, at 341 and 343 its own holding circuit as well as that of relay R 360 and R. 410; it prepares again, in 342 the circuit of relay R 400. After the operation of relays R 300, R 340, R 360 and R 410, no further operation of the equipment of group 15 takes place, until that the call is released at its called end. It should be noted that the conversation battery is supplied to calling station A through impedance 335 and relay R 330.



   When the relay R 520 is de-energized, following the release of the recorder-transmitter 19, it again interrupts its own holding circuit at 521, disconnecting conductor 36 d from earth at 522, thus making the recorder - recorder-transmitter 19 accessible to the other selectors recorded @ rs, opens in 523 the excitation circuit of relay R 530, and short-circuits relay R 530 and excites electro 560 in 524. Therefore, l The electro 560 advances the wipers 556 to 559 by one step, so that they engage the contacts corresponding to another recorder-transmitter. The relay R 530 drops out, when it is thus short-circuited, and interrupts its holding circuit at 538, as described above; it opens in 537 the holding circuit of relay R 510.

   After releasing the relay R 510, the recorder selector 18 has completely returned to idle. It should be noted that after the group 15 has been activated to allow the passage of the communication, the conductor 35 dy is disconnected from the earth, to prevent the relay R 520 of the recorder selector 18 from being able to operate again. .



   If all the lines of the group selected during the rotational movement of the wipers 470 to 473 are occupied when the exploration begins, the movement of these wipers continues up to the eleventh vertical position, in

  <Desc / Clms Page number 18>

 which the wiper 472 is disconnected from the earth, since the test contact of this position is not connected. Thus the relay R 430 is de-energized, de-energizes at 432 the relay R 420 and opens at 433 the circuit of the electro-ascension 475.



   The relay R 420, on falling, closes at 421 the reverse pulse circuit via the trotter 470, the contact 413 and the conductor 414, which extends to a group of relays arranged to cooperate with the relay R 1760 of the same way as the electro 474 and the relay R 450. Thus each time the relay R 1760 is connected to the conductor 414, one of the reverse pulse relays, not shown, is energized according to the reverse pulse conductor, and causes, while operating, the disconnection of this conductor from the earth, to cause the de-energization of relay R 1760. This device is used to eliminate from the recorder-transmitter all the digits stored there, after which it is released automatically.



   Following the release of the recorder-transmitter 19, the conductor 36c is disconnected from the earth, to produce the release of the recorder selector 18 and of the relays R 100, R 340, R 360 and R 410. In in this case, the relay R 300, when it drops, closes a contact which returns an occupancy signal in a circuit comprising the generator of the occupancy signal, earthed, in the common equipment 32, the conductor C 971, baby walker 471, contact 422, capacitor 344, contacts 304, 222, 212, negative caller loop wire, receiver at station A, positive loop wire, contacts 211 and 221, impedance 335 and earth.



  When this signal is received by the calling station, the connection can be released, as explained later.



   Several different destinations have been indicated in fig. 1 for communication extended to group 15, with the aim of explaining the facilities granted by the recorder-transmitter 19 for automatically controlling the type

  <Desc / Clms Page number 19>

 pulse used to direct the communication to its destination, according to the numerical value of the first or second digit of the registered call number, while at the same time using these digits in the control of the switches, as well as to inform the recorder-transmitter of the number of digits that follow.



   For example, if it is a long distance call requiring the intervention, to establish it from an operator, the digit "0" is sent to the recorder-transmitter 19, and this indicates to it that a single digit should be received and retransmitted. This transmitter, by repeating the number to the selector part of group 15, makes it choose a free line, for example, line 25, leading to panel 30 of the operator of the inter. Recorder-transmitter 19 is released, and group 15 is actuated to connect the conversation circuit to the conductors of line 25, immediately after the selector part of the group operates to seize a free line among those of the trunk panel. 30.

   From this panel, communication can be extended to the desired exchange and extension, in the manner usually followed for the transmission of long distance calls.



   If the call routed to group 15 from station A is intended for another station, for example B, served by the same exchange, the call number of the desired station will necessarily contain five digits. In this case, the first digit transmitted by the calling station to the recorder-transmitter may contain from I to 4 pulses, which indicate to the recorder-transmitter that five digits must be received, and that, during the transmission of the five digits by the recorder-transmitter the pulse transmitting relays will be controlled in return by the automatic switches through which the communication is routed.

   The first digit transmitted to the recorder-transmitter 19 is used to

  <Desc / Clms Page number 20>

 have a line seized by the selector part of group 15, for example line 22, leading to a second selector with reverse pulses. The second digit is used to make the second selector concerned (for example, selector 16) enter a local free connector to which it has access.



  The remaining three digits are used to make the relevant connector (for example, connector 17) select the desired line II, and to select the particular code or frequency to be used to call station B. After these operations are completed , the usual line test is performed by connector 17, to determine whether the called line II is free or busy; the called set is called if the line is free; the usual busy signal is sent to the calling station if the line is busy. The desired conversation circuit between the calling station and the called station is established by connector 17, when called station B answers the call.



   In the case which has just been considered, the recorder-transmitter 19 is controlled in return by the selecting part of the group 15, the second selector 16 and the connector 17, in its operation consisting in transmitting each of the five digits needed to route the call to the desired extension. It may be, however, that the communication routed to group 15 is intended for a station served by a remote exchange, which uses automatic switches which are not equipped for the return control of the recorder-transmitter 19. , during the emission of the pulses.

   For example, the first two digits transmitted to recorder-transmitter 19 may comprise 8 and 9 pulses respectively, indicating that the group of trunk lines comprising line 24 will be selected during the primary movement of the selector of group 15. As mentioned previously, the trunk lines including line 24 can go to a central office in which

  <Desc / Clms Page number 21>

 4-digit connectors are the only direct operated switches used to provide access to lines terminating in them. In addition, these connectors are of the direct impulse type, not being equipped for the return control of recorders-transmitters installed in the exchange from which the communication originates.

   In this case, and as will be explained in more detail below, the first digit "8 as numbered in recorder-transmitter 19 indicates that the group of lines comprising line 24 will be selected by the selector. of group 15. The second digit "9" indicates that the transmitter-recorder-transmitter equipment should not expect a return command to empty the recorder-transmitter, during the transmission of the 2nd, 3rd.



    4th and 5th digits. The second digit transmitted to the recorder-transmitter by the calling station also indicates to it that it will receive five digits during dialing.



  It is obvious that the communication can, in this case, be transmitted by line 24 and by the four-digit connector 21, for example, to the called station, for example station C, served by the remote exchange.



   A communication can also be transmitted from group 15 through line 23 and through the second selector 20 either to one or the other of the special lines 27, 28 or 29, or via the train of selectors. 4 digits 22 'from a second remote exchange to line 13 of set D, for example. Line 23 ends in the bank of contacts of the selector part of group 15, in the sixth vertical row of contacts, and thus the first digit numbered in the recorder-transmitter 19 by the calling station will necessarily have six pulses, In this Also in this case, the second digit transmitted to recorder-transmitter 19 is used to inform the transmitter of the type of pulse that will be used to extend the link beyond group 15.

   Through

  <Desc / Clms Page number 22>

 therefore, if a second digit "2", "3" or "8" is numbered in recorder-transmitter 19, the transmitter is informed that it will be commanded in return while transmitting its pulses. . These three digits, when preceded by the digit "6", also indicate that one of the three groups of special lines will be entered by the second selector 20, and that there will be only three digits which will be numbered in the recorder-transmitter by the calling station.

   On the other hand, if a second digit "4 is numbered in recorder 19 after the digit" 6 this indicates that the communication is going to be transmitted via the train of switches 22 'at four. figures; the recorder-transmitter 19 is informed that all digits following the second will be transmitted to automatic switching equipment which does not have the facility of back-controlling the pulse-emitting relays and the recorder - sender is informed that six digits should be received while dialing the call number.



   The release of the connection extending from set A through group 15 to trunk panel 30, or to sets B, C or D, or even to a special operator position terminating one of the three special lines 27, 28 or 29, is controlled by the calling subscriber at set A. When the calling subscriber hangs up the calling loop is open to release the relay R 330. This relay, when falling, will release the relays R 240 and R in 333. 350. Relay R 240, on falling, de-energizes relay R 250 at 241, and opens at 242 the circuit according to which relay R 320 is energized, in series with the cut-off relay of line circuit 10 a; these two relays falling as a result.

   Relay R 350, when falling, supplies the relay R 400 with 352 from the earthed wiper 473, via contacts 473, 423 and 352, the winding of relay R 400 and the battery, given that when one of

  <Desc / Clms Page number 23>

 following selectors is seized by the selector of group 15, ,,, an earth is returned on the earth conductor of the line leading to the seized selector. Relay R 520, on falling, de-energizes at 322 the relays R 210 and R 220; it again prepares at 324 the actuation circuit of relay R 200 and opens at 323 the circuit according to which group 15 is marked occupied, thus making this group available for subsequent communication.



   The R 400 relay, while working, stays earthed, by contacts 401, 481 and 480, it opens in 403 at one point the circuit of the R 410 and R 360 relay, and opens at 405, at a new point, the holding circuits of relays R 210 and R 220, and opens at one point, at 402, the actuating circuit of relay R 430, while energizing relay R 420 at 404.



   The R 420 relay, when operating, closes the circuit of the electro 476, i.e.: earth, contacts 480, 481, 401,
352, 424, the winding of the electro 476 and the battery. When it is thus excited, the electro 476 attracts its retaining pawl, allowing the wipers 470 to 473 to return to their rest position in the usual way. By releasing these rubbers, the contact blades 477, 478 and
479 are brought into contact, and the blades 480 and 481 are released, to de-energize the relays R 400 and R 420 as well as the electro 476. Also due to the release, the earth is disconnected from the tet conductor of the line leading to the next selector of the train through which the link is transmitted, thus initiating the release of that part of the train.



   After releasing relay R 400, group 15 is completely brought to rest, and can be used later by the relays of the common equipment 14.



   The way in which the selector train which follows group 15 shown is quite normal, and will be immediately understood by technicians familiar with the art.

  <Desc / Clms Page number 24>

 It is obvious that when the relay R 240 drops out, as explained previously, to de-energize the line circuit cut-off relay 10 a, this cut-off relay drops out, to release the line circuit, and the protective earth potential is withdrawn. private driver 268 of line 10.



   If all the recorders-transmitters accessible to recorder selector 18 are occupied, relay R 500 is de-energized. An excitation circuit for this relay is normally closed in recorder-transmitter 19 by contacts 603 and 622, this circuit being open when recorder-transmitter intervenes, and similar parallel circuits terminate at each of them. other recorders-transmitters of the group.

   On falling, the relay R 500 closes in 501 a circuit for the relay R 540, which in turn closes in 541 a circuit putting the conductor 35 c of line 35 directly to earth, at 515; in 542, 549, etc ... it closes analogous earth marking circuits for the control conductors of the lines leading to each of the other recorder selectors having access to the recorder-transmitters of the group in which the occupant of all the organs is common. The application of a direct earth to the conductor 35 c activates the relay R 230, which closes in 234 a circuit for the relay R 320, by the resistor 263.

   Therefore, relay R 320 closes the circuit to mark the occupation of group 15 to the distribution relays of the common equipment 14; relay R 320 opens at one point, in 324, the circuit of relay R 200, and closes at 321 a new circuit for relay R 400, the operation of which has no effect. As long as relay R 320 remains attracted, group 15 cannot be designated for use by them. common equipment distribution relay.



   When one of the recorder-transmitters of the group is released, the circuit of relay R 500 is closed again and this relay, when operating, successively causes the release.

  <Desc / Clms Page number 25>

 tion of relays R 540, R 230, R 320 and R 400. Relay R 320, by falling, interrupts at 323 the circuit indicating the occupation of group 15, so that this is made available in view for further use.



   If all the recorders-transmitters 19 accessible to the selector 19 become occupied after the intervention of group 15, and while the selector 18 is looking for a free recorder-transmitter, the relays R 240, R 350, R 210, R 220, R 320 and R 330 are actuated in group 15, and relay R 520 is actuated in record selector 18.

   When relay R 500 drops out, to indicate total occupation, relay R 540 closes at 541 a holding circuit for relay R 520, and a new circuit for relays R 300 and R 320, in parallel, by earth, contacts 515 and 541, conductor 35 c, contacts 244 and 254, the coil of relay R 300 and the battery, as well as by resistor 264, contact 236, the coil of relay R 230 and the battery. Since direct earth is applied to conductor 35c, relays R 270 and R 300 both operate.



   The relay R 300, while functioning, maintains at the conductor 35 c, and causes the operation of the relays R 250, R 360, R 410 and R 340, as explained above, and establishes in 303 a holding circuit for the relay R 330.



  While operating, the R 230 relay remains earthed by its preliminary closing contact 231; it opens in 236 its initial circuit; it closes at 234 and 235 a circuit crossing resistor 263 to keep relay R 320 energized, and disconnects conductor 268 from the earth to put line circuit 10 a in its refusal position; it opens in 232 the circuit putting the trotter 471 to the ground;

   he prepares in 233 a circuit to put the battery voltage on this trotter, and opens in 237 the holding circuit

  <Desc / Clms Page number 26>

 of relay R 220. This last relay, on falling, disconnects at 221, 222 and 223 the conversation conductors of the calling line from the conversation conductors of group 15, and opens at another point the initial circuit of relay R 320, in series with the 10 a line circuit cut-off relay; it opens at 224, at another point, its own holding circuit.

   After the operation of relays R 230, R 250, R 300, R 340, R 360 and R 410 and release of relay R 220, no further operation of the relay takes place in group 15, until the total occupation of the recorders-transmitters accessible to the selector 18 has ended.

   It should be noted that, when the relay R 320 is attracted and the relay R 310 released, a circuit is closed by 323 and 312 to mark the occupation of group 15 to the distribution relays of the common equipment 14, thus preventing this group to be designated to be used for another calling line * It should also be noted that when the relays R 250 and R 410 are pulled, the initial circuit of the relay R 520 of the register selector is kept open at 255 and 412.



   When the total occupation of the transmitting recorders is terminated, relays R 500 and R 540 drop in the order indicated. The last relay, when falling, disconnects conductor 35 c at 241 from earth, and thus releases relay R 300 of group 15 and relay R 520 of selector 18. When relay 520 drops, selector recorder 18 is released in a manner clearly apparent from the foregoing explanation. On falling, relay R 300 de-energizes relays R 360 and R 410 at 306, and opens at 303 the only circuit available for relay R 330, "so that relays R 330, R 360 and R 410 drop.

   Relay R 360 when falling, interrupts the circuit of relay R 340 at 363, while relay R 410, when falling, closes the circuit of lamp 265 at 412.

  <Desc / Clms Page number 27>

 



   Relay R 330, on falling, de-energizes at 333 the R 240 and R 350 again, and opens the circuit of lamp 265 at 331, at a multiplied point. Relay R 350, when falling, prepares in 351 a circuit for relay R 400. Relay R 240, when falling, de-energizes relays R 230 and R 250 in 241 and extinguishes lamp 265 in 245. The R 230 and R 250 relays then drop, and the first de-energizes relay R 320 in 234. This de-energizes relay R 340 at 321, opens the holding circuit of relay R 210 at 322, and opens the circuit in 323 for mark the occupation of group 15 at the distribution relays of the common equipment 14. After releasing relays R 340 and R 210, group 15 is completely released and can be designated for use by another calling line.



   If, in the case described above, the communication emanating from station A and extended to group 15 is intended for another station served by line 10, the link can be retransmitted from group 15 to line 10, via the second selector and connector 17, in a manner clearly apparent from the preceding description. In order to obtain the appropriate signaling, the calling subscriber hangs up to open the looped circuit leading through line 10 to the recorder-transmitter 19. At this moment, the relay R 300 is actuated, so that the Looped circuit is extended through the recorder selector 18 to the recorder-transmitter, to include the winding of the relay R 700.

   As a result, the R 700 relay is de-energized, to initiate some relay operations, which result from the application of a direct earth to the 36 c and 35 e conductors, whereby the increased excitation of the R 230 relay. resulting in operation of this relay.

   While operating, the relay R 230 is maintained to the ground by 231 and '241; it opens its excitation circuit in 236; it closes at, 234 and 235 a holding circuit for relay R 320

  <Desc / Clms Page number 28>

 and disconnects conductor 268 from ground 'in group 15; it opens in 237 the holding circuit of relay R 220, and closes in 233 a circuit via resistor 263 and contacts 411 and 422 to put a negative battery voltage on the wiper 471.

   Relay R 220, on falling, disconnects at 221 and 222 the conversation conductors of line 10 from the conversation conductors of group 15, and again interrupts at 223, the excitation circuit of the cut-off relay of line circuit 10 a in series with relay R 320. After these operations, connector 17 is conditioned to transmit the inrush current on line 10, in order to supply the bell of the station called E. call period, and for a brief moment after the call is answered, the recorder-transmitter 19 is kept attracted, being released at the command of a timing device specific to communications between stations. 'the same shared line, incorporated in the timing equipment.

   Following the release, the conductors 36 c and 35 c are disconnected from the earth in the transmitter, to de-energize the relay R 300, to initiate the release of the recorder selector 18.



  When relay R 300 drops out, it announces the release of group 15, as described previously. The recorder selector 18 is also released in the manner previously explained, when the conductors 35c and 36c are disconnected from ground in the recorder-transmitter 19. After a communication is established between the two stations A and Et line circuit 10a occupies a position such that it is guarded against incoming communications destined for line 10, and the talk current is supplied through the windings of the built-in line relay of the usual way in the line circuit. The line circuit is returned to idle when the link is released from the station

  <Desc / Clms Page number 29>

 calling as well as the called extension.



  It will be deduced from the preceding explanation that the group 15 can be seized by a line being in a permanent state of call, due to a fault or the negligence of a subscriber. Due to the intervention of group 15, the corresponding recorder selector 18 operates to reach a free recorder-transmitter, such as 19. Under the conditions indicated, no dialing pulse will be transmitted to the recorder-transmitter 19, and therefore the transmitter is forced to release, under the control of the timing equipment 31. Following the release of the recorder-transmitter, the conductors 36 c and 35 c are disconnected from the earth, to de-energize relay R 520 of recorder selector 18, and relay R 300 of group 15.

   When the relay R 520 drops out, it initiates the release of the recorder selector 18, in the manner previously described. The relay R 300, when falling, again inserts the relay at 304
R 330 in the looped circuit, interrupts the holding circuit of relay R 330 at 303, disconnects conductor 35 a at 301 and 302 from the negative wire of the calling looped circuit and prepares the circuit again to put a ground on this conductor , and de-energizes relays R 360 and R 410 in 306. Relay R
410, on falling, closes in 412 the circuit of the lamp 265, while the relay R 360 interrupts in 363 the circuit of the relay R 340.

   After releasing relays R 300, R 360 and
R 410, no further operation of the group 15 relays takes place, until the permanent demand state is cleared. The lighting of the lamp 265 serves to inform the supervisory staff of the exchange that the group 15 is blocked by a line in the state of permanent call. When this state is eliminated, the looped circuit passing through relay R 320 is opened, and this relay drops out, to initiate the release of group 15, in a manner which will become clear from the preceding explanation.

  <Desc / Clms Page number 30>

 



   Considering now the operation of recorder-transmitter 19, when it is entered by recorder selector 18, the looped circuit is connected thereto, and relay R 700 is energized; therefore, it closes in 702 a circuit for the relay R 710, and opens at one point, in 701, the pulse circuit.



   The relay R 710, while functioning, prepares more and more? It the circuit of the relay R 740, it closes in 712 a circuit for the relay R 600; it opens at one point, at 713 a circuit for relay R 620, and opens at one point, at 714, the circuits by which earth can be put on the 6th and 9th contacts of the contact group 953
The R 600 relay while operating, disconnects in 602 a multiplied earth connected to the conductor 36 d; it opens in 603 the circuit of the recorder-transmitter 19 for the R 500 relay, it prepares in 604 a circuit for the R 620 relay; it closes at 607 a circuit to ground the conductor 36 c, as explained previously; it puts the conductor 665 to the ground, in 608;

   it grounds the conductor 660 at 609 to cause the operation of the timing equipment 31 and the generators 32; it puts the conductor 666 to the ground in 601 and prepares in 605 a holding circuit for the relay R 620 and closes a circuit for the electro 1107 of the digit counting switch 1100, according to the earth, 605, 625, C 661 , 753, 808, C 877, the winding of the electro 1107 and the battery.



   When it is thus excited, the electro 1107 advances the wipers 1105 and 1106 in one step and closes in 1107 a circuit to excite the lower winding of the relay R 800, depending on the earth, 605, 625, C 661 , 1107 a, C 871, the lower winding of the R 800 relay and the battery. A branch of this circuit is extended by resistor 749 and the winding of relay R 750 towards the battery, but the

  <Desc / Clms Page number 31>

 The current flowing through it is insufficient to operate the R 750 relay.

   When the wiper 1106 reaches its first contact, a circuit is formed for the relay R 820, by the earth, the generator of the numbering current, the conductor 0 1081, the wiper 1106, 0 875, the upper winding of R 820 and the battery, while the wiper 1105 prepares the circuits of the pulse storage relays of group n I, illustrated in fig. 13.

   Following the movement of the trotters 1105 and 1106, the contacts 1109 are brought closer to prepare a circuit for the relay R 620. the relay R 800, while operating, prepares the circuit for the relay R 610 in 801, it prepares in 803 the circuit of relay R 720; it prepares in 804 the circuit of relay R 810 it also prepares in 802 the circuit of the numbering current; it opens in 805 the circuit normally short-circuiting its upper winding, thereby making its release quick: it opens in 806 the circuit of the lower winding of relay R 820; in 807 it closes its own maintenance circuit, and in 808 it interrupts its actuation circuit as well as that of the electro 1107 which drops off as a result.



   The relay R 820, when operating, opens at 821 a point in the circuit for transmitting the inrush current and the busy signaling current; it opens at 823 a point of the circuit of relay R 830; it short-circuits in 824 the contacts of the alarm key 705, it closes in 825 another point of the circuit of the relay R 750, and prepares in 826 a holding circuit for itself; it prepares in 827 a circuit for transmitting the current pulses to the pulse storing relays shown in FIGS. 13, 14 and 15; it opens at 828 a point of a circuit for the relay R 600, and opens at 829 a point of the circuit putting the conductor 36 c directly to earth.



   Relay R 820 also closes the circuit at 822

  <Desc / Clms Page number 32>

 of the dial current, which runs from the ungrounded conductor of the dial current generator, through conductor 0 1081, trotter 1106, C 875, 802, 822, capacitor 747, 621, conductor 36 a , the wiper 557, 532, the conductor 35 has, 301, the negative wire of the calling loop. From there it passes through the receiver of the calling station, and back to the ground terminal of the dial current generator according to the positive wire of the calling loop.



  The resulting signal indicates to the calling subscriber that he can begin dialing.



   During numbering, relay R 700 operates to control the two pulse relays R 730 and R 740, which repeat the pulses received at the pulse storage relays of figs 13, 14 and 15. The registration relay group n I, shown in fig. 13, registers the first, fourth and seventh digits; group 2, shown in fig 14, records the third, sixth and ninth digits.



   When relay R 700 restarts, during the open-circuit period of the first pulse, it interrupts the circuit of relay R 740 at 702, and closes the relay circuit with earth at 701, 701.? Il, 734, the winding of R 740 and the battery. While operating, the relay R 740 maintains itself to the earth by 742, according to 734 and? Il; it closes in 743 a circuit for the relay R 730, and closes in 744 a maintenance circuit for the relay R 710; it opens in 745 the circuit normally short- circuiting the capacitor 748, and closes a circuit in 746 to charge capacitor 748, in series with the upper coil of the first relay R 1300 in group n 1 of recording relays.

   This load circuit comprises the earth, 666, 1341, 1331, 1321, 1311, I30I, the upper winding of R 1300, the conductor SP I, the wiper 1105 and its first coutact, C 876, 827, 736, 746, the capacitor

  <Desc / Clms Page number 33>

 748 and the battery. The intensity of the load current flowing through this circuit is such that the relay R 1300 closes its preliminary closing contact 1303, to close a holding circuit for itself by the earth on the conductor 666, 1612 1315, 1303, the lower winding of R 1300 and the battery.



  When it is thus fully energized, relay R 1300 interrupts in 1301 the load circuit, initially established through its upper winding, and inserts in 1302 the upper winding of the second storage relay R 1310 in this. circuit. During the time that the contact 1302 is closed, however, the capacitor 748 is fully charged, so that the current in the upper winding of the relay R 13010 is negligible, and therefore this relay cannot operate at this time. The R 1300 relay also interrupts the holding circuit of the R 1340 relay in 1305 at one point, and earths the SH I conductor in 1304, thus preparing the circuit of the R 610 relay and of the electro 957 of the counting switch. number of digits 950.



   The remais R 740, also, closes in 741 the circuit of the relay R 750 by ground, 605, 625, C 661, 1107 b, C 762, 741, 825, the winding of R 750 and the battery. A parallel circuit through resistor 749 is also closed for the lower winding of relay R 800, but resistor 749 is such that relay R 800 is not prevented from releasing when its main holding circuit is interrupted. The R 750 relay, while operating; opens a point in 751 of the circuit of the electro 957 of the counting relay 850; it opens at 752 a point of a holding circuit of relay R 630, and interrupts the holding circuit of relay R 800 at 753.



  The relay R 800 then drops out, and then opens at 801, 803 and 804 points of the circuit of relays R 610, R 720 and R 810; it interrupts in 802 the circuit of the dialing current and closes again in 805 the circuit to bypass its

  <Desc / Clms Page number 34>

 upper winding thus making its operation timed; it closes in 806 the holding circuit of relay R 820: it opens in 807 another point of its holding circuit, and again prepares in 808 its own actuation circuit and the circuit of electro 1107.



   While the R 750 relay performs the functions just described, the R 730 relay operates, and remains earthed at 733: it opens at 734 the actuation and holding circuits of the R 740 relay; it interrupts in 736 the charging circuit of the capacitor 748, in series with one of the recording relays, it closes at 735 a circuit for discharging the capacitor 748 on the resistor 738;

   it closes in 732 a multiplied circuit for the relay R 750, and closes in 731 a preparation circuit for the relay R 700, by means of the resistor 737. The current through this circuit is insufficient to produce the function. of the R 700 relay, but makes it extremely fast to operate when the looped circuit is closed again at the end of the open-circuit period of the pulse.



   When de-energized in response to the operation of relay R 730, relay R 740 drops out, and opens the circuit of relay R 750 at 741; it opens another point, at 742, of its own holding circuit, and interrupts one of the holding circuits of relay R 730; it opens in 743 the actuation circuit of relay R 730; it opens at 744 the holding circuit of relay R 710, and closes at 745 a second circuit to discharge capacitor 748 through resistor 738, and it opens a new point at 746 of the capacitor charging circuit, and interrupts the initially closed discharge circuit of the capacitor.



   As previously indicated, relay R 700 operates again when the looped circuit is closed at the end of the open circuit period of the pulse; he

  <Desc / Clms Page number 35>

 thus de-energizes relay R 730 at 701, and again closes at 702 the actuation circuit of relay R 710.

   Relay R 730 then interrupts in 731 the preparation circuit of relay R 700; it interrupts in 732 the circuit of relay R 750; it opens at 733 a new point of its holding circuit; it prepares again in 734 the actuation and holding circuits of relay R 740; it opens a new point at 735 of the initially closed circuit for the discharge of the capacitor eg and again prepares, at 736, the charge circuit of the capacitor 748, in series with one of the pulse recording relays.



   After releasing relay R 730, an operating cycle of this relay and of relays R 740 and R 700 to repeat a pulse received at the registration relays is completed. For the transmission of each additional pulse to the recorder-transmitter 19. these three relays operate exactly in the same way as that which has just been described.

   Note that a current pulse is transmitted to relay R 750 during the part of each pulse where either of the R 730 or R 740 relays is drawn, and that the circuit of the R 710 relay n 'is open only during the period between the release of relay R 740 and the re-energization of relay R 700.' 'Due to the delay on tripping of relay R 740, relay R 710 remains energized for the duration of the pulses, and the R 750 relay. remains attracted for the duration of each series of pulses.



   It is obvious that the capacitor 741 is charged in series with the upper winding of the second recording relay R 1310 of group n I, during the transmission of the second pulse. Relay R 1310 then maintains itself at conductor 666 by a circuit comprising its preliminary closing contact I3I3 and contacts 1325 and 1612, and transfers the capacitor charging circuit to 1311 and I3I2.

  <Desc / Clms Page number 36>

 to the upper winding of the re & ais R 1320; it closes in 1314 a multiple circuit to ground the conductor SH I, and in 1315 opens the holding circuit of relay R 1300, thus causing this relay to drop.



   The 3rd, 4th and 5th pulses transmitted to recorder-transmitter 19 cause relays R 1320, R 1330 and R 1340 to operate, in a clearly apparent manner. Each of these relays, when functioning, releases the previous recording relay, transfers the load circuit of the capacitor to the winding of the next recording relay and closes a multiple circuit to ground the conductor SH 1.

   The 5th recording relay R 1340, when working, also prepares in 1347 the circuit of relay R 1350 and again modifies the charging circuit of the capacitor to include the upper winding of relay R 1300 ,,
If the first digit has less than five pulses, relay R 1350 is not actuated, and the recording relay corresponding to the numerical value of the digit remains actuated at the end of its formation. Thus, if the digit comprises three pulses, the relay R 1320 remains attracted at the end of the formation of the digit.

   On the other hand, if the first digit has more than five pulses, the R 1350 relay and one of the five storage relays of group 1 are drawn at the end of the formation of the digit. Thus, during the transmission of the 6th pulse, the relay R 1300 attracts again, and is maintained in 1303 to the conductor 666 .. In this case, the upper winding of the relay R 1300 is energized in series with the capacitor 748, via contacts 1342 and 1352. In 1303, relay R 1300 also closes the circuit of relay R 1350, depending on the earth to conductor 666, 1612, 1313. 1303, 1347. 1351, the winding of R 1350 and the battery.

   While operating, the R 1350 relay is maintained at conductor 666, by its preliminary closing contact

  <Desc / Clms Page number 37>

        1353 it interrupts its actuation circuit in 1351, and interrupts the capacitor charging circuit in 1352, through which the upper winding of relay R 1300 passes. Subsequently, the remaining pulses of the digit are counted by the 2nd, 3rd , 4th and 5th recording relay of group n 1, exactly as described above. It is recalled that if the digit contains less than five pulses, only one of the five recording relays is actuated, at the end of the formation of the digit. As a result, the circuit of relay R 1220 is prepared at contact 1355 of relay R 1350 at the end of the formation of the digit.



   On the other hand, if the digit has more than five pulses, the R 1350 relay as well as one of the five save relays are pulled at the end of the digit formation. In this case, the circuit of relay R 1220 is kept open at 1355, and the circuit of relay R 1230 is prepared at 1354.



   At the end of the first digit, the circuit of relay R 750 is kept open at 732 and 741, for a period long enough to allow this relay to drop.



  On falling, relay R 750 prepares again, at 752, the holding circuit of relay R 630; it closes in 653 the circuit of electro 1107 of counting switch 1100 and closes in 751 the circuit of electro 957 of counting switch 950, according to the conductor SE 1 earthed by the relay of group n 1 which is drawn, 611, 902, 844, 751, 904, 845, the winding of the electro 957 and the battery.



   The electro 1107, while working, advances @ the wipers 1105 and 1106 towards their 2nd contacts; it opens another point of the circuit of relay R 750 and again closes, at 1107 a, the circuit of relay R 800. When the friction 1105 leaves its first contact, the charging circuit of capacitor 748, in series with recording relays

  <Desc / Clms Page number 38>

   of. group n I, is interrupted, and on its 2nd contact, a circuit comprising the conductor SP 2 is prepared, to charge the capacitor 748 in series with the storage relays R 1400, R 1410, etc ...

   forming group 2. When the II06 wiper leaves its first contact, another point is open in the dial current circuit and the R 820 relay circuit, but another circuit is closed by the 5th contact, depending on the earth to the conductor 665, 826, C 873, 1063, 1071, the wiper 1106, C 875, the winding, upper of R 820 and the battery, so that the relay R 820 is prevented from releasing.



   The electro 957, while working, advances the trotters 955 and 956 which come into contact with their first contacts; it opens at 957 b a point of the holding circuit of relay R 630, and earths at 957 a the conductor SM I, thus energizing one of the relays R 1220 and R 1230.



  If the first digit transmitted has less than six pulses so that the R 1350 relay is not attracted, the R 1220 relay is drawn, while if the first digit has more than five pulses, the R 1230 relay is energized. When the wiper 955 engages its first contact, a circuit is prepared for the relays R 1730 and R 1740, and when the wiper 956 engages its first contact, a circuit is prepared for the relay R 1610. As a result of the movement of the wipers, the contact blades 959 are brought together to prepare the R 520 relay circuit.



   The R 800 relay, when operating again, energizes the R 610 relay in 801, through the SE I conductor to earth; it prepares again, in 802, the circuit of the signal of, numbering; it prepares again in 803 and 804 the circuits of the relays R 720 and R 810; it opens in 805 the circuit bypassing its upper winding; it opens in 806 one of the holding circuits of relay R 820; it closes in 807 a

  <Desc / Clms Page number 39>

 holding circuit for itself, and it de-energizes in 808 the electro 1107 of the cipher count switch 1100.



    Electro 1107 then drops out, and interrupts in 1107 the actuation circuit of relay R 800, and again prepares in 1107 the circuit of relay R 750.



   The recorder-transmitter is now ready to receive the pulses of the 2nd digit; when the brushes of switch 1100 engage their second contacts, the relays of group 2, shown in fig 14, are controlled by relays R 730 and R 740. These relays collaborate with relay R 700, in response to the impulses of the 2nd figure, in the same manner as before, the circuit of relay R 750 being closed at 741 at the beginning of the open circuit period of the 1st pulse. In this case, the charging circuit of capacitor 748 is successively extended to include the active windings of relays R I400, R 1410, R 1420, R 1430 and R I440, as the pulses are received.

   This circuit initially comprises: the earth in 666, 1441, 1431, 1421, 1411, 1401, the upper winding of R 1400, the conductor SP 2, the wiper II05, C 876, 827, 736, 746, the capacitor 748 and the battery. The R 1400 relay then maintains to the driver 666 by its preliminary closing contact 1403, and
1415 and 1622; it interrupts the capacitor charging circuit at I40I; it extends it in 1402 to relay R 1410, and in 1404 closes a circuit to earth the conductor SH 2, through 622. Since the six relays of recording group n 2 are arranged identically like those of group n I, the way in which these relays are actuated successively is quite obvious.

   If the 2nd digit has less than six pulses, the storage relay which corresponds to the numerical value of the digit remains attracted at the end of the training, while if the 2nd digit has more than five pulses, the relay R 1450 as well as one of the five relays

  <Desc / Clms Page number 40>

 of storage are activated at the end of the formation of the figure.



   The relay R 750, while functioning, at the beginning of the 2nd digit, interrupts in 751 the circuit of the electro 957; it opens a point, at 752, of the holding circuit of relay R 630, and it de-energizes relay R 800 at 753. Relay R 800, when falling, interrupts the circuit of relay R 610 at 801; it opens in 803 and 804 the circuits of relays R 720 and R 810; it closes in 806 a multiple holding circuit for the relay R 820; it opens in 807 another point of its own holding circuit, and again prepares, in 808, the circuit of the electronics 1107 of the counting switch 1100.



   At the end of the 2nd digit, the R 730 and R 740 relays are kept de-energized, long enough to allow the release of the R 750 relay, which again closes, at 753, the circuit of the electro 1107. When operating, l 'electro 1107 moves the trotters 1105 and 1106 to their 3rd contact; it opens in 1107 b another point of the circuit of the relay R 750, and again energizes, in 1107 a, the relay R 800. When the wiper 1105 engages its 3rd contact, a circuit comprising the conductor SP 3 is prepared, to charge capacitor 748, in series with the group n 3 storage relays.



  When the slider 1106 engages its 3rd contact, the holding circuit of the R 820 relay is modified again to include 1053 and the conductor 1072 instead of 1063 and the conductor 1071.



   The R 800 relay, while operating at this moment, activates the R 720 relay in 803, by the conductor SE 2; it remains earthed at C 661 by 807, and de-energizes the electro 1107 in 808. , on falling, interrupts in 1107a the circuit of relay R 800 and again prepares in 1107 b the circuit of relay R 750.



   The pulses of the 3rd digit transmitted to the

  <Desc / Clms Page number 41>

 - recorder-transmitter are repeated by relays R 730 and,
R 740 to the relays of group n '3, shown in fig 15.



   In this case, the charging circuit of the capacitor 48, as initially closed, comprises the earth to the conductor 666, the upper opening contacts, connected in series, of the relays R 1500, R 1510, R I520, R 1530 and R 1540, the top winding of R 1500, the conductor SP 3, the wiper
II05, C 876, 827, 736, 746, the capacitor 748 and the battery. This load circuit is obviously modified successively to include the windings of the following group 3 recording relays, when the pulses of the
3rd digit are received. Each of these relays, when functioning, holds on to the earthed conductor 666, for example
1602, opens the holding circuit of the previous relay and closes its lower closing contact, to earth conductor SH 3, thus preparing the circuit of relay R 810.



   The relay R 750 is attracted again at the beginning of the 3rd digit, and de-energizes the relay R 800 in 753, which again prepares, in 808, the circuit of the electro 1107. This circuit is closed in 753 when the relay R 750 drops out at the end of the 3rd digit, and wipers 1105 and II06 are moved to their 4th contact, and contact 1107 has energized relay R 800 again. Relay R 800, while operating, energizes relay R 810 in 804.



   Thus, the count switch 1100 advances one step after each digit, and the charging circuit of the capacitor 748 is re-prepared, so that the pulses of the next digit are directed to the next group of recording relays. As the wiper 1106 occupies successively different positions, the holding circuit of the relay R 820 is again arranged to include different groups of opening contacts I063, 1053, I043, etc ...,

  <Desc / Clms Page number 42>

 controlled respectively by the number marking relays, shown in figs 9 and 10.



   Considering the way in which the recorder-transmitter works to retransmit the digits stored in the record-relay group, we will first assume that the communication in question is intended for station B, so that the transmitting relays transceiver pulses are reversed while the link is being established, and further that this station is designated by the call number "45678".

   In this case, relay R 1330 is left drawn in group n I, at the end of the first digit, relay R 1440 is left drawn at the end of the 2nd digit, relays R 1500 and R 1550 at the end of the 3rd digit, relays R 1310 and R 1350 at the end of the 4th digit, and relays R 1420 and R 1450 at the end of the 5th digit. As we will see, the first digit is transmitted from the recorder-transmitter 19, and the record relay group n 1 is conditioned to receive the 4th digit a good time before the actual transmission of the 4th digit by the calling station.

   In the assumed case, the first digit is also used to indicate to the recorder-transmitter the number of digits which it will receive during dialing; for this purpose, terminal 4 of row 3 is connected to terminal 5 of row I, to the connection frame II shown in fig 12.



   The actual transmission of the 1st digit to the selector part of group 15 begins immediately after the pulses of that digit have been transmitted to the recorder-transmitter. Thus, when the electro 957 is drawn at the end of the 1st digit, to energize the relay R 1220, the latter closes in 1224 the circuit of the relay R 1020, according to the earth to the conductor 666, 1336, 1224, the connection between the row 3 terminal 4 and row I terminal 5, conductor 5 D, 1021, R winding 1020 and battery.

   When he

  <Desc / Clms Page number 43>

 is thus energized, relay R 1020 is maintained first of all at conductor 665 by its preliminary closing contact 1025; it interrupts its actuation circuit in 1021; it opens in 1023 the circuit by which the 5th marking conductor 1075 is normally earthed, by 813 and 8V4. thus preparing the R 820 relay to be released after receiving 5 digits; it connects conductor 965 to earth in 1022, through 1025 and conductor 665, thus establishing a circuit to release the recorder-transmitter after it has transmitted 5 digits, and closes in 1024 a circuit for the relay R 840.



   While operating, the relay R 840 is maintained by 849 'to the conductor 665, 849 and 849'; it grounds the IOth contact of group 951; it opens in 841 the circuit of relay R I220, causing it to drop; he prepares in 842 a circuit for the relay R 1720; it prepares in 843 a circuit for the relay R 460 of the group of preselectors 15, and the pulse relays of the switches following this group, in series with the relay R 1760; he opens in 844 and 845 a circuit for the electro 957; he prepares in 846 a new circuit for the electro 957; it closes at 847 a point of the return call signaling and busy signaling circuits; it also opens, in 848, a new actuation circuit for itself.



   Shortly after the operation of relay R 840, relay R 610 is energized, and remains at 612 with the conductor SH 1 earthed; it opens in 611 the circuit of the electro 957; it interrupts in 614 the circuit comprising @ the conductor 633, on which is normally placed a ground by the marking conductors 1073 and I076, ending in the 4th and 7th contacts of the group of contacts 1103, and closes in, 613 the circuit of the relay R 1610, by the earth, 608, 613,. The ... 'wiper 956 and its Ist contact, the conductor OS I, 1717,

  <Desc / Clms Page number 44>

 the winding of R 1610 and the battery.



   The relay R 1610, while operating, first closes its preliminary closing contact 1611, and then opens its contact 1612, thus incorporating 1718 'in the holding circuit of the relay R 1330, and in the circuit by which the earth is put. on conductor SE 1, 'so that relays R 1330 and R 610 are placed under the control of relay R 1710.



  In 1616, 1617, 1618 and 1619, the R I6IIO relay connects the five lowest marking conductors of group n 1 to the terminals of the R 1630, R 1640, R 1650 and R 1660 relays by the conductors 1691, 1692, 1693, and 1694 respectively, thus closing a circuit for the lower winding of relay R 1630 Relay R 1610 also closes in 1614 the circuit of relay R 1680, according to conductor 666 to earth, 1356, I6I4, 1716 the winding of R 1680 and the battery, and opens in 1613 the pulse circuit by which the battery pulses are transmitted first to relay R 460 of group 15, then to the pulse relays of the following switches of the train.



   The R 1630 relay, while functioning, is maintained to the earth by a circuit comprising its preliminary closing contact 1633, 1645 and 1723; in 1631 he interrupts the circuit of his upper winding; in 1632 he prepared a circuit for the upper winding of the R 1640 relay; it opens in 1635 a point of the holding circuit of relay R 1670 and closes in 1634 the circuit of relay R 1710, according to conductor 666 to earth, 1723? 1634, 1742, 1714. the winding of R 1710 and the battery.



   The relay R 1680, while functioning, is maintained by 1684 to the conductor 666 put to the ground; in 1682 he opened a point of a circuit for the upper winding of R 1630; he opened in 1681 a point of a new circuit for himself, and in 1683 prepared a circuit for the relays R 1730 and R 1740.



   The R 1710 relay, while functioning, is maintained

  <Desc / Clms Page number 45>

 to earth by its preliminary closing contact 1713, and in 1714 interrupts its actuation circuit; it prepares in 1712 holding circuits for the relays R 1720 and R 1740; in 1711 he prepared a circuit for the R 1730 and R 1740 relays;

   he is preparing in I7I5 a new circuit for the 957 electro; it interrupts in I7I6 the actuation circuit of relay R 1680; and de-energizes relay R 1610 in 1717; in 1716 'and 1718, it opens points of the circuits of relays R 1600 and R 1620; in 1718 'he opened the holding circuits for the relays R 1330 and R 610, thus causing these two relays to drop, and again prepared, in 1719, the pulse circuit.



   Thus, after the operation of relay R 1710, the digit information stored in relay group n 1 is transferred to the pulse counter relays of fig. 16 and after this transfer is carried out, the relays R 1610, R 1330 and R 610 are de-energized, while the relay R 1220 is de-energized in response to the operation of the relay R 840. The relay R 610, when falling, also interrupts , at 612, its own holding circuit; he prepares again, in 611, the circuit of electro 957; it opens at 613 another point of the relay R 1610 circuit, and again applies, at 614, an earth to the 4th and 7th contacts of group 1103.



   Relay R 1610, on falling, again prepares in 1612, the earthing circuit of conductor SH 1 and the holding circuits of the recording relays of group n 1; it opens at 614 another point of the circuit of relay R 1680; in 1615 it opens another point of the relay circuit @ R 1710;

   it disconnects in I6I6, 1617, 1618 and 1619 the marking conductors of group n 1 of relays R 1630, R 1640, R 1650 and R 1660, and closes in 1613 a circuit for relays R 1760 and R 460, in series, depending on the earth, 477, 478, the bearing of R 460, 451, 362, the conductor 35 b, 531, the wiper

  <Desc / Clms Page number 46>

 556, conductor 36b, 843, 851, conductor OP, 1702, 1719, 1623, 1613, 1609, 1724, 1733, 1754, the winding of R 1760 and the battery. When it is thus excited, the relay R 1760 is maintained in 1762 at the driver OP, and in 1761 energizes the relay R 1750.



   The R 1750 relay, while operating, interrupts in 1754 the actuation circuit of the R 1760 relay; in 1755 he opened a point in the circuit to transmit the pulses directly to the OP conductor; in 1753 it opens a point of the actuation circuit of relay R 1740; in 1751 he opened the normally closed low resistance circuit for discharge. ge of capacitor 1756, and in 1752 it closes a circuit to charge capacitor 756, in series with the upper winding of relay R 1640.

   The load current flowing initially through this circuit is sufficient to cause the operation of the @@@@@ relay R 1640, which first stays earthed by its preliminary closing contact 1643, then disconnects its contact at 1641. upper winding of the capacitor charging circuit; it incorporates in 1642 the upper winding of relay R 1650 in the charging circuit of the capacitor; it interrupts in 1645 the holding circuit of relay R 1630, and prepares in 1644 a circuit for relay R 1710.



   The relay R 1760 remains attracted until the relay R 450 operates, in the manner previously described; the circuit of the relay R 1760 is then opened in 451. When falling, the relay R 1760 again interrupts, in 1762, its holding circuit, and in 1761 opens the circuit of the relay R 1750.



  This last relay, on falling, again prepares, in 1754, the pulse circuit, and again in 1755, prepares the circuit to directly transmit the earth pulses to the OP conductor, it prepares again, in 1753, the R 1740 relay circuit; in 1752 he interrupts the charging circuit

  <Desc / Clms Page number 47>

 capacitor 1756, and in 1751 discharges capacitor @ 1756 on resistor 1725.



   The way in which the R 1760 relay is energized successively on the command of the R 460 and R 450 relays of group 15 will be clearly apparent from the explanation given above. Each time the R 1760 relay operates, it holds on to the OP conductor in 1762, and energizes the R 1750 relay in 1761. Each time the latter relay operates, it closes in 1752 the circuit to charge the capacitor 1756. This The circuit is transferred successively to incorporate the windings of the relays R 1650, R 1660 and R 1670. Each time the relay R 1750 drops, it discharges the capacitor 1756 on the resistor 1725.



   After four pulses have been counted by the pulse counter relays, the pulse transmission ceases. Since relay R 1670 operates in response to the 4th operation of relay R 1750, in 1672 it closes the circuit of relay R 1730, according to: conductor 666 to earth, 1672, 1683, the winding of R 1730 and battery. The R 1730 relay, when operating, interrupts the R 1760 relay circuit in 1733; it opens in 1731 a point of the load circuit of the capacitor 1756, and closes in 1732 a circuit to discharge the capacitor 1756 on the resistor 1725. Shortly after the operation of the relay R 1730, the relays R 1760 and R 1750 are successively released by relay R 450 of group 15. Relay R 1750, on falling, closes in 1753 the circuit of relay R 1740.



   When the relay R 1730 is attracted and the relay R 1760 released, no circuit is possible to energize the relays R 460 and R 1760 in series when the relay R 450 drops out, and thus the transmission of pulses to the relay R 460 of group 15 is stopped after four pulses. The R 1740 relay, while functioning, is maintained by 1741 to the earth,

  <Desc / Clms Page number 48>

 to conductor 666, by 1712; it opens in 1742 another point of the actuation circuit of the relaix R 1710, and closes in 1743 a circuit for the electro 957, according to the earth to the conductor 666, 1715, 1743, the MO conductor, 846, the winding of the elec 'e tro 957 and the battery.

   The electro 957, therefore, advances the wipers 955 and 956 and brings them to their 2nd contacts; it opens in 957 b a point of the holding circuit of relays R 630 and R 850, and closes in 957 a circuit for the relay R 1720, according to; the earth to the conductor 665, 957 a, 842, the conductor LO, l winding of R 1720 and battery. Relay R 1720 is maintained through 1721 to conductor 666 through 1712; in 1723 it opens a point in the holding circuits of the pulse counter relays, thus releasing the relays R 1670 and R 1680; in 1724 it opens another point of the pulse circuit, and in 1722 opens the holding circuit of relay R 1710.



   Relay R 1710 then drops out, and further interrupts, in 1713, its own holding circuit; in 1714, he prepared his own holding circuit again, in 1711 he opened a point in a new circuit for relays R 1730 and R 1? 40; in 1715 he opened the circuit for electro 957; in 1716 he again prepared the circuit for relay R 1680; he prepared again in 1716, 1717 and 1718, the circuits of the relays R 1600 R 1610 and R 1620; he prepared again in 1718 ', the holding circuit of his three relays and the relays of the three groups of recording relays; in 1719 it opens another point of the pulse circuit, and in 1712 interrupts the holding circuits of the relays R 1720 and R 1740.



   The relays R 1670 and R 1680, by falling, interrupt in 1672 and 1683 the circuit of the relay R 1730, which, by falling, again prepares, in 1733, the impulse circuit, and prepares again, in 1731. , the load circuit of the capacitor 1756. In 1672 and 1683, the relays R 1670 and R 1680

  <Desc / Clms Page number 49>

 also interrupt the operating circuit of relay R 1740, which again prepares, by falling, the circuit of relay R 1710, and again interrupts, in 1741, its own holding circuit.



   Electro 957, when it drops, in response to the release of relay R 1710, interrupts at 957 a the actuation circuit of relay R 1720, which drops out as a result. After releasing relay R 1720, the first digit stored in relay group n I, and subsequently transmitted to the pulse counter relays, is transmitted to the selector part of group 15. In addition, the relay equipment emission of pulses of FIGS. 16 and 17 is now ready to transmit the 2nd digit, that is to say the one registered in the 2nd registration relay group, to the selector entered by the selector of group 15 during its exploration movement. .



   After the reception by the group of recording relays n 2 of the pulses of the 2nd digit, the relay R 1720 is energized by the conductor SH 2, during the operation of the relay R 800, during the interval between the 2nd and the 3rd. figure. Therefore, the relay R 720 is maintained at 722 at the conductor SH 2; it opens in 721 a point of a circuit for the electro 957, it disconnects in 724 the conductors 1074 and 1077 of the conductor 665, and energizes the relay R 1620 in 723, according to: the earth to the conductor 665, 723, the wiper 957 and its 2nd contact, the OS 2 conductor, 1716 ', the winding of relay R 1620 and the battery.



   While operating, the relay R 1620 incorporates in 1621 and 1622 the contact 1718 'in the holding circuit of the relays R 1440 and R 720, it opens a point, in 1623, of the pulse circuit, it connects in 1626, 1627 , 1628 and 1629 the 4 marking conductors of relay group 2 to relays R 1630, R 1640, R 1650 and R 1660, through conductors 1691, 1692, 1693 and 1694, and energizes in 1625 the

  <Desc / Clms Page number 50>

 relay R 1710.



   The R 1680 relay, while functioning, is maintained by 1684 at the conductor 666, it interrupts in 1681 one of its own actuation circuits, it interrupts in 1682 a circuit of the R 1630 relay, and prepares the circuits in 1683. relays R 1730 and R 1740. The relay R 1710, while operating, is maintained by 1713 to the conductor 666;

   in 1716 'it de-energizes the relay R 1620; in 1718 'it de-energizes the relays R 720 and R 1440, and in 1719 it prepares the pulse circuit, which is closed in 1623 when the relay R 1620 is released. Five pulses are then transmitted to the 2nd selector, by example the selector 16, entered by the selector part of the group 15, exactly in the same way as described above, for the transmission of the pulses of the 1st digit.



   When this is finished, the relays R 1670, R 1730 and R 1740 are actuated successively, as described previously, and the relay R 1740 energizes in 1743 the electro 957, to bring the wipers 955 and 956 on. their 3rd contacts. Electro 957, in 957 a, also actuates relay R 1720, which causes de-energization of electro 957, release of relays R 1670 and R 1680, as well as release of relays R 1710, R 1730 and R 1740, as described above.



  When the relay R 1710 and the electro 957 drop, the relay R 1720 is released; therefore, the pulse counter relays are conditioned to receive the information established in the recording relay group n 3 , and the pulse emitting relays are conditioned to repeat the required number of pulses to the pulse circuit.



   The transmission of the pulses constituting the 3rd digit by the recorder-transmitter 19 begins when the relay R 810 operates, during the interval between the 3rd and the 4th digit. While operating, relay R 810 is maintained by 811 to conductor SE 3; he disconnects in 813

  <Desc / Clms Page number 51>

 the 5th and 8th marking conductor (1075 and 1078) of the earth, and energizes relay R 1600 in 802, according to: 'earth to conductor 665, 812, wiper 956 and its 3rd contact, conductor OS 3, I7I8, the winding of R 1600 and the battery.



   Therefore, the relay R 1600 incorporates the contacts I7I8 'in 1601 and 1620 in the holding circuits of the relays R 1500, R 1550 and R 810; it connects in I605, 1606, 1607 and 1608 the marking conductors of group n 3, through conductors I69I to 1694, to relays R I630 R I640, R 1650 and R 1660; it closes a point, in 1603, of a circuit for the relay R 1680; he prepares in 1604 a circuit for the relay R 1710, and opens a point, in 1609, of the pulse circuit which circuit is now extended to a connector such as 17.



   The relay R 1660, while operating, due to the excitation of the relay R 1500, is maintained in 1663 at conductor 666; in 1662 it incorporates the upper winding of relay R 1670 in the load circuit of capacitor 1756; in 1665 it opens a point of the holding circuit of relay R 1650, and in 1664 energizes relay R 1710.



   While operating, the relay R 1710 de-energizes in 1718 and I7I8 'the relays R 1600, R 1500, R 1550 and R 810. This last relay, when falling, again interrupts, in 811, its holding circuit, it interrupts again , at 812, the circuit of relay R 1600, and earth again, at 813, the conductor 1078, through the intermediary of the conductor C 874.



   The relay R 1710 also prepares in 1719 the pulse circuit which is closed in 1609 to start the emission of the pulses when the relay R 1600 is released. The way in which the current pulses are transmitted to the pulse relay of the third selector of the train and of which the relay R 1760 is controlled in return by the switch

  <Desc / Clms Page number 52>

 takes place exactly as explained above. The transmitted pulses are counted by the pulse counter relays and since the R 1660 relay is initially actuated, a total of six pulses will be transmitted before the pulse emitting equipment is released.

   Thus, when the R 1670 relay operates, it remains earthed through 1673, 1635 and 1723; in 1672 he prepares the circuit for charging the capacitor 1756 through the winding of the relay R 1630, and in 1675 prepares a circuit for the relay R 1680. When the relay R 1750 operates the next time, the capacitor 1756 is charged in series with the upper winding of relay R 1630, which attracts, and maintains itself on conductor 666, by its preliminary closing contact 1633, and also energizes relay R 1680 according to: earth to conductor 666, 1723, 1645, 1633, 1675 , 1681, the winding of R 1680 and the battery.

   When the relay R 1680 is attracted, the conditions are as previously described, and after four additional pulses have been transmitted, the relay R 1670 is attracted, and energizes in 1672 the relays R 1730 and R 1740, and thus produces the release of pulse-emitting equipment, exactly as explained above. Following the release of this equipment, a current pulse is transmitted to the electro 957 and therefore the wipers of the switch 950 are brought to their 4th contacts.



   The wipers of the switch 950 being in the 4th position, and when the relay R 610 operates following the registration of the 4th digit of the group of registration relays n I, a circuit is closed via the wiper 956 and of the driver OS 1 for the relay R 1610. This relay, while functioning, causes the transmission of the pulses of the 4th digit to the 3rd switch of the train by which the link is routed to the called line. It will appear by examining the wiring of these three OS conductors to the indoor group.

  <Desc / Clms Page number 53>

 contact 954 of the switch 950, that the relays R 1610, R '1620 and R 1600 are actuated successively, under the control of this switch.

   Each of these relays, in operation, connects the group of recording relays associated with the pulse counting relays of fig. 16, and causes the operation of the pulse emitting relays, to transmit the digit to the associated switch train.



   In the present case, where five digits are transmitted to the recorder-transmitter and are repeated at the automatic switches by which the link is extended to the desired line II, the recorder-transmitter 19 is automatically released after these numbers were received and retransmitted. Due to the movement of the wipers of switch 1100, to reach their 6th contacts, at the end of the 5th digit, the electric 1107 energizes the relay R 800 in 1107 a.

   In this case, the R 800 relay de-energizes the R 820 relay at 806, in addition to the other functions it already performs, as described previously, since its other circuit is open at 1023. The R 820 relay switches on. stops at 826 its hold circuit at a point, and opens at 827 the charging circuit of capacitor 748 in series with the recording relays; at 828 he prepares a circuit for relay R 620; he prepares again, in 829, the circuit to connect the 36 o conductor directly to the earth; it opens @ a point in 825, of the circuit of relay R? 50; it opens in 824 the circuit short-circuiting the contacts of the alarm key 705; it prepares in 823 a circuit for the relay R 830;

   it opens at 822 a point of the dialing signal circuit, and closes at 821 the ringing signal circuit, which comprises 1 the inrush current generator of the common equipment 32, 0 9? 2 , 862, the capacitor 859, 847, 821, the capacitor 747, 621, the capacitor 36 a, the wiper 557, 532, the conductor 35 a, 301, the negative wire of the looped circuit, the receiver of the station caller, the positive wire, and the generator

  <Desc / Clms Page number 54>

 inrush current.



   The recorder-transmitter is kept activated until the five digits have been retransmitted by it.



  After the fifth digit is transmitted, the wipers of the switch 950 are brought to their 6th contacts, and a circuit is closed by the wiper 955, for the relay R 850, according to: earth to conductor 665, 1025, 1022, conductor 965, the 955 slider and its 6th contact, the R 850 winding and the battery.

   When operating, relay R 850 interrupts the pulse circuit at 851; it prepares the circuit for relay R 640 in 852, it opens a point in the holding circuit of relays R 630 and R 830 at 853; it closes in 854 a holding circuit for itself; it prepares in 856 the circuit of the relay R 650; it opens in 855 a point of the circuit of relay R 630, and it closes in 857 the circuit of relay R 620, according to: earth, 828, 865, 857, the rest position contacts 959 and II09, in parallel, l lower winding of R 620 and battery.

   When it is thus excited, the relay R 620 is maintained by 624 il. earth in 605; it closes at 626 another holding circuit for itself; it opens at 623 a point of the excitation circuit of its upper winding; it opens at 622 another point of the individual circuit of relay R 500; it releases relay R 700 at 621, and opens the return call circuits, thus terminating the return call signal reproduced at the calling station; it disconnects at 625 the conductor C 661 from the earth, thus de-energizing the control relay R 800;

   it disconnects at 627 the conductor 36 c from the earth to the recorder-transmitter 19, thus causing the operation of the group 15, and the release of the recorder selector 18, in the manner previously described, and closes at 628 circuits for the 958 and 1108 release appliances.



   The R 700 relay, when operating, de-energizes

  <Desc / Clms Page number 55>

 1108. The recorder-transmitter is then completely brought back. idle, and can be used to establish another link.



   If the recorder-transmitter 19 is seized by a calling line, the dialing operation being partially executed and the communication then abandoned, the opening of the calling loop causes the successive release of the R 700 relays. and R 710, and the latter de-energizes relay R 600 at 712, and closes a circuit for relay R 620 at 713, via 867. 858 and contacts 959 and 1109. While operating, relay R 620 remains earthed. in 624 and 626; it activates in 628 the electros 958 and 1108, as described, it disconnects the 36 c and 35 c conductors from the earth at 627, and opens at 625 a point of the relay circuits R 800 and R 820.

   The relay R 600, on falling, disconnects from the earth, at 601 and 608, the conductors 666 and 665, so that all the relays which are attracted drop out, with the exception of the relay R 620.



  When switches 950 and 1100 are released, contacts 959 and 1109 are separated, to de-energize relay R 620, which de-energizes at 628 the appliances 958 and 1108. After releasing these appliances, the recorder-transmitter came back to rest entirely.



   The necessary steps are taken in the recorder-transmitter to prevent the pulses from being directed to any of the three groups of recording relays of figs. 13, 14 and 15, when a number is already stored there.



  Each of the three relays R 610, R 720 and R 820 is actuated immediately after a digit is registered in the associated registration relay group, and remains attracted until the registered digit is transferred to the relays. pulse counters, and the drawn relays of the associated group are released to condition that group for recording another digit. Thus the R 610 relay is controlled by the

  <Desc / Clms Page number 56>

 in 702 the relay R 710, and energizes in 701 the relay R 740. This last relay, while operating, excites in 743 the relay R 730, and closes in 744 another circuit for the relay R 710. The relay R 730, in operating, remains earthed at 733, 711 and 701, and de-energizes relay R 740 at 734. This last relay, when falling, de-energizes relay R 710 at 744.

   Relay R 710 then drops out, and de-energizes relay R 730 at 711; it prepares in 713 a circuit for the relay R 620; it closes at 714 a point in the circuit for earthing the 6th and 9th contacts of contact groups 953, and de-energizes the R 600 relay at 712. Releasing relays R 730 and R 800 has no effect. .



   Relay R 600, on falling, disconnects conductor 666 from earth at 601, and thus opens the circuits of all the relays of fig. 12 to 17, with the exception of relay R 1760, however, at this moment, all these relays have already dropped. The relay R 600 also disconnects the conductor 36 d from the earth at 602, thus marking the free conduction of the recorder-transmitter 19; it prepares again, in 603, the individual circuit of relay R 500;

   it opens at 604 a point of a circuit of relay R 630; it opens in 605 one of the maintenance circuits of relay R 620; it closes in 606 a multiple circuit for the relay R 620; it opens at 607 another point of the earthing circuit of conductors 36 c and 35 c; it disconnects at 609 the common starting conductor 660 from the earth in the recorder-transmitter 19, and disconnects at 608 the conductor 665 from the earth, thus releasing relays R 1020, R 850, and R 840.



   When the electro 958 is energized, the trotters 955 and 956 return to the rest position, and the contacts 959 separate, to open a circuit for the relay R 620.



  Likewise, when the electro 1108 is energized, the trotters 1105 and 1106 return to rest, and the contacts 1109 separate, to interrupt the other circuit of the relay R 620., The relay R 620 then drops out, and de-energizes at 626 appliances 958 and n

  <Desc / Clms Page number 57>

 relay R 800, to be attracted during the interval between the 1st and the 2nd digit, and remains attracted until the relay R 610 operates, to transfer the registration of the group of relays n I to the counting relays of pulses, and relay R 1720 subsequently operates, to de-energize the attracted relays of recording relay group n I.

   As long as the R relay 610 is attracted, the circuit for grounding the 4th and 2nd marking conductors 1073 and 1076 is kept open, at 614. Therefore, if the switch 1100 is actuated so whether its wipers are on their 4th or 7th contacts, at a time when the relay R 610 is energized, the circuit of the relay R 820 is opened by the wiper 1106, this condition only taking place when the three groups of relays of recording have numbers recorded there. If this occurs, relay R 800 when it is energized in response to operation of electro 1107 to advance wipers 1105 and 1106 to their 4th contacts, releases relay R 820 at 806.

   Subsequently, the relay R 820 interrupts in 827 the charging circuit of the capacitor 48, in series with the recording relays, it prepares the circuit of the relay R 620 in 828, and opens the circuit of the relay R 750 in 825 If the record made in relay group n I is transferred to the pulse counter relays and this record relay group is released before the next digit, for example the 4th digit, is numbered in l 'recorder-transmitter 19, the control relay R 820 is re-drawn, to allow the transmission of the pulses of the 4th digit to the recording relays of group n I, as desired. This happens because when the registration relay group is released, relay R 610 is also released, and again closes, at 614, the circuit of relay R 820.

   If relay R 820 is not reactivated before dialing the 4th digit, communication is missed. In this case, some or all of the pulses

  <Desc / Clms Page number 58>

 received are absorbed, and the communication can only be forwarded to a false destination at best. If only part of the pulses of the 4th digit are absorbed before relay R 820 operates again, to direct the remaining pulses of the digit to the group of recording relays n I, the digit is not completely lost, and therefore the operation of the recorder-transmitter continues exactly as previously described.

   On the other hand, if the 4th digit and any subsequent digits are fully absorbed during the period when the relay R 820 is de-energized, the switch 950 has an insufficient number of digits to produce the operation of the relay R 850 and the release. resulting automatic recorder-transmitter after all properly received digits have been transmitted from the pulse-transmitting relays to the associated switch train. Under these circumstances, the recorder-transmitter 19 and the train of automatic switches are released automatically under the control of the timing equipment 31, as explained previously.



   Relays R 720 and R 810, by discharging their function of controlling the earthing circuits of conductors 1075, 1074, 1077 and 1078, can also enter the release of relay R 820, in the same way as to be explained. If the three groups of recording relays simultaneously contain recorded digits, which of the 3 relays R 610, R 720 or R 810 will release the relay R 820 depends on the particular point of the numbering operation having been released.



   With the wiring mode shown, the transmitter recorder is arranged to be released automatically after the single digit "0 is transmitted to it by a calling station, and the 10 pulses of the digit are retransmitted to the selector part of the group by the intermediary of which the issuer is

  <Desc / Clms Page number 59>

 grasped. It should be remembered that the number "0" is used to designate the lines leading to the trunk panel 30.



  In order to effect the automatic release of the transmitter after the transmission of this digit, terminal 10 of row 3 of fig. 12 is connected to terminal I of row I.



  With this device, relay R 1230, during its momentary operation due to operation of electro 95? when the R 750 relay drops out at the end of the first digit, closes a circuit for the R 1060 relay, according to: earth at 666, 1346, 1235, connection of terminal 10 of row 3 with terminal 1 of row I, the 1 D conductor, I06I, the winding of R 1060 and the battery. While operating, the R 1060 relay is held on to the driver @@@@ 665 by its preliminary closing contact 1065; it interrupts its actuation circuit at I06I; it prepares in 1065 and 1062 a circuit comprising the conductor 961 for the relay R 850, and opens in 1063 the circuit by which the earth is normally connected to the conductor 1071.



   When the relay R 1060 is attracted, to remove the earth from the conductor 1071, one branch of the holding circuit of the relay R 820 is open to the wiper 1106, when the latter advances to cover its 2nd contact, and the other branch is open in 806, in response to the operation of the relay R 800, during the operation of the electro 1107. The relay R 820 is thus released, and, as previously described, prevents subsequent pulses from being transmitted to the relays d The pulse recorder closes the ringback signal circuit and conditions the recorder-transmitter to be released, when the 10 digit pulses are transmitted.

   When this has taken place, the electro 957 is actuated to advance the wipers of the switch 950 to their 2nd contacts and the pulse emitting relays are released. When the wiper 955 reaches its contact, a circuit is closed for the

  <Desc / Clms Page number 60>

 relay R 850, according to 1 the earth in 665, 1065, 1062, the conductor 961, the wiper 955 and its 2nd contact, 923, the winding of R 850 and the battery. The relay R 850, when operating, initiates the release of the recorder-transmitter 19 and of the recorder selector 18, as explained previously.



   By examining the wiring of the circuits controlled by relays R 940, R 1000, R 1010, R 1020, R 1030, R 1040, R 1050 and R 1060 that by appropriately joining the terminals of rows 3 and I of fig. 12, the release of the recorder-transmitter may be effected after any number of digits have been transmitted to the recorder-transmitter and retransmitted by it.

   It will also be noted that depending on the way in which the terminals of rows I and 3 are combined, any numerical value of the 1st digit can be used to give the indication of the total number of digits to be received and transmitted * With the wiring mode shown, a received digit of one, two, three or four pulses indicates that a total of five digits will be received since terminals 1, 2, 3 and 4 of row 3 are joined at terminal 5 of row I. The number 9 marking relays are controlled directly by the ID conductors to 9 D, and are arranged to establish different circuits, by the corresponding contacts of the contact sets 951 and 952, to energize the relay R 850, after the corresponding number of digits has been transmitted.

   This circuit, controlled by relays R 1040, R I030, R 1020, R 1010, R 1000, R 940 and R 840, which correspond respectively to the numbers comprising 3, 4, 5, 6, 7, 8 and 9 digits - fres, is designed to be extended directly to the R 850 relay from that of the marking conductors 963, 964, 965, 966, 967, 968 and 969 which corresponds to the selected marking relay. If relay R 1060 or relay R 1050, which correspond to 1 and 2 digit numbers respectively, is actuated, the R 850 relay circuit starts from 961 or 962 through

  <Desc / Clms Page number 61>

 923 or 933, thus making the circuit capable of being controlled by relays R 920 and R 930.



   If it is the numerical value of the 2nd digit, rather than that of the 1st digit, which is used to inform the transceiver of the total number of digits that will be received, the terminal of row 3 which corresponds to the numerical value of the 1st digit is connected to terminal 1 of row 2, and the terminal of row 4 corresponding to the numerical value of the 2nd digit is connected to the terminal of row 1 which corresponds to the total number of digits that will be received. Thus, with the arrangement shown, it is desirable, as regards the processing of calls to be routed by the 2nd selectors of the group comprising the selector 20, to use the 2nd digit of the call numbers for the purpose of informing the recorder-transmitter of the total number of digits.

   This group of selectors is designated by a 1st digit of six pulses, and thus terminal 6 of row 3 is connected to terminal 1 of row 2. Moreover, since special lines, accessible to the 2nd selector 20, are designated respectively by call numbers 631, 621 and 681, and each of these numbers has 3 digits, terminals 2, 3 and 8 of row 4 are joined to terminal 3 of row I.



   With this wiring mode, relay R 1230, operating momentarily after a first digit of six pulses, closes a circuit in 1231 for relay R 900, depending on the earth to conductor 666, 1306, 1231, the connection combined - on terminal 6 of row 3 and terminal I of row 2, conductor 2 DT, 906, the winding of R 900 and the battery.



  While operating, the relay R 900 is maintained first in 908 to the conductor 665; it opens its actuation circuit in 906; in 907 he prepared circuits for relays R 840 and R 850; it connects the OP pulse conductor at 901 to the wire of

  <Desc / Clms Page number 62>

 positive line 36b; and prepares circuits in 903 and 905 for relays R 1200 and R 1210, and opens in 902 and 904 the circuit of electro 957, causing the release of this electro, and de-energizing at 957 the relay R 1230.



   If a second digit of eight pulses is numbered when relay R 900 is pulled, relays R 1450 and R 1420 are actuated at the end of digit formation.



  Relay R 750, falling at the end of the digit, closes a circuit for relay R 1210, depending on the earth to conductor 666, 1622, 1424, conductor SH 2, 721, 903, 844, 751, 905, conductor SM 2, 1454, the winding of R 1210 and the battery. If the second digit has less than six pulses, so that, relay R 1450 is not attracted, relay R 1200 is energized through 1455, instead of relay R 1210. When operating, relay R 1210 closes in 1213 a circuit for relay R 1040, according to: earth in 666, 1426, 1213, the connection of terminal 8 of row 4 to terminal 3 of row I, conductor 3 D, 1041, l winding of R 1040 and the battery.

   When operating, relay R 1040 is maintained at 1043 to the driver @@ 665; it disconnects in 1043 the conductor 1073 from the earth, to indicate that three digits will be received; in 1041 he opened his own operating circuit; it closes in 1042 and 1045 a circuit to ground the conductor 963, to indicate that three digits must be transmitted, and in 1044 closes the circuit of the relay R 840.



   While operating, the R 840 relay maintains itself to earth at 849 '; it closes in 849 holding circuits for itself and for the relay R 900; it opens at 841 a point of the circuit of relays R 1220 and R 1230; it establishes at 843 a multiplied connection between the pulse conductor OD and the line conductor 36b; it de-energizes relay R 1210 in 844; it connects the electro 957 at 846 to be controlled via the MO conductor, by the pulse emitting relays of FIG. 17, and connects relay r in 842

  <Desc / Clms Page number 63>

 R 1? 20 to be controlled by the intermediary of the LO conductor by the electro 957.



   Note that the transmission of the first digit "6" received begins immediately as soon as this digit is registered in relay group n I, and that the digit can be transmitted completely before the second digit is registered in relay group n 2. Transmission of the first digit begins in response to the successive operation of relays R 800 and R 610, which takes place during the interval between the 1st% and the 2nd digit. If the transmission of the 1st digit is finished before all the pulses of the 2nd digit are received, the relays R 1710, R 1730 and R 1740 are actuated when the relay R 840 is energized, at the end of the 2nd digit, as it comes from 'being exposed. Accordingly, the circuit of the electro 957 is closed at 846, following the operation of the relay R 840.

   The electro 957, while working, brings the wipers 955 and 956 on their 2nd contacts, and in 957 b energizes the relay R 1720. This last relay, while functioning, initiates the release of the pulse counting relays, and relays R 1710, R 1730 and R 1740, as described previously. Following the release of these relays, the circuit of the electro 957 is opened in 1715 and 1743.



  Electro 957 therefore drops out, and de-energizes relay R 1720 in 957a. From this moment on, the way ± the pulses of the remaining digit are received, of which the pulses of the 2nd and 3rd digit are transmitted and whose transmitter is released, at the end of the transmission of the pulses, is exactly as explained previously. It should be noted that the relay R 900 drops out when the relay R 600 is released, to disconnect the conductor 665 from the earth.



  * As indicated previously, the necessary is done in the recorder-transmitter 19 so that the relay R 1760 can be commanded back during the transmission of the 1st

  <Desc / Clms Page number 64>

 digit or the 1st and 2nd digit, and the remaining digits transmitted to produce the operation of the following switches. A case where the two different types of pulses are required is shown by way of example in the arrangement shown for extending a link of group 15 through the 2nd reverse pulse selector 20 and the switch train 22 'for digit 4 to station D.

   In this case, relay R 1760 must be commanded back by the pulse relays of the selector part of group 15 during the transmission of the 1st digit, and by the pulse relays of the 2nd selector 20 during the transmission of the 2nd digit. The remaining four digits, however, are transmitted directly from the recorder-transmitter, without any control being exerted on the relay R 1760 by the set of switches 22 'through which the link is established. In order to effect the change from one pulse mode to another, terminal 6 of row 3, pin 12 is linked to terminal 1 of row 2, terminal 4 of row 4 is connected to terminal 2 of row 2 and terminal 4 of row 2 is joined to terminal 6 of row 1.

   The first of these connections provides a marking circuit through which the R 900 relay is controlled to indicate that the numerical value of the 2nd digit will determine the total number of digits to be received by the recorder-transmitter. connection is used to control the relay R 930, to indicate that the pulses of all digits following the 2nd must be transmitted directly, without a return command. The 3rd connection is used to control relay R 1010, to indicate to switches 950 and 1100 that a total of 6 digits will be received and retransmitted.



   Since with the assumed arrangements, the first two numbered digits to call station D are digits 6 and 4, relays R 1300 and R 1350 are actuated

  <Desc / Clms Page number 65>

 in the recording group n I at the end of the 1st digit, and relay R 1430 is actuated in the group n 2 at the end of the 2nd digit, to perform the functions assigned to it at the end of the first digit. When the R 750 relay drops out, at the end of the 2nd digit, it closes, in 751, the circuit of the R 1200 relay, which energizes the R 930 relay in 1204, according to: earth in 666, 1436, I204, the connection between row 4 terminal 4 and row 2 terminal 2, conductor 2 DP, 931, R winding 930 and battery.

   When operating, relay R 930 first maintains itself in 936 at driver 665; opens its actuation circuit in 931; it puts the conductor 962 to the ground, in 932 and in 936; it opens at 933 a point of a circuit for relay R 850; it prepares the R 1700 relay circuit in 934, and energizes the R 1010 relay in 935, depending on the earth in 665, 935, the conductor 2 DPM, the connection between terminal 4 of row 2 and terminal 6 of row I, the conductor 6 D, 1011, the winding of R 1010 and the battery.



   While operating, relay R 1010 is maintained first by 1015 to 665; it interrupts its actuation circuit in 1011; it grounds at 1012 and 1015, conductor 966, to indicate to switch 950 that six digits will be transmitted; it disconnects in 1013, the conductor 1076 from the earth, to indicate to the switch 1100 that six digits must be received, and it energizes in 1014 the relay R 840. The relay R 840 then performs the various functions described previously; From this moment on, the recording of the pulses of the 3rd digit and the following ones, as well as the transmission of the 2nd digit and following ones, takes place as described previously.

   After the 2nd digit is transmitted, the wipers of switch 950 are brought to their 3rd contacts; therefore, the R 1700 relay is energized, depending on

  <Desc / Clms Page number 66>

 the earth at 665, 936, 932, the conductor 962, the wiper 955 and its 3rd contact, 934, the conductor GP, the winding of R 1700 and the battery.



   While operating, the relay R 1700 is maintained by 1704 to the conductor 666; he interrupts the pulse circuit in 1702; it connects the OD conductor to earth in 1703, in 1755 to close a direct pulse transmission circuit; it grounds, in 1705 the starting conductor 1706, to produce the operation of the pulse generator 33, if it is not already in operation, and it connects in 1701 the relay R 1760, so it is controlled directly by the pulse generator 33, according to wire 1707, at the times when the relay R 1710 is attracted and the relays R 1600, R 1610, R 1620, R 1720 and R 1730 are de-energized. with the R 1700 and R 1710 relays attracted,

   the relays R 1760 and R 1750 intervene to repeat the earth pulse applied to the conductor 1707 by the pulse generator 33, via the conductor OP. Each time the conductor 1707 is connected to earth, the relay R 1760 is energized according to 1701, 1719, 1623, 1613, 1609, 1724, 1733 and 1754. Therefore, the relay R 1760 is maintained in 1762 at the conductor 1707. , and energizes the relay R 1750 in 1761. This relay disconnects in 1755 the conductor OP from the earth, and thus repeats the pulse at the conversation switch;

   he made count, in 1752, by the counting relays of fig. 16, the pulses emitted, as explained previously, and interrupts the circuit of relay R 1760 in 1754. When the pulse generator 33 disconnects the conductor 1707 from the earth, the relays R 1760 and R 1750 are successively de-energized. , and the latter again connects the OP conductor to earth, in 1755, thus completing the pulse. It will be seen that after all the pulses of a digit have been transmitted to the OP conductor, counted by the counting relays, the R 1730 relay is actuated and

  <Desc / Clms Page number 67>

 in 1733 prevents the R 1760 and R 1750 relays from responding to subsequent earth pulses transmitted on conductor 1707.

   During the two-digit interval, the circuit for transmitting ground pulses to relay R 1760 is held open at 1724, 1719, 1623, I6I3, or 1609.



   The way in which the 3rd, 4th, 5th and 6th digits are recorded and then retransmitted as direct pulses will be apparent from the previous discussion. After all six digits have been received and counted by switch 1100, relay R 820 drops out, indicating that there will be no further digits to receive. After six digits have been transmitted, the wipers of switch 950 are brought to their 7th contacts; therefore the R 850 relay is energized, depending on the earth at 665, 1015, 1012, the conductor 966, the wiper 955 and its 7th contact, the winding of R 850 and the battery. While operating, the relay R 850 brings about the release of the recorder-transmitter 19, and of the recorder selector, as explained previously.

   The R 930 and R 1010 relays are de-energized when the R 600 relay drops out, to disconnect the 665 conductor from the earth.



   If the layout of the network is such that in certain circumstances the R 1760 relay can only be commanded back during the transmission of the 1st digit, and all subsequent digits are transmitted directly, the possibility of actuating relay R 920 1 after receiving the pulses of the 2nd digit. To illustrate the utility of this arrangement, group 15 is shown as having access to a direct pulse 4-digit connector 21, through which connections can be made with a number of devices. stations, comprising station C. This connector is accessible to the selector part of group 15 via the 8th vertical row of contacts, and is arranged to absorb a received digit of nine pulses.

   Thus, to prolong a bond

  <Desc / Clms Page number 68>

 through group 15 and connector 21 to station C, for example, 5 digits comprising a 1st digit of eight pulses and a 2nd of nine pulses must be numbered.



  During the transmission of the 1st digit 8 by the recorder-transmitter 19, the relay R 1760 is controlled in return by the relay R 450 of the group. The 2nd, 3rd, 4th and 5th digits, however, must be transmitted directly to the relevant connector 21. In order to effect the required change in pulse mode, terminal 8 of row 3, fig. 12, is linked to terminal 1 of row 2; terminal 9 of row 4, which corresponds to the numerical value of the 2nd digit, is linked to terminal 3 of row 2; and terminal 5 of row 2 is connected to the terminal of row 1 which corresponds to the total number of digits, for example terminal 5.



   With the wiring mode just described, after the 1st digit 8 is numbered, the relay R 900 is attracted and prepares in 903 and 905 a circuit for the relays R 1200 and R 1210. After this digit is received, it is immediately transmitted to the selector part of the group. The 2nd digit 9 is stored in relay group 2, so that the relays R 1430 and R 1450 are drawn at the end of the digit. When the relay R 750 drops out, at the end of the 2nd digit, and energizes the relay R 1210, which closes a circuit for the relay R 920, according to the earth in 666, 1436 and 1214, the connection between terminal 9 of row 4 and row 2 terminal 3, conductor 1 DP, 921, R winding 920 and battery.

   While operating, relay R 920 is maintained first by 926 to conductor 665; it interrupts its actuation circuit at 921; it earths at 922 and 926, the conductor, 961, to prepare the circuit of relay R 1700; he then prepares, in 924, the circuit of relay R 1020, according to the earth in 665, 925, the conductor 1 DPM, the connection between terminal 5 of row 2 and terminal 5 of row 1, the conductor 5 D, 1021, the winding of R 1020 and the battery.

  <Desc / Clms Page number 69>

 



  The relay R 1020, while functioning, is maintained in 1025 to the conductor 665; it closes in 1022 and 1025 a marking circuit to indicate to the switch 950 that five digits are going to be transmitted; it opens in 1023 the marking circuit, to indicate to the switch 1100 that five digits must be received, and energizes in 1024 the relay R 840, which brings the wipers of the switch 950 to their 2nd contacts; therefore, the R 1700 relay is energized. When operating, the R 1700 relay again arranges the pulse circuit as described previously; so that feedback control of relay R 1760 is not required during transmission of the 2nd, 3rd, 4th and 5th digits, and the pulses of these digits are transmitted directly to connector 21.

   From this moment, the way in which the pulses of the three remaining digits are recorded in the recorder-transmitter, of which the pulses of the 2nd, 3rd, 4th and 5th digits are transmitted by this transmitter, and of which the transmitter d The pulse is released at the end of the transmission of the 5th digit, is exactly as explained in the above.



   Thus, the call number 89xxx is used to designate the station called C, and the second digit 9 is used to indicate the number of digits that will be received and the pulse mode used. This second digit cannot be used in any other call number in which the 2nd digit must give corresponding indications. For example, in the arrangement shown, it cannot be used in numbers having 6 as the first digit, since in this case it would cause the operation of the relay R 920, in addition to the relay R 930, and thus cause a premature transfer to the direct impulse.

   This second digit, which is transmitted, for example, to connector 21, is absorbed there, and the three remaining digits are used for the selection of the desired line, and of the call code

  <Desc / Clms Page number 70>

 or the desired frequency.



   In using the recorder-transmitter 19 to control the automatic switch operations required for establishing communications on the same shared line, the first numbered digit is used to inform the recorder-transmitter that communication is taking place. of the type indicated. This digit is used as a prefix to the call numbers which designate the extensions connected to shared subscriber lines, and is not used to control the operation of any of the automatic switches used to carry out the call. call the desired extension. With the wiring mode shown, the prefix digit 9 is arbitrarily chosen for communications on the same shared line, and thus terminal 9 of row 3, pin 12, is connected to terminal 10 of row I.



   Suppose that a communication intended for station 0 comes from station A, and that group 15, selector 16, connector 17, recorder selector 18, and recorder-transmitter 19 are used to establish the link. .



  After the prefix digit 9 is numbered, the R 1330 and R 1350 relays are actuated in relay group n I, and when the R 750 relay drops out, at the end of the digit, to energize the electro 957, the circuit of relay R 1230 is closed at 957 a * When operating, this relay closes the circuit of relay R 910, according to: earth at 666, 1336, 1234, the connection between terminal 9 of row 3 and terminal 10 of row 1, the RC driver, 911, the winding of R 910 and the battery.



   While operating, the R 910 relay first stays earthed at 915 through C 661; it opens its actuation circuit in 911; it closes in 912 and 915 a new circuit for relay R 1010; it prepares in 913 a new circuit for the relays R 1730 and R 1740, and energizes in 914 the relay R 860.

  <Desc / Clms Page number 71>

 



   The relay R 1010, while functioning, is maintained first, by 1015, at the conductor 665; it opens its actuation circuit in 1011; it connects conductor 966 in 1012 and 1015 to conductor 665, to indicate to switch 1100 that six digits will be received, and energizes relay R 840 in 1014.



   The relay R 860, while functioning, prepares in 861 the circuit of the relay R 640; opens at 862 a point in the ringback signal circuit; it prepares in 863 a circuit for transmitting the busy signal; in 864 he prepares a multiple holding circuit for the R 620 relay; he prepares in 866 a circuit to earth the conductor 36 c; it opens at 867 a point of another circuit for relay R 620, and it opens at 868 a point of the circuit through which the earth can be connected to the 6th contact of group 953.



   The relay R 840, while operating, is maintained at 849 'to the conductor 665; it then prepares the circuit for the busy signal; it de-energizes in 844 and 845 the electro 957, it makes the electro 957 in 846 controllable by the relay R 1740; it prepares at 843 the pulse circuit; it de-energizes the R I230 relay in 841, and makes the R 1720 relay in 842 controllable by electro 957.



   As a result of the operation of the electro 957, the wipers of the switch 950 are brought to their 1st contacts; therefore, a circuit is prepared by the trotter 956 for the relay R 1610. This circuit is closed at 613, in response to the successive operation of the relays R 800 and R 610, shortly after the wipers 955 and 956 are actuated. The relay R 1610 performs the functions described above, so that the relay R 1630 is then attracted, and in turn actuates the relay R 1710.

   The R 1710 relay de-energizes in 1718 ′ the R 610, R 1330 and R 1350 relays; it de-energizes in 1717 the relay R 1610, and closes in 1711 another circuit of the relays R 1730

  <Desc / Clms Page number 72>

 and R 1740. Being thus energized, relay R 1730 interrupts in 1733 the pulse circuit, to prevent this circuit from being closed in response to the release of relay R 1610.



   The relay R 1740, while working, is maintained in 1741, through 1712, to the conductor 666; in 1741 he opened another point of the relay circuit R 1710, and in 1743 energized the electro 957. The electro 957, while operating, brought the wipers 955 and 956 to their 2nd contacts, and energized in 957 a the relay R 1720. This relay, while functioning, is maintained in 1721, through 1712, to conductor 666; in 1722 it de-energizes the R 1710 relay; in 1723 it de-energizes the relay R 1630, and in 1724 opens another point of the pulse circuit. Relay R 1710, on falling, de-energizes electro 957 in 1715 and de-energizes relays R 1730 and R 1740 in 1712. When electro 957 drops out, it de-energizes in 957 at relay R 1720.

   After releasing this relay, the pulse emitting relays are completely switched off.



   Thus, when the relay R 910 is attracted, the pulse emitting relays of figs 16 and 17 are controlled so that the digit of the prefix is absorbed and is not retransmitted to carry out the control of a switch. From this moment, the way in which the next five digits are stored and the first four are then transmitted to control the operation of the selector part of group 15, of the 2nd selector 16 and of the connector 17, is exactly as previously explained. . When the relay R 860 is attracted, the circuit to ground the 6th contact of group 953 is kept open at 868, and can thus be closed at 812, when the relay R 810 operates, in response to the registration of the 6th digit in registration relay group 3.

   When this circuit is open, no circuit exists so that the relay R 1600 can produce the transmission to connector 21 of the 5th digit and thus the

  <Desc / Clms Page number 73>

 Pulse transmission from recorder-transmitter 19 is temporarily stopped, after four digits have been transmitted.



   After all six digits have been numbered, the relay R 820 drops out, as explained previously, and closes the circuit of the occupancy signal in 821, according to the generator of the occupancy signal of the equipment 32, the driver C 971 , 863, the capacitor 859, 847, 821, the capacitor 747, 621, the conductor 36 a, the wiper 557, 532, the conductor 35 a, 301, 222, 212, the negative wire to the calling station, the receiver from this station, the positive wire, 2II, 221, the winding of 335, and return to the generator of the busy signal.



   Relay R 820 also interrupts at 822 the dial signal circuit; it prepares in 823 the circuit of relay R 830; it opens in 824 the circuit bypassing the contacts of key 705; it opens at 825 a point of the circuit of relay R 750; it also interrupts at 826 one of the branches of its own holding circuit; it opens at 827 a point of the charging circuit of capacitor 748; it closes in 828 a circuit for the relay R 600, and prepares in 829 the earthing circuit of the conductor 36 c.



   When the busy signal is received, the calling subscriber hangs up his receiver; therefore, the calling looped circuit is interrupted, to cause the release of relay R 700, operation of relays R 740 and R 730, release of relay R 740, release of relay R 710, and finally releasing the R 730 relay, as described above. - Relay R 710, on falling, interrupts the normal circuit of relay R 600 at 712, applies a direct earth to conductors 36o and 35c at 713, from where it is transmitted to increase the excitation current of relay R 230 of the group 15. When it is thus fully energized, relay R 230 de-energizes relay R 220, remains attracted, closes a holding circuit

  <Desc / Clms Page number 74>

 for relay R 320, and applies a battery resistance to line wiper 471.

   Relay R 710 also follows, to earth, at 714, the 6th contact of group 953, thus energizing relay R 1600. When it is thus energized, relay R 1600 causes the transmission of the 6th digit to connector 17, d 'in a very obvious way. This number is used in connector 17 in order to operate the connector code or frequency selector switch, to select the call characteristic corresponding to the desired extension E. At the end of this number, l The control equipment of connector 17 is brought to its inrush position, to send the appropriate inrush current on line 10, thus signaling the station called E in the well known manner.

   After the 6th digit has been transmitted, the pulse transmitting relays in fig 17 operate to transmit a current pulse to the electro 957, which thereby brings the wipers 955 and 956 to their 7th contacts, and energizes in 957 has relay R 1720 and thus releases the pulse emitting relays, as explained previously. Following the release of these relays, the electro circuit is opened in 1715 and 1753 and when it falls back, it de-energizes in 957 a relay R 1720. When the 955 wiper reaches its 7th contact, the relay R 850 is energized.



   While operating, the R 850 relay maintains itself to earth at 854, according to 957 b; it again interrupts the pulse circuit at 851; it prepares again in 852 the circuit of relay R 640; it opens at 855 a point of the circuit of relay R 630; it prepares in 856 the circuit of the relay R 650; it opens at 858 a point of a holding circuit for relay R 620, and prepares at 857 another circuit for relay R 620. After the operation of relay R 850, no further operation of the relays of the relay takes place. 'recorder-transmitter, until called station 3 answers.

  <Desc / Clms Page number 75>

 



   When station E or another station on line 10 answers, the control equipment of connector 17 is automatically brought to its answered call position. As a result of this operation, the transmission on line 10 of the inrush current is interrupted, and the battery changeover relay of the connector is actuated, to connect the positive line conductor 22b to the negative terminal of the connector. the central unit battery. A circuit is then closed for the relay R 640, according to: the earth at 665, the winding of the relay R 640, 641, 861, 852, 843, the conductor 36 b, the wiper 556, 531, the conductor 35 b, 421, the wiper 470, the conductor 22b, the positive line wiper of the selector 16, the positive conductor of the line reaching the connector I?, The coil of the line relay and the battery.

   When so energized, relay R 640 first closes at 649 a hold circuit for itself; it interrupts its actuation circuit in 641, it grounds, in 649 ', the conductor 664, to produce the operation of the generator, if the latter is not already in operation, and closes in 642 a circuit for transmit a distinctive signal, via group 15, selector 16 and connector 17, to set E, to inform the answering set that the call comes from a set on the same shared line.

   This circuit includes 1 the signaling current generator, 0 761, the capacitor 703, 642, 861, 852, 843, the conductor 36 b, the wiper 556, 531, the conductor 35 b, 421 and the wiper 470, and of there, through selector 16, connector I? and from line 10 to the receiver of the answering station E.



   It is quite obvious that the ringing tones of the calling and called stations can be bayed so as to be supplied by the wires of different lines; in this case, the ringing of the calling station is not activated during the call period, and the calling subscriber is not informed when

  <Desc / Clms Page number 76>

 the called station answers. Thus the calling subscriber, after hanging up to activate the ringtone, waits a reasonable time and then resumes his receiver, to reestablish the connection with the line. If the called subscriber answers during this interval, the special signal informs the answering station that the call originates from a station on its own shared line.

   On the other hand, if the subscriber of the calling station picks up his receiver before the called subscriber has answered, the signal informs him that the call has not been answered, and he can either abandon the call. , or wait until he gets no answer.



   The R 640 relay also makes, in 644 and 645 ', the R 620 and R 630 relays controllable by the timing equipment 31, it opens in 646 and 648 a point of the actuation and holding circuits of the relay R 650, and prepare in 647 a holding circuit for relay R 630.



   The timing equipment 31 is provided with means making it possible to alternately transmit earth pulses on the conductors TA - 1 and TA - 2, at successive intervals. The first earth pulse transmitted on the TA - 1 conductor, after the operation of relay R 640, serves to energize the upper winding of relay R 630, according to 644, 632 and 604. E When operating, relay R 630 closes. first a hold circuit for itself, in 631; it interrupts its actuation circuit at 632 and then prepares the circuit for relay R 620.



   About two minutes after the operation of the relay R 630, the timing device 31 transmits an earth pulse on the conductor TA - 2, thereby energizing the upper winding of the relay R 620, according to 645 ', 634 and 623.



  While operating, the relay R 620 first maintains itself to the earth in 624 by 605; it interrupts its actuation circuit at 623; it opens at 622 another point of the individual circuit of relay R 500; it closes at 626 a multiple holding circuit for

  <Desc / Clms Page number 77>

 himself; it disconnects at 627 the conductors 36 c and 35 c from the earth in the recorder-transmitter 19, thereby causing the release of the recorder selector 18; it energizes electros 958 and 1108 at 628, which frees switches 950 and 1100, and frees relays R 800 and R 910 at 625. Relay R 910, when falling, de-energizes at 914 the re- lais R 860, which itself releases relay R 600.

   When R 600 drops out, the relays remaining attracted to the recorder-transmitter 19 return to their rest position.



   The timing equipment 31 is also arranged to transmit earth pulses to the conductors TR - I and TR - 2, at successive intervals. When the first earth pulse is transmitted to conductor TR - 1, after the operation of relay R 850, the lower winding of relay R 650 is energized, in a circuit comprising 856, 654 and 648, if the communication has not yet been answered, given that no circuit is closed for relay R 640 until this has taken place. While operating, relay R 650 is maintained first by 653 at driver 665, according to 646; it interrupts its actuation circuit at 654; it opens at 652 a holding circuit for relay R 630, and prepares the circuit for relay R 620 at 651.



   If the communication is answered, and therefore relay R 640 has operated during the interval between operation of relay R 650 and earthing of conductor TR - 2, relay R 656 is released. , and the delay takes place as explained previously. The relay R 640, while functioning, interrupts in 646 and 648 the actuation and holding circuits of the relay R 650, so that if the latter relay is attracted when the relay R 640 is energized, it drops out, and the timed release of recorder-transmitter 19 is transferred to relays R 620 and R 630.

   If, on the other hand, the communication has not been answered, the upper coil of relay R 620 is energized according to: 623,

  <Desc / Clms Page number 78>

 
633 and 651, when the timing device earths the TR - 2 conductor. Relay R 620 then releases the recorder-transmitter 19 and the recorder selector.
18, as explained above.



   As indicated previously, if the recorder-transmitter @ 19 is seized by a line in permanent call state, it is released by the timing device 31. This release is effected by relays R 630 and R 620 in response to earth pulses transmitted on conductors TP - 1 and TP - 2 at successive intervals *. After the intervention of the recorder-transmitter
19, the relays R 700, R 710, R 600 and R 820 are attracted. The upper winding of relay R 630 is energized according to: 604, 632, 643 and 855, in response to the 1st earth impulse transmitted on the TP - I 'conductor after the intervention of the recorder-transmitter
19.

   The R 630 relay is first maintained at 631 to earth, for
652, 752, 853 and 957b; it opens in 632 its actuation circuit, and prepares in 634 a circuit for the relay R 620 comprising the conductor TP 2. Thus, when the following earth pulse is transmitted to the conductor TP 2, the upper winding of the relay
R 620 is excited according to 705 a, 645, 634 and 623. The R 620 relay, while operating, maintains itself to the earth, at 624 and 626; it de-energizes relay R 800 at 625, and opens the calling looped circuit at 621, thus causing the successive release of relays R 700 and R 710. The latter relay, on falling, de-energizes relay R 600 at 712.

   As a result, all other relays attracted to the recorder. transmitter 19 and recorder selector 18 are released in a manner easily deduced from the preceding explanations.



   As indicated previously, a circuit comprising the conductor TP - 1 is provided for the energization of the upper winding of the relay R 630 during the interval between the moment of the intervention of the recorder-transmitter 19 and the operation. of relay R 850, to indicate that the transmission of the Pulses has ended. As a result, the R 630 relay can be energized and held one or more times during the dialing process and

  <Desc / Clms Page number 79>

 of the retransmission of the pulses.

   Since, however, the circuit for maintaining relay R 630 comprises contacts 752 and 957 b, the recorder-transmitter is not necessarily released, if the numbering continues at the normal rate, since each time the R 750 relay is attracted, at the start of a new digit, it de-energizes in 752, if it is attracted, the R 630 relay.



   If the dialing is abnormally delayed, or is abandoned after the formation of one or more digits, and the link is maintained by the calling station, the R 630 relay remains engaged until the transmission of the next earth pulse on conductor TP - 2. Relay R 620 is then energized by this pulse, and obligatorily releases transmitter recorder 19, recorder selector 18 and group 15, in the manner explained previously.



   Key 705 allows the central office attendant to control the speed with which the pulse emitting relays in fig. I6 'and 17 operate to empty the recorder-transmitter of the digits stored therein; for this purpose, the key is actuated so as to open the contact 705 a and close the contact 705 b. When the key 705 is actuated and an emission of pulses is in progress, the operation of the electro 957 normally prevents the relay R 630 from remaining attracted for an appreciable time. In the event, however, that there is an excessive delay in transmission, relay R 630 would remain attracted.

   When the next earth pulse is transmitted to conductor TP 2, relay R 830 is energized, according to circuit 1 conductor TP - 2, 705 b, 823, 832, resistor 834, upper winding of relay R 830, 645, 634 , 623, top winding of R 620 and battery.



  This circuit is kept open at 823, and a direct circuit is prepared for the top winding of relay R 620, at 824, until relay R 820 is de-energized, to indicate that all digits have been numbered. Thus relay R 830 is prevented from functioning to produce an alarm signal, if the

  <Desc / Clms Page number 80>

 operation of relay R 630 is caused by a delay in dialing.



   Due to the relatively high resistance of relay R 830, relay R 620 is not sufficiently energized, and is not attracted when the above circuit is closed. Relay R 830 nevertheless is attracted, and closes at 833 a holding circuit for itself, according to 957 b, 853 and 833; it interrupts in 832 the circuit of its upper winding and of the relay R 620, and lights in 831 the alarm lamp 834, thus indicating by a visual signal that the recorder-transmitter 19 is not in working order.

   If the transmission of the stored digits takes place after the operation of relay R 830, this relay and relay R 630 are both de-energized when the electro 957 is operating, since the holding circuit of relay R 830 has contacts $ 957 b of electro 957. On the other hand, if the relay R 830 remains engaged, the actuated switches, including the transmitter recorder 19 can only be released by the calling subscriber or an operator who returns the key 705 to the rest position. If the call is abandoned by the calling subscriber, the release of the transceiver and other activated switches is effected as previously indicated.

   If a switchboard attendant notices that the signal lamp 824 comes on and returns the key 705 to the rest position, the activated switches are released, under the control of the timing equipment 31. When the key is returned to rest position, the contacts 705 a are closed, to prepare again the circuit including the conductor TP - 2, to energize the relay R 620 directly. As a result, when the next earth pulse is transmitted, the relay R 620 is energized and caused to release the recorder-transmitter 19 and the various actuated switches, in the manner previously described.


    

Claims (1)

CLAIMS EMI81.1 ¯¯ ------ ¯-¯ ---------------- I) Recorder-transmitter for telephone reeds) designed to be activated in accordance with a requested number, and to perform the corresponding actuation of automatic switches, by exerting control actions which may be of two different types. 2) Recorder-transmitter for telephone networks in which the desired number is received in the form of pulses which are all of the same type, and which can be retransmitted in two different forms, depending on the value of the pulses received. , 3) Recorder-transmitter for telephone networks in which the desired number is received in the form of pulses comprising grouped interrupts in a looped circuit, and in which numerically equivalent pulses are subsequently retransmitted, the device being such as according to the value of the received pulses, transmitted pulses are either similar to those received, and then actuate automatic switches, which could have been actuated by the original pulses, or actuate automatic switches provided for the feedback control. 4) Recorder-transmitter for telephone networks, in which a device is provided which takes a position corresponding to the number of digits of the complete number, in response to the first digit or to the digits of the desired number. 5) Recorder-transmitter for telephone networks, to control the establishment of communications between stations on the same shared line, in which the impulses intended to choose the call ringtone corresponding to the called station @ are not transmitted by the 'recorder-transmitter only when the calling subscriber hangs up, to produce the call. 6) Recorder-transmitter for telephone networks, to control the establishment of communications between stations on the same shared line, in which, after the subscriber calls <Desc / Clms Page number 82> After hanging up to make the call, the recorder-transmitter remains associated with the established link, and is used to control the transmission of a distinctive acoustic signal to the answering station, to indicate the nature of the communication. 7) Recorder-transmitter for telephone networks, intended to control the establishment of communications between stations of the same shared line, in which a device, actuated in response to a determined prefix digit, modifies the operation. normal, so that the recorder-transmitter is not released when all digits of the number have been retransmitted, as is the case with normal communication. 8) Recorder-transmitter according to claim 1, in which devices are provided for switching from one to the other type of control actions during the establishment of a communication. 9) Recorder-transmitter according to claim 1, wherein the type of control action which is used changes automatically depending on the type of switch to be actuated. 10) Recorder-transmitter according to claim 1, wherein the type of control action to be exercised is controlled via a calling line. II) Recorder-transmitter according to claim I, wherein the type of control action to be exercised depends on the value of one or more digits. 12) Recorder-transmitter according to claim I, the actuation of which is effected by pulses all of the same type, while the two types of control action can be exerted on the automatic switches for the establishment of the link. 13) Recorder-transmitter according to claim II, wherein, if the first digit received has a predetermined value, circuit changes take place, thanks to which the type of control action exerted on the automatic switches. <Desc / Clms Page number 83> ques is made dependent on the value of the 2nd digit. 11 +) Recorder-transmitter according to claims 8 and 9, in which the arrangements made to change the type of control actions exerted on the automatic switches are controlled by a switch designed to count the transmitted digits. 15) Recorder-transmitter according to claim 3, wherein a relay, provided to be actuated by feedback pulses from a switch actuated by feedback command, is also provided to be actuated by a generator. pulses associated with the recorder-transmitter, when the actuation of a switch by direct pulses is performed. 16) Recorder-transmitter according to claim 4, characterized in that it is automatically released when the number of digits announced by the first digit or digits of the call number have been transmitted. 17) Recorder-transmitter according to claims 4 and 16, in which, when the number of digits announced by the first digit (s) have been received, the recording equipment is isolated, so that other digits do not can no longer be received. 18) Recorder-transmitter according to claims 1 to 4, characterized by means for transmitting a distinctive acoustic signal when the numbering is completed, to indicate that the recorder is operating normally. 19) Recorder-transmitter according to claims 5 and 6, wherein a communication between stations of the same shared line is indicated by the numbering of a particular prefix number, which is used to perform the appropriate switching in the recorder. transmitter. 20) Recorder-transmitter according to claims 7 and 19, wherein the number which is used to indicate <Desc / Clms Page number 84> that it is a communication between posting of a same shared line 'is not retransmitted by him. 21) Recorder-transmitter according to claims 5 to 7, wherein, after the n is completely completed and the equipment is prepared to initiate the call, a signal - distinctive is given to the calling station to notify him to hang up. 22) 'Recorder-transmitter according to claims 19 and 20, which is kept actuated for a determined time. after the call is answered, on receipt of the prefix digit, in the case of a communication between stations of a shared line, during which time a distinctive acoustic signal is given to the responding station. 23) Recorder-transmitter according to claim 22, wherein a separate timing device is provided for the release of the recorder-transmitter, if it is not answered after a determined time. 24) Recorder-transmitter for telephone network, corresponding substantially to the previous description and to the figures which accompany it.