DE641628C - Circuit arrangement for telephone systems - Google Patents

Description

GERMAN EMPIRE

ISSUED ON FEBRUARY 8, 1937

- GERMAN PATENT OFFICE

PATENT LETTERING

CLASS 21a ³ GROUP 54oi

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

Circuit arrangement for telephone systems

Patented in the German Empire on June 15, 1932

The invention relates to a circuit arrangement for telephone systems with subscribers with different traffic authorizations and switching of high-quality connections to participants without the involvement of a civil servant. For such systems it has already been proposed to switch a high-quality four-connection to a subscriber who is not • authorized for such connections to prevent and cause the connection to be released. The participant reached via the high-quality line, who is not informed of the reason for the release is therefore forced to use the To re-establish the connection.

The invention aims to overcome this disadvantage

. to eliminate, 'and this is achieved by the fact that, when a transfer incentive takes effect, the transfer of the existing high-quality connection takes place regardless of the traffic authorization of the call station called in the inquiry and is influenced by this switching means (relay Tr) , which is influenced if the newly connected station is not authorized only prevent speech communication with the intercom station reached by taking over the connection, so that the unauthorized intercom or an officer can arrange for the high-quality connection to be taken over by another intercom (authorized subscriber, officer).

Due to the arrangement according to the invention, there is the possibility that the high-quality Connections unauthorized participants take over the connection arrange for an authorized participant or a civil servant to do so Forward connection to a call station authorized for high-quality connections can. .

An exemplary embodiment of the invention is shown in the drawing.

It is a private branch exchange in which house connections are established in a known manner via call seekers and line selectors, while a secondary party when establishing an exchange connection after setting the call seeker to the calling subscriber by pressing a button initiates the setting of the exchange line dialer AW assigned to the exchange line . Incoming exchange calls are ■ accepted by an officer and forwarded to the desired subscriber by setting the exchange dialer AW.

House connections

If the subscriber N shown in the drawing wishes to speak to another subscriber in the private branch exchange and lifts his receiver for this purpose, the following circuit is closed: Erdey Kon-

*) The patent seeker stated as the inventor:

Johannes Stich in Brieselang, Osthavelland.

clock 1 1 via the subscriber loop of subscriber N ₁ contact 2 1, winding I of the relay / ?, relay on, battery, earth. In this .. circuit first the relay R net speaks the contact 37- and closes the clocks 4 r and 7 r. By. the latter is identified by the calling subscriber on the switching arm of the call seeker AS. The relay Ali connects the contact 8 , so that the relay B is energized via earth, contact 8 to, relay B, battery, earth. Through relay B ' the rotary magnet D of the caller AS receives current surges from the relay interrupter RU ₁ via earth, relay interrupter RU _i} contacts9δ, ιορ, rotary magnet D, battery, earth. The call seeker AS is now advanced until the following test circuit is established: Earth, winding I and II of relay P ₁ contact 11 b, switching arm c of the ao call seeker AS in the caller's position, contact 7 r, winding II of relay R, Contact 4 r or S t, winding II of relay T, battery, earth. In this circuit, the relay T responds once, opens the contacts 1 1, 2 1 and closes the contact 6 1, whereby the call current circuit is interrupted. Contact 5 1 is also opened so that the test circuit only runs over contact 4 r. In the test ^{circuit, the relay / 3} also responds, which interrupts the circuit of the rotary magnet D of the call seeker AS at the contact ι ο ρ. Furthermore, winding II of the relay P is short-circuited at the contact 12 ρ and thus the calling subscriber is blocked in a known manner. Relay P also closes contact 13 p, so that the following circuit is established for relay //: Earth, contacts 14V ₄ , 150, 16p _1; 13p, relay //, battery, earth. The relay // responds and switches the speech lines through to contacts 17 A and 18 A. By closing the 19 A contact, the test circuit is maintained regardless of the lib contact. After switching through to contacts 17 A and 18 A, the calling subscriber receives his feed current via earth, battery, winding II of relay X, winding II of relay A ₁ contacts _{20P 1} , 17A, switching arms of caller AS via the subscriber loop, switching arm b of the caller AS, contacts 18 h, 2Ip ₁ , winding I of relay A, winding I of relay X, earth. In the aforementioned circuit, only relay A responds; the relay X is a differential relay and is only influenced by pressing the Ta key on the intercom. By closing the contact i $ oa relay V _{4 is} energized. The short circuit for relay C at contact 15a is also canceled by relay A; the relay C responds and closes the contact 22 c, so that after the response of relay V ₄ and thus opening of the head _{contact 14V 1,} the circuit for the relays C and H ^ via earth, contact 22 c, relay C, winding I,; «| Äbntakt 13 p, relay H, battery, earth runs.

: 'The line selector LW is set to the desired subscriber in a known manner. If the desired participant is free, ReIaIsP ₂ responds in the test circuit of the line selector LW via the switching arm c . The ReIaIsP ₂ blocks the called subscriber in a known manner by closing the contact 23 p ₂ . Furthermore, by closing the contacts 24 ^ ₂ and 25 /? ₂ the feed bridge, consisting of the relay Y, is switched on for the called subscriber. If the subscriber answers after a call, relay Y will respond . The participants are now connected to each other.

If the calling subscriber picks up his receiver after the connection is closed, relay A drops out, relay C 8g short-circuits at contact 15 ″, so that relay C also drops out. Relay C opens contact 22 c, so that the circuit of relay H is interrupted. Relay H opens the circuit at contacts 17 A and 18 h, and also the test circuit of the call seeker at contact 19 h. When the test circuit is opened, the relays P, R and T drop out. By hanging up the receiver of the called subscriber, the feeder bridge relay Y drops out. The return of the line selector LW to the rest position is brought about in any way when the relay C drops. All switching means that have been used are thus again in the rest position.

Outgoing trunk connections

If the subscriber N wishes to establish a connection with the exchange, the call seeker will adjust to the calling subscriber in the manner described when the receiver is picked up. Once the contacts 17h and 18A have been switched through, the subscriber / V presses the Ta button, which energizes the differential relay X in the supply circuit of the calling subscriber. The relay X closes the contact 26 x, whereby the winding I of the relay X is short-circuited and thus the relay X remains energized even after the button Ta is released, since only the following current loop exists over the winding 11 of the relay X : earth, battery, winding II of relay X, winding II of relay A, contacts 20/7 _X , 17 h, switch arm α of the call seeker ÄS via the subscriber loop, switch arm b of the call seeker AS, contacts

i8h, 21 P ₁ , winding I of the relay ^ contact 26X, relay An ₁ , earth. Relay AT also opens contact 27 χ and closes contact 2Sx _1, which prepares a circuit across winding II of relay C and switching arm d of caller AS .

It should be noted that the contacts on

Shifting of e Anrufsucbers AS for outside

. authorized subscribers are provided without ground potential, while the subscribers not authorized for trunk connections have this ground potential. So if the calling subscriber is a subscriber who is not authorized for exchange connections, when an exchange connection is identified (pressing the Ta key), the reverse winding of relay C via earth, switching arm e in the position of the subscriber who is not authorized for exchange connections, contact 28 x, Winding II

ao of relay C, battery, earth energized. The reverse winding of relay C causes relay C to drop out, thereby triggering it in the manner described.

However, if the calling subscriber is authorized to establish exchange connections, the circuit for the reverse winding of relay C does not come about when an exchange connection is identified. Rather, through ReIaIs ^ ZZ ₁ and thus the closing of contact 2g UfI _1, a stnom circuit becomes. for relay R _x closed, which is connected to earth,. Contact 29 UtI ₁₁ relay .R ₁ , battery, earth runs. Relay / ^ closes contact30 r _1; so that the rotary solenoid D _{1 of} the exchange dialer AW is operated via earth, relay interrupter RU ₁ , contacts 30 / ^ ₁ , 31/73, rotary solenoid D ₁ , battery ^ earth. The public dialer AW is advanced by the rotary magnet D ₁ until the following circuit for the relay P ₃ is established: Earth, contacts 32. «, 33T ₁ , winding IV and III of relay P ₃ , contact 34. ti, safety arm d of the exchange dialer AW in the position of the calling subscriber, contact 28 x, reverse winding II of relay C, battery, earth. The reverse winding of the relay C causes the trip in the manner described. After the relay H has dropped out and the contact 19 h has opened , the following blocking circuit can be established via the switch arm c of the exchange dialer AW : Earth, contacts 43 u, 42 V ₁ , 44 p ₃ , winding I of the relay / ³ ;., Switch arm c of the exchange dialer AW in the position of the calling subscriber, windingII of the relay / ?, contact4 / -, windingTI of the relay T, battery, earth. Relay P ₃ switches the exchange line through to contacts 36/73 and 37773, so that the feed bridge relay <S is excited in the following circuit: Earth, battery, winding I of relay S, winding I of relay X ₁ , contact 36 / 73, switching arm α of the exchange dialer AW in the position of the calling subscriber, line 38 via the subscriber loop, line 39, switching arm b of the office selector AW, contact 37 p ₃ , winding II of relay X ₁ , winding II of relay 5, earth. The relay 5 opens the contact 40 s and closes the contact 415, so that the short circuit of the relay F _{1 is} canceled and a circuit for this relay via earth, contact 41s, ReMsV ₁ , battery, earth is established. The relay F ₁ closes the contact 42 V ₁ , so that now the winding II of the relay P ₃ via earth, contacts 43 ti, 42V ₁ , 44 p _& short-circuited 'and thus the calling subscriber is blocked in a known manner. Relay F ₁ switches the exchange line through to contacts 45V ₁ and 46V ₁ . If the subscriber sends out series of current impulses in order to set the voters in the public exchange, these current impulses are transmitted to the exchange line by relay 5 at contact 47 s. When relay 5 drops for the first time, relay V _{2 is} connected to earth, contact 48 V _1,. Relay F ₂ , contact 40 s, battery, earth brought into effect 'and remains energized during the entire series of impulses. Relay F ₂ opens contacts 49 V ₂ and 50 V ₂ and closes contact 51 V ₂ , creating a perfect impulse loop.

Once the connection units have been set in the public exchange, the four-way connection with the desired subscriber is established. If the subscriber / V hangs up his receiver after this connection is terminated, the relay S is de-energized and the ReIaIsF ₁ too short-circuits at the contact for 40 s. ReIaIsF ₁ opens the test circuit at contact 42 V ₁ , so that relay P ₃ and relays R and T are also de-energized. All switching means are thus in the rest position again.

Incoming trunk connections

If an external call comes in, a call signal for the officer is switched on by the call relay AR in a known manner. The officer then presses the AT key assigned to the exchange line, which energizes the relay ^ 45 of the calling exchange line. Relay AS opens contacts 5 2 äs and 53 #s and closes contacts 54 * zs' and 55 <zs. As a result, the calling trunk line AL is connected to the civil servant apparatus BA . The officer accepts the request of the calling participant. For the purpose of setting the public line voter AW to the subscriber desired by the office, the civil servant is equipped with an impulse transmitter,

Consisting of two switchgear DZ and DE, equipped, -which generate current surges for the purpose of setting the one-dialer EW and ten-dialer ZW assigned to the exchange line. It is assumed that the desired subscriber has the number 23. Accordingly, two current impulses are to be sent out first, which set the ten selector ZW to the second contact, and here after three current impulses, which adjust the single selector EW to the third contact. For this purpose, the officer first presses the key labeled 20 in the row of keys ZT and key 3 in the row of keys ET. After that, she actuates a common start button G, whereby the relays I and II are energized via earth, button G, relay I and II, battery, earth. Through the relays I and II, the contacts 561 and 57 II are closed, so that the rotary magnet DZ of the switching mechanism DZ current surges from. Relay interrupter RU _S via earth, relay interrupter RU 3, rotary magnet DZ, contacts 561, 57 II, 58III, battery, earth receives. The rotary magnet is actuated. After this has received two current surges and the switching mechanism DZ is set to the contact indicated by the button 20, the relay III is eraegt. This opens the contact 58 III, so that the circuit for the switching magnet DZ is interrupted. The shocks received by the solenoid DZ are transmitted via earth contacts 59 ^ 2, 60 as, solenoid ZW of tens selector ZW, relay V, battery, earth. The ten selector also receives two current surges, whereby the ten selector ZW is set to the contact labeled 2. During the series of impulses, relay V is energized and thus contact 78 v. After the relay III has responded, the rotary solenoid DE now receives current surges from the relay interrupter RU $ via earth, relay interrupter RU ₃ , rotary solenoid DE, contacts 611, 62 II, 63III, 641V, battery, earth. The switching magnet DE now receives current surges until the switching arm of the switching mechanism DE has reached the contact indicated by button 3, in which case the rotary magnet DE has received three current surges. When the switching arm of the switching mechanism DE has reached position 3, a circuit for relay IV is established and interrupts the circuit for * switching magnet DE at contact 64IV. The three current surges that the rotary magnet DE has received ■ also be transmitted via earth contacts 65 de, as, switching magnet One voter EW, battery, earth to switching solenoid EW that sets the one voters on matters dealt with three contact. As soon as relay IV is energized, the following circuit is established for winding III of relay U : earth, contacts 67III, 68IV, winding III of relay U, contacts 69 es, 78 pd, battery, earth. Through relay U the rotary solenoid D ₁ receives current impulses via earth, relay interrupter RU ₁ , contacts 70 pr, 7111, rotary solenoid D ₁ , battery, earth. The rotary magnet D ₁ is now switched on until a circuit for the relay PR is established. This circuit comes about when the switching arm e of the exchange dialer AW has reached the contact marked 2. The circuit then runs via earth, contact 72a, relay PR, switching arm of the decimal selector Zw in position 2, switching arm e of the exchange dialer AW in position 2, winding II of relay PR, battery, earth. The relay / ³ /? holds itself via earth, contact 75 / w, head contact 76 kzw of the ten selector ZW, winding II of the relay Pr, battery, earth. Relay PR interrupts the circuit for the rotary magnet at contact 70 pr. After the relay PR has responded, the rotary solenoid D ₁ is switched on via earth, relay interrupter RU ₁ , contacts 7 3 pd, 7 $ pr, rotary solenoid D ₁ , battery, earth. At the same time, the switching magnet EW of the selector EW receives current surges via earth, relay interrupter RU ₁ , contacts 11S pd, 116 pr, switching magnet EW, battery, earth. The rotary magnet D ₁ and the switching magnet EW are thus switched on together until a current circuit for the relay PD is established. This circuit runs via earth, contact 77 V ₁ , winding I of relay PD, switching arm of switching mechanism EW in position o, winding II of relay PD, battery, earth. The relay PD interrupts the circuit for the rotary magnet D ₁ at contact 7 3 pd and the circuit for the switching magnet EW at contact 115 pd. The single dialer EW , since it is set to contact 3 by the impulse transmission of the officer, will receive seven current impulses until the position ο is reached and consequently the office dialer will also be set to the seventh contact of the second group. From this it can be seen that the subscriber under no. 23, ie the subscriber is connected to the LW at the third contact of the second group, is connected to the exchange dialer AW at contact 7 of the second group. The subscribers who are connected to the line selector LW in the order 1 to 10 in the individual groups are connected to the exchange line dialer in the reverse order from 10 to 1. When relay PD is triggered, contact 78 pd is opened and thus the current

circuit for relay U interrupted. If the called subscriber is free, the following test circuit can be established: Earth, contacts 150 pd, 35 α, winding II and I of relay P ₃ , switching arm of the public exchange dialer AW in the position of the called subscriber (subscriber 23), line 79, winding jll of relay R, contact 5 1, winding II of relay T, battery, earth.

Relay Ρ _Ά switches through to contacts 36/73 and yj p _s . Relay Γ interrupts the subscriber's call circuit by opening contacts 1 1 and 2 t. After switching through, the subscriber is called in a known manner (not shown). If the called subscriber answers, the relay 5 responds, which energizes the ReMsF ₁ by opening the contact 40 s and closing the contact 41 s.

Relay V ₁ closes contact 42 V ₁ , so that the subscriber is blocked in a known manner by short-circuiting winding II of relay P _3. If relay 5 is energized when the called subscriber reports and thus ReIaIsV _{1 is} excited by closing contact 41s, the following circuit is established: earth, slow breaker LU, contacts 13Oy ₁ , 131 V ₁ , 126 kew, switching magnet EW, battery, earth. The switching magnet EW is now operated until the single selector EW has reached the rest position in which the contact 126 kew is opened. Likewise, when ReIaIsV ₁ responds when the subscriber reports, a circuit is closed via earth, slow breaker LW, contacts 132JZ ₁ , 133V ₁ , 129 & ew, switching magnet ZW, relay V, battery, earth, so that the switching magnet ZW is also operated for so long until the tens selector ZW has reached the rest position in which the contact 129 ^ zW is opened. Since the officer is connected to the line at the exchange dialer via the contacts 8 ο as and 81 as , she can perceive the ringing current and recognizes that the called party is free. It then puts the query key AT back into the rest position, also the key G and key 20 of the row of keys ZT and key 3 of the row of keys ET. The return of the aforementioned keys can also be brought about automatically by mechanical dependence on the return of the exchange key AT to the rest position. The calling exchange subscriber is now connected to the desired extension subscriber.

Manufacturing

an inquiry connection ¹
If there is a call over the trunk line AL , be it in the outgoing or incoming direction, and the extension subscriber N wishes to hold a query, he temporarily presses the Ta key. This energizes the differential relay X ₁ in the feed circuit of the extension. _{ReIaIsX 1} creates the following circuit for winding I of relay Y ₁ : earth, contacts 80Ar ₁ , 81z, winding I dea relay Y ₁ , battery, earth. The relay Y ₁ closes the contact 82 Jz ₁ and prepares a circuit for the relay Z. This circuit is established when ReIaIsX ₁ drops out after pressing the button and contact 80 X _{1 is} opened. The circuit then runs through earth, contacts 83 pd, 84V ₁ , winding II of relay Y ₁ , contact 82 J ₁ , winding I of relay Z, contact 8 rz, winding I of ReIaIsF ₁ , battery, earth. In the aforementioned circuit, relay Z also responds, opening contact 81 ζ and closing contact 85 z. The following circuit now exists for relay Y ₁ . and Z: earth, contacts 83 pd, 84 V ₁ , winding II of relay Y ₁ , contact 82 y _L , winding I of relay Z, contact 8 ζζ, winding II of relay Z, battery, earth. ReIaISy ₁ switches the exchange line to the consultation line 8 6, 87 by opening contacts 8 8 Jz ₁ and 89JZ ₁ and closing contacts 90 Jz ₁ and 9 Ij ₁ . By means of relay Y ₁ , a holding bridge is placed between the exchange line in a known manner (not shown). Furthermore, the following current circuit is closed by relay Y ₁ by closing contact 92 Jz ₁ : earth, contact 92 JZ ₁ , winding I of relay R ₂ , line 93, relay on, battery, earth. A test circuit for the call seeker AS at the contact 94 r _{2 is} prepared by relay ^. The relay An sets the call seeker AS to the calling line in the manner described, and in this case it is the inquiry line 86/87. If the switching arms of the call seeker AS reach the consultation line, the following circuit is established: Earth, battery, ReIaIsT ₁ , winding II of relay R ₂ , contacts 94 r2, 96 pd, 95Jz ₁ , switch armc of the call seeker AS in the position on the consultation line , Contact 11 b, winding II and I of the relay / ³ , earth. Relay / ³ stops the call seeker AS and causes the relays //, A, V ± and C to be energized.

The current impulse series used by subscriber N to set the line selector LW are transmitted through relay 5 in the supply circuit of call station N once to relay A by actuating contact 47 s and further to relay A by actuating contact 98 s to ten selector ZW and Transferring single voter EW .

The influencing of the relay A causes the setting of the line selector LW to the desired query participant in a known manner. The tens selector ZW and single selector EW are set in the following way: The first series of impulses acts on the tens selector ZW . The circuit for the tens selector ZW is as follows: earth, Eontakte 99 Jz ₁ , 98 s, 100 V ₃ , switching magnet ZW of the tens selector, relay V, battery, earth. During the series of impulses, the relay V is energized and thus the contact 78 ν is open. If the ten selector leaves the rest position, the contact 101 is closed. The tens selector ZW sets the switching mechanism to the contact corresponding to the series of current impulses. If the relay V drops after the end of the series of impulses, the following circuit is established for the relay Vg: earth, contacts 101 kzw, 78 p, relay V ₃ , battery, earth. The relay V ₃ opens the contact 100 V ₃ and closes the E contact 102 V ₃ . The next series of impulses sent by the subscriber thus acts on the single selector EW . The circuit is as follows: earth contacts 99Jz _1, 98 s, 102 V _8, solenoid EW EW of one selector, battery, earth.

After setting the line selector LW to the subscriber called in the inquiry, this subscriber is called in a known manner. If the subscriber answers, relay Y responds. Relay Y closes the following circuit at Eontakt 103 y : Earth, Eontakt 103 y, winding II of relay P ₁ , Eontact 27 x, switching arm d in the position on the inquiry line, Eontakt 97 ru, winding II of relay RU, battery, Earth. Contact 97 m is opened by relay RU , so that winding I in the aforementioned circuit is also switched on. _{ReIaIsP 1} switches off the feed bridges A 'and Y by opening the contacts 20 P ₁ , 2Ip ₁ , 1047 ^ and ^ιο 5Ρι · By dropping the relay Y , the contact 103 y is opened. _{The ReIaIsP 1} , once energized, is retained by the winding I in the test circuit. When relay A drops out, contact i $ a is closed. A short circuit of the winding I of the relay C and thus the triggering of the unit is prevented by opening the contact 16 ^ ₁ . By closing the contacts 106 ^ ₁ and lojp ^ the subscriber called in the inquiry now receives his feed circuit via the following path: earth, battery, winding I of relay Dr, winding I of relay U, Econtact 108 V ₂ , line 87, switching arm α of the call seeker AS in the position of the inquiry line, contacts 17 A, 107 P ₁ , switch arm α of the line selector LW via the subscriber called in the inquiry, switch arm & of the line selector LW, Eontakte 10Op ₁ , 18 h, switch arm & of the caller AS in the position of the inquiry line, line 86, Econtact 109V ₂ , winding II of relay U, winding II of relay Dr, earth. The test circuit of the call seeker AS is now maintained by the Eon clock 110 dr by relay Dr _{, regardless of the Eontakt 95J 1} . The relay U located in the aforementioned circuit is a differential relay and is therefore only actuated when the subscriber called in the inquiry presses an earthing button.

If the subscriber making the inquiry call wants to switch back to the exchange line after the inquiry has ended, the subscriber N again temporarily presses the key Ta and excites the Re-. _{The ReIaIsX 1} short-circuits winding II of ReIaIsF ₁ and winding I of relay Z at the contact. Relay Y ₁ drops out and opens contact 82 Jz ₁ . Furthermore, switching back from the inquiry line 86, 87 takes place by opening the contacts 90 Jz ₁ and 91 Jz ₁ and closing the contacts 88 Jz ₁ and 89Jz ₁ . If the subscriber N releases the key Γα and the relay X ₁ drops out, the circuit for the relay Z via earth, Eontakte 80 Jr ₁ , 852, winding II of the relay Z, battery, earth is canceled and the Eontakte this Relay returned to the rest position.

Switching a connection to the one called in the inquiry Attendees

If the called party in the back extension assume the office call, the number called in the back subscriber has to push his grounding key, which is excited in the supply circuit of lying in the inquiry being called differential relay U ER i °. 5 The relay U closes a hold circuit via earth, contacts 111 Jz ₁ , 112 ″, winding I of relay U, winding I of relay Dr, battery, earth, regardless of the keystroke. Contacts 35 ″ and 43.H and 34 ″ are opened by relay U , whereby the circuits via switching arm c and d of the exchange dialer are interrupted and a circuit for relay Tr is prepared by closing contact 113 u. The test 1 ¹ S relay P _{3 of} the exchange dialer AW drops out and opens the connection to the contacts 36 p _s and 37p ₃ . The relay 5 drops out and short-circuits the relay V ₁ at the contact 40 s, so that relay V ₁ also brings its contacts V ₁ to the rest position. By opening the contact 8 4 V ₁ , the holding circuit is

for the relay F ₁ and Z interrupted. The relay F _± remains energized after the relay P ₃ has dropped via earth, contacts π ¹ J pd, 113 Jz ₁ and 114/73, winding III of ReIaIsF ₁ , battery, earth. The rotary magnet D _{1 of} the exchange dialer is operated by relay U on the following cradle: earth, relay breaker RU ₁ , E contacts 70 pr, 71U, rotary magnet D ₁ , battery, earth. The rotary magnet D ₁ switches the switching arms of the exchange dialer until the group contact reached by the ten-digit dialer ZW ■ is reached on the switching arm e of the exchange dialer AW . In this case, a circuit for the relay Pr is connected to earth, contact 72 ", winding I of the relay Pr, switching arm of the decimal selector ZW on contact 2, switching arm of the exchange dialer AW in position 2, winding II of the relay Pr, battery, earth. The relay Pr holds itself once over * earth, contacts 75 pr, "j6kzw, which is closed with the first turn of the decimal selector, winding II of the relay Pr, battery, earth. Relay / ³ / · opens the contact 70 pr, so that the Circuit for the rotary magnet D _{1 is} interrupted. Relay Pr creates another circuit for the rotary magnet D ₁ ! Via earth, relay interrupter RU ₁ , contacts 73pd, 7AP ?, rotary magnet D ₁ , battery, earth.

Of the same relay interrupter ^ iZ ₁ of the switching magnet of one selector EW is at the same time pressed, via ■ following way: pd earth relay interrupter Ra _1, contacts 115, 116 pr, solenoid EW of one selector EW, battery, earth. The rotary magnet D ₁ and the switching magnet EW are therefore switched on in synchronism. This forwarding lasts until the single selector EW has reached contact ο. Since, as already described, the subscriber 23 called in the inquiry, who is probably connected to the line selector at contact 23, is reached at the exchange dialer via contact 27, the rotary magnet D ₁ must receive seven current surges. When the query four connection was established, the single dialer EW was set to contacts. When submitting the transfer criterion, the single selector must move from position 3 to position ο. This means that the switching magnet EW and the rotary magnet D ₁ must receive seven current surges until the circuit for the relay PD is connected to earth, contact 77 V ₁ , winding I of relay PD, switching magnet EW in position o, winding II of relay PD, battery "Earth comes about" and the circuit for the rotary magnet D ₁ and the switching magnet EW at contact 72, pd or 115 pd, separates. When relay PD responds , the circuit for relay F ₁ at contact 117 pd is opened, relay F ₁ drops out and switches back from the consultation line to the exchange line by opening contacts 90 Jz ₁ 'and 91 Jz ₁ and closing the Contacts 88 Jz ₁ and 89Jz ₁ . By opening contact 1 r 1 Jz ₁ , the holding circuit for relay U is interrupted, and a test circuit can now be connected to ground, contact 3 5 u, winding II and I of relay P ₃ , switching arm c in the position of the query called subscriber, that is in the present case contact 27, to the R and T relay of the subscriber called in the inquiry for battery, earth. The relay P ₃ causes the connection to the contacts 36/73 and -37 p ₃ and thus excitation of the relay 5 in the manner described. The relay 5 causes the connection of the exchange line by closing the contact 47 s; 41 s the ReIaIsV _{1 is} energized, which connects _{the exchange line to contacts 45V 1} and 46V ₁ . Relay V ₁ creates the following circuit: earth, slow breaker LU, contacts 130J ₁ , 13Iv ₁ , 126 hew, switching magnet EW, battery, earth. The switching magnet EW is now operated until the single selector EW has reached the rest position in which the contact 126 käw is opened. Likewise, when ReIaIsV ₁ responds when the participant reports, a circuit is closed via - earth, slow breaker LU, contacts 13 2 Jz ₁ , 133 V ₁ , izgkzw, switching magnet ZW, relay V, battery, earth, so that the switching magnet ZW is operated until the ten selector ZW has reached the rest position in which the contact 129 kzw is opened.

The switching processes described so far occur as soon as the transfer is initiated by a subscriber authorized for exchange connections and when the transfer incentive is given by a subscriber who is not authorized for exchange connections. In any case, the exchange connection is switched to the subscriber called in the inquiry. However, if it is a matter of transferring a connection to a subscriber who is not authorized for exchange connections, a circuit for a relay Tr is closed when the relay PD responds. It is namely applied directly to ground potential for all subscribers who are not authorized for exchange connections on the switching arm d of the exchange dialer AW, such as. B. shows the contact labeled 1 on the switch arm d of the public dialer. If the exchange dialer is redirected to a subscriber identified in this way, a circuit is connected via earth to the fixed contacts, switching arm d in the

Position of the subscriber who is not authorized for exchange connections, contacts 113 118 pd, winding II of relay Tr, battery, earth. The relay Tr closes the contact 119 tr and prepares itself a holding circuit. The holding circuit is established when contact 3 5 «is closed after relays Y and U have dropped out. The circuit then runs via earth, ίο contact 35 u, winding II of relay P ₃ , winding I of relay Tr, contact 119fr, switching arm c in the position of the subscriber called in the inquiry ium R and Γ relay of the named subscriber. The ReIaIsP ₃ in turn causes the connection to the contacts 3 6 p ₃ and 37 p% and thus the excitation of the relay 5 and V ₁ . At contact 44 p _s , after ReIaIsV _{1 has} responded and thus contact 42 V _x has closed, winding II of relay P _{3 is} short-circuited and the subscriber called in the inquiry is blocked. By opening the contacts 120 fr and 121 fr, the trunk line AL is disconnected and by closing the contact 122fr a holding bridge is placed between the trunk line via the throttle relay DR _1. The exchange connection is held by this throttle. Through the relay Tr , as indicated in the drawing, a lamp L can be switched on by closing the contact 123 fr, whereby the officer is made aware that a switchover of an exchange connection to an unauthorized subscriber has taken place. It then goes into the exchange connection and separates the connection in a known manner and establishes this connection to a new subscriber.
On the other hand, however, a signal can also be transmitted to the unauthorized subscriber by which he recognizes that a connection has been switched to which he is not entitled, and the subscriber can then, for his part, make an inquiry connection to an authorized subscriber Let participants switch. A connection is switched over by the subscriber called in the inquiry without first taking into account the traffic authorization, but on the other hand the possibility of speaking over the exchange line is prevented by disconnecting the speech wires if the subscriber called in the inquiry is not authorized to make an exchange connection. "is done.

Claims (4)

Patent claims: i. Circuit arrangement for telephone systems with different participants Traffic authorization and switching of an existing high-quality connection to another subscriber without Participation of a civil servant, characterized in that when it comes into effect a transfer incentive to transfer the existing high-quality connection regardless of the traffic authorization • of those called in the inquiry Intercom takes place and can be influenced by this switching means (relay 7>) which if the newly switched office is not authorized, only voice communication with the exchange station reached by taking over the connection, so that the unauthorized intercom or an officer can take over the high-quality connection can arrange for another intercom (authorized participant, civil servant). 2. Circuit arrangement according to claim i, characterized in that the switching means (relay Tr) disconnect the speech wires of the connection path when a high-quality connection is switched to a subscriber who is not authorized for this purpose. 3. Circuit arrangement according to claim 2, characterized in that the switching means (relay Tr) simultaneously prevent the triggering of the connection path of the high-quality connection. 4. Circuit arrangement according to claim i, characterized in that a character is transmitted through the switching means (relay Tr) to an officer or to the subscriber not authorized for high-quality connections, so that the officer or said subscriber can take over the high-quality connection by an authorized subscriber can cause. 1 sheet of drawings