DE617138C - Circuit arrangement for telephone systems - Google Patents

Description

GERMAN EMPIRE

ISSUED ON AUGUST 13, 1935

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21a ³ GROUP 37 oi

S 10525p VIIIaJ2ia ^s Date of publication of the patent grant: July 18

Siemens & Halske Akt.-Ges. in Berlin-Siemensstadt *) Circuit arrangement for telephone systems

Patented in the German Empire from i. July 1932

The present invention relates to a circuit arrangement for telephone systems with several offices in a row, over which connections different traffic directions getting produced.

An example of such an arrangement is the so-called. Through traffic, in which a long-distance connection established via several transit exchanges located in different locations and the individual transit offices have access to the local offices of the individual locations. In through traffic must now in the offices to transmit the signals in both directions one Connection different monitoring relays are provided, which are usually in one Bridges to the speech line lie and against each other by transformers or capacitors are separated. These arrangements have the disadvantage that the speech streams in a connection running over several offices due to the large number of bridges and capacitors in the speech circuit. There are now Arrangements become known which avoid this disadvantage in that in connections In certain traffic directions the bridges unnecessary for the supply are switched off will. A shortcoming of this arrangement is that when the connection runs over longer connecting lines the Energy applied to the transmission of the monitoring signals at the beginning of the line at the far end of the line is no longer sufficient to carry out the desired switching operations bring about. This disadvantage is particularly evident in long-distance traffic with alternating current impulses palpable. According to the invention, it is avoided in that there are connections in certain directions of traffic Switching means in the offices so effective that of the attenuating the speech currents Switching means in the speech circuit only a bridge relay remains switched on and for the transmission of signals in the incoming and outgoing direction of the established connection is used.

The accompanying figure shows an example of implementation of the invention. Shown are the facilities of a transit exchange, via which remote connections and local connections can also be established.

Through connections run from the trunk line FL ₁ arriving from a remote office via the transformer Ue ₁ , the group selector GW, the transformer Ue ₂ and the trunk line FL ₂ to another remote office. Connections, which should remain in the place of the transit office, ver. run via the long- distance line FL ₁ , carrier Ue ₁ , group selector GW and the line

V The following has been indicated by the patent seeker as the inventor:

- ■ ■ - Dr. Fritz Lubberger in Berlin-Grunewald.

processing selector LW to the desired Qrtteilnehmer, z. B. the subscriber Tn. Behind the group selector GW there could of course be a few more dialing levels that can also be reached via connecting lines. For the sake of simplicity, however, it is assumed in the exemplary embodiment that the last selection step immediately follows the group selector GW. The identification ίο of the connections as local or through connections takes place in the group selector GW. In the exemplary embodiment shown, it is assumed that local connections run over the first decade and through connections run over the second decade of the group selector GW . Through connections can run in another direction over the third decade of the group selector GW , and through connections can run in a third direction in the fourth decade. So-called decade contacts (dK) are assigned to the decades of the group voter intended for through connections, which are closed at home: ore riches of the corresponding decade.

When the second decade of group selector GW is reached, contact 2dk is closed, when the third decade is reached, contact 3.dk, when the fourth decade '30 is reached, contact 4dk , etc. are closed. It is now: everyone for. Through connections provided- """" an auxiliary selector WH is assigned to a decade, which is activated according to the selected decade and via its switching arms who. until whe connects the calling line FL ₁ with the called line FL _{2 while the} connection is being established. The multiple signs shown on the lines leading to the voters poor wha to whe indicate the connection to the various decades. and thus the auxiliary dialers WH assigned to the different directions, via which the calling line is connected to the corresponding called line.

First of all, the switching operations when establishing a connection via the trunk line FLt with the subscriber Tn belonging to the local network will be described. When the long- distance line FL ₁ is occupied by the remote office, a short Weehseistronasturz · comes over the long-distance line Fi ₁₁ , which over the windings of the transformer Ue ₁ and the contacts -18fr and 31 δ the surge receiving relay. A of the group selector. GW excited. When relay A is energized, the following circuit is established for the delay relay. V. , formed: earth, winding of relay V, head contact 5 "k. Contact xa, battery, earth. After the end of the current surge, relay V releases with a delay; the following circuit for relay C is closed: earth, contact 16 v , winding of the relay C, resistance Wi, battery ground. this will relay C falls over its contact 9 c in an independent from the relay V hold circuit. Due to the subsequent number surges through which in turn the current impulse receiving relay a alternately energized and deenergized is Relay C is short-circuited intermittently by contact 17a, but it persists during a series of impulses. Since the connection with a subscriber in the local network is reached over the first decade of the group selector GW , the first series of impulses arriving via the long-distance line FL ₁ consists of only one The relay A responds once and closes the following circuit for the lifting magnet HG of the group selector GW: Earth, contacts Jp, 14c, του, na, winding of the delay relay U, winding of the lifting magnet HG, battery, earth. The solenoid lifts the; Switch arms of the group selector to the first decade. The relay U is energized in the circuit of the solenoid HG; after the end of the series of impulses, U drops out and closes the following circuit for relay H; Earth, contacts i.3, c, 12 u, head contact 73 k, which has closed after your first stroke step of the group selector GW , winding of relay H, battery, earth. Relay H responds and closes the following circuit for the rotary magnet DG of the group selector GW: Earth, contacts Tp, 14 ^ Zh ₁ & d, winding of the rotary magnet DG, battery, earth. The group selector GW turns a step. When the rotary magnet DG is excited, contact 6d opens and interrupts the circuit of the rotary magnet, the rotary magnet DG drops out, contact 6 c? closes the circuit for the rotary magnet = DG again. This game is repeated until the group selector GW _{turning in free Wa 1} U has found a free line in the selected decade. In the exemplary embodiment it is assumed that the line connected to the second contact of the first decade is free. If the group selector GW is on this Leitujig, the test relay P responds in the following circuits: Earth, contact 28 c, windings I and II of relay P ,. Switching arm c of group selector GW, winding I of relay C ₁ , battery, earth. Relays P and C ₁ respond in this 1x5 circuit. The relay P of the group selector GW interrupts the circuit for the rotary solenoid by opening the contact 7 p, thereby stopping the selector. By short-circuiting its high-resistance winding I by means of the Kaataiktes 29 ^, the test relay blocks in

known way the occupied line ¹ against., other occupancy; by closing the contacts 25 p and 26 p the "two speech wires to the line selector LW are switched through.

As already mentioned, the relay C _{1 of} the line selector LW also responds in the test circuit. Relay C ₁ is a step relay which is initially only excited in the first stage by winding I in the test circuit. It only closes its contact 48c and thus prepares the test circuit for the subscriber line to be called.

The number dialing now follows. To set the Leituagswählers L, the surge receiving relay A of the group selector G is again alternately energized and de-energized. Relay A transmits the

so current surges in the following way to the surge receiving relay A _{1 of} the line selector L: earth, contacts 24 a, 22 c, 25 p., 27 m, switching arm α of the group selector G, winding I of the relay A ₁ , battery, earth. The line selector is raised to the desired decade in a known manner. In the next series of impulses , the relay A _{1 of} the Leitangselfer LWi is again energized intermittently; the line selector turns on the desired subscriber line according to the power surges. The corresponding switching operations are irrelevant to the invention and are therefore not shown. If the desired participant Tn is free, the test relay P ₁ responds in the following circuits: earth, contact 48 C ₁ , windings I and II of the test relay P ₁ , switching arm c of the line selector LW, battery, earth. Relay P ₁ blocks the called subscriber line against other occupancy in a known manner by short-circuiting its high-resistance winding II by means of its contact 42P _1; the contacts 3Sp ₁ and 39P ₁ switch through the two speech wires to the called subscriber Tn. The contact 4Op ₁ creates the following circuit for the call switch relay i? formed: earth, breaker RU, contacts 4Op ₁ , 410O ₁ winding of relay R, battery, earth. The relay R applies the ringing current source WQ ₁ to the called subscriber line via its contacts 35 r and 36 r. If the subscriber now lifts his receiver, the feed bridge relay Y in the following circuits responds during a break: Earth, winding II of relay Y, contacts 37 η 39Pi, switching arm b of the line selector LW, subscriber loop TN, switching arm α of the line selector LW, contacts 38P ₁ , 34 ?, winding I of relay Y, battery, earth. When relay Y is energized, the following circuit is formed for relay B in group selector G : Earth, winding II of relay A ₁ , contacts 313), 33C ₁ , switching arm & group selector GW, contact 26p, winding of relay B, battery, Earth. Relay A ₁ does not respond in this circuit, but relay B is energized. The relay B switches the AC power source WQ to the windings of the transformer Ue ₁ through its contacts 19 b and 20 b and thereby sends a current surge backwards via the long- _{distance line FL 1} : as a sign that the called subscriber has reported. When the relay Y is energized, the following circuit is formed in the line selector LW for the second winding of the step relay C ₁ : earth, contact 453 ;, resistance Wi ₂ , resistance Wi ₁ , winding II of the step relais C ₁ , battery, earth. As a result of the upstream resistors Wi ₁ and Wi ₂ , the relay C ₁ responds with a significant delay. As soon as this has happened, however, the contacts 43 C _{1 and 44C 1} short-circuit the two resistors Wi ₁ and Wu ; the relay C ₁ now pulls through fully. By opening contact 3.3C ₁ , the circuit for relay B in group selector GfF is interrupted and the alternating current surge sent backwards via the long-distance line FL _{1 is ended.} When relay Y was energized, the following circuit was formed for call switch relay AB : earth, contacts 4Sc ₁ , 463 ;, winding of relay AB, battery, earth. The relay AB binds itself via its contact 47 from independently of the feed bridge relay Y and switches off the ringing current from the called subscriber line by opening the contact 41.

It should be noted here that during a local connection in the group selector, so in addition to the surge receiving relay A, yet the relay B together with the provided as a counterweight inductor Dr across the capacitor C (? _A is in bridge to the telephone line Hegt. In the line selector out of the feed bridge relay Y relay A ₁ ; winding I is directly on the α-wire, and winding II is a counterweight over the capacitor Co ₁ on the &-wire in the bridge to the voice line. The two feed bridge relays A in the group selector and T in the line selector separated from the other two bridges by the capacitors Co ₁ and Co _s or Co _n and Co _B.

If the subscriber hangs up his receiver after the call has ended, the feed bridge relay Y drops out. Contact 453 »opens the circuit for winding II of stage relay C ₁ . However, since winding I of relay C ₁ still carries current, the armature of relay C ₁ only slowly falls back from position 2 to position 1. The following circuit is again used for the

Relay B in group selector GW closed: .'End, windings II of relay A ₁ , contacts 303 ;, 32C ₁ , switching arm b of group selector GW, contact 26p, winding of relay B, battery, earth. The relay B closes its contacts 19 & and 20 & and thereby sends an alternating current surge via the transformer Ue ₁ and the long- distance line FL ₁ back to the calling office as a final signal.

When triggered, a long alternating current surge arrives via the long-distance line FL ₁ from the remote office, which excites relay A until relay C is short-circuited via contact 170 and caused to drop. When relay C drops, the group selector GW is triggered in a known manner. The switching operations are irrelevant to the invention and are therefore not shown. By opening the contact 28 c, the test circuit to the line selector LW is opened; The relay C _{1 of} the line selector LW also drops out completely and initiates the triggering of the line selector LW in a known manner. The circuits for this are also of no interest to the invention and are therefore not shown.

Let Him set up a through connection from a remote exchange via the trunk line FL ₁ , the transmitter Ue ₁ , the

■■ - "Group selector GW, the transformer Ue ₂ and the long- distance line FL _{2 described} to another remote office.

When the trunk line FL _{1 is occupied by} the remote office, a short occupancy current surge arrives via the trunk line JpL ₁ , as with a local connection, which results in the same switching operations as with a local connection. When dialing numbers, the same switching processes occur as they were already described when establishing a local connection. The series of current impulses for setting the group selector GW does not consist of a current impulse, but of two current impulses, since, according to the assumption of the local connections, the first, each through connection that goes to the trunk line JpL ₂ , the second decade of the group selector is available. If the group selector GW is set to the second decade, the decade contact 2dk is closed. Now, after the end of the series of numbered current impulses, in addition to the circuit already described for the rotary magnet DG of the group selector GW, the following circuit for the rotary magnet Dwh of the auxiliary selector WH is established : earth, contacts Jp, 14c, 8h, 6d, 2dk, winding of the rotary magnet Dwh, battery, earth . Both voters freely choose and continuously adjust to the same contact. It should be switched on here that the auxiliary selector WH is designed as a ten-part rotary selector with five switching arms. If the group selector CrWi has found a free long-distance line, eg the line FL _{2 shown} , the test relay P of the group selector GW and the occupancy relay C _{2 of} the transformer Ue ₂ respond in the following circuits: earth, contact 28 c, windings I and II of the relay P, switching arm c of the group selector GW, winding of the relay C ₂ , battery, earth. The relay P interrupts the circuits for the rotary magnets DG of the group selector GW and Dwh of the auxiliary selector WH by opening its contact Jp. In addition, the test relay P blocks the line found in a known manner against other occupancy by means of its contact 29 p; by closing the contacts 25 / »and 26 p , the" two speech wires are switched through.

From the remote office, further series of current impulses for setting the voters in the office now arrive via the long-distance line FL ₁ at the other end of the long-distance line FL ₂ . With every current surge, the surge receiving relay A of the group selector GW responds and closes the following circuit for the surge transmission relay A _{2 of} the transformer Ue ₂ : Earth, contacts 24a, 22c, 25p, -27m, switching arm α of the group selector GW, winding of relay A ₂ , battery , Earth. Relay A ₂ applies the alternating current _{source WQ 2} to the winding of the transformer Ue ₂ via its contacts SIa ₂ and 52 a ₂ each time it responds, and so transmits the direct current surges again as alternating current surges via the long-distance line FL ₂ to the remote office.

The desired subscriber in the remote office accepts the setting of the selector his handset in order for which the AC relay B ₂ comes in a similar manner as described Tn when reporting of the called a local call participant, an alternating current pulse via line FL ₂ back of the Transformer Ue ₂ excited in the following circuits: winding of transformer Ue ₂ , contacts 54 n, 50 a ₂ , alternating current ^relay B ₂ , lla contacts 53 a ₂ , windings of transformer Ue ₂ . The relay A in the group selector GW cannot respond to this current surge, since it is already too much weakened by the capacitors Co ₇ , Co ₈ or Co ₁ , Co _2. Relay B _{2 of} the transformer Ue ₂ Closes the following circuit for the relay B in the group selector GW: Earth, contact 49 b ₂ , choke coil Dr ₂ , switching arm b of the group selector

W, contact 26 p, winding of relay B, battery, earth. Relay B gives by switching on the AC power source WQ by means of its

Tgb contacts and 20 b to the windings of

■ Transmitter Ue ₁ the sign that the desired subscriber has reported, over the trunk line FL ₁ back to the calling office.

In the transformer UE ₂ upon energization of the relay · B _2, the following circuit is used for the slow-release relay stages G formed: earth contacts 65C _2, 64 ', 68 & _2, winding of the relay I G, battery, earth. Relay G responds in this circuit only in the first stage and only closes its contact 67 g ·. If the alternating current surge arriving via the long-distance line FL ₂ , which signaled the reporting of the called subscriber, is over, the relay B _% drops out, and the following circuit is now formed for the winding II of the relay G : Earth, contacts 65 C ₈ , 64 n, 66 b ₂ , 67 g, winding II of relay G, battery, earth. In this circuit, the relay Q now responds in the second stage. In addition to contact 67g, contact 62 g is now also closed, thus creating the following circuit for relay M : Earth, contact 61 0, switching arm whc of selector WH, contact 62 g, switching arm whd of selector WH, winding of relay M, Battery, earth. Furthermore, the following circuit for the relay N is closed: earth, Kontaktöi 0, SchaltarmwAc of the selector WH, contact 62 g-, winding of the relay JV, battery, earth. The relays M and N are connected to a holding circuit that is independent of the relay G via the contact 60 η. The relay G drops out shortly afterwards due to the opening of its circuit through contact 64η.

When the relay M is energized, the contacts 69 m and 70 m open and thereby separate the long-distance line FL ₁ from the capacitors Co ₁ and Co ₂ and the bridge formed by the relay B and the choke coil Dr; by closing the contacts 71m and 72 W, the long- distance line FL _{1 is connected} to the switching arms wha and whb of the selector WH and thus directly to the terminating transformer of the long- distance line FL ₂ . When the relay N was energized, the contacts 55 "and" 57 "were closed and

so that the transformer windings of the transformer Ue _{2 are connected} directly to the contacts of the selector WH . In the pass-through office, there is now only bridge relay A as a monitoring relay between the speech wires.

If the called subscriber hangs up his receiver after the call has ended, see above comes, similar to the local connection

. described, an alternating current surge via the trunk line FL ₂ , which now energizes the relay A. Relay A closes the following circuit for relay 0: earth, contacts 58 a, 59 m, winding of relay O ₁ battery, earth. The relay 0 interrupts the holding circuits of the relays M and N by opening its contact 61 0; the two relays drop out. When the relay N drops out, the contacts 55 η and 57 η are opened and the contacts 54M and 56η are closed. Since the alternating current surge is still ongoing, relay B ₂ is now also energized. Relay B ₂ closes, as already described, a circuit for relay B in the group selector GW. Relay B gives, as already described, by means of its contacts 19 & and 20 & the final signal over the long-distance line FL ₁ to the calling office. When the relay B _{2 of} the transformer Ue ₂ was energized, a circuit was formed for the winding I of the step relay G , as also already described; after the relay B ₂ has dropped, the winding II of the relay G is again energized. The relay G pulls through fully and again closes the circuits for the relays M and N, which bind after the relay G has dropped out via the contact 60 η. The previous speech circuit has now been restored.

The relay A had therefore served in this case to temporarily convert the switching devices of the through the Office of speaking state in a signal state, could be in which an incoming over the trunk FL ₂ signal passed back over the trunk FL. ₁

If the remote office at the other end of the line FL ₁ releases the connection after this final signal, an alternating current surge of a longer duration arrives via the long-distance line FL _1. This energizes RieJais A. Relay A closes the circuit for relay 0. Relay 0 interrupts the holding circuit for relays M and IV, which drop out. Since the tripping current surge is still ongoing and A is still excited as a result, relay A ₂ of transformer Ue * also responds. Since the contacts 65 η and 56 η are closed after the relay N has dropped out , the relay A ₂ , which connects the alternating current _{source WQ 2} to the winding of the transformer Ue ₂ by means of its contacts 510 ₂ and 52 a ₂ , the triggering current surge via the Transfer trunk line FL ₂ to the remote office called.

Relay A had therefore also switched the switching devices of the transit office from the speech state to the signal state in which the _{signal arriving from the trunk line JFL 1} could be passed on to the trunk line FL ₂ ^{when the 1} trigger signal was received via the trunk line FL _1.

In the group selector GW , relay A closes when it is excited by the

lösestroißstoß mittels'des · contact '17 a relay C as long short "that this- drops. The drop-out of the relay C initiates the triggering of the group selector GW in a known manner after the termination of the triggering current surge. The tripping circuit for the selector WH runs after the relay C has dropped out as follows: earth, contact 63 fr, contact segment and sehaltarm whe of selector WH, to self- breaker contact τζάΐι of selector WH, winding of rotary magnet Dwh, battery, earth. The voter WH rotates step by step until he has reached the rest position; is in which the circuit for the rotary magnet Dwh whe by the switching arm is interrupted.

Finally, it should be noted 'that that embodiment described above an arrangement with alternating current impulse delivery ao shows which the invention does not is limited. The invention can of course also be used in systems with direct current impulses Find use.

Claims (1)

Patent claims: ι. Circuit arrangement for telephone systems with several offices in series via which connections in different traffic directions are "established - turn, characterized in that - for connections in certain traffic directions switching means (2dk, WH, G, M, N) in the offices are so effective that of the switching means attenuating the speech currents (bridges: B, Dr or, B ₂ , capacitors Co ₁ , Co ₂ or . Co ₇ , Co _a ): in the speech circuit only one bridge relay (A) remains switched on and serves to transmit signals in the incoming and outgoing direction of the established connection. 2. Circuit arrangement according to claim i, characterized in that the switching means attenuating the speech flow during the production of the connection are in a setting path which, after the connection has been established, by means of the switching means (WH, M, N) which become effective for connections in a certain traffic direction special speech channel is replaced. 3. Circuit arrangement according to. Claim 2, characterized in that the special speech path runs via switching arms (Wha, whb) of a selector (WH) which, after identifying a connection in a certain traffic direction, is freely selected in step with the selectors (GW) lying in the setting path, 4. Circuit arrangement according to claim 3, characterized in that the switching means (M, N) are controlled via switching arms (whe, whd) of the selector (WH) , which after making the connection replace the adjustment path by a special speech path. 5. Circuit arrangement according to claim 4, characterized in that the circuit for the Sehaltmittel (M, N), which are controlled via the switching arms of the selector (whe, whd) , by a relay (G) brought into effect when reporting the desired participant is closed. 6. Circuit arrangement according to claim 5, characterized in that the relay (G) brought into effect when reporting the desired participant is designed as a step relay with drop-out delay, which at the beginning of the hang-up signal of the called participant over the one winding (I) in the first stage and after termination of the signal via a second winding (II) is excited in the second stage. 7.. Circuit arrangement according to Claims 5 and 6, characterized in that the circuit for the changeover relays (M, N) controlled via the switch arms of the selector is closed in the second stage when the step relay (G) is energized. 8. Circuit arrangement according to claim 7, characterized in that the changeover relays (M, N) are placed in a holding "circuit independent of the step relay (G) and open the excitation current circuit of the step relay (G). 9. Circuit arrangement according to claim ι and 10, characterized in that the bridge relay (A) located after the establishment of connections in certain traffic direction alone in the speech circuit is influenced by signal currents from both directions of the connection in the same way and by means of an auxiliary relay (O) the holding circuit of the Changeover relay (M, N) opens, where- «o is brought about by switching off the special speech path and switching on the original setting path in the existing connection path, 10. Circuit arrangement according to claim 9, characterized in that depending on the direction of the signal currents in the adjustment path switching means (A _t , B _s , B) are influenced in such a way that the signals are passed on in the desired direction. 617188 ii. Circuit arrangement according to Claim ι o, characterized in that after the transmission of signals in the device, the switching means (G, M, N) which, after the connection has been established, replace the original setting path with a special speech path, become effective again. 12. Circuit arrangement according to claim i, characterized in that the bridge relay (A), which is located in the speech circuit after the connection is made, serves to transmit the final signal in the device and to transmit the triggering in the opposite direction of the connection. 1 sheet of drawings