DE410668C - Circuit arrangement for telephone systems with separate adjustment and speech paths - Google Patents

Description

GERMAN EMPIRE

ISSUED
\ M MARCH 18, 1925

REICH PATENT OFFICE

PATENT LETTERING

- M 410668 CLASS 21 a GROUP

(S5 & IJ3 VHIjsia'J

Additional patent 400,377th patented in the German Reich on 24 November 1921..

Longest duration: June 18, 1938.

The main patent is a circuit arrangement for telephone systems with separate Setting and speech paths are described in which the speech path can only be selected using a preselector and connecting lines that can be reached by these are closed. The preselection is available for both outgoing and even with incoming traffic on the same contacts.

With this arrangement, the automatic connection of the ringing current to the leading to the required subscriber leads to considerable difficulties. At the When a subscriber calls, the selection assigned to him is placed on the contact a free connection line. In the case of another connection in which the subscriber is the called party, the selection must be set to the same contact set that it occupies for outgoing traffic would have.

The invention now aims to automatically call the requested subscriber even with systems of the type specified in the main patent to enable in a simple manner, what is achieved by the fact that before the setting of a building the speech path Dialer, e.g. the preselector of the called

Line on the connection line occupied by the dialer of the calling line automatically via a ringing current source common to a group of connection lines the dialer setting up the speech path or via the setting path to the called line is switched on. According to the invention, a speech path building up is expedient He is set to a special contact through which the call is being made desired line takes place. According to the invention, the rut power device can also be used in Linste.hveg be arranged. This creates the incentive to close the speech path only after transmission of the ringing current, via the adjustment path. , - - "

Two different embodiments of the invention are shown in the drawing.

In the Fig. Ι is a circuit arrangement shown in which the preselector assigned to the subscriber for the incoming traffic direction adjusts to a special contact through which the call from the subscriber is made. This is followed by the forwarding of the preselection, which now refers to the \ orwähl des calling subscriber sets the busy connection line and thereby the speech path voLends.

The operation is as follows: When calling the subscriber side Tn _1, the relay T is energized in the following way: earth, battery, contact 1, switching arm 2, windings II and I "of the relay T, Contact _3;, Core α of the subscriber line , Subscriber station, wire b of the Ί subscriber line, contacts 4, and 5 _Ä1 , earth. The relay T responds, opens its contact 6 _f and closes the circuit for the rotary magnet D at contact " _t detr: earth, contacts y _t and 8 _Ä , Rotary magnet D, breaker 9, earth. The selection "Maecht a step This leaves the ^{switching:..!} Arm 2 to the contact 1. Furthermore, the contact 8 is opened and the contact _k 10 _k Da closed through the contact 11 of the circuit of the relay T not main-;.: is obtained, "this falls off and closes the 'circuit of the drive magnet D again: earth, contacts 6 _t and fo _fo magneto,; Breaker 9, battery ,. Earth. If the 'preselector finds a free connection line VL, < , - SO: the following' circuit is established: earth, battery, contacts I2 _{gl and} i3 _c , relay C, contact 14, switching arm 2, winding II and I of relay T, contact 3 ^ Wire α of the subscriber line, subscriber station, wire b of the; ■ subscriber line, contacts 4 _t and 5 _el , earth. In this circuit, the Reiais C and T respond. The relay Γ opens at the contact 6 / the circuit of the Ant'triebsmagrieten D ₁ disconnects the relay T or the earth connected via contact 5 ^ ₁ from the subscriber line by opening the contacts 2> t and 4t and switches on the contacts ιζ ₍ -and i6 _t through the voice wires. At the contact y _t the winding I is short-circuited and thereby the occupied connection line is blocked against occupancy by another preselector.

Relay A , which is in a bridge to the voice wires, responds to the occupied connection line and, at its contact ij _a , closes the following circuit for a delay relay V: earth, contacts 17 _a and 18,., Relay F,, battery, earth. Reiais X , which is switched on one after the other with relay A , is not excited by the current via the subscriber line, since its two windings 1 and H are connected to one another. The relay V switches by opening its contact 19 ,, and closing its contact 2o _v battery via the resistors 21 and 22 to the relay C , whereby the blocking and holding circuit is maintained, despite the relay C its contact 13 ,. has opened. Furthermore, the following circuit for the starter relay of the first free caller AS of _{a EinsteJweges is closed at contact 23 V} : Earth, contacts 23 ,,, 24 /, 25 _S , 26 _fl , 2, ¹ J _n , winding I of relay R, battery, Earth. The relay R closes the circuit of the drive magnet D _{1 of} the call seeker AS as follows: Eide, contacts 2 & _tl , 2% (head contact of the Zehaer voter), 3o _r , 31 ^ ₁ , magic D ₁ , battery, earth. TTerner is prepared at the contact 32 _r the circuit for the P ruf reiais T ₁ , which comes about when the test arm 33 of the call seeker s comes to the contact to which the connection line occupied by the selection of the calling party is connected. If this is the case, the ReIaIsT _{1 is} excited in the following circuit: earth, contact 32 _r , windings I and II of relay T ₁ , switching arm 33, contacts 34, 3S _f and 36,., Winding I of relay S, battery , Earth. The two relays T ₁ and J respond. The relay T ₁ opens its contact 28 ^ and thereby interrupts the circuit for the drive magnet D ₁ . Winding II of relay R now lies one behind the other with magnet D _1. In this circuit, however, only relay R has been energized, while magnet D ₁ does not receive enough current to respond. The relay £ in the relay set of the connection line prevents further call seekers from being stimulated by the connection line occupied by the selection of the calling subscriber _{by opening its contact 25 S.} It should also be mentioned that the relay T _x through

Closing his contact ^ y _{n to} the stimulus line that the call seeker has switched over to the next setting path. .. ■. ~ -.

If the calling subscriber sends out Stronistoße to set the number current impulse receiver -des- setting path, the relay A is switched off in a known manner. ... It therefore opens with every interruption '.; the line sch.eiie ίο its' contact 38g and. closes the contact 39, J. whereby: “the current surges will be transmitted as follows: earth, contacts 3.9 ,, .- and; 40, t; Schaltärin 41, -. Contacts 42 _n ■ · and 88 /, -control relay Fr ₂ , contact 43 _B , '^ ⁿ "drive magnet-ö,. Of the decimal selector, battery. Earth. the decade dialer; Z> F is set to the decade to which the.required.participant ■; is connected. -..;; _.; ..;.; ...:. ...- ':; ■ · When setting the decimal dial wi.cd, contact 29I (ZW) is opened, but relay R is kept - - §chlossen \ .- \ _yird;: The "hold circuit: j ^ runs; as follows: earth, \ Vicklung II of the relay. R, -contact 329 ^ (ZW), resistor 330, battery, earth.

It should be mentioned here that as a voter - a voter was accepted - ... welr has more than ten sentences of KqntaktDÜrsten. Each contact brush set can be reached via a different contact of the ten selector ZW. For example, if the requested subscriber has the number 53, the cell selector is set to the fifth contact, to which the fifth contact brush set. of the single dialer "is connected. If the single dialer is then set to the third contact, line 53 is selected.

The control relay F ₂ is equipped in a known manner with delayed armature drop; As a result, it remains excited during the series of impulses and only starts when the contact 39 _{ß is} opened for a long time, whereupon it closes the following circuit: earth, contact 44 _V. ,,. head contact 45 _{A of} the ten selector ZW, changeover relay U, battery, earth. The changeover relay U switches see at its contact 46 _u in an independent of the contact 44 _V2. Haltestromkreis.:ein, also opens its contact 43 _B and "closes its contact 47, j, whereby the drive magnet D _{e is switched} into the pulse circuit via the head contact 48 ^ of the selector ZW at the position of the drive magnet D _z.

Immediately after setting the ten selector, a relay W is energized in the following ways: earth, battery ,. Resistor 49, contact 50p, resistor 51, contacts 5% and 53 _vii , peeling arm 54, contact 55, switching arm 56, contact 57, winding I of relay W, ground. The relay W opens its contact 5 "S ₄₁ , and closes its contact 59 ,,, .. If the control relay Vn is excited during ... the series of impulses to" set " the single selector EW , the relay remains W. also at home interruption of the circuit, .over., Its winding I and the normally closed contact 57 of the selector energized via its winding il: earth, contacts 6o _r and 59 ,,,, winding II of the relay W ,. Resistor 6r, battery, After setting the selector, relay V drops out again in a known manner and short-circuits winding II of relay W at contact 02 _y . As a result, relay W drops out Incentive of the y elector of the requested subscriber line, .'.-.... :

That. Re.aisJi is aroused in the following way; Earth, contacts 03 "64 ^ 6ζ _η . And 66 ^."'Relay - £, .battery, earth. The relay E closes; his contact 6γ _€ , whereby if the. common, .. continuously rotating,. besides the connection contacts 1 to 3 and 5 to 7 with a suitable number of empty contacts, e.g. the two contacts 4 and 8 equipped auxiliary switch H6 ¹ located on one of the contacts 1 to 3 or 5 to 7 is that: Relay HR is excited, which at its contact 68 _{ήΓ shoots} the circuit for a relay L : earth, contacts 68 / _ir and 69g, relay L ₁ battery, earth. The relay L opens its contact 52 ^ and closes its contact 70 ;, whereby the relay P is switched on to the ■ ^: wire c ' .

In the meantime, by closing contact 58 ,,, the dialer of the requested subscriber line was stimulated to adjust to the first contact too. -. For the sake of simplicity, only one voter has been shown. The relay T of the preselector of the requested subscriber is energized as follows: Jirde, contacts 6o _r and 58 ^, switching arm 71, contact 72, switching arm 73; Contact 74, line 75, windings I and II of relay T, switch arm 2, contact 1, battery, earth. When the Y'or selector reaches the first contact, ie the switching arm 2 is on contact 11, the following circuit is closed: earth, battery, resistor 49, winding I of relay P, contacts 70; and 53v2) switching arm 54, contact 55, switching arm 56, contact 76, wire c ', winding III of relay T, contact 11, switching arm 2, winding II of relay T, contact j _t , earth. The relay T remains energized and thus prevents the preselector from continuing to run. A ringing current source common to a group of connecting lines is connected to contacts 77 and 78. As soon as

first step of the preselector the contact arms 79, 8o have reached the contacts 77, 78, ringing current is switched on to the subscriber station to be called as follows: ringing current source, contact yy, switching arm 79, contact 15 ^ wire α of the subscriber line, alarm clock of the subscriber station, wire b the subscriber line, contact i6 _t> switching arm 80, contact 78, back to the ringing current source. Relay P has short-circuited its winding I by closing contact 8i _{p and established a holding circuit at contact 82 p} via its winding II: earth, contacts 83,., & 2 _p and 84;, winding II of relay P, battery, Earth.

If the auxiliary switch HS comes to one of the empty contacts 4 and 8, the circuit for the relay HR is interrupted. As a result, the relay L drops out, which by opening the contact 70; interrupts the circuit via the wire c ' and the winding III and II of the relay T and by opening the contact 84; the short circuit of the relay Q cancels. The relay is responsive to Q and applies directly to the battery contact 14 of the \ ^r Getting Connected line via its contact 8> 5q and the switching arm 86 .and contact 87 at. By interrupting the current via the relay T , the drive magnet D was switched on again in the preselector of the required line, which now looks for the connection line occupied by the preselector of the calling line _: As already mentioned, this connecting line is characterized in that the battery is connected to contact 14 at 85 ^.

This arrangement ensures that the \ ^? elector of the selected participant. is only forwarded from the call position after a certain time has elapsed. By faster or slower running .of \ auxiliary switch HS or greater; or a smaller number of empty contacts, the time during which the preselector remains in the call position can be adapted to the respective conditions.

Setting the selection to a free trunk is by excitation; a blocking relay G ₁ prevented, which was switched on by the relay Q 1 as follows: earth, contacts 63 _r , 04 _U 87 ^, relay G ₁ , ■ battery, earth. The relay G ₁ has switched off all connecting lines by ■ opening its contact I2 _{gl battery.} It also prevents the activation of the preselector of a calling line, since _{all connection lines at contact 5 W} earth have been switched off.

In addition to the switching operations already explained, the relay L has closed the following circuit when responding: Earth, battery, winding II of relay S, contacts 38 _O and 40, switching arm 41,. Contacts 42 ^, 89 ;, 9O _P , gi _q , switch arm 92, contact 93, winding I of relay F, earth. In this circuit, the relay F can only respond when the requested subscriber line is busy, ie the relay P after the contact 70 is closed; can not respond. If the subscriber line is free, the contact 90 ^ is interrupted by the responding relay P before the relay F can attract its armature.

If the relay Q responds during the establishment of the speech path, it opens the contact ' 9I ₁₇ and closes the contact 95'. As a result, the relay P is excited via its winding I and opens its contacts 24 / and 35 ,. As a result, the relay T _{1 of} the caller is de-energized, which by closing 'its contact 28 ^ short-circuits the winding II of the j relay Pv. The relay R opens its contacts 83 ,. and 63,., whereby the circuits for the relays G ₁ , P and Q are interrupted. The relay G _x closes its contacts 5 _Ä1 and I2 _Ä1 . It thereby removes the blocking of the free connection lines: and enables by switching on the! Ground to the subscriber lines the setting of the selection of calling subscriber lines to free connection lines. The relay Q interrupts the circuit via the winding I of the relay P, which has switched on via its winding II in the following holding circuit: earth, contacts g6 _f , g7 _vll winding II of relay P, battery, earth.

The drop in relay T ₁ in the caller also triggers the selector of the adjustment path. First the single selector is switched to the rest position because the rotary magnet De is excited in the following circuits: earth, contact 98 ^ ₁ , head _{contact 99 fe of} the decimal selector> ZW, contact 10O _n ,, self-breaker contact ioi ^, magnet De, earth. When the single selector reaches its rest position, the relay W is excited via its winding I: earth, battery, resistor 49, contact So ₀ , resistor 51, contacts $ 2 _t and 53 _V2 , switch arm 54, contact no 55, switch arm 56, contact 57 , Winding I of relay W, battery, earth. The relay W responds and closes its contact 102 ,,,. The relay W works as a result of the short-circuiting of its winding II through the contact 62p as a delay relay. Contact io2 “remains closed until the ten selector has reached the rest position. The rotary magnet Ds of the decimal selector is excited in the following circuits: Earth, contact iao 98 (J ₁ head contact gg _{kz of} the decimal selector ZW, contact iO3 _tt "self-interrupting contact

^Ι0 3ίίζ> rotary solenoid Ds, battery, earth. When the ten selector reaches its rest position, the contact 99 is opened and thereby the circuit of the magnet Dz is interrupted.

After setting the selection of the requested subscriber line to that of the selection The subscribers can use the connecting line occupied by the calling subscriber line talk to each other.

The selected preselector is triggered when both participants have hung up their receivers and the relay V is de-energized as a result. As a result of the battery being switched off at contact 20 _v , the circuit for the relay T of the two preselectors set on the connection line is interrupted. The preselectors return to their rest position, as the circuit of the drive

ao magnets over, the contacts 6 _t and io _{fe is} closed. Reach the selection. Rest position, the circuit for the magnet D is interrupted by opening the contact io _fc .

In Fig. 2 an embodiment is shown in which the ringing current is connected to the desired subscriber line via the setting path. When the subscriber Tn ₁ calls, the relay R in the preselector VW responds in the following ways: earth, battery, head contact 20 i _k > relay R, contact 202 _f , α-wire of the subscriber line, subscriber station, & -wire of the subscriber line, contacts 203 ^ and 204 ^ earth. The relay R closes its contact 205 ,. and thus excites the rotary magnet D: earth, battery, contacts 20i _A , 205 ,. and 206 ;, magneto, breaker 207, earth. After completing the first step, the circuit of the rotary magnet D is maintained via the contacts 208.5 and 2o6 _£ . If the preselector finds a free connection line VL, the following circuit is established: Earth, battery, contacts 2o8 _Ä and 205,., Winding I and II of relay T, switching arm 209, contact 210, winding I of relay C, contacts 21 i _v , 2i2 _c and 2i3g, earth. The relays C and T respond. The relay T interrupts the circuit of the drive magnet D at contact _{2o6 t} , blocks the connection line found by closing contact 2-i4f as a result of a short circuit in the high-resistance winding I of T against occupancy by another preselector, and switches the at contacts 2i5 _f and 2i6 _t Speech veins through.

Speaking on the connecting line VL

after switching through the telephone line to the relay A, which at its contact ζιγ _α includes the following circuit for the delay relay V: earth contacts 2i7 and _a relay V, battery, earth. The relay V closes its contacts 219 ,,, 22O _v and 221 "and opens its contacts 21 i _v and 222 _V.

When it responded, relay C _{had contacts 2i2 c} and 223 ,. open and contact 224 _C closed. The blocking and holding circuit now runs through winding I of relay Γ and through contact 22i _v and resistor 225.

By closing the contact 219 ,, the following stimulus circuit for the call seeker AS of a free adjustment path was closed: Earth, battery, winding HI of relay C, contacts 2 ig _v , 226,., 227 _f and 228 _f , relay R ₁ , Head contact 229 ^, contact 230 ^, 7- ^e earth. The relay R ₁ responds and closes the circuit for the drive magnet D ₁ at contact 231 ^ ₁ : earth, contacts 230 ^, 229 ^, 23 i _m magnet ^, interrupter 232, battery, earth. If the call seeker AS finds the stimulating connection line VL, the relay T _{1 is} excited in the following way: earth, contact 233 _rl , windings I and II of relay T ₁ , switching arm 234, contacts 235, 2277, 22Ö _S and 2i9 _v , winding III of relay C, battery, earth.

The relay T ₁ blocks the connection line found by closing the contact 236 ^ against occupancy by another caller, interrupts the circuit of the drive _magnet D ₁ at contact 2θ8 ίχ and brings the setting magnets H and D ₂ depending on the closing of contact ^{2 37ίι} Impulse contact 238 ^. If the calling subscriber station sends out current impulses to set the line selector LW ₁ , the lifting magnet H is activated as follows: Earth, contacts 23S ₀ and 239, switching arm 240, contacts 237 ^ and 241;, relay V ₁ , contact 242, ,, Magnet H, battery, earth.

The relay V ₁ remains energized during the entire series of current impulses due to its delayed armature drop. It drops out if contact 238 ,, remains open for a long time, and then closes the following circuit for relay U: earth, contacts 243 _V1 , 244 ^, head contact 245 ^, relay U, relay L winding I, battery, earth. In this circuit only the relay U responds, which turns on by closing its contact 246 in a _{holding circuit independent of the contact 243 V1} and the shaft contact 244 ^. Furthermore, contact 247 _{B is} opened and lifting magnet H is switched off at contact 242 ^ and rotary magnet D _{2 is} switched on at contact 248 _B. The second series of impulses affects the magnet D ₂ , whereby • the line selector is set to the contact of the required subscriber line. If the relay V ₁ drops out after the end of the series of impulses, the relay U

via .the contacts 243 _V1 and 249, ^ short-circuited and the relays L and E energized: earth, contacts 243 _W , 249 ,,, and 250 ,,, relays E and L, battery, earth. Both Reiais respond. The relay L closes its contacts 251 _; and 252j and opens the contact 253 ;.

The relay E opens the contact 254 ,, and closes the contact 255 _e . . A continuously rotating toggle switch HS is assigned to all setting paths. If after the relay T _{1 has} responded when setting the caller the auxiliary switch HS to the switched on. Contact 256 assigned to the adjustment path comes, a relay 0 is energized as follows: earth, battery, switching arm 257 of auxiliary switch HS ₁ contact 256, relay. 0, contact 258 ^ earth. The relay 0 switches itself on at contact 259 ,, in a holding circuit and closes its contact 26o _o .

When the subscriber line is free, the relay P responds after the contact 251 / is closed by the relay L in the following way: earth, windings I and II of relay P, contact 251 ;, switching arm 261, contact 262, line c ', contact 264, switching arm 265 , Winding II and I of relay T ₂ , contact 266 / ,,, battery, earth. The relay P responds and shoots its contacts 267p, 269 ,, and 287 ^. The .Relais T _{2 of} the preselector of the required subscriber line interrupts its contacts 263 ^, 27o _i2 and 27i _i2 and closes its contacts 272 _i2 , 273 _i2 and 274 _i2 . The ringing current is now transmitted in the following way: ringing current source, contacts 276 on the common auxiliary switch HS, relay JV, winding I, contacts 255g, 277 _V1 , 207 _P , switching arm 278, contact 279, line 28o, α-wire of the subscriber line, subscriber station, & -Ader of the subscriber line, contact 273 ^, switch arm, 281, contact 282, earth. If the desired subscriber answers during a pause in the call, the relay JV is excited via its winding I, since the battery is connected to the relay JV via the contacts 283 or 283 '. , The relay A ^r responds and switches itself into a holding circuit via its winding II: earth, contacts 284 _V1 , 285 ^ ₁₆ and 286 _Π , winding II of relay JV, battery, earth. Relay JV interrupts the circuits for relays L and E at contact 25o. Relay L closes a circuit for cut-off relay G: earth, contacts 287 ^ and ^! 288 ,, Relay G, battery, earth. The relay G \ prevents the setting of the selection calling subscriber lines by opening the contact 204 _g and also turns on Kontakt213g earth from all free connects ·-making lines VL from. In addition, relay L at contact 25I ₁ interrupts the circuit for relays P and T ₈ . The relay T ₂ drops out and now closes the following circuit for the relays R ₂ and F: earth, battery, contact 266 _έ , relay R ₂ , contact 263 ^, line 280, contact 279, switching arm 278, contacts 207p, 277 _W and 254 ,,, switch arm 289, contact 290, relay F ,. Winding. I, earth. The relays R ₂ and E respond. The relay R ₂ . closes the circuit of the drive magnet D ₃ at contact 29 i _r2 . The selection of the

required subscriber line now arises; more in the usual way on the connection line occupied by the preselector of the calling subscriber line, since only this has been brought into a ready-to-test state! is. In the adjustment path of the contact 292 ^ through the relay winding E III was switched on the relay P to the c-wire of occupied by the selection of the calling subscriber line connection line reasonable \ after closing: earth contact 258 ^, winding III ■. of relay P, contacts 269 ,, and 292 ^, switching arm 293, contact 294, contacts 210, 210 'der '. Selection VW, VW. The winding of the relay P III is such niedrigohmig that the test relay ER of a seeking ^preselector: is excited, nevertheless already from the test; relay of a set preselector, a blocking and holding circuit has been closed. go

It should also be mentioned that the responding relay F, in the relay set of the connecting line, opens contacts 227 / and 228 / and has switched itself on at contact 295 _f in a holding circuit: earth, winding I and II of relay F, resistor 296, Contacts 295 /, 220 _S and 219 ,,, Relay C ₁ winding III, battery, earth. By opening the contact 227 of the circuit for the relay T ₁ was interrupted, which at its contact 230 ^ the circuit for the tripping magnet M of the line selector includes: ground contacts 230 ^ and 297 ^ ,, magnet M, battery, earth. The line selector LW ₁ is triggered. The relay T ₁ has also opened its contacts 25 8 _tl and 237 ^ and thereby the holding circuits of the relays P and 0 interrupted. The occupied adjustment path is now free for other connections. no

The set preselector is triggered when both participants have hung up their receiver, by de-energizing relay V ₁ which opens _{its contact 22i v.} Since the relay C is formed as a delay relay, the contact 2 i2 remains _c still open for some time, so that the relay T and T _'a their excitation lose and at the contacts 2O6 _t and 2ji the circuits _ti of Äntriebsmagneten D and D ₃ include . .

It has already been mentioned that after setting the call searcher to a connection

the relay O has been energized. If the desired participant answers within a certain time, e.g. B. after three calls, if the switching arm 300 of the auxiliary switch HS ^{comes to contact 3 O1} during its second cycle, the following circuit is closed: Earth, switch arm 300, contacts 301, 26O ₀ , 252 ;, relay L, Winding II, relay JV, winding II, battery, earth. The relay JV responds and occasioned by opening of the contact ² 5 ° n the Stromloswerden the relay L and E. The two sloping relay L and E induce in the described manner, the setting of the preselector of the desired subscriber line to the area occupied by the selection of the calling subscriber line Connection line, whereupon the step-in path is triggered.

If the requested subscriber answers shortly after the last call, e.g. B. after the third Call, the two participants can still talk to each other.

Claims (10)

Godfather t-An sayings: i. Circuit arrangement for telephone systems with separate setting and Speech paths according to patent 400377, characterized in that prior to the setting of a speech path establishing Voter, e.g. B. the selection of the called line, occupied by the dialer of the calling line Connection line automatically one of a group of connection lines common Ringing current source connected to the called line via the dialer building up the speech path or via the adjustment path will. 2. Circuit arrangement according to claim i, characterized in that after the free checking of the required line, a dialer building up the speech path, for. B. the selection of the called line is set to a set of special contacts (11, yy, 78) via which the call of the requested subscriber is made. 3. Circuit arrangement according to claim ι and 2, characterized in that the setting of the selector, for. B. the preselector, influencing switching means (relay T) are so dependent on switching elements (relay L) of the adjustment path that after a certain time, the further switching; of the voter, e.g. B. the selection, for the purpose of ^: .Closing the speech path takes place. 4. Circuit arrangement according to claim 2 and 3, characterized by a constantly rotating auxiliary switch (HS in Fig. 1), which during part of its circulation by switching on the relay (L) dependent on it, the relay influencing the setting of the dialer of the subscriber line to be called ( T) keeps energized in order to prevent this dialer from continuing to run while the ringing current is being sent, and during another part of its circulation by de-energizing the aforementioned relays (L, T), the dialer of the called subscriber line continues to move in order to find the dialer of the calling subscriber line occupied connection line allows. 5. Circuit arrangement according to claim i, characterized in that the Ringing current device, e.g. ringing current source on contact (276) in Fig. 2, in the adjustment path is arranged. 6. Circuit arrangement according to claim 5, characterized by such a design of the closing of the speech path causing the adjustment path associated switching elements (relays E and L) that the incentive to adjust the speech path selector (VW) is given only after the ringing current has been sent. 7. Circuit arrangement according to claim 5, characterized in that all adjustment paths are assigned a common call device (Hiifs switch HS in Fig. 2). . 8. Circuit arrangement according to claim 7, characterized in that the common call device (HSJ dominates the closure of the speech path (by energizing the relay JV and thereby de-energizing the relays £ and L). 9. Circuit arrangement according to claim 7, characterized in that the common call device (HS) causes the triggering of the adjustment path (energizing the relay JV), if the desired participant is not within a certain time, for. B. after three calls reports. 10. Circuit arrangement according to claim 9, characterized in that the common calling device (HS) causes the speech path to be closed even if the requested subscriber does not report before the setting path is triggered. For this purpose 2 sheets of drawings.