DE576858C - Circuit arrangement for telephone systems with dialer operation, in which the supply of intercommunicating extension subscribers takes place from the office battery or a wire of the subscriber line is used for special purposes - Google Patents

Description

GERMAN EMPIRE

ISSUE All May 18, 1933

REICH PATENT OFFICE

PATENT LETTERING ^

CLASS 21a ³ GROUP 64 so

Siemens & Halske Akt.-Ges. in Berlin-Siemensstadt *)

Core of the subscriber line for. serves special purposes

Patented in the German Empire on September 4, 1928 ah

The present invention relates to a circuit arrangement for telephone systems with selector operation, in which the supply of recipients communicating with each other from the exchange battery or a wire of the subscriber line for special purposes, e.g. B. for signal transmission, is used.

The aim of the invention is to carry out the connection devices of the exchange those to be caused by the connection points to set up or complete a connection Switching operations in a particularly simple and reliable manner to affect flow, and this is achieved in that, a Switching means by switching operations caused by connection points for construction or to complete a connection via a wire of the connection line to the effect geao is brought and the switching devices in the connection devices of the exchange influenced by the part of the second wire not used for special purposes.

In the drawings, exemplary embodiments of the present invention are shown, namely shows

Fig. Ι an arrangement for 'telephone systems with call seekers, group dialers and line selectors, in which the supply for intercommunicating extension subscribers N ¹ and N ^s from the public battery via: earth, battery, throttle tank D ⁱ , b Wire, inductor D °, and now once via inductor D ⁷ via subscriber loop from N ¹ , inductor D ⁸ to earth and the other time via inductor D ⁹ via subscriber loop from IV ² , inductor D ¹⁰ to the end. 4 »

Fig. 2 shows a system with preselectors, group selectors and line selectors, in which signals for any special purpose (alarm) are transmitted ^{via a wire of the connection line for the subscriber JV 8.}

Fig. 3 shows a further arrangement of the switching means, which via a wire of a Connection line is brought into effect and certain switching operations via the other wire brings about, in this case when reporting the connection point in the case of connections in the incoming direction, only the disconnection of the ringing current causes. 55-

If the main unit shown in Fig. 1 in conjunction with a private branch exchange system wants a Connection with any participant of the

*) The patent seeker has been named as the inventor;

Max Langer in Berlin-Hermsdorf

570858

public system and lifts his receiver for this purpose, the relay A is excited via the one wire, in this case the a wire, in the following current paths: earth, inductor D ² , subscriber loop of the main station N, α- Wire, relay A, contact 1 1, resistance Wi, battery, earth. By closing the contact 2 a , the transmission of the call stimulus given via the α-wire ίο is effected via the & -wires, in this case the relay T via: earth, battery, choke coil D ⁵ , contact 2 a, contact 3 1, winding I of relay T, earth is energized. By energizing the relay T. 15 through the winding I only the contacts 4 1 and 5f are closed. The following circuit for relay R is established at contact 4 1 : earth, contacts 4t, £ 30, relay R, battery, earth. By closing ao of the contact 6r , the rotary magnet DM is energized intermittently via: earth, relay interrupter RU, contacts 6r ₃ yp, rotary magnet DM, battery, earth, so that the switching arms of the call seeker AS are advanced until the switching arms of the The call seeker can reach the connecting line of the caller and the ^{following circuit is established via the switch arm c 1 of} the call seeker AS : Earth, contact 8r, winding II and I of the relay P, switch arm c ^{1 of} the call seeker AS, contact 5 t, winding II of the relay T. , Battery, earth. In this circuit, the relay / ^{3 is} energized, and furthermore, the opening of the contacts 1 1 and 3 1 is caused by the current flowing in the winding II of the relay T. The contact γ ρ is opened by relay P, so that the rotary magnet DM is stopped.

At the contacts iop and 126 ^ 4.0 the through-connection and thus the excitation of the impulse receiving relay A ^{1 takes place} , namely the winding I receives power via: earth, choke coil!) ² , subscriber loop of the main station N, α-wire, relay .4, Switching arm α ^{1 of} the caller AS ₁ contact I2 (5j>, winding I of relay A ¹ , battery, earth, while ^{winding II of relay ^ 1} via earth, winding II of relay A ¹ , contact iop, switching arm b ^{1 of} the call Suchers AS ₁ contact 2 a, choke coil D ⁵ , battery, earth is excited. Contact up creates the following circuit: earth, head contact 12 k, winding I of relay C, contact up, battery, earth. Relay C responds, so that now the relay C is kept excited by closing the contact 13 c over both windings as soon as the head contact 12 k is opened after the first stroke of the group selector. The short circuit for the relay C at contact 14 a ¹ is canceled because the relay A ¹ after setting the call finder a uf the connection line, as previously mentioned, has been excited. Another call seeker can get onto the connecting line by short-circuiting winding II of relay P. The circuit for the relays P and T is now as follows: earth, contacts GP, 125c, winding I of relay P, C ¹ switch arm of caller AS, contact 5 1, winding II of relayT, battery, earth.

The subscriber N sends the first current pulse series, the relay A ¹ is brought in accordance with the interruptions of the impulse transmitter to drop, namely, the coil i of the relay A ^1, the current directly through the interruptions in the current impulse transmitter, however, the winding II of the relay A ¹ by the contact 2 α pulsed withdrawn, since the relay A ¹ lying relay A is brought likewise corresponding to the interruptions in the impulse transmitter to drop in the circuit of the winding I. The lifting magnet HM receives current impulses according to the series of impulses via: earth, contact 15a ¹ , 16 c, shaft contact ijw, winding I of relay V, lifting magnet HM, battery, earth. The. Switching arms of the group selector GW are raised to the corresponding row of contacts. Relay V remains energized during this series of impulses. After the end of the series of impulses, this falls off, so that by closing contact 18z / the rotary magnet DM ^{1 of} the group selector via: earth, contact 19 ^ ¹ , contact 18 z /, head contact 20 k, rotary magnet DM ¹ , battery, earth receives power. The switching arms of the group selector turn in one step. Simultaneously with the energization of the rotary magnet DM ¹ , the contact 2IdW ^{1 is} closed so that the relay V is again energized via: earth, contact 21 dm ¹ , windings II and I of relay V, lifting magnet HM, battery, earth. In this circuit, the lifting magnet HM is not excited by the corresponding resistance ratios of the relay V. The relay V opens its contact i8w, so that the circuit of the rotary magnet DM ^{1 is} interrupted and thus the contact 21 at ^{1 is also} opened. The relay V is again de-energized, which has a closing of the contact 18 ν as a result, the rotary magnet DM ¹ is brought to respond again via the circuit already mentioned and this advances the switching arms of the group selector GW one step. This cooperation of relay V and rotary magnet DM continues until the group selector has found a free line selector LW and via earth, contact 22 c, 23 a ¹ , windings II and I of relay P ¹ , switching arm c ² of group selector GW, shaft con -

576 S5S

clock 24ze /, winding II of the relay C ¹ , battery, earth the relays P ¹ and C ^{1 are} energized. By opening the igp ⁱ contact, the circuit of the rotary magnet DM ^{1 is} interrupted so that it can no longer be excited. By closing the contact 25 p ¹ , the winding of the relay P ^{1 is} short-circuited, so that no further group selector can adjust to the occupied line selector LW. The relay V is de-energized after the group selector has been set to the line selector. The line to the selector LW is connected through the contacts 26 z / and 2.Jv, which have moved into the rest position, as well as through the contacts 28p ¹ and 2.Qp ¹ .

After checking the group selector GW , as already mentioned, the relay C ^{1 is} energized, so that the contact 31c ^{1 is} closed. The relay C ¹ now receives current through both windings.

If the subscriber sends out another series of current impulses, the relay A ^{1 of} the group selector GW is caused to drop out in the manner described above in accordance with the interruptions at the subscriber station, so that the relay A ^{2 of} the line selector through the contact 33 a ¹ , via earth, Contacts 32 Cy 33 a ¹ , 29 p ¹ , switching arm a ^{2 of} the group selector GW, windings I and II of the relay A ¹ , battery, earth is excited in the same way. The lifting magnet HM and the relay V in the group selector GW are not influenced when the relay A ^{1 drops out} and thus the contact 15 a ¹ closes, since both the lifting magnet HM and the three windings of the relay V are connected in series and so are the relationships are designed so that they cannot be brought into effect here.

By energizing the relay A ² in the line selector LW , the lifting magnet HM ¹ and the relay V ¹ receive current via the following path: earth, contact 34a ² , winding I of the relay " V ¹ , contact 3-5", shaft contact 36 "/, lifting magnet HM ¹ , battery, earth. Corresponding to the interruptions at the subscriber station, the line selector LW is now raised to the corresponding row of contacts.

. During this series of impulses, the relay V ^{1 is} energized, since after each time the relay Ar drops out, the contact 37a ^{2 is} closed and the winding II of the relay V ^{1 is} short-circuited, so that it works as a delay relay and only if the relay A ^{2 drops out for a longer period of time} , ie after the series of current impulses has ended, brings its armature into the rest position. If this = the case, the relay U is energized via: earth, via the head contact 38 k, which was closed during the first stroke, contacts 39 ^ ¹ , 40 c ¹ , winding I of relay U, shaft contact 36ζεγ lifting magnet HM ¹ , battery, earth . The HM ¹ lifting magnet does not respond in this group. When relay U responds, contact 35 «is opened and contact 41μ is closed. The further series of impulses emitted by the subscriber N now influences the rotary magnet DM ² , in that it is ^{transmitted through contact 34a 2} via: earth, contact 34a ² , winding length I of relay V ¹ , contact 41 U, contact 42 p ² , rotary magnet DM ² , Battery, earth is operated. The line selector LW is set to the desired connection by the last series of impulses. The relay V ^{1 is also} kept energized during the last series of current impulses. During this time the relay U receives power from: earth, contacts 43 c ¹ , 44 ″, 45 z / ¹ , winding II of relay U, battery, earth. After the series of current impulses has ended, the relay V ^{1 is} de-energized, the contact 45 v ^{1 is} opened and the contact 46 σ ^{1 is} closed. The holding circuit of relay U. is thus interrupted. But this does not fall off, but receives, came when the circuit for the relay P described later ^two states, again by about the winding III excited relay V ¹ Power on Earth, Kontakte43.c ^1, 44 ', 45p ^1, Winding II of relay U, battery, earth.

It is assumed that the selected arrival is formed _go circuit in the same manner as the main body shown in Fig. 1 N. If these dates, the relay P ² u via contact 43.c ^1, 44, 46 z / ¹ , winding II and I of the relay P ² , switching arm c ^{4 of} the line selection levs LW via the windings II of the relay T of the caller of the desired connection point, battery, earth.

Relay P ² responds and, by closing contact 47, causes p- short circuit of winding II of relay P ² , so that another line selector is not able to adjust to the occupied connection. At the contacts 52 p ² and 53 £ ^{2 the connection} takes place in the line selector LW. Furthermore, the contact 42 p ^{2 is} opened and the contact 48 p ^{2 is} closed. The relay V ¹ is energized intermittently by the relay interrupter RU ¹ via: earth, relay breaker cup RU ¹ , contact 4.911, winding III of relay V ¹ T contact 503 ;, contact 48 ^ ² , rotary magnet DM ² , battery, earth. The rotary magnet DM ² does not respond in this circuit. On the other hand, when contact 45 z / ¹ closes, relay U, as already mentioned, receives power again via the holding circuit (earth, contact 43 c ¹ , 44 t «, 45 z; ¹ , winding II of relay U, battery, earth ). The relay U does not follow the interruptions of the relay V due to its delay. At the contact 51 v ¹ , pulsed ringing current from the ringing current machine RM is applied to the α-wire.

If the called connection point responds, when the receiver is picked up, the switching means A assigned to this point is also activated via the one wire, namely via earth, choke coil D ² , subscriber loop of the called connection point, relay A, switching arm α ^{4 of} the line selector LW, contacts 52 /, 54th Ü ¹ , winding II of relay A ² , battery, earth energized. The relay A of the called connection point is energized, so that by closing the corresponding 2 α-contact over the 6-wire the disconnection of the ringing current takes place in that the relay Y in the line selector LW via: earth, battery, choke coil D ⁵ , contact 2α of the called connection point, switching arm b ⁴ · of the line selector, contact 53 p ² , relay Y, earth is energized. The relay Y responds, opens its contact 5031, so that the circuit of the relay V ^{x is} interrupted ao.

So here too there is an incentive to induce one Switching process over the one wire (α wire) and the transmission of this stimulus over the the other wire, d. H. in this case, the to switch off the ringing current via a Vein given incentive passed on to the other vein.

If the caller hangs up after the call has ended, see above. fall the. Relays A and A ¹ as a result of an interruption at the subscriber station. By short-circuiting the relay C at contact 14 a ¹ , this also switches its contacts into the rest position, so that the circuit for the relays P and T is opened at contact 13 c and the circuit for the relays P and T at contact 125 c.

By closing the contact 124c, the relay P ^{x is} short-circuited. This drops out, opens the circuit of the relay C ¹ at contact 25 ^ and restores the circuit of the rotary magnet DM ¹ at contact 19 p ¹ . This is energized, switches the arms of the group selector GW one step further and, by closing its contact 21 dm ^1, causes the relay V to be energized. The rotary magnet DM ¹ and relay V now work together in the manner described above until the group selector GW has reached its rest position, ie until the head contact 20 k is opened and thus the circuit of the rotary magnet DM ^{1 is} no longer established.

By interrupting the circuit for the C ^ relay, opening contact 31c ¹ prevents the line selector LW from being occupied during the triggering process, ie re-energizing relay C ¹ , since the shaft contact 241 "remains open until the switching arms of the line selector LW have reached the rest position and so cannot respond via this shaft contact 24ZC / relay C ^{1 either.} Furthermore, after the relay P ^{2 has} dropped out by opening the contact 43 c ¹ , the following current path for the rotary magnet DM ~ of the line selector LW is established: earth, head contact 123 k, contacts 122V ¹ , 121 c ¹ , 120 M, 42 p ² , Rotary magnet DM ² , battery, earth. The rotary magnet DM ² is excited, switches the arms of the line selector LW one step further and, by closing contact 117 dm ^2, excites relay U via: earth, contacts 119 «, 118c ¹ , 117dm ² , winding II of relay U, Battery, earth. This opens its own current path at contact 119.K and the excitation circuit for the rotary magnet DM ² at contact 120 u. Since relay U works with a drop-out delay, an interruption time is created for the rotary magnet DM ² . After this, however, this is again excited via the previously described route and causes the line selector arms and the excitation relay to switch on. This is repeated until the line selector LW has reached its rest position, ie until the head contact 123 k is opened and the current path for the rotary magnet DM ^{2 is} no longer established. . go

The following describes the establishment of a connection that a subscriber N ³ in FIG. 2 wishes to establish with another subscriber in the system.

The connection line of the subscriber 2V ³ is designed in such a way that signals can be transmitted via one wire. The signal transmission is achieved as follows: In the vicinity or at the connection point of the subscriber N ^B , the signaling point is assigned a key X, which is pressed as soon as a signal transmission is to take place. This can be done to give an alarm if there is a risk of fire, etc. The following circuit for the relay Al is produced by pressing the X button: Earth, TASTEX, Relais Al, relay breaker RU ^2, battery, earth.

The relay ./4/ is energized intermittently, so that the following circuit for the relay S is established by closing the contact 55 al : earth, contact 55 a /, choke coil D ² ", line b ^B , choke coil /) ²¹ , relay S , battery, earth. the relay »S ¹ is in the same manner as the relay Al energized so that as the lamp L s is flickering caused to light up by closing and opening the contact 56th the lamp L is assigned to an alarm receiving center, which in known way causes the further.

If the subscriber N ^s wishes to be connected to a subscriber of the same type and lifts his receiver for this purpose, so

the relay A ^{3 is made} to respond via the following path: earth, choke coil D ²² , subscriber loop of the connection point N ^s , a'-wire, relay A ³ , battery, earth. This call stimulus received via the α ⁵ wires is passed on by closing the contact 57a ³ via the & wires, in which the relay R ^{1 of} the preselector VW via: earth, relay R ¹ , contact 58t ² , contact 57a ³ , inductor D ²³ , Battery, earth is energized. The relay R ¹ responds and closes its contact 59? ' ^1, so that the rotary magnet DM ^3: earth, relay interrupter RU ^3, rotary magnetic DM ^3, contact 60 1 ^2, contact 597- ^1, shifting d ⁷ of the preselector VW in the zero position, battery, earth operated and causes the selection VW to adjust to a free group selector GW ^1. After the first current surge, the rotary magnet DM ^{3 of} the preselector VW receives further current surges via: earth, relay interrupter RU ³ , rotary magnet DM ³ , contact 60 1 ² , switching segment ι to 10, switching arm d ^{7 of} the preselector VW, battery, earth. If a free group selector GW ^{1 is} found, the following circuit is established: earth, head contact 6r / j, contact 62 w ² , contact 63 &, switching arm c ⁷ of preselector VW, winding I and II of relay T ² , contact 59 r ¹ , segment 1 to 10, switch arm d ^{7 of} the preselector VW, battery, earth. The relay T ² responds and, by opening the contacts 58 1 ² , 64t ² and closing the contacts 65 i ² and 66 1 ^2, causes the line to be switched through and thus the relays A * and B to respond, namely i. via: earth, battery, relay ^ ⁴ , switching arm a ⁷ of preselector VW, contact 65 1 ² , ' a ⁵ wire, subscriber loop of connection JV ³ , choke coil D ²² , earth. 2 .: Earth, contact 67 a ⁴ , winding II of relay B, switch arm V of preselector VW, contact 66 t ² , contact 57 a ³ , choke coil rf ²³ , battery, earth. By opening contact 670? the short circuit for winding I of relay B is canceled, the relay is thus kept energized via both windings.

By opening the contact 63 b the short circuit of the relay C ^{2 is} canceled, the latter responds and by closing the contact 68 c ^{2 establishes} a circuit for the relays C ² and T ² independent of the contact 62 v ² and the head contact 61 k .

If the subscriber now sends out the first series of impulses, the relay A ⁱ in the previously described circuit is caused to drop out in accordance with the interruptions at the subscriber station. The interruptions at the connection point do not affect the relay A ³ assigned to the connection line and the relay B dependent on it, since the latter is designed to decrease with a delay. The relay A * influences the following circuit for the lifting magnet HM ^{2 of} the group selector GW ¹ according to the interruptions at the connection point: earth, contacts 69 a ⁴ , 70 c ² , windings II and I of relay V ² , lifting magnet HM ² , battery , Earth. The group selector GW ¹ is raised to the desired contact row. Only after the end of the series of impulses does the relay V ^{2 drop out, since this relay is short-circuited at contact 71 α 4} during the individual interruptions in the series of impulses and thus works as a delay relay. After the series of current impulses has ended, the relay V ² drops out. In the rest position of the ^ contacts, the following circuit is now established for the rotary magnet DM * . Earth, contacts 73 p ³ , the head contact 74 k, contact 75 z, which closes in the first stroke step; ² , rotary magnet DM ⁴ , battery, earth. The rotary magnet DM ⁱ responds and causes the arms of the group selector GW ^{1 to be switched} one step further. ' Simultaneously with the response of the rotary magnet DM ⁴ , the contact 77 dm * is opened and the contact 76 dm * is closed, so that the following current path for the relay V ² is established: earth, contact 76 dm *, winding I of the relay V ² , lifting magnet HM ² , ' battery, earth. The HM ² lifting magnet does not respond in this circuit. The contact 75 v ² is opened and thus the current flow of the rotary magnet DM ^{1 is} interrupted. As a result, contact 76 dm * is also opened and contact 77 dm * is closed. The shaft contact 72.1a , which is opened during the first turning step, prevents the relay V ² from receiving any delay when the contact 77 dm * closes. The relay V ² is de-energized, so that the contact 75 v ² returns to its rest position and the rotary magnet DM * receives power again and the switching arms of the group selector GW ¹ are switched one step further. This reciprocal interaction of relay F ² and rotary magnet DM * takes place until the group selector GJ ^ F ^{1 has found} a free line ^{selector LfF 1} . If this is the case, the following circuit is established: Earth, contact 78 c ² , 79 a ⁴ , windings II and I of relay P ³ , switching arm c ⁸ of group selector GW ¹ , head contact 80 k of line selector LW ¹ , winding II des Relay C ³ , battery, earth. The relays P ³ and C ³ respond. By opening contact 73 p ³ , the circuit for the rotary magnet DM * is interrupted, while by closing contact 81 p ^3, winding II of relay P ^{3 is} short-circuited and thus the line selector LfF ^{1 is occupied} by another group

voter is prevented. By seeing the. Contacts 82p ³ and 83 p ³ are switched through the lines.

If the subscriber sends out the next series of current impulses, relay A ^B is activated by the pulse- wise releasing relay A ^ of group selector GW ¹ via: earth, contacts 84c ² , 85a ⁴ , 83p ⁸ , switching arm α ⁸ of group selector GW ¹ , windings I. and II of the »ο relay A ^s , battery, earth energized in the same way. As a result, the lifting magnet HM ³ receives current impulses via: earth, contact 86 a ⁵ , winding I of the relay V ³ , contact 87 u ¹ , shaft contact 88 w, lifting magnet HM ³ , ¹ S battery, earth. The line selector LW ¹ is thus raised to the desired contact row.

The relay V ³ in the circuit of the solenoid HM ³ is kept energized during the current ^2t > series of surges, in that after each time the relay A ⁵ drops out, the winding II of the relay V ³ at the contact 8g α ^{5 is} short-circuited and thus the relay V ^{3 is} dropout delayed. If the relay V ³ drops out after the end of the series of impulses, the following circuit is established for the relay U ¹ : Earth, head contact 90 k, contacts 91 z / ³ , 92 c ³ , winding I of relay U ¹ , shaft contact 88 «/, HubmagnetiOi ³ , Battery, earth. The HM ³ lifting magnet is not actuated in this circuit. When relay U ^{1 responds} , contact 87 z « ^{1 is} opened and contact 93 u ^{1 is} closed.

If the subscriber sends out the last series of impulses, the relay A ⁵ is excited in the same way as previously described in accordance with the interruptions at the subscriber station and thus the rotary magnet DM ⁵ via: earth, contact 86a ⁵ , winding I of relay V ³ , Contact 93 u ¹ , contact 94 £ ⁴ , rotary magnet DM ⁵ , battery, earth operated. The relay V ^{3 also} remains energized during this series of current impulses. The relay U ¹ is held during this time via: earth, contacts 95 c ³ , 96 w ¹ , 97 v ³ , winding II of relay U ¹ , battery, earth, since the circuit for winding I of relay U ¹ after first turning step is interrupted by the opening shaft contact 88 w . If the relay V ³ drops out after the end of the series of current impulses, the test is carried out. As a result of its delay, the relay U ¹ remains energized until, after the test, the relay V ^{s is} again made to respond via the winding III. The circuit of the test relay P ⁴ is as follows: earth, contacts 95c ³ , 96 u ¹ , 98 z> ³ , windings II and I of relay P ⁴ , switching arm c ^{9 of} the line selector LlV ¹ , line c ¹⁰ to the switching arm c of the preselector of the desired connection, winding I and II of the relay T of the preselector, switching arm d, battery, earth. The relay P ¹ in the line selector LW ¹ responds and, by closing the contacts 99 ^> ⁴ and ioop ^i, switches through the line selector.

Furthermore, the contact 94 p * is opened and the contact loip * is closed, while the winding II of the relay P ^{4 is} short-circuited at the contact iO2p ⁱ , so that the setting of a further line selector to the connection point is prevented.

As mentioned previously, it is assumed that the desired connection point is designed in the same way as the calling station shown in FIG. To ground, relay interrupter i? [7 ^4, contact 103%, winding of the relay III V ^3, contact ^1043/1, ιοιρ \ rotary magnetic DM ^5, battery, earth relay V is energized pulse-wise ^s. The rotary magnet DM ^S is not actuated here. The relay U ¹ now receives power via: earth, contact 95 c ³ , 96 u ¹ ; gyv ³ , winding II of relay U ¹ , battery, earth. Even during the pulsed excitation of the relay V ^s , the relay U ¹ does not drop out, since the latter, as already mentioned, is designed with drop-out delay. The relay V ^s , which responds in certain time segments , also opens the contact 105 v ³ and closes the contact ^{ιοβν 3} in the same way, so that the ringing current is sent from the ringing current machine RM to the called connection point. Logs the desired subscriber, then the corresponding relay A will be ^3, this arrival circuit location ⁹ S: earth, battery, relay ^ ^3, the subscriber loop to the desired connection point, the choke coil D ^22, earth energized. The ^ relay of the desired connection point responding via the α wire now causes the Y ^ relay in the line selector LW ¹ to ^{respond by closing the corresponding a 3} contact via the fr wire, namely via earth, battery, choke coil D ²³ , a ^{3 -contact 57a 3} , & ¹⁰ -wire, switching arm δ ^{9 of} the line selector LW ¹ , contact 99 p ^l , relay Y ¹ , earth. The relay F * responds and causes the opening of the contact 1043; ¹ the interruption of the circuit for the relay V ³ . There is therefore no further transmission 1 ³ · ⁰ . of the ringing current. Since relay V ^{s is} no longer excited, relay U ^L also drops out. The participants are now connected to each other.

If the conversation is ended and the calling subscriber N ³ hangs up his receiver, the relay A ³ at the connection point is de-energized and thus relay B in the group selector GW ^{1 by opening the contact 57a 3} . Relay B short-circuits relay C ² at contact 63 b , so that relay C ^{2 also} switches its contacts to the rest position. Relay C ²

shorts the circuit of relay P ³ at contact 107 c ² so that it drops out and the rotary magnet DM * is re-energized via: earth, contact 73 ^ ³ , head contact 74ft, contact 75 z> ² , rotary magnet DM ⁴ , battery, earth and the switching arms of the group selector GW ¹ advances one step. When the rotary magnet DM ¹ responds, the contact 76 dm * is also closed, so that the relay V ^{2 is} excited via: earth, contact 76dm *, winding I of the relay V ² , lifting magnet HM ² . The HM ² lifting magnet does not respond in this case. Relay V ² opens contact 75V ² , whereby the circuit of the rotary magnet DM ^{4 is} interrupted. The contact 76 dm * is therefore opened again, so that the contact 7Sw ² also returns to the rest position. The rotary magnet DM * thus receives electricity again via the aforementioned path.

This is repeated until the group selector GW ^{1 has left} the last contact in the series and the switch arms of the selector are brought into the rest position by mechanical force. If this is the case, the head contact 74k is also opened again and renewed excitation DM * is prevented.

As mentioned before, the relay C ^{2 was} short-circuited by closing the contact 63 b , so that it dropped out and the relay P ^{3 was} also short-circuited by short-circuiting the winding I of the relay P ³ through contact 107 c ² , so that it dropped out. Thus, the circuit of relay C ³ at contact 81 p ^{3 was also} interrupted, so that this also switched its contacts to the rest position and thus via: earth, head contact 110 k, contacts 111 z / ^s , 112c ³ , 113 « ¹ , 94p *, Rotary solenoid DM ⁵ , battery, earth the rotary solenoid DM ^{5 is} energized and the switching arms of the line selector advances one step.

■ If the rotary magnet DM ⁵ responds, the relay U ^{1 is} excited via: earth, contacts 114M ¹ , 115C3, ii6dm ⁵ , winding II of relay TJ ¹ , battery, earth. Relay U ¹ is activated and opens the contact 113Ji ¹ the circuit of the rotary magnet DM ⁵ and the contact ^1142/1 the dedicated circuit, so that relay U ¹ again falls and the circuit of the rotary magnet DM ^S previously described again comes about and thus the arms of the line selector can be advanced one step further. This takes place until the voter has left the last contact in the series and the line selector is brought into the rest position by mechanical force in a known manner. Fig. 3 (see Fig. 1, bottom left) shows a further arrangement of the switching means A at the connection point, which picks up the stimulus received via one wire and passes it on via the other wire. In the present case, when the subscriber reports, relay A is excited via the α-wire, and the incentive to switch off the ringing current, which is given here, is passed on via the other wire, the δ-wire. The switching means A is in the present case in the part of the subscriber line coming from the line selector. In the present case, the call stimulus is picked up directly by the T-relay of the preselector. In order to prevent the switching means A or A ³ assigned to the connecting line from being influenced during the transmission of ringing current in the case of connections in the incoming direction, it is given a drop-out delay.

Claims (5)

Patent claims: i. Circuit arrangement for telephone systems with dialer operation, in which the supply of mutually exchanging extension subscribers takes place from the exchange battery or a wire of the subscriber line for special purposes, e.g. B. for signal transmission, is characterized in that a switching means (A or A ³ ) is brought into effect by switching operations caused by connection points to establish or complete a connection via a wire of the connection line and the switching devices in the connecting devices of the The exchange is influenced by the part of the second wire that is not used for the special purposes. 2. Circuit arrangement for telephone systems according to claim 1, characterized in that the switching means (A) is brought into effect for connections in the incoming direction and reporting of the subscriber via a wire (a) and causes the disconnection of the ringing current via the other wire (b) . 3. Circuit arrangement for telephone systems according to claim 2, characterized in that the switching means (Abzw. A ³ ) is designed as a delay relay to prevent a change in its state of excitation when sending out ringing currents and number current surges. 4. Circuit arrangement for telephone systems according to claim 1, characterized in that the switching means (A or A ³ ) picks up the call stimulus for connections in the outgoing direction via a wire (a) and passes it on via the other wire (b) . 5. Circuit arrangement for telephone systems according to claim 4, characterized in that the switching means (A or A ³ ) for connections in the outgoing direction also acts via a wire directly on the surge receiving relay of a downstream switching device (z. B. transformer or group selector) transmits via the other wire (b). Ö. circuit arrangement according to claim, characterized in that through current surges passed on by the switching means act on a second winding of the surge receiving relay, which is also directly influenced by current surges. For this purpose 2 sheets of drawings