US2207519A - Telephone system - Google Patents

Telephone system Download PDF

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Publication number
US2207519A
US2207519A US152552A US15255237A US2207519A US 2207519 A US2207519 A US 2207519A US 152552 A US152552 A US 152552A US 15255237 A US15255237 A US 15255237A US 2207519 A US2207519 A US 2207519A
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Prior art keywords
relay
contact
over
register
impulses
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US152552A
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English (en)
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Pfannschmidt Rudolf
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Siemens and Halske AG
Siemens Corp
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Siemens Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Definitions

  • the present invention relates to a circuit arrangement for telephone systems with registers. It concerns the arrangement of a register in a telephone system having a plurality of exchanges and concerns the particular construction of the register, which is provided with various approaches, the mode of operation of the register being adapted to various requirements in accordance with the characterization of these approaches on the establishment of a call between the various exchanges.
  • the register itself is provided with devices which enable an impulse train transmitted to the register to be used for transmitting separate signals which do not serve for setting switches. A complete suppression of the impulse train can take place instead of the transmission of a signal.
  • a further characteristic of the invention consists in that the register transmits ready impulses before receiving individual impulse trains in accordance with the manner in which the approaches are characterized. Moreover, by characterizing particular approaches the assessing device can be set out of action. When the assessing device is used the mode of transmission of ready impulses can be different.
  • This register is connected up on incoming calls in that, for example, in the case of calls over one of the lines Bi to B8, one of the secondary switches M46 is set on the connecting repeater Ue.
  • the secondary switch is set by the transmission of an A. C. seizing impulse.
  • the connecting repeaterUe possesses a plurality of approaches some of which i are reached by the switches l l-M and others by the switches l5 and it.
  • special lamp may be connected up in order, for example, to indicate to an operator when a call has been set up from a particular direction and that she must listen in to this call. It is not necessary for the digits 1 and 2 to be used for differentation. Naturally any digits could be used.
  • the register is set in readiness for five impulse trains of which the third is used for transmitting special signals.
  • the manner of transmitting '5 revertive impulses when the receiving switches of the register are in the ready condition is different from the case when the register is seized over the switches I
  • the third impulse train is used in this case in the same way as in the case in which the register is taken into use over the switches l l-l4.
  • a call is to be set up over the line La. Lb the seizing impulse for initiating the call is transmitted by alternating current.
  • This alternating current is transmitted to relay MR1 by the transformer UcI.
  • a rectifier GL is arranged in parallel with relay MRI.
  • Relay MRI operates its contacts Zmrl and 3mrl.
  • Contact 2mrl opens a point in the circuit for relay MU.
  • Contact 37ml energizes relay MR in the following circuit: earth, contact 31ml, MR, battery and earth.
  • Contact 41211" applies battery to the rotary magnet MD over contacts 41m", l5mm, l8mz and IZmt so that the magnet is impulsively operated by the interrupter UnI.
  • a connecting switch DW having an associated rotary magnet WD.
  • This magnet operates wipers aw, awl, cw, cwI, cw2, dw and ew.
  • the magnet WD possesses a contact wd which is only operated when the magnet WD is energized.
  • relay MT If when a call is initiated the switch MW does not find a free outgoing line it advances into In this position relay MT operates since it finds battery over contacts Smr and Ifimw, and resistance W2'2. Relay MT brings the switch to rest by way of contact I2mt. At the end of the transmission of alternating current relays MRI and MR release. When contact Bmr is open relay MX energizes. Relay MX operates its contacts [5mm to I'Imzc. Contact IEmr opens the circuit of magnet MD. Contact IGmx connects up earth in preparation. Contact IImr is opened. If now a seizing impulse is again transmitted over the line La, Lb relays MRI and MR energize again. Hereupon relay MX is held energized by the closing of contact Bmr over earth, contact IGmx, relay MX, resistance Wit, battery and earth while relay MT is short-circuited by the earth connected to contact Ifimx.
  • Relay MT consequently releases and closes
  • relays MR and MRI also release.
  • relay MX releases the rotary magnet MD receives the impulse occasioned by the closing of contact I5mx whereby the switch is advanced to position 0. From this position it can then be started up by the transmission of a fresh alternatin current impulse over the line La, Lb in the manner already described. Successive transmission of alternating current seizing impulses can proceed for a definite time and only after the expiry of this period is a busy signal transmitted to the calling station.
  • the automatic transmission is brought to an end by an alternating current impulse sent back when a free register is prepared.
  • the other contacts of relay K have been opened or closed or switched over without provoking any special switching operations.
  • the contacts 29c to 33c are operated by the energizing of relay C when the alternating current repeater was seized.
  • Contact 290 connects up winding I to relay C "in preparation.
  • Contact 32c prepares a testing circult for the connecting switch DW for connecting a free register.
  • Over contact 'lflq contact 330 connects winding I of relay B to the ter minal Ad which is connected to the terminal ad.
  • Relay B is energized on the closing of contact 330 by the earth connected to wiper dm.
  • Relay MU does not energize since being in series with winding I of relay B it does not receive sufiicient current.
  • Relay B operates contacts 34b to 38b.
  • Contact 3% brings about the energizing of relay E over earth, battery, resistance Will, relay E, contacts 68g, 34b and 300 and earth.
  • Contact 355 prepares a locking circuit for winding II of relay B which, however, only becomes effective after relay Q has operated.
  • Contact tfib prepares a locking circuit for the register.
  • Contact 31b opens a point in the circuit of the lamp AL.
  • Contact 3% in the lead Ld is closed.
  • Relay E locks up at contact 39c.
  • Contact Me switches on winding I of relay C.
  • Contact Me shortcircuits winding II of relay Cl.
  • Contact (3e short-circuits winding I of relay K which releases.
  • Contact Me connects up lead La.2 for the outgoing impulse transmission.
  • Relay S (winding II) is energized in the following circuit: earth, contacts 28k, Me, 52p, and 6911, wd, winding II of relay S, battery and earth.
  • Relay S operates contacts 558 to 493.
  • Contact 418 short-circuits the thermo-relay Th.
  • Contact 488 prepares'ior the energizing of winding III of relay S.
  • Contact 498 causes the earth connected up at 28k to be connected to the rotary magnet WD. This latter energizes and operates contact wd.
  • relay S (winding II) releases.
  • Contact 49s disconnects the magnet WD.
  • the contact wrl on releasing reenergizes winding II of relay S.
  • relay P When relay P operates it actuates contacts 5 p to 54p and Illllp.
  • Contact 50p by applying earth directly over contacts 320, 3610 and 50p to winding I of relay P guards the seized register.
  • Contact Sip connects winding II of relay U to wiper aw.
  • Contact 52p brings the switch DW to rest by breaking the stepping circuit of the rotary magnet WD.
  • Contact 531) breaks the lead Lb nowadays and contact 5411 switches through the lead Ld.
  • Contact lilll'p connects the lead Li serving as an impulse lead for the outgoing impulses to lead LaZ. In the register relay RC has been energized.
  • Relay RC prepares the register for the reception of impulses and transmits a signal to the alternating current repeater over contact l35rc by applying earth to the lead Ld to indicate that the register is ready to receive impulses.
  • the earth applied at contact l35rc energizes relay R in the alternating current repeater in the following circuit: earth, contacts l35rc. lMrv, 532.4, wiper 2014, approach Sd, wiper dw, contacts 55p, 3822, Isle, thermo-relay Th, contact 15h, relay R, resistance Wz'9, battery and earth.
  • Relay R energizes and operates its contacts EST and 561". Contact 551* energizes relay R! which is a slow-acting relay.
  • Contact 56 connects relay Q to the earthed lead Ld.
  • Relay Q energizes.
  • relay RI energizes contacts 511! to 58H are operated.
  • Contacts 5'! and 581'! connect the alternating current source We to the speaking leads sothat the alternating current is transmitted over the repeater Uel tothe line La, Lb.
  • Contact 59 nowadays connects relay T to the earthed lead Ld by way of contact IBIe.
  • Relay T energizes and operates contacts 6015 to Biit.
  • Contact Ellt short-circuits resistance Wi l. This, however, does not produce any switching operation.
  • Contact 6It holds relay T energized independently of contact 5911.
  • Contacts 621i and 631' open the speaking leads. The switching over of contacts 6H does not promote any switching operation.
  • Contact 6515 short-circuits relay R.
  • Relay R releases and thereupon relay Ri makes a delayed release.
  • Relay Q does not release since contact B'lq has been closed and a locking circuit has been established to the earth connected over contact 3Ic.
  • Winding II of relay B is also held by this earth when winding I of relay B deenergizes through the opening ofcontact 'Hlq.
  • On the release of relay RI the transmission of alternating current to the calling station is terminated.
  • Contact 6911 breaks the circuit for winding II of relay S.
  • Contact 99 closes in preparation the circuit for the alarm lamp AL.
  • the transmission of alternating current from the source We indicates to the calling station that impulses may be transmitted to the register.
  • This transmission of alternating current when a plurality of calling impulses are transmitted can bring about the termination of the transmission of the calling signal as previously de scribed.
  • the manner in which this alternating current is transmitted to the calling station and the equipment at the calling station does not concern the present invention.
  • thermo-relay Th After the application of the ready signal by the register to the lead Ld the thermo-relay Th heats up and thus supervises the orderly procedure of the call.
  • Relay H controls contacts 12h.
  • Contact 12h is closed wthout controlling any special circuits.
  • Contact 13h connects the earth at contact 300 to relay T (I) over contacts 341) and 68g throughout the impulse transmission so that this remains operated even in the event of the earth. at contact i351'c being disconnected during the impulsing.
  • Contact 14h short-circuits relay E intermittently without, however, causingfit to release.
  • Contact 75h intermittently breaks the heating circuit for relay Th.
  • Contact 16h repeats the incoming impulses to the register. This impulse circuit is completed from earth at wiper ew over contacts 76h and Elp, wiper aw, approach Set and contact 811m to relay A, battery and earth in the register.
  • Relay Th by switching over its contacts Tith energizes winding III of relay S in the following circuit: earth, battery, HIS, contact 11th, lead Lcl, contact 38b, contact 56p, wiper dw Sd, 2:54, 52. 5, 44m, l351'c, and earth.
  • Relay S operates its contacts and locks up at 48s over contacts 66g and 21k and the lead Ld.
  • relay B is prevented from being short-circuited on the release of relay Th in the case of particular calls in that when impulses are transmitted to the register contact i t lrv is open and the earth applied at contact 5351c cannot become operative to short-circuit relay B. This case only occurs when the register has been taken into use over the approaches Scl or S02 as will be described later.
  • Relay RC On taking the register into use over the approach so relay RC was energized over winding II as previously described.
  • Relay RC operates contacts I03 TC, lfi lrc, l21rc, l3lrc, 5357c, and Il2rc.
  • Contact liln'c switched on winding I of relay RC in the testing circuit. Contacts were and [Tire are switched over without promoting any particular switching operation.
  • Contact l3lrc short circuits winding I of relay Y.
  • Contact lrc earths the approach Sd.
  • Contact llErc applies earth to winding I of relay RR.
  • Relay RR energizes and operates contacts 88m, lBSrr, l32rr, H3317", and H5317".
  • Vfhen now impulses are passed into the register, i. e., when relay A is impulsively operated contacts l23a, [250a, l36a, MM and lGla are switched over by relay A.
  • Contact l23d sets up the following circuit for the rotary magnet Dl of the first register switch DI; earth, battery, rotary magnet Dl, contacts [691, H532, l2l.3, i22.:l, 123a, l2 irq and earth.
  • Magnet D! is operated and advances the wipers ldl, 2d! and 3dl one step.
  • the rotary magnet Dl on energizing operates contact idl.
  • the opening of contact l25a does not promote any switching operation.
  • Contacts 136a and MSa are opened. These also do not promote any switching operation. Contact liila is closed and energizes relay RV. Relay RV is a slow-to-release relay and remains operated throughout the incoming impulse trains. Relay RV operates contacts 8612), 126M, [31m]. Marc and 391m. The opening of contact M lrv does" not cause any switching because the earth applied to contact l35rc remains connected up over the closed contact 145ml.
  • relay A When the first impulse is terminated relay A releases. Its contacts are accordingly restored to normal.
  • the rotary magnet DI is deenergized by the opening of contact l23a.
  • the operation of the other contacts of relay A do not result in any switching.
  • the wipers of the switch D! now rest in position I. No special switching operations take place in this position.
  • relay A receives the next impulse of the first impulse train it energizes again so that the magnet DI is energized again over contact 123a. This switches the wipers of the switch DI into position 2.
  • the next impulse advances the switch to position 3. If this is the last impulse of the first impulse train relay A is deenergized for a prolonged period so that relay RV releases.
  • relay I winding 2
  • Relay I operates its contacts IBM, 191, i381, l39.l, IBM.
  • Contact I381 breaks the energizing circuit for winding 12' of relay I. It does not release, however, because contact 39.! sets up a locking circuit.
  • Contact lfl9.l is switched over and connects the rotary magnet of the switch D2 to the control lead for incoming impulses.
  • Contact 31.! temporarily connects the rotary magnet Di to the control circuit for outgoing impulses.
  • Contact IBM is opened.
  • Relay RV causes relay II to energize over winding b over contact l3'lrv in the following circuit: earth, contacts I35rc, l38a, IS'h-v, I402, wiper 2d2, contact 4 in the bank associated with this wiper, winding 1) of relay II, battery, earth.
  • Relay II energizes and operates its contacts. At contact i402 winding b of relay II is disconnected from contact l3'hv. Relay 11 does not release, however, since contact MLZ sets up a locking circuit.
  • Contact 18.2 connects magnet D2 to the outgoing control circuit in preparation.
  • Contact 0.2 connects the control circuit for the outgoing impulsingto relay X. Contact i512 is opened.
  • Contact I522 is closed and establishes the following circuit for winding '11 of relay Y: earth, contacts 152.2 and ddl, wiper 3d! in position 3, contact 158171, winding II of relay Y, battery and earth.
  • Relay Y energizes and operates its contacts. The operation of relay Y initiates the transmission of the impulse train registered in the switch DI. The transmission can take place while incoming impulses are being received.
  • the third impulse train sent by the calling station may comprise either one or two impulses. If only one impulse is transmitted as the third IIZrk, IltrcI, relay X, battery earth.
  • Relay RV' is energized over contact "31a.
  • Relay X operates its contacts H402, Il5zc, 6a: and Idfix.
  • Contact il lzc removes a short-circuit about winding I of relay RM.
  • the closing of contact I462 has no significance at present. Through the closing of contact I25a.
  • relay RK At the end of the impulse train relay RK is energized and relay X is held energized in the following circuit: earth, contacts Iz lrq, I25a, contacts I26ro of the slow release relay RV which has not yet released, contact IIIrm contact IIfizc, winding I of relay RK, relay X, battery, earth.
  • Relay RK operates contacts Eric and IBBTk. Contact II2rk is switched over but does not bring about any switching operations. Contact IIBrk holds relay RK energized over its winding II and I I2rc.
  • the switch D3 When the calling station transmits the fourth impulse train, for example the digit 5, the switch D3 is advanced five steps.
  • the magnet D3 is energized over: earth, I24rq, I23a, I22.4, I2I.3, IIBLP, iIZrIc, IIEsc, ll8rm, rotary magnet D3,-battery and earth. While the rotary magnet D3 is being energized relay RV energizes again.
  • the switch D3 steps its wiper Id3, M3 and M3 into position 5.
  • Relay III energizes in the same Way as did relays I and II at the end of the impulse train.
  • the magnet D4 is energized over the following circuit: earth, contact I24r2, I23a, I22.4, Hit of the control relay III which has energized meanwhile over winding b, magnet D4, battery and earth.
  • the magnet D4 steps its wipers Idd to 3% into position 6. On the first step itself over contact I561.
  • Relay RQ is deener gized through the opening of contact IIUA.
  • Contact Iiillrq which opens is shunted by contact IBM which closes.
  • the magnet DI advances its wipers. Contact I32rr clamps the winding I of relay Y by connecting up resistance Will. Contact 83nc'auses an impulse to be transmitted over the lead Li.
  • contact 40 opens.
  • Relay Y (winding II) consequently releases.
  • relay Y closes contact I Hy and relay RR (winding I) energizes again.
  • Relay RR opens contact 88m" and 3671:.
  • the opening of contact 8377 terminates the first outgoing impulse.
  • the DI is deenergized. Accordingly contact 40 is closed again so that relay Y (winding II) again energizes over winding Iin position 4.
  • Relay Y again causes relay RR to release whereby an impulse is tranmitted to the rotary magnet and a further impulse? is sent out over the lead Li.
  • the interaction between relay ,Y and relay RR continues until the wiper MI of the switch DI reaches position II. In this position the circuit for energizing relay Y over winding II so that relay Y remains deenergized for a prolonged period.
  • relay RVI is caused to release.
  • Relay RV2 thereupon deenergizes for its circuit is broken at contact IIiEvI and contact I6Ilrv2 isclosed on the deenergizing of relay RVZ.
  • a circuit is set up for windings I and II of relay RH.
  • This circuit runs over: earth, battery, windings II and I. of relay RH, contact IISilroZ, position 11 of the wiper 3dl, contact ddI, I522 and earth.
  • Relay RH operates its contacts and sets up a locking circuit foritself over its winding II and contact 15cm.
  • Contact ream removes the damping from winding I of relay Y.
  • Contact I62rh opens'a point in the circuit over relay RVI.
  • Contact 951% breaks the circuit over which the impulses are transmitted, to a succeeding device on the advancing of the switch DI from position 3 to position II.
  • Contact Ifiiirh switches on winding II of 'relay Y and the closure of contact I34y causes RR to release.
  • the magnet DI receives an impulse over contact Ifilirr which brings the wipers of this magnet into position I).
  • Relay RVI does not energize since contact M3271, is opened.
  • -In position II of the switch DI the circuit for winding 12 of relay I is broken so that this relay also releases In consequence the magnet D2 is con nected to the stepping circuit at contact IU'LI.
  • wiper 30 is set in position 9 the circuit for relay Y (winding II) is broken.
  • Relay RH makes a delayed release. Meanwhile relay Y is released so that relay RR (winding I) is'energized again over contact I'Ily. Eight impulses are transmitted.
  • the transmission of the second impulse train is initiated by the energizing of relay Y, winding II.
  • This energizing circuit is as follows: earth, I5Irq, 4dI, 3dl, I531'q and 4d2, wiper 3d2 in position 4, I 581k, winding II of relay Y, battery and earth.
  • Relay Y energizes and by opening contact I'IIy deenergizes relay RR.
  • Relay RR energizes the rotary magnet DZ over contacts I061'1', I0I.I and I082.
  • the switch D2 steps its wipers to position 5 whereby relay Y deenergizes through the opening of contact 4d2.
  • Relay RR is consequently reenergized.
  • Contact IIISTT is opened.
  • the next step of the switch is initiated by the energizing of relay Y (winding II) when the contact 4d2 of the magnet D2 is closed.
  • Relay Y allows relay RR to release again whereupon another impulse is transmitted over contact 88W, the magnet D2 being advanced at the same time.
  • the stepping and transmission of impulses continues until the switch D2 reaches position I I. In this position relay Y remains deenergized for a prolonged period.
  • Relay RR is energized and contact 38m is open.
  • contact I BEIroZ closes relay RH energizes.
  • Relay RH opens contact 99m so that the release of relay RR when the switch D2 is advanced from position II to position Q does not result in an impulse being transmitted by contact 8817.
  • contact IEBrh is switched over relay Y energizes again.
  • Relay RR releases and the magnet D2 receives an impulse over contact IIIorr which advances the wipers to position 0. In this position winding b of relay II is deenergized. Accordingly, the lead controlled by contact IIISTT is connected to the magnet D3 over contact I082.
  • Relay Y (winding II) energizes after the release of relay RH which takes place when wiper M2 is set in position I] over. the following circuit: earth, contact I5Irq, 4dI, 3dl, I53rq, 4(12, I55rq, 4d3, wiper M3 in position 5, contact I 5am, relay Y, battery and earth.
  • Relay Y energizes relay RVI over contact I63y and this energizes relay RVZ over contact I65rol.
  • Relay RR releases.
  • the magnet D3 receives current over earth, contacts I Mrc, IDBrr, I0'I.I, I082, I I9.3, rotary magnet D3, battery and earth, Magnet D3 advances the wipers from position 5 to position 6.
  • Relay RH energizes over contact IfiilrvZ whereupon the switch D3 is advanced to position (I by the energizing of winding II of relay Y after contact I58rh has been switched over. No impulse is transmitted at this step. The damping of winding I of relay Y is removed at contact I3Ilrh. At contact II of wiper M3 the circuit for relay RH is broken.
  • Relay III is deenergized when wiper 2113 is set in position I).
  • the stepping of switch D4 to position II and the transmission of impulses over contact 8811' takes place in the same way as in the case of the stepping of switches DI to D3.
  • relay F energizes over winding I.
  • Contact I02 opens and causes relay RC to release.
  • the following circuit is set up for winding I of relay Y: earth, contact I23 IZQT'Ul, 30m, winding I of relay Y, resistance Wil2, battery and earth.
  • Relay Y energizes and operates the rotary magnet D4 over earth, contacts I d4 overwinding 0, until the switch D4 reaches the position 8.
  • contact I02 opens not only is relay RC deenergized, but also relay P, whereupon the irnpulsing lead L2 is disconnected through the restorationof contact IBUp to nor mal.
  • Relay RR does not release during the stepping of the switch D4 from position II to position 0, since a locking circuit has been set up for its winding II over contacts I28 (relay F is energized in position II of the switch) and I 3377'. gized contact 3877' is kept open so that no im pulse is transmitted over the lead Li even if contact lIlflprernains open for a long time.
  • the release of relay P in the switch DW brings about the release of the register so that after relays F and RR have released the register may again be seized for the establishment of further calls.
  • the station which has been selected is now called in any known manner.
  • This connection of battery causes relay Z to energize over its winding II in the following circuit: earth, contact 8Iz, winding II of relay Z, choke-coil Dr2, contact 5371, lead Lb2, battery and earth in the device which is not shown.
  • Relay Z energizes and locks up over earth, battery, resistance Wi5, contact 84a, winding I of relay Z, contacts 6Iq and 3Io and earth.
  • Contact 8Iz opensso that the earth connected to the chokecoil D1'2 over winding II of relay Z is disconnected.
  • relay RI Through the energizing of relay RI
  • relay RR being held ener- Eli n e (A) alternating current from the source We was connected to contacts 51M and 5814, this resulting in the transmission of alternating current over the line La/Lh for signalling the fact that the called station has replied.
  • relay T When relay T energizes contact 6513 short-circuits relay R.
  • Relay R releases and by opening contact 551 brings down relay RI.
  • Relay Ri restores its contacts to normal, thereby terminating the transmission of alternating current over the line La/Lb.
  • relay R releases relay K energizes over winding II before relay T has released.
  • the circuit passes from earth to battery, resistance W25, contact 84.2, winding II of relay K, the closed contact 6 32?, back contact 5dr, contact Blq and contact Me to earth.
  • Relay K locks up at contact 2570.
  • the current over the approach'Cd is amplified in that when relay K energizes the following circuit is established: earth, battery, winding II of relay C, contacts Gilt, 45s, and 23k, resistance W213, approach Cd, contact col, wiper cm, of the secondary switch MW, lead Lc, wind- II of relay MT, Winding I ofjrelay MZ, contact mi and earth.
  • relay MZ energizes over winding I and operates its contacts.
  • relay MZ locks upover winding II in the circuit: earth, contact I lmt, windings I and II of relay MZ, contact Zlmz, resistance Wi2, battery and earth.
  • contact 2lmz relay MZ connects the interrupter UNZ to the meter ZB. This circuit passes from earth, interrupter UNZ, contacts Hmw, Zlimz, and 2011211. to the meter ZB, battery and earth. By the operation of the interrupter the fee to be charged for this call is determined while the conversation is in progress. The current strength over L0 is reduced again on the release of relay T through the opening of contact 661.. When the called subscriber replaces his receiver in order to release the call or if he gives the clearing signal in any other way potential is applied to lead LL12. Accordingly relay S is energized over winding I.
  • Relay T (I) is energized over contact 5911, whereupon relay R is short-circuited over contact Eat. Relays R and RI release. Relay T, however, holds up over contacts Git, i352, 46s, etc, 350 and earth. The alternating current impulse sent back-over the leads La. and Lb causes a prolonged release impulse to be transc mitted from the preceding devices to relay J.
  • magnet MD of the switch MW earth, interrupter Uni, magnet MD, contacts iZmt, lflme, 15mm, the bank associated with wiper em, battery and earth.
  • the magnet MD receives impulses until wiper em has reached position ll.
  • relay MZ contact Zllmz is also opened thereby terminating the influencing of the meter ZB.
  • a test during further stepping of the wipers of switch MW into position ll does not take place because contacts Hmt and tmr are open.
  • relay C in the switch MW releases relays B, Q, Z and K are deenergized during the opening of contact 3Ic.
  • winding II of relay RM is held energized in series with the magnet D3 (which does not energize) during the closing of contact 525a for a definite time.
  • This circuit passes from earth at contact l24rq over contacts l25c, I 26m, and HBrm, winding II of relay RM, magnet D3, battery and earth.
  • Relay X releases.
  • Relay RM remains energized for some time after the release of relay RV and the opening of contact l261v because its winding I is short-circuited at contact 41:.
  • the following circuit is set up for winding II of relay U: earth, contact 35rm, back contact 86w, wiper aw, contacts 51p and 16h, winding II of relay U, battery and earth.
  • Relay U energizes.
  • Relay RM releases.
  • the energizing of relay U over winding II causes relay MU in the switch MW to energize by closing contact 8011..
  • a locking circuit is set up for winding I of relay U at contact 8011. This circuit passes from earth over contact Zmrl, relay MU, lllmt, dm, ad, Ad, 8%, IU, battery and earth.
  • the energizing of wind ing II of relay U is brought to an end by the opening of contact rm.
  • Relay MU connects up the metering switch ZA in preparation at contact 22mu and this metering switch is operated in place of the metering switch ZB when the i call is established and relay MZ operates.
  • the further establishment of the call proceeds in the same way as that described in connection with the first embodiment in that the impulse trains following the third impulse train are transmitted by relay A to the switches D3 and D4.
  • the circuit for energizing magnet D3 passes over earth, contacts l241'q, l23a, 122.4, l2l.3, [10.2, I lZrk, H53: and ll8rm, magnet D3, battery and earth.
  • a stepping switch or a similarly constructed relay switch could be used, the transmission of particular signals then being made dependent upon more and larger digits.
  • the evaluating device which in the present example comprises relays RM, RK, and X remains inoperative because only four impulse trains are received by the switches DI D2, D3, and D4.
  • the fact that the register is to be taken into use over the approach Sci is determined in the secondary switch MW as has already been stated in connection with calls over the switch I5 in Fig. 1.
  • the secondary switch MW is set on a free alternating current repeater, the wiper cm seizing one of the approaches Cdl
  • the manner of operation when setting up such a call will be described in the following only insofar as it differs from that occurring in the case of the first call to be set up.
  • relay A When relay A receives the second impulse train contact lMrv is opened. In consequence the earth connected to lead Ld at contact I35rc is disconnected so that relay T is released.
  • relay RV releases again. Accordingly winding 17 of relay II is energized over M2, contacts IGILZ, I3'Irv, Itiia and I35rc. Relay II then holds up over contact I 4L2. Through the energizing of relay II the switch D3 is connected up over contact IIILZ since contact IIITcI is closed. Through the closing of contact IMrv after the second impulse train has been received relay R is energized again whereupon relays RI and T energize.
  • An alternating current impulse is again transmitted to the calling station over contacts 5'IrI and SSH to indicate that the register is ready to receive the third impulse train.
  • the energizing of relay T short-circuits relay R so that relay RI releases and terminates the transmission of alternating current from source We.
  • relay RV falls back whereupon winding 1) of relay IV is energized over earth and contacts I 35m, M4111 and H5215, wiper 2M, contacts MM and MSW), relay IV locks up at contact IEIJA.
  • contact IZllA the magnet D4 is connected up for the purpose of advancing the switch when impulses are transmitted.
  • Contact I GM is closed, thereby shunting contact Iilllrq.
  • Relay RQ releases when contact I'IIIA opens. The further establishment of the call is the same as that described in connection with t the first embodiment.
  • relay Th as was described in connection with the first embodiment by the energizing and subsequent release of this relay, the energizing of relay Th having already initiated the release without it being possible for the calling station to prevent the release by commencing to dial before relay Th has released.
  • the mode of operation of relay Th differs in the case of the present call in that if selecting impulses are received when relay Th is energized the release is prevented.
  • Contact 302 is opened and rendersthe opening of contact IIIrcI inoperative.
  • the evaluating devices RM, RK, and X are set in operation in the same way as when in place of relays RCI, C2 and RC only relay RC energizes.
  • Contact Ifl5rcI which is connected to wiper Md and thus to the control lead Ld is however operated once in such a way that a revertive impulse is transmitted to the calling station over contact lt irc only before the reception of the first, second, third, and fifth impulse trains.
  • Relay CI When relay RV has deenergized after the reception of the second impulse train relays R, RI and T are energized in the manner already described, thereby transmitting a revertive impulse to the calling station. Relay T remains energized over contacts 6H? and Isle and earth on the lead Ld.
  • Relay RM energizes.
  • Relay X holds up.
  • Relay RM switches on its winding II over contact IIBrm.
  • Contact I43rm is closed and prevents the connection of earth to the approach sd being interrupted.
  • relay RM receives current over its winding II for a prolonged period. This circuit passes from earth over contacts I24rq, I 25a, I26rv and 81m, relay RM (winding II), magnet D3, battery and earth.
  • the magnet D3 has insufiicient current to energize.
  • Relay X releases because its circuit is broken by the opening of contact I 23a.
  • Relay RV releases. Only now does relay RM, whose winding I is short-circuited over contact I I 41c, commence to make a delayed release.
  • relay RM The delay period of relay RM is used to connect earth at contact 85rm over contact 86w, which has released meanwhile, to the approach Sc of the register so that through the energizing of relay U (winding II), relay MIT is connected up in the manner already described, thereby causing the meter switch ZA to be connected up.
  • the actual metering and the completion of the release of the connection takes place in the manner already described in connection with the previous example.
  • a register for receiving a predetermined number of call-directing trains of impulses and for transmitting to said switches a corresponding number of trains of impulses dependent upon said received call-directing trains of impulses to thereby control the extension of a call over said switches, means for at times seizing said register and for transmitting thereinto trains of impulses of which said predetermined number of call-directing trains of impulses are only a part, and means in said register for at said times determining from another part of said last trains of impulses the value of a call extended in accordance with said call-directing trains of impulses.
  • a telephone systenna register means for seizing said register and for transmitting thereinto trains of impulses, means in said register for at times diverting part of the received trains of impulses, means in said register for causing trains of impulses dependent only upon the received trains of impulses which are not so diverted to be transmitted fromsaid register to control the extension of a callover said switches, and means in said register for determining the value of said call from said diverted part of the received trains of impulses and for causing said register to transmit a characterizing signal only if said call, according to said determination, is of a predetermined value.
  • a register means for at one time seizing said register and for transmitting thereinto call-directing trains of im pulses, means for at another time seizing said register and for transmitting thereinto calldirecting trains of impulses and an interposed call-characterizing train of impulses, impulse transmitting devices in said register, call-evaluating means in said register, and means in said register for, at said one time, bringing said transrnit ting devices successively under the influence of the trains of received impulses to record upon each device in turn the value of a received train and for, at said other time, bringing said transmitting devices successively under the influence of the received call-directin trains of impulses only and for diverting said interposed train upon receipt to said call evaluating means.
  • lines of difierent classes a plurality of registers, each of said registers having a plurality of approaches, automatic switches, means for seizing any one of said lines and for transmitting trains of impulses thereover, and means responsive to said seizure for seizing an idle one of said registers over an approach dependent upon the class of the calling line and for placing said register under control of said calling line to receive said trains of impulses, said register effective in dependence upon the approach over which it is seized to cause a signal to be reverted over said line responsive only to said seizure of said register or to cause a signal to be reverted over said calling line responsive to said seizure of said register and also responsive to the receipt of each of certain consecutive ones of said trains of impulses or to cause a signal to be reverted over said calling line responsive to said seizure of said register and also responsive to the receipt of each of certain nonconsecutive ones of said trains of impulses.
  • means for transmitting a succession of call-directing digits means for diverting a part of the transmitted digits, automatic switches controlled in accordance only with the digits which are not so diverted thereby to extend'a call, and means for determining the value of said call from said diverted part of the transmitted digits and for transmitting a call-characterizing signal in dedependence upon said determination.
  • means for transmitting a succession of call-directing digits means for diverting a part of the transmitted digits, automatic switches controlled in accordance only with the digits which are not so diverted thereby to extend a call, and means for determining the value of said call from said diverted part of the transmitted digits and for transmitting or withholding a call-characterizing signal in dependence upon said determination.
  • a register adapted to receive a plurality of digits, means for seizing said register over any of a plurality of paths, and means in said register effective in accordance with the path over which said register was seized for transmitting a signal either when said register is prepared to receive only a certain one of said digits or when said register is prepared to receive each of said digits.
  • a register adapted to receive a plurality of digits, means for seizing said register over any of a plurality of paths, and means in said register efiective in accordance with the path over which said register was seized for transmitting a signal either when saidregister is prepared to receive only a certain one of said digits or, alternatively, when said register is prepared to receive each of a plurality of said digits.
  • a register adapted to receive a plurality of digits, means for seizing said register over any of a plurality of paths, and means in said register effective in accordance with with the path over which said register was seized for transmitting a signal either when said register is prepared to receive each of said digits or, alternatively, when said register is prepared to receive only certain predetermined ones of said digits.

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US152552A 1936-07-22 1937-07-08 Telephone system Expired - Lifetime US2207519A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2569650A (en) * 1946-12-28 1951-10-02 Automatic Elect Lab Automatic telephone system involving separate operator and subscriber register sender apparatus
US2588685A (en) * 1939-07-26 1952-03-11 Automatic Elect Lab Register-sender for automatic telephony

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2588685A (en) * 1939-07-26 1952-03-11 Automatic Elect Lab Register-sender for automatic telephony
US2569650A (en) * 1946-12-28 1951-10-02 Automatic Elect Lab Automatic telephone system involving separate operator and subscriber register sender apparatus

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