DE579888C - Circuit arrangement for telephone systems with dialer operation - Google Patents

Description

GERMAN EMPIRE

ISSUED AH JULY 4, 1933

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21a ³ GROUP 70 ίο

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

Circuit arrangement for telephone systems with dialer operation

Patented in the German Empire on March 20, 1925,

The present invention relates to dial-up telephone systems, in particular to the triggering of set connection devices.

There are already circuits for telephone systems known in which the triggering by relays operating with delayed armature pick-up or drop-off. With certain Arrangements, e.g. B. for connections via two-wire connecting cables, however, is sufficient this delay in triggering does not ensure that it is carried out properly and always in the correct order To ensure triggering of all connection devices, and to each Prevention of the switching process taking place before the connection is triggered, e.g. B. of the counting process, so that every attempt to do this by any-

ao what influences on the circuits, be it unintentional or intentional, to achieve (for example by pulling up the number switch or briefly pressing the Handset fork after. Termination of the conversation) remains unsuccessful.

Furthermore, an arrangement for two-wire connection traffic is already known, in which tripping only occurs after a number of counting currents have been sent out he follows. Here, the arrangement is made so that the triggering inevitably from is made dependent on the organ generating the counting current surges. This arrangement leaves but only apply if the organ generating the counting current impulses is connected to the connecting devices is assigned at the incoming end, from which the triggering of the connection devices on incoming end is initiated.

The object of the present invention is now to remedy the above-mentioned inconveniences to be eliminated in the case of connections via two-core cables and one of the local situation the devices that effect the switching operations that are still to be carried out before triggering to create independent arrangement, which is achieved by the fact that the upon termination a voice connection that becomes effective. Triggering the set Connection devices to a connection device or line assigned thermal relay acts, which in turn is independent of the switching operations that have to be carried out before the triggering triggers only after a certain time has elapsed.

In the pictures is as. Exemplary embodiment shows a circuit for traffic via two-wire connecting lines. Fig. 1 shows a subscriber station N, a preselector VW, a first group selector I. GW and a transformer Ue at the outgoing end of a two-wire connecting line, while in Fig. 2 a dem

*) The patent seeker stated as the inventor:

Artur Flad in Berlin.

incoming end of the two-wire connecting line associated second group selector II. GW _1, a line selector LW and a subscriber station JV ₁ are shown. The mode of operation of the arrangement will now be described in more detail _{with reference to FIGS. 1} and 2 for a connection between the subscriber station N and the subscriber station JV 1. When you lift the handset at the subscriber station N ίο, the preselector VW starts and occupies a free first group selector / in a known manner. GW. When the switching arms from VW hit the connection contacts of a free group selector /. GW the following circuit is closed: battery, windings I and II of relay T ₁ test arm of VW ₁ winding I of relay C, head contact 1 k, earth. The relay T switches the calling subscriber line through to the speech wires of the first group selector at its contacts 2 t and 3 t and short-circuits its high-resistance winding I at its contact 4 t. The counting magnet ZM, which is connected in parallel to winding II of relay T , is not actuated because the current in this circuit is greatly weakened by the high-resistance winding I of relay C. After switching contacts 2 t and 3 t , relays A and B are switched from /. GW excited via the subscriber loop. Relay C closes the following holding circuit for itself: battery, contact 5 c, winding II of C ₁ normally open contact 6 a, winding of relay V ₁ , earth. In this circuit, the relay V ₁ also responds and prepares the test circuit at its contact 7 »i.

The calling subscriber station now sends out the series of current impulses required to establish the connection with the subscriber station N _1. The lifting magnet, not shown, of the first group selector /. * 5 are raised overall whereby the switching arms of this selector to the desired decade GW operated in a known manner. At the first current surge, the short circuit is canceled via the winding of the relay V ₂ at the contact 6 α , while the winding II of the relay C is short-circuited at the contact 8 a. The relay C does not drop out, however, since it is designed as an enlargement relay. After completion of the first series of impulses, the rotary magnet of the group selector is switched on in a known manner, which the switching arms of /. GW automatically moved over the connection contacts of the desired row of contacts.

If a free transformer Ue connected to contacts of the first group selector is found, the test relay P from I. GW responds in the following way: earth, winding I from P ₁ contact 7 ν 1, winding II from P ₁ test arm from /. GW, winding I of C ₁ , normally closed contact 9 f, battery, earth. The relay P includes on its contact 10 p and η geschlosse-via the first stroke step s head contact 11 k its high-impedance winding I short and turns off at its contacts 12 p and p 13, the speech wires of the first group selector I. GW on the speech wires of the Transformer Ue through. In the transformer Ue , the windings I and II of the relay P are excited via the contact 14 c 1, while at the contact 15 c 1 a holding circuit for the relay C _{1 is closed} via its windings I and II. At contact 16 c 1, the lower speech line becomes the second group selector //. GW switched through.

It should also be mentioned that the circuit for winding I of relay C. at the first stroke of /. GW at contact 1 k is interrupted, while the blocking circuit for the first group selector runs through the break contact 17 m of the release magnet M and the high-resistance resistor W ₁ . 'The relay C closes its contact 18 c, whereby the surge circuit is prepared for the subsequent second group selector, and opens the circuit for the counter relay Z at contact 19 c.

When the calling subscriber station N sends out the next series of impulses, the relay A drops out according to the number of impulses sent and each time it closes the following impulse circuit at its contact 20 α : earth, contacts 20 α, i8 c and 12 p, upper switching arm of /. GW, upper voice wire from Ue, normally closed contact 21 p 1 (Fig. 2), winding of relay A ₁ in the second group selector II. GW, battery, earth. Via a contact of this relay A ₁ , the lifting magnet, not shown, of II. GW is actuated in a known manner in accordance with the number of current pulses sent, which lifts the switching arms to the desired row of contacts. In the first stroke step, the head contacts of the selector are turned over so that the relay C ₂ responds via the contact 22 k and the resistor W ±. This prepares the test circuit for the relay P ₁ at its contact 23 c 2, opens the circuit of the tripping magnet M ₁ at contact 24 c 2 and bridges the one in the upper speech vein of // at its contact 58 c 2. GW lying capacitor Co. The following circuit for relay B _{1 is} closed at the head contact 25 k : battery, normally open contact 26 c (Fig. 1), resistor W _s , contacts 27 ν 2 of the relay V ₂ and 13 p, which is excited during each series of impulses, Switch arm from /. GW, contact 16 c 1, winding of relay B ₁ , contact 25 k, earth. The ReIaIsJS ₁ includes at its contact 28 b 1 a par-

allel to the contact 2i ρ τ running circuit for the relay A ₁ . After the end of the first series of impulses, the relay B ₁ drops because its circuit at contact 27 ν 2 of the first group selector I. GW is interrupted. Via an unillustrated contact of the relay B _1, the rotary magnet of // is. GW switched on, under whose influence the switch arms automatically via the connection

xo contacts of the occupied contact row are moved away until a free line selector LW has been found. In this case, the test relay P ₁ responds in the following way: Earth, winding I of P ₁ , contact 23 c 2, winding II of P ₁ , test arm of II. GW, contact II of the control switch assigned to the line selector LW in position 1, Winding I of relay C ₃ , battery, earth. The relay P ₁ shorts its high-resistance winding I at its normally open contact 29 p ι via the head contact 30 k. Ι p are on the contacts 31 ^ 1 and 32, the opening lines of the second group selector //. GW connected to the speech lines of the line selector LW via the switching arms. In the line selector LW , the relay C ₃ responds and closes a holding circuit for its windings I and II, which is independent of the control switch, at contact 33 c 3.
"30 The next rush series sent by the calling subscriber N is at the contact 20 α of the group selector I. GW via the contacts 18 c, 12 p, 31 p 1, 58 c 2 and the switching arm III of the control switch in position ι on the relay A 2 of the line selector LW transmitted, while the relay B _{2 is} energized for the duration of each series of impulses via the contacts 26 c, 27 ν 2, 13 ρ, 16 c 1, 32 ρ ι and the control switch arm IV in position 1. To one Switching arm of the control switch in position 1, the lifting magnet of the line selector LW is connected in a known manner, which is now actuated by the individual current impulses via a contact of relay A _2. The lifting magnet lifts the switching arms of LW to the desired contact row. After the end of the current impulse series the relay B ₂ drops out and at its contacts 34 & 2 it closes a circuit for the magnet S of the control switch, which runs over the switch arm / in position 1. The magnet 5 ″ brings the control switch to S Position 2, in which the rotary magnet, not shown, of the line selector LW is brought under the influence of the impulse relay A ₂ .

The rotary magnet is actuated in a known manner by the next series of current impulses sent by the calling subscriber station and brings the switching arms into connection with the connection lines of the requested subscriber station Wi. After the end of the series of impulses, the relay B ₂ drops out again and, via its contact 34 b 1 and the control switch arm I in position 2, excites the magnet S ₃ which brings the control switch to position 3. Magnet S is re-energized via switching arm I in position 3 and the control switch is brought to position 4, where the following test circuit is established: earth, switching arm IV in position 4, windings I and II of test relay P ₂ , test arm of LW ₃ Winding of the cut-off relay T ₁ , battery, earth assigned to the preselector of the required subscriber station N _1. The relay P ₂ short-circuits its high-resistance winding I via its contact 35 ρ 2. The switching operations that are required to call the requested subscriber station N ₁ take place in a known manner and will not be described in more detail. When the requested participant reports, the control switch moves to its position 8, so that the relays A ₂ and B ₂ are energized via the switching arms III and IV in position 8 and via the line loop of the requested participant.

If the conversation is over and the calling subscriber N hangs up his receiver, the relays A and B in the first group selector / fall. GW off. The relay A removes the short circuit of the relay V ₂ by breaking the contact 6 α , so that it responds and at contact 27 ν 2 closes the following circuit for the relay B _{1 of} the II. GW : battery, contacts 26 C ₃ 271/2 , 13 p ₃ 16 c 1, winding of B ₁ , contact 25 k, earth. About the contact 28 b 1 , the relay Q in the line selector LW. excited in the following way: battery, winding of A ₁ , contacts 28 & 1, 31 /> i, 58 c 2, control switch arm V in position 8, winding of relay Q, earth. The following circuit for relay G in line selector LW is established via contact 36 q : battery, winding of relay G (Fig. 2), contacts 36 q, 32 p 1, winding of relay ₁ , contact 25 k ₃ earth. The relay C drops out a short time after the short-circuiting of its winding II at contact 8 α and closes its contact 19c, via which the following circuit for the counter relay Z is established: Earth, winding of Z ₃ contacts 19 c, 13 p, 16 ei, 32/11, 36 q, winding of relay G ₃ battery, earth. Relay C interrupts the circuit of relay V ₁ at its contacts 5 c and 26 c . This shorts the winding II of the relay P at contact 37 ν ι , so that it drops out and interrupts the circuit of relay C ₁ from Ue at its contact 10 p.

When relay C1 drops out, contacts 45 c 1 and 46 c 1 are closed. Above

the contact 45 c 1, the relay B 1 is excited by the II. GW in series with the winding II of the relay ^ P, while the relay X is made to respond via the contacts 46 c ι and 47 f. This closes at its contact 48 χ a circuit for the relay A ι of the second group selector, which runs over the energized contact 28 b 1.

The winding of the relay C _{2 is} short-circuited via the contacts 38 a 1 and 39 b 1 in the II. GW , which drops out after a short time and closes the following circuit for the thermal relay TR : Earth, contacts 30 k,

29 p i, 40 c 2, 41 α ι, winding of TR, battery, earth. The relay TR closes its contact 42 tr after a certain time, via which the winding II of the relay P _{1 is} short-circuited. Soon thereafter, the relay P ₁ drops out and closes the circuit for the release magnet M ₁ at its contact 43 ρ ι, which is via the head contact

30 k and over the contact 24 c 2 runs. At contact 2g ρ ι the holding circuit for relay C _{3 is} interrupted by LW.

If the second group selector reaches the rest position under the influence of the release magnet M ₁ , the contact 25 k is opened and the relays B ₁ and F drop out. Relay B ₁ interrupts the circuit of Re-IaIs- ^ ₁ at contact 28 & 1, while relay F at contact 47 / opens the circuit of relay X.

In the first group selector J. GfF, the relay Z when it responds via the contact 44 ζ produces a shunt to the resistor W ₁ via the resistor W ₂ . As a result, the current flowing via the test wire to the counter ZM is amplified in such a way that the counting magnet ZM responds and advances the counter.

If the requested subscriber .AT ₁ hangs up his receiver, relays A ₂ and B ₂ drop out. At contact 49 α 2, a circuit for the magnet S of the control switch is closed via the switching arm I in position 8, so that the control switch moves to position 9. From this position it is only _{advanced after the relay C 3 has} dropped out by closing the contact 50 c 3. In position 10, the magnet S is re-excited via the contact 49 α 2 and moves the control switch to position 11. The winding II of the relay P 2 is short-circuited via the control switch contact III, so that it drops out and closes the following circuit for the release magnet M _2: Earth, contacts 50 c 3, $ 1 p2, switch arm II in position 11, winding of M ₂ , battery, earth. The release magnet brings the line selector back into the rest position in a known manner, in which the head contact 52 k is closed, via which the magnet S responds again and returns the control switch to the rest position. In the first group selector I. GW , after the relays V ₁ and P dropped out, the following circuit was closed for the tripping magnet M : Earth, contacts S3 h> $ 4p, 55 ^ ² . 56 ^ 1, winding of M, battery, earth. The release magnet M leads the group selector I. GW back to the rest position in a known manner. By opening the contact 17 ″ the circuit for the relay T of the preselector VW is interrupted, which causes the VW to switch to its rest position in a known manner.

If the thermal relay TR were not provided in the second group selector II. GW , the calling subscriber station N could prevent the counting current surge from occurring by pressing its dial again. When sending out a further series of rushes, relay A drops according to the number of rushes and opens the short circuit for the winding of relay V ₂ at its contact 6 α , so that it responds and relay B ₁ from via its contact 27 ν 2 in the manner described above II. GW excited. The relay B ₁ closes a circuit for the relay A ₁ at its contact 28 b 1, if the called subscriber has not yet hung up, in the following way: battery, winding of the relay A ₁ , contacts 28 b 1, 31 ρ ι, 58 c 2, control switch arm V in position 8, winding of relay Q, earth. The relay C _{2 is} short-circuited via the contacts 38 α ι and 39 b ι of the energized relays A ₁ and B _1. This would short-circuit the winding II of the relay P ₁ at its contact 40 c 2 , so that the relay P ₁ drops out. On contact 43 p 1 of the tripping magnet M would then switched _1, wherein the group selector II. GW returns to the rest position. The contact 32 ρ ι would interrupt the lower speech wire, so that the counting relay Z in the first group selector /. GW would not respond because contact 19c is still open. In the present case, a premature triggering of the second group selector is prevented, since the relay C ₂ switches on the thermal relay TR via its contact 40 c 2. When relay C ₂ drops out, the circuit for relay A _{1 is} interrupted at contact 58 c 2 and a holding circuit for relay Q of LW is closed at contact 57 c 2 via the choke coil Dr. At contact 41 α ι the relay A ₁ interrupts the circuit of the thermal relay TR, so that a short circuit of the winding II of the test _{relay P 1 is} excluded as long as the calling party has not hung up his phone.

Claims (4)

Patent claims: ι. Circuit arrangement for telephone systems with dialer operation, in particular for two-wire connection traffic and delayed release of the set connection devices, characterized in that the incentive to release the set connection devices which becomes effective when a voice connection is terminated is sent to a thermal relay ( II. GW) or line assigned to a connection device (II. GW) or line. TR) acts, which, regardless of the switching operations that have to be carried out before the triggering, in turn only causes the triggering after a certain time has elapsed. 2. Circuit arrangement according to claim i, characterized in that the thermal relay (TR) is assigned to the connecting devices (J /. GW) at the incoming end of a two-wire connecting line. 3. Circuit arrangement according to claim i, characterized in that the thermal relay (TR) is switched on with a delayed armature drop by a known per se, energized during a speech connection trip _{relay (C 2).} 4. Circuit arrangement according to claim 3, characterized in that in addition to the thermal relay (TR) two or more delay devices (delay relays C ₂ and P ₁ ) control the tripping circuit in such a way that only after influencing all the delay devices, the triggering of the connecting devices (II. GW , LW) . 1 sheet of drawings