DE655922C - Circuit arrangement for telephone systems with several exchanges and connection points of different traffic authorization - Google Patents

Description

The present invention relates to multi-switch telephone systems and connection points with different traffic authorizations.

Arrangements have now become known in which a production of connections may only be completed between incoming high-quality lines and desired connection points, if the desired connection point has traffic authorization for the incoming connection line is.

The invention consists in that when building a connection path over several Switching offices voters in an exchange located in front of the final switching office, via which connection points in this exchange are reached in the case of connections in the opposite direction of traffic check the traffic authorization of the desired connection point.

According to the invention, therefore, it is done by voters who are responsible for establishing the connection are used in a switching center located in front of the terminal switching center Check whether the connection point requested in each case is authorized to act in the terminal exchange is or not. In this test, the voters who work in the opposite direction as line voters when driving used as followers. To use followers, depending on to determine whether a desired connection is permissible or not not, is already known.

The arrangement according to the invention has, inter alia. the advantage that when used for others Purposes of existing voters and testing in an upstream switching center Criteria for the trunk authorization of the desired subscriber stations do not have the Connection line between the place in which the said voters are arranged and need to be transmitted to the local exchange. This is special advantageous in systems in which except between authorized and non-authorized Participants still differentiate between participants who are entitled to cross-connections between the individual Establish exchanges or not.

The voters are expediently used for identification of traffic authorizations arranged in that exchange of the network in which the high-quality connection lines end up.

In the drawing (Fig. 1 to 7) is a Embodiment of the invention shown

*) The patent seeker stated as the inventor:

Dipl.-Ing. Josef Förtsch in Berlin-Charlottenbiitg.

represents. The invention is not restricted to the exemplary embodiment. It's just that Circuit details required to understand the concept of the invention are shown been.

Fig. Ι shows the scheme of a processing structure for the traffic between exchanges, namely between the main center HZ and the secondary center NZ ίο and the traffic of these centers with the office.

2 and 3 show the arrangements of the main center HZ.

4 and 5 show the arrangements of the secondary center NZ.

Fig. 6 shows the arrangement for the Identification of the traffic authorization of the participants.

Fig. 7 shows the schematic of a circuit structure for traffic between two switching centers designed as main centers.

i. General system structure

In Fig. 1, two extension centers have been shown, one of which is referred to as the main center HZ and the other as the secondary center NZ . The trunk lines, of which line 1 is shown schematically, end in the main center HZ. Connections within the main office, e.g. B. between the participants JV ₁ and N ₂ , run over call seekers and line selectors, z. B. via the call finder AS and the line selector LW. Desires a subscriber of the main central HZ a connection to the office to manufacture, so it adjusts the line selector LW in a certain direction and thereby brings the relay to the response which, for the start-up of an office selector AS ₁ to a free trunk line. B. the exchange line i, stimulates so that this exchange dialer ■ adjusts to the connecting line of the calling party.

Connections' within the branch exchange NZ, z. B. Connections between the participants N _s and N ₄ , run via the connection devices AS ₂ and LW ₂ .

Via the cross-connection lines, e.g. B. QL, connections are established between participants in the main center HZ and participants in the Nebenzentraie NZ . A subscriber in the main center HZ, who wants to establish such a cross connection, sets the line selector LW to a certain connection and thereby brings the relay An ₁ to respond, which stimulates the Ouerverbindungswähler QW , so that this selector adjusts to the calling subscriber line. “Then the Ouerverbindungswähler Q W _{2 of} the secondary center NZ is set by the calling subscriber to a subscriber in the secondary center NZ . _ In a corresponding manner can be a participants' nj * r low center NZ after setting jpjSs line selector LW _t the Ouerverbinf'ifcngswähler QJ-P _2, so that this adjusts to the line of the calling subscriber the Nebenzentraie NZ, and these participants can then set the cross-connection selector QW of the main control center HZ to a connection line in the control center HZ .

If a subscriber in the secondary center NZ wishes to establish a connection with the exchange, he causes the cross-connection selector QW ₂ to adjust to his line by setting his line selector LW ₂ and then dials the exchange code, whereby the cross-connection dialer QW _{1 of} the main control center HZ is set to a terminal line to which the relay is to which ₁ of a free exchange line anläßt the official selector AS. If the exchange dialer AS _{1 is} set, the changeover point c is influenced so that the exchange connection is established while bypassing the facilities of the main control center HZ .

If there is an exchange connection for a subscriber in the secondary center NZ , this subscriber can consult with a subscriber in the secondary center NZ as well as with a subscriber in the main center HZ . In the first case it influences the inquiry switchover point s, while in the second case it influences the inquiry switchover point of the exchange line y . When external connections are established by subscribers in the "secondary center NZ , the identification of the authority authorization is carried out by the voter QW _{1 of} the main center HZ.

2. Establishing a connection between two participants of the

Main headquarters HZ

If the subscriber N lifts his receiver to establish a connection to the subscriber JV ₁ of his own system, the relay T is energized via earth, battery, relay T, resistor W ₁ , contact ii, subscriber loop N, contact 2 1, earth. The relay T is a step relay that only actuates contacts 3 1 and 4t in the first stage. By closing contact 3 1 , the calling subscriber is identified on switching arm c of caller AS , while closing contact 4 1 creates the following circuit for relay K : earth, contacts 5 1, 4t, relay ii, battery,

rde. The relay K responds and by closing the contact 6 k causes the beta

the rotary magnet D of the caller AS via earth, battery, rotary magnet D, contacts 7 α, 6 k, Sp ₁ , relay interrupter RU ₁ earth. The switch arms of the call seeker AS are now advanced until the following circuit is established: Earth, battery, relay T ₁ contacts 3 1, switch arm c of the call seeker AS in position 8, contacts gc, winding I des

ίο Relay A, earth. The relay A responds and interrupts the circuit of the rotary magnet D at the contact 7 α. Furthermore, by closing the contact 12 a, a circuit for the relay C via earth, contacts 11 w, 12 a, relay C ₁ battery, earth is established. The relay C responds and, by opening the contact 9c and closing the contact 13c, locks the calling subscriber in a known manner and energizes the relay T in the second stage. This opens the contacts 1 1 and 21 and thus interrupts the call circuit; on the other hand, the circuit of the relay K is interrupted by opening the contact 5 1. By opening contact 9 c , the circuit for relay A is interrupted; relay A is kept energized via earth, winding I of relay A ₁ contacts 1.4c, i6p _lr switch arm b of caller AS in position 8, via the subscriber loop of subscriber N ₁ switch arm α of caller AS in position b, contacts 17 P ₁ , 15 c, winding II of relay A ₁ battery earth.

In order to establish the connection to the subscriber N ₁ , it is necessary to set the line selector LW to contact 5. For this reason, five current impulses are sent out by the subscriber N and thus the rotary magnet D ₁ via: earth, battery, rotary magnet D ₁ , contacts 18 α, 19 c, earth is influenced by the relay A actuated by the interruptions at the subscriber station. After the line selector LW has been set to contact 5, the following test circuit is established via the holding arm c : Earth, contact 20Cj, windings II and I of relay P _1, winding I of relay P ₁ , switching arm c in position 5, line 45, line 46, Relay T ₁ , battery, earth. In this circuit, the relay P responds first, which by closing the contact 47 p brings about the blocking of the subscriber N ₁ reached via the line selector LW in a known manner.

Furthermore, the lines in the line selector LW are switched through at contacts 4 & p and 49 £. By closing the con-

- 50 p cycle, relay C is held regardless of the contact. The relay T ₁ in the test circuit is energized in the second stage, which interrupts _{the contacts 10Oi 1} and the call circuit for the subscriber A ^ _1. After switching through, the following ringing circuit comes about: from the 5-second switch 5 ", via which the ringing current is switched on for a short time in intervals of 5 seconds, winding II of relay U, contacts 51 H ₃ 4% p, switching arm a of the line selector LW in position 5, line 52 to subscriber station N ₁ , back via line 53, switching arm b of the line selector LW in position S, contacts 49p, i6p _lr 14c, winding I of relay A ₁ earth.

If the called subscriber N ₁ answers, the relay U located in the ringing circuit is excited in the pause in the call, which by opening contact 11 u and closing contact 33 ti creates a holding circuit via earth, contact 33 ti, winding I des Relay U ₁ contact 3 ic, switch arm e of the line selector on contact segment 1-10, rotary magnet D ₁ , battery, earth. In the latter circuit, the rotary magnet D _{1 is} not actuated. By opening contact 51 · «and closing contact 54μ, relay U switches off the ringing current and connects the line in the line selector. The speech connection with the desired subscriber N ₁ is thus established.

3a. Establishing an outgoing exchange connection from a subscriber in the main center HZ _Q g

For this purpose, z. B. the subscriber N from his listener, the relay T is energized via earth, battery, relay T ₁ resistor W ₁ , contact 1 1 via subscriber loop of subscriber N, contact 2 1, earth. The relay T is a step relay that only closes contacts 3 1 and 4i in the first stage. Through contact 3 ί the calling subscriber who is on the switching arm c of the caller AS. the contacts 8 is connected, while a circuit for the relay K via earth, contacts 5 t, 4t, relay K, battery, earth is established by contact 4 ί. The relay K responds and closes its contact 6 ~ k, creating the following circuit for the rotary magnet D of the caller AS : earth, battery, rotary magnet D, contacts γα, 6k, 8P ₁ , relay breaker RU ₁ earth. The rotary solenoid D receives current surges through the relay interrupter RU and switches the arms of the caller until the switch arms have reached position 8 and thus the following test circuit is established: Earth, battery, relay T, contact 3 t, switch arm c of the caller AS in position 8, contacts 9 c, 10 k,

Winding I of relay A, earth. In this circuit, relay A responds and, by opening contact 7 a, interrupts the circuit for rotary magnet D. Furthermore, relay C energizes relay C via earth, contacts hu, 12 a, relay C, battery, earth through relay A .

Relay C interrupts the test circuit across winding I of relay A by opening contact 9 c. However, a new test circuit is established via contact 13 c. By switching off the winding I of the relay A from the test circuit, an amplified current flows through the test arm c of the call seeker AS , and the relay T is energized in the second stage. This activates contacts 1 1 and 2 1 and thus interrupts the call circuit; on the other hand, the circuit for the relay K is interrupted _{by opening it of} the contact 5 1.

By closing contacts 14c and 15c, relay A is switched to earth, winding I of relay A, contacts 14c, 16 ^ ₁ , switch arm b of caller AS in position 8 via subscriber loop of subscriber N, switch arm α of caller AS in position 8 , Contacts 17 P ₁ , 15 c, winding II of the relay ^, battery, earth kept energized.

In order to establish an exchange connection on the part of the subscriber N , it is "necessary that the line selector LW is set to the contact 9. If the subscriber sends a certain series of current impulses for this purpose, e.g. nine current impulses, the rotary magnet D ₁ is activated accordingly The interruptions at the subscriber station are actuated by relay A , namely via earth, battery, rotary magnet D _{1 of} the line selector, contacts i% a, 19c, earth. After the end of the series of impulses, the following circuit is established via switching arm c of the line selector: Earth , contact 20c windings II and I of the relay P ₁ winding I of the relay P _1, switching arm c to the line selector LW in position 9, relay ₁ battery, earth. speak in this circuit, only the relay P and An. By relay once circuit-prepared for the call viewfinder AS _one of the official line on the contact 21 on the test, "while 22c" following circuit for the relay R us made by closing the contact d: earth, contacts 23 from, 22 on, 24 b, 25 C ₁ , winding I of relay R ₁ battery, earth. Relay R prepares the test circuit once at contact 26r via switching arm d of call seeker AS ₁ , while by closing contact 27 r the rotary magnet D ₂ of call seeker AS ₁ current surges via earth, relay interrupter RU ₂ , contacts 2Sc ₁ , 27T ₁ Rotary solenoid D ₂ , battery, earth receives. During the actuation of the rotary magnet D ₂ , the relay V is energized parallel to the rotary magnet D _2. The call seeker AS ₁ is now switched on until the following circuit is established: Earth, winding II of relay R _1, winding I of relay C ₁ , contacts 26c, switch arm d of caller AS ₁ in position 5, line 29, Schaltann d of the call seeker ^ S in position 8, winding II of the relay P ₁ , switching arm d of the line selector · LW in position 9, contact 2.1 α », resistor W ₂ , battery, earth. In this circuit, relay C ₁ responds first and interrupts the circuit for rotary magnet D ₂ at contact 28 C ₁ . Furthermore, the circuit of the relay R via the winding I is interrupted by opening the contact 25 C _1. By closing the contact 30C ₁ , a test circuit for the call seeker AS _{1 is} prepared via the switching arm c. In the circuit via the line 29, the relay P ₁ also responds, so that the following circuit for the relay U is established: Earth, battery, rotary magnet D _{1 of} the line selector LW ₁ switching arm e of the line selector, contact segment i-io, contact 31c, Winding I of relay U ₁ contact 3Zp ₁ , earth. The relay U remains independent of the relay P ₁ via its contact 33 u . The relay P ₁ opens its contacts 16 ^ ₁ and 17 P ₁ and thus the circuit for the relay A. The relay ^ opens its contact 12 α and thereby brings the relay C to waste, causing the house unit to be triggered.

3b. Establishment of an exchange connection for a subscriber in the main center HZ ₁ who can only be connected to the exchange line after an officer has called

Subscriber N ₁ can only get a connection with the exchange line if this subscriber contacts the officer via the facilities of the house control center and this officer establishes the connection to subscriber N ₁ after seizing an exchange line no. So if the subscriber N ₁ lifts his receiver for the purpose of establishing an exchange connection with the exchange line AL , the call seeker is set in the AVeise already described to the calling subscriber who is connected to the contacts 6 of the call seeker AS . The officer’s BA apparatus is connected via lines 57 and 58 to any contacts on the line selector LW , to which the calling subscriber 2V ₁ sends the line selector ZJF to.

has to ask. The setting of the line selector LW is also carried out in the manner already described. If the officer reports to the branch exchange, she can accept the request of the calling subscriber N ₁ , and the subscriber N ₁ has to hang up his receiver for the purpose of triggering the dialers AS and LW. The officer puts a switch on it,

ίο whose contacts are marked with R in order to. By closing the contact 59 R , a circuit for the rotary magnet D ₂ and for the relay V is prepared. Furthermore, a circuit for the Κει 5 lais H is prepared at the contact 60 R. By opening contact 108 R and closing contact 61 R , relay B can be energized via earth, contact 61 R, relay B, resistor W ₃ , battery, earth. The relay B opens the contact 24 b and closes the contact 44 b, so that the trunk line AL is blocked against occupancy and a further incentive to seize a trunk line arrives at a second unit. The officer operated a current impulse transmitter which, with its contact 62 ik, operated the rotary magnet D ₂ via earth, contacts 62 ik, 59 R, rotary magnet D ₂ , battery, earth. The rotary magnet D ₂ represents the selector AS ₁ through a certain impulse by the encoder number of pulses to the contact 2 of the call finder AS. ₁ During the transmission of the series of impulses, the relay V is excited parallel to the rotary magnet D ₂ , which opens its contact 63 ν. When the rotary magnet D ₂ receives the first current impulse, it closes the contact 64 d ₂ and thus creates the following circuit for a relay H : earth, battery, contacts 64 d _s , 60 R, relay H, earth. The relay H responds and closes its contact 65 / ^ so that the following holding circuit for the relay H is established: earth, battery, contacts 66 s, 65 h, relay H, earth. The relay H closes its contact 67 h and thus prepares a test circuit which is closed as soon as the relay V is brought to drop after the end of the series of current impulses and thus the contact 63 ν is closed. The following test circuit is established: Earth, contacts 63 ^ 67h, winding III and II of relay C ₁ , contact 36s or 86 r, switching arm c of selector AS ₁ in position 3, line 69, line 46, relay T ₁ , Battery, earth. In the aforementioned circuit, relay C ₁ responds and blocks the subscriber by short-circuiting winding III of relay C on contact 30 C ₁ . In addition, the line is switched through to contacts 38C ₁ and 39C ₁ . Ringer current is now sent to the subscriber in any arbitrary manner. If the called subscriber N ₁ answers, the officer will answer this via lines 70 and 71, contacts 72 R and 737? notified that he can take over the exchange connection. The officer then puts her switch R back to the rest position. When the subscriber reported, the relay 5 "was via earth, battery, winding I of relay S, winding I of relay X, contact 38C ₁ , Schaltann α of selector AS ₁ in position 3, line 74 to subscriber N ₁ , 'back over Line 75, switch arm b of selector AS ₁ in position 3, contact 39C ₁ , winding II of relay X ₃ winding II of relay S, earth energized. Relay 6 "interrupts the circuit of relay H at contact 66 s , so that this falls off. The connection between the subscriber JV ₁ and the exchange line AL is thus established.

If subscriber N _{1 were} to attempt to connect directly to the exchange line by setting the line selector LW to contact 9 and thus causing the relay An to be energized, then by closing contact 21a »when setting the line selector LW to the contact 9 immediately a circuit for the relay P ₁ via earth, resistor PF ₅ , Slialtarm d of the caller AS in position 6, winding II of the relay P ₁ , switching arm d of the line selector LW in position 9, contact 2IiW, resistor W ₂ , Battery, earth made. Relay P ₁ causes the line selector LW to be triggered in the manner described immediately after the subscriber N _{1 has} set it to contact 9 .

4. Establishing a connection between a subscriber in the main center HZ and a subscriber in the secondary center NZ.

If a subscriber in the main center HZ wishes to establish a cross connection, i.e. a connection with a subscriber in the secondary center NZ ₁ , a call seeker, e.g. the call seeker AS, runs again on the connecting line of the calling subscriber, as described for establishing a connection within the main center N and the subscriber can set the associated line selector LW by number current impulses. If he now wishes to establish a cross-connection, he dials the corresponding code number and brings the relay An ₁ to respond via the c-arm of the line selector LW. The relay An ₁ closes its contact 2000M ₁ and by short-circuiting the winding of the relay G causes the relay R _{z of} a free cross connection line in the following circuit to respond: earth, battery, relay R ₃ ,

Contacts 201 thg, 202 sp,
205 pr _a , 206 ab, 200 a%, earth. The relay R ₃ responds and closes the following circuit for the rotary magnet _{via its contact 2O7r 8} !) QW of the cross connection selector QW: Earth, battery, DQiF ", contacts 207? ·, 208C ₃ , 209 ^ 3, relay breaker RU _S , Battery, Earth, The rotary magnet DQW is switched on in this circuit in pulses, until the arms of the cross connection selector QW are set to the line of the called subscriber. Then the following circuit for the relays C ₃ and R _{3 of} the QW comes into being: Earth, winding III of relay C ₃ , winding II of relay R ₃ , contact 210 r ₈ , contact 21 ik _s , switching arm d of QW, line

212 (Fig. 3 and Fig. 2), α-arm of the AS, winding II of the relay P ₁ , d-arm of the LW, contact 2150%, resistance W _n , battery earth. If the calling subscriber is authorized to cross-connect, the contact has

213 Cn ₁ the resistor W _e switched off and ground removed, so that the relays come into effect in the circuit just described. The relay C ₃ responds in the described circuits, closes its contact 220 C ₃ and remains in the following circuit: earth, contacts 220C ₈ , 222U ₄ , winding II of relay C ₃ , contacts 223 cag, 224r ₃ , switching arm c des Cross connection selector QW, line 226 (c-wire, Fig. 3 and Fig. 2), 45 (Fig. 2), subscriber relay T or T _{1 of} the calling subscriber, battery, earth. By means of the contacts 227 C _{3 3} 238C and the relay C _3, the a- and & Vein by the selector QW. Then the relay / ₃ responds via its windings I and II via the a ~ and & -wires (lines 52 and 53, Fig. 3 and Fig. 2) of the loop of the calling subscriber, since the contact 23Oc _{3 is} closed. In the test circuit just described, relay P ₁ also responds via its winding II and triggers the house unit. When relay P _{1 responds} , contacts 16 ^ ₁ and 17 ^ _{1 are} opened, so that the circuit for relay A is interrupted. The relay A drops out and opens its contact 12 a. As a result, relay C drops out. By closing the contact 34 c, the home run circuit is closed for the rotary magnet D _{1 of} the LW , so that this selector runs into the rest position. The facilities of the house aggregate are thus brought back to the rest position. The response circuit of relay C ₃ has been disconnected.

When relay / ₃ responds, contact 23Ii _{3 is} closed. This places the battery on the fr wire of the cross-connection line QVL. Since the wires of the cross-connection line are crossed, there is voltage on the α wire in the secondary control center NZ , namely via earth, battery, relay SG, contact 23Ii ₃ , & wires in the main control center HZ ₁ α wire in the secondary control center NZ, Winding of relay A ₄ , contacts 300 ^ ₄ or 301 X ₅ , 302 i ₅ , 303 X ₇ , earth. In the circuit just described, the relay S _s in the main center HZ and the relay A ₁ in the secondary center NZ . The response of the relay S ₄ in the main control center does not affect the establishment of outgoing cross-connections. In the secondary center NZ (Fig. 4) the following circuit for the relay E _{4 is closed by closing the contact 3ioa 4} : Earth, battery, rotary magnet DQW ₂ , switching arm e of the QW ₂ , winding I of the delay relay E ₄ , contacts 310 a ₄ , 31Ic ₅ , earth. The relay B ₄ prepares a circuit for the rotary magnet DQW ₂ , which did not respond in the circuit described above, via its contact 312 e _4. Now the calling subscriber begins to send out the number of power surges corresponding to the called subscriber of the secondary center NZ. Depending on the impulse relay A ₄ , the contact 3130-4 is closed in a current impulse, so that the rotary magnet DQW ₂ moves the switching arms af of the selector QW ₂ step by step until they have reached the connection line of the desired participant. If the participant is free, the following test circuit is established: Earth, contact 34Oc ₄ (the relay E ₄ is still activated due to the drop-out delay), contact 341 V ₂ , windings I and II of relay C ₅ , contact 3423/4, switching armc of the QW ₂ , line 343 (Fig. 4), line 46 (Fig. 5), subscriber relay T _{4 of} the called subscriber, battery, earth. In this circuit, the relay C ₅ responds and blocks in a known manner by closing its contact 3SOC ₅ and short-circuiting its winding I via contact 351J ₅ to earth. The called subscriber receives ringing current via the 5-second switch 5 ″, line 330, winding of the relay K ₅ (opposite winding). The relay K ₅ has come to response via its winding I in the following circuits: earth, battery, relay K _5, winding I, contacts 335 c _s, 336C _4, earth. logs the called subscriber, the relay K is dropped ₅ over its counter-wound II. the relay K ₅ bridged by its contacts 355 ^ 5 ^an d 356 £ _5, the Capacitors in the connecting line QJi ^ _2. Since the relay C _{5 has switched the line} through through its contacts 357 c _s and 358 c ₅ , the relay J ₄ speaks via its windings I.

and II and the participant loop. By opening contact 360J ₄ and closing contact 361 ^ ₄ , the following circuit for relay S _{t is} closed: earth, battery, "resistor W ₁₀ , contact 362 ^ r ₄ , winding I of relay S ₁ , contact 36Ii ₄ , 5 -Wire of the connection line in NZ, α-wire of the connection line in HZ (Fig. 3), winding of relay A ₃ , contact 250Zi ₄ , button AT ₁ earth.

In this circuit, the relay S ± in the control center NZ and the relay A _s in the control center HZ respond . By closing the contact 365 s _t , a circuit for the relay> S _{S is} closed. The reverse triggering is prepared by the contacts of the relays JiT ₄ and S _5. The response of relay A ₃ in the main HZ has the following effect: Since contact 25Ii _{3 is} closed, a circuit for relay U _{3 is} closed by closing contact 252G ₃ : earth, battery, relay U _s , contacts 252 a _s , 25Ii ₃ ) earth. U ₃ causes the relay (T ₄ to respond) by closing the 253% contact.

After the conversation over the cross-connection line is over, the release takes place both depending on the calling party and depending on the called subscriber.

If the calling subscriber hangs up his receiver, relay J ₃ drops out. This also causes relay U ₃ and thus relay C7 ₄ to drop out.

Since the relay U ₄ falls delayed, the contact 222 W _{4 is} open and thus the c-wire is separated, so that the relay C ₃ falls. When relays / ₃ and U ₃ drop, the voltage that was via relay S ₃ on the 5-wire in the control center HZ or on the α-wire in the control center NZ is removed, so that here too the relay A ^ comes to fall. By opening the contact 20OM ₃ and delayed closing of the contact 2502 (4 earth is removed from the a- or & Vein, so that the relay vS _"4 comes in the off center to NZ. Fall off. Since the contact 370J ₄ yet opened is before contact 351 s $ closes, the c-wire is disconnected, so that relay C ₅ drops out. As a result, the subscriber relays drop out, so that the connection devices are again in the idle position. Hangs after the call has ended If the called subscriber, i.e. the subscriber in the secondary center NZ ₃ , is noticed, the relay T ₄ (FIG. 4) drops. When the contact _{361 i 4} is opened, the relay S _A and thus the relay ^ _{5 drop} . 375 ^s open i and the contact is 302j ₅ not yet closed, da.s relay A is _one to fall for the rotary magnet DQW _2, the following reset circuit is closed: earth relay breaker RU _it winding I of the relay PR _it contacts 275 r _s, 376 ^ ₄ , e-arm. Of voter QW ₂ , DQW ₂ , battery, earth. The rotary magnet receives current surges in this circuit, so that the cross-connection selector QW _{2 is brought} into the rest position.

In the main control center HZ , relays A ₃ and S ₃ drop out. The connecting devices have thus returned to the rest position.

5. Incoming exchange connection for a subscriber in the main switchboard.

If an exchange connection arrives via the connecting line AL for a subscriber in the main center HZ , the AC relay AR is made to respond in a known manner by the alternating ringing current. This relay causes the call lamp, not shown, to light up in a known manner; this indicates to the officer that there is a call. The officer then presses her button and thereby places her interrogation set BA to the trunk line AL. The calling participant informs the officer which participant of the private branch exchange he wants to be connected to. The officer then presses her switch R and dials the connection number of the desired subscriber. Depending on the dial, the contact 621k is actuated so that the rotary magnet D _{2 of} the exchange dialer AS _{1 is} energized in bursts in the following circuits: earth, battery, rotary magnet D ₂ , switch 59 R, contact 62 ik, earth. ' The relay V _1, which is designed as a delay relay, is maintained during the series of current impulses. The selector AS ₁ , designed as a rotary selector, is now incremented until it reaches the connection line of the desired subscriber. When the rotary magnet D ₂ responds, the contact 64 ^ _{2 has also been} closed, so that the relay H responds in the following circuits: earth, battery, contact 64 d ₂ , switch 60 R, relay H ₃ earth. The relay H holds itself through its contact 65/1 and the contact 66. Since the relay V falls after the series of impulses has been sent out, the relay C ₁ speaks when z. B. the participant N is required, in the following circuits: earth, battery, winding of relay T ₃ line 37, switching arm c des. AS ₁ in position 5, contact 68 r, windings II and III of relay C ₁ , contacts 67 h, 63 V ₁ earth. The relay C ₁ shorts its contact 30 C ₁ and thus its winding III, so that the called subscriber line in a known manner

is blocked. Since relay C ₁ closes its contacts 38 C ₁ and 39C _1, the official

: line AL has switched through, the subscriber Λ 'is now connected to the exchange line, so that the officer’s switching activity is ended and the conversation can be conducted.

6. Establishment of an inquiry connection by a subscriber connected to the exchange line Main headquarters in this headquarters

Desires z. B. the subscriber N connected to the exchange line to hold a query to the subscriber N ₃ , the subscriber N temporarily presses his button Ta ₃ whereby the differential relay X in the feed circuit is temporarily excited. Relay X energizes relay Z via earth, contacts 190 b, 76C ₁ , 77y, winding I of relay Z, contact 78 x, resistor W _e , battery, earth, which independently of relay X at contact 79 3 has a holding circuit for itself and an excitation circuit for relay Y. This circuit runs via earth, contacts 190 b, 76 c _u 77 y, winding I of relay Z, winding 1 of relay Y, winding II of relay Z ₃ contact 79s, resistor W ₀ , battery, earth. In this circuit, relay Y also responds, opens contact 77 y and closes contact 80 y. The circuit for relays Y and Z now runs over earth, contacts 190 b, 76C ₁ , 80 y, winding II of relay Y, winding I of relay Y, winding II of relay Z, contacts 79 s, resistor W ₀ , Battery, earth. Relay Y opens contacts 81 y and 823; and closing contacts 833; and 843 * made a switch from the trunk to an inquiry line 85-86. The exchange connection is held by opening contact 873 »and closing contact 883» via a relay Dr ₁ . The relay Dr ₁ responds this and switches by closing the contacts 89 (Ir ₁ and 90 Ur _1, a differential relay in U ₁ to the inquiry line 8 5-86 in. Further, by relay Y, a circuit for the relay T ₂ of the consultation terminal, which to the contacts 10 of the call finder is connected aS of the home office, prepared, via earth contacts 9Ic _1, 923 ;, 93 ^ ReIaIsT _2, battery, earth. the relay T ₂ is formed as a stepped relay as a subscriber relay, z. B . T or T _1. Relay T ₂ responds in the first stage and closes its contacts 94 t ₂ and 9Si ₂ - Contact 94 t _{z identifies} the inquiry line, while contact 95i ₂ relays K via earth, contacts 9Of ₂ , 95 i ₂ , relay K ₁ battery, earth is energized.

The relay K effects the setting of the call seeker AS in the manner already described. The call seeker runs until the position 10 is reached and thus the relay T _{2 is} energized in the second stage after the consultation connection has been blocked by opening the contact gc and closing the contact 13c. The relay T ₂ opens the contact 93 1 ₂ and the contact 9Oi ₂ . The excitation circuit for the circuit of the relay T _{2 is} interrupted by contact 93 U , while the relay K is interrupted by contact 9Oi _2. At the contact HOi _{2 the} exchange connection is independent of the contact 883; maintain.

After the contacts 843 / and 833 / have been closed, a jumper is placed via contact 97 ί for the current impulse transmission via the inquiry line 85-86. After the call finder AS has been set, the subscriber N sends a certain series of current impulses to the inquiry line 85-86 for the purpose of setting the line selector LW. The interruptions at the subscriber station act on the relay S , which in turn, after setting the caller, the earth, battery, winding II of the relay A ₃ contacts 15c, IJ'P ₁ , switching arm α of the caller AS in position 10, line 85 , Contact 843;, throttle Dr ₃ contacts 97 ^ 83 y, line 86, switching arm & of the caller AS in position 10, contacts 16J ₁ , 14 c, winding I of relay A, earth interrupts existing loop at contact 97 j accordingly and thus the rotary magnet D ₁ is actuated by the relay ^ in accordance with the series of current impulses sent. The line selector LW is set in the manner already described to the contacts 3 of the line selector LW ₃ to which the subscriber TV _{3 is} connected. After subscriber N _{3 has reported} , the ringing current is switched off and through-circuiting is effected in the manner already described, so that a voice connection now exists between subscribers N and N ₃ and at the same time the previous connection with the exchange line is maintained.

7. Transfer of the exchange connection to the subscriber in the main switchboard with whom the inquiry call is held

■ The via the connected to the contacts 3 participants _N3 is entitled to directly produce both an office compound and a trunk call to switch to it. If the latter is to take place, the subscriber N ₃ presses an earthing button on the call station and thereby causes the differential relay U ₁ to be energized, which is connected to the line 85-86 parallel to the feed bridge relay A.

is switched on in the line selector. The relay U ₁ responds, opens its contact 89 Ji ₁ and closes its contact 99 U ₁ , so that the winding II of the relay U _{1 is} switched off and a winding III of the relay R is connected to the line 86 via contact 99 U ₁ . If the subscriber , N ₃ releases the button, there is earth, battery, contact 89 dr _x or contact 109M ₁ , winding I of relay U ₁ , line 85, switching arm σ of caller AS in position 10, contacts 54 u, 4 & p, switch arm α of the line selector LW in position 3 to subscriber JV ₃ , back via switch arm b of the line selector LW in position 3, contact 49 £, switch arm b of the caller AS in position 10, line 86, contact 99%, winding III of the relay R, earth a circuit for relays U ₁ and R. Relay U ₁ also energizes relay AB by closing contact 10OM ₁ via earth, contact 100M ₁ , relay AB, battery, earth. Relay AB opens contact 23 . Since relay Z was energized when the inquiry connection was established and ₍ mmmore relay R by closing contact 99M _1, the test circuit of the external call seeker AS ₁ , which was previously via contact 68 r and which ran via switching arm c to position 5 of the calling extension subscriber JV, interrupted and thus ₁ brought the relay C to drop. relay C ₁ interrupts at the contacts 38 _C1 and 39C ₁ the circuit for the relay S, so that 42 sec and closing of the contact is short-circuited Lois the relay B also by opening the contact , drops out and the blocking, which took place by opening contact 24 ft and closing contact 44 &, is canceled. However, since relay AB has been energized by relay U ₁ , the exchange line AL cannot be occupied by another calling subscriber, since a Anr.eiz to the call finder aS ₁ set by the open contact 23 is prevented from. by the fall of the relay C _1, the contact 76 C ₁ opened, so that the circuit for the relays Y and Z is interrupted. These relays drop out and bring the contacts to rest. Contacts 83 y and 843; opened and the contacts 81 y and 823) closed, so that the switchover from the consultation line 85-86 to the exchange line is brought about. The holding bridge of the exchange line via contact 883; is separated. By energizing the relay R , after the relay C _{1 has} dropped out, a circuit for the rotary magnet D ₂ of the caller AS _{1 is established} via earth, battery, rotary magnet D ₂ , contacts 27 r, 2Sc ₁ , relay breaker RU ₂ , earth. The call seeker AS ₁ is now advanced until the following circuit is established: Earth, winding-II of relay R, winding I of relay C ₁ , contact 26 r, switch arm d of call seeker AS ₁ in position 2, line 102, switch arm d of the line selector LW in position 3, winding II of the relay P ₁ , switching arm d of the caller AS in position 10, contact 103M ₁ , resistor W ₇ , battery, earth. Relay C ₁ responds first in this circuit. By relay C ₁ of the circuit of the rotary magnet D ₂ at the contact 28 C ₁ is interrupted. Furthermore, the renewed switching takes place at the contacts 38C ₁ and 39C ₁ and thus energizing the relay S. The relay 6 * closes its contact 42 j, so that relay B is again energized and creates a holding circuit for itself at contact 43 b.

In the test circuit of the call seeker AS ₁ via switching arm d , the relay P ₁ is also energized, which in the manner already described triggers the call seeker AS and the line selector LW . If switch arm c leaves position 3 when triggered, the test circuit of line selector LW via earth, contacts 20 c, 4.7 p, winding I of relay P _1, winding I of relay P ₁ , switch arm c of line selector LW is in position 3 to the subscriber relay of the TeilnetameriV3 and battery, earth interrupted, so that now a test circuit for the call seeker AS _{1 of} the exchange line via earth, contact 3Oc ₁ , winding II of the relay C ₁ , contact 363 or 68 r, switching arm c of the caller AS ₁ in Position 2, line 104 to subscriber relay, not shown, of subscriber JV ₃ and battery, earth is closed.

Subscriber Λ ^Γ ₃ is now connected to the outside line and can continue the outside call.

However, if the subscriber N has established an inquiry connection to a subscriber who can only receive a connection to the exchange line if an officer has established the connection to the subscriber, e.g. B. JV ₁ , and this participant tries to switch the office connection on himself, this is prevented in the following way: The establishment of the inquiry connection by the participant N to the participant JV ₁ takes place in the already only with the difference that the line selector LW is now set to the contacts 5. _{If the subscriber JV 1} presses his button Ta _{1 to} transfer the exchange connection after the inquiry connection has been established, the differential relay U _{1 is} activated in the manner described, which is connected to the contact 10 of the battery at the contact _{1OjM 1}

Call seeker AS creates. Since the line selector LW is in position 5, in which earth is switched on via the line 105, resistor W ₅ , a circuit via earth, battery, resistor W ₇ , contact 103%, switching arm d of the caller AS is in position OK, winding II of the relay P ₁ , switching arm d of the line selector LW in position 5, line 105, resistor W ₅ , earth. It immediately responds to the relay P ₁ and causes the call finder AS and the line selector LW to be triggered in the manner described. Therefore, before the subscriber JV ₁ releases his button and thus the relay R can address, which causes the switching of the selector AS ₁ of the exchange line, the switching arms of the line selector LW are switched on and thus the circuit for the relay U _{1 is} interrupted. Subscriber N remains connected to the exchange line and can only switch back from the consultation line 85-86 to the exchange line AL or call another subscriber via the consultation line 85-86 who is authorized to take over the exchange connection. This subscriber can then take over the exchange connection in the manner already described.

The switch back from the consultation line 85-86 to the exchange line AL by the subscriber N takes place by temporarily pressing the button of the subscriber N. This energizes the relay X in the manner already described, which at the contact 7.8 χ the winding I of the relay Y and the winding II of relay Z short-circuits. Relay Y remains energized via earth, contacts 190 b, 76C ₁ , 80 y, winding II of relay Y, contact 78 x, resistor W _e , battery, earth, while relay Z is brought to drop out. Relay Z opens contact 79 z. If the participant releases the button, the relay X is also de-energized, whereby the current circuit over the winding II of the relay Y is interrupted by opening the contact 78 χ. Relay Y drops out and switches back to the exchange line by opening contacts 83 y and 84 y and closing contacts 81 y and 82 y. The holding bridge over the throttle Dr ₁ is switched off by opening the contact 88 y and closing the contact 87 'y , and the subscriber N is now again connected to the subscriber via the exchange line.

If there was a query connection to a subscriber who is not authorized at all for trunk connections, the release occurs when attempting a transfer in exactly the same way as previously described for subscriber N ₁ , since a subscriber who is not authorized for trunk connections on switching arm d of the call seeker AS and on the switching arm d of the line selector LW is provided with the same potentials as the subscriber N ₁ , ie via the switching arm d , in the position of the unauthorized subscriber, both the caller AS and the line selector LW are connected to earth via a corresponding resistor W _5. The relay P ₁ in the line selector then checks in each case whether the subscriber called in the inquiry has authorization to take over the exchange connection, in that this relay P ₁ prevents the transfer in the case of unauthorized subscribers, while when transferring an exchange connection through an exchange connection Authorized subscriber the relay P ₁ comes into effect only after the call seeker AS _{1 has been set} to the subscriber who transfers the connection in the test circuit and only then causes the call seeker AS and the line selector LW to be triggered.

In the embodiment shown in the drawing, the participants who are not authorized to establish an exchange connection and to which an exchange of an exchange connection cannot take place, on the dialer AS _{1 of} the exchange line, or the participants who only after a call from an officer with a External line can be connected, not connected to switching arm d of selector AS _1. The subject matter of the invention can also be used when all subscribers, including those to whom an exchange connection cannot be transferred, are connected to the dialer AS _{1 of} the exchange line. The transfer of an office connection to an unauthorized subscriber is, as can be seen from the description, prevented by the fact that the continuation of the dialer AS _{1 of} the exchange line to the subscriber to whom the transfer is to be prevented does not take place, so that the subscribers to whom a transfer is to be prevented can also be connected to the dialer AS _{1 of} the exchange line. This enables you to make a change in relation to the authorization of the participants without a significant change in the system. It is only necessary here to apply the subscriber connection on the switching arm d, to which a transfer could previously take place, via a corresponding resistor W ₅ to earth. In the opposite case, this earth is to be removed _{via 120 · ■ the resistor W 5} on the switching arm d.

8. Flickering to the officer by a participant in the main HZ

Desires z. B. the subscriber N of the main

S central .HZ, if he is in connection with the office via the line AL , to flicker to the officer, the participant presses his button Ta for a long time, whereby the winding II of the relay X short-circuited

ίο is and for the winding I of this relay there is the following circuit: earth, battery, winding I of relay S, winding I of relay X, contact 38 C ₁ , switching arm α of the exchange dialer AS ₁ in position S, line 40, button Ta on of subscriber station N, earth. The relay X responds and closes a circuit for the thermal relay Th, which has the following course: earth, battery, winding of the thermal relay Th, contacts. 120 λ-, i2i b, 122 C ₁ , earth. The relay Th responds after a while and closes the contact 123 th. As a result, the relay B ₁ , which is above ground. Battery, resistor W _5n , winding of relay B ₁ , contact 124 ^ ₁ , earth was energized, shorted to earth, contacts 122C ₁ , 123 th, 126 λ-. The relay B ₁ drops out, opens the circuit for the lamp U ₁ through its contact 128 b ₁ and switches the lamp into the following circuit by closing the contact 12Jb ₁ : earth, battery, lamp U ₁ , contacts 127O ₁ , 129 ^ ₁ , Relay interrupter RU ₅ , earth. The lamp U ₁ is brought to the Flakkern by the relay interrupter RU ₅ , as long as the button Ta is pressed by the subscriber N.

9. Establishing a connection between participants N ₃ and A ^r ₄

the extension switchboard NZ 40

If the subscriber IV ₃ lifts his receiver for the purpose of establishing a connection to the subscriber N ₄ of his own control center NZ, the relay T _{3 is} connected to earth, battery, relay T ₃ , resistor W ₆ , contact 400 * ₃ , subscriber loop e N ₃ , Contact 401 i ₃ , earth energized. The relay T ₈ is a step relay which only operates the contacts 402 1 ₃ and 403 i ₃ in the first stage. By closing the contact 402 1 ₃ , the calling subscriber is identified on the switching arm c of the call seeker AS ₂ , while closing the contact 403 * ₃ creates the following circuit for the relay K ₄ : earth, contacts 404 * 3, 403 * 3, relay K ₄ , battery, earth. The relay K ₄ responds and, by closing the contact 405 k _4, actuates the rotary magnet D _{4 of} the call seeker AS ₂ via earth, battery, rotary magnet D ₄ , contacts 406 a ₄ , 405 k ₄ , 407 P ₁ , relay interrupter RU ₄ , Earth. The switching arms α to d of the caller AS ₂ are now advanced until the following circuit is established: Earth, battery, relay T ₃ , contact 402 * 3, switching arm c of AS ₂ in position 8, contact 408 C ₄ , 409 & ₄ , winding I of relay A ₄ , earth. A relay ₄ is activated and interrupts the contact 406 a _{4 shows} the circuit of the rotary magnet D. ₄ Furthermore, by closing the contact 41Oa _4, a circuit for the relay C ₄ via earth, contacts 411M ₄ , 41Oa ₄ , delay relay C ₄ , battery, earth is established. The relay C ₄ responds and causes by opening the contact 408 c ₄ and closing the contact 415 c _4, the blocking of the calling subscriber in a known manner and also the excitation of the relay T ₃ in the second stage. This opens the contacts 400 i ₃ and 401 * 3 and thus interrupts the call circuit. On the other hand, the circuit for relay K _{4 is} interrupted by opening contact 404 * 3. By opening contact 408C ₄ , the circuit for winding I of relay A _{4 is} interrupted, but relay A ₄ is still kept energized via earth, winding I of relay A ₄ , contacts 416 C ₄ , 417 px, switching arm & des Call seeker AS ₂ in position 8 via subscriber loop of subscriber N ₃ , switching arm a of call seeker AS ₂ in position 8, contacts 418 ^ ₁ , 419 C ₄ , winding II of relay A ₄ , battery, earth.

In order to establish the connection to the subscriber N ₄ , it is necessary that the line selector LW _{2 is set} to the connection 5. For this reason, the subscriber IV ₃ sends out five current impulses and thus through the relay A ₄ transmitting the interruptions at the subscriber station, the rotary magnet D _{5 of} the line selector LW ₂ via earth, battery, rotary magnet D ₅ , contacts 420 a ₄ , 421 c ₄ , Earth affects. After the line selector LW _{2 has been set} to contact 5, the following test circuit is established via switch arm c : Earth, contact 425 c ₄ , windings II and I of relay P ₄ , winding I of relay P ₅ , switch arm c of LW ₂ in position 5, line 45, line 46, relay T ₄ , battery, ground. In this circuit, the relay P ₄ responds first, which by closing the contact 406 p ₄ causes the blocking of the subscriber N ₄ reached via the line selector LW ₂ in a known manner. Furthermore, the lines in the line selector LW _{2 are switched} through at contacts 428 /> ₄ and 429 p _4. By closing contact 430 p ₄ , relay C _{4 is held} independently of contact 41Hi ₄ . The relay T ₄ in the test circuit is energized in the second stage, which causes the contacts 431 * ₄ and 432 * 4

the call circuit for the subscriber Λ ~ _{4 is} interrupted. After successful connection, the following ringing circuit is established: From the 5-second switch 5 ", via which the ringing current is switched on for a short time in 5-second intervals, winding II of relay U ₄ , contacts 435 U ₄ , 4 ² 9Pi! Switching arm α of line selector LW ₂ in position 5, line 52 to subscriber station IV ₄ , back via line 53, switching arm b of the line selector LW in position 5, contacts 428 ^ ₄ , 417 ^ ₁ , 416 c ₄ , winding I of relay A ₄ , earth.

If the subscriber N ₄ answers, the relay U ₄ in the ringing circuit is energized in the pause in the call, which by opening contact 411 U ₄ and closing contact 448 Ji ₄ creates a holding circuit via earth, contact 448 U ₄ , winding II of the relay U ₄ , contact 441 c ₄ , switching arm e of the line selector, rotary magnet D ₅ , battery, earth produces. In the latter circuit, the rotary magnet D _{5 is} not actuated. By opening contact 435K ₄ and closing the contact, relay U ₄ cuts off the ringing current by 450% and connects the line in the line selector. The speech connection with the desired subscriber N ₄ is thus established.

10. Establishing a cross connection from a subscriber in the secondary center NZ to a subscriber in the “main center HZ

If a subscriber of the secondary center NZ wishes to establish a cross connection, he takes the receiver off the hook. In a known manner, the call seeker AS ₂ runs on his connection line, and the subscriber can set the line selector LW ₂ by dialing the code number for the cross connection. If the LW _{2 is} set, the relay An _{5 is activated} in the following circuits: earth, battery, relay An ₅ , contact 450 £ (this contact of the common cut-off relay G is always closed), contact 451 g _t (the cut-off relay G ₁ is only addressed if there is no longer any transmission option), switch arm c des

LW ₂ , winding I of relay P ₅ , windings I and II of relay P ₄ , contact 425 C ₄ , earth. The relay An ₅ closes its contact 376 to ₅ and thus the following circuit for the relay R ₅ : Earth, battery, winding III of the relay R ₅ , contact 377 thg, 37.8 sp, 379 V ₄ , 380 pr ₄ , 376 to ₅ , Winding II of relay C-, contact 381 from, earth. The relay R ₅ closes its contact 3827-5 and thus the following circuit for the rotary magnet DQW _{2 of} the selector QW ₂ : earth, battery, rotary magnet DAW ₂ , contacts 383 C ₅ , 382T ₅ , relay interrupter RU ₄ , earth. The selector QfF ₂ is switched on in this circuit by the relay interrupter until it has reached the line of the calling subscriber. In this case, the following test circuit is established: earth, battery, resistor W ₂ (Fig. 5), contact at ₅ , d-Axm of LW ₂ , winding-'lungll of relay P ₅ , d-arm of AS ₂ , line 75 5 (Fig. 5, Fig. 4), d-ΑΐΐΏ. des QiF ₂ , contact 755 r ₅ , winding II of relay R ₅ , winding III of relay C ₅ , earth. The relay P ₅ responds and brings the relay A ₄ to drop by opening its contacts 447 ^ ₅ and 447 p _5. The relay A ₄ opens its contact 41Oa ₄ and thus the circuit of the relay C ₄ . The dropped relay C ₄ triggers the house unit. After the line has been switched through through contacts 357C ₅ and 35Sc ₅ , relay J ₄ responds again, as previously described. I ₄ causes the relays S ₄ and A ₄ in the secondary control room and the relays Ji ₃ and A ₃ in the main control center to respond again. The QW cross-connection selector in the main control center can now be set by the calling subscriber in the secondary control center by means of power surges. The relay / ₄ transmits the current impulses by means of the contact 30Oi ₄ to the relay A _{3 of} the main center. When relay A ₃ responds, the following circuit for winding I of relay E _{3 has been} closed by closing contact 280 a ₃ : earth, battery, rotary magnet DQW, switching arm e of selector QW, winding I of relay E ₃ , contacts 280 a _s and 281 caf, earth. The relay E _s responds in this circuit and, via its contact 282 g _a , prepares a circuit for the rotary magnet DQW, which does not respond in the circuits described above. The subscriber now sends out the series of current impulses for setting the cross-connection selector QW, which is designed as a rotary selector. The relay A% transmits the current impulses via its contact a ₃ in the following circuit to the rotary solenoid: earth, battery, DQW, contacts 284COg ₁ 28303, 282C ₃ , earth. If the cross-connection selector has reached the line of the subscriber in the main center, the following test circuit is established: Earth, contacts 285 e ₃ , 286 ^ ₄ , windings I and II of relay C ₃ , contacts 223 cag, 224 r ₃ , c-arm des QW, subscriber relay of the called subscriber. The relay C ₃ responds, as already described, in this circuit, causes _{the blocking via its contact 220 c 3} and switches the line through through its contacts 227 C ₃ and 23Sc ₃ . The subscriber receives ringing current via the 5-second switch 5 ", winding II of relay K ₃ , con-

bars290 k ₃ , 227C ₃ , α-arm of the QW, loop to the participant, 5-arm of the QW, contacts 238 C ₃ , 682 k ₃ , earth. The relay K ₃ had already responded in the following circuits via its winding I: Earth, battery, winding I of relay Ä ' ₃ , contacts 287 e ₃ , 288 c ₃ , earth. The relay A ₃ then stayed in .them circuits via its contact 289 ^ _3. If, however, the called subscriber answers, the relay K ₃ is thrown off via its winding II, which is designed as a counter-winding. The line is switched through at contacts 661 k ₃ and b & 2k ₃ . When the called subscriber reports, relay J ₃ responds. The called subscriber is fed via the windings I and II of the relays X ₃ and / _3. A connection has thus been established between a subscriber in the secondary center NZ and a subscriber in the main center HZ . The connection devices are triggered in a known manner.

11. Making an outgoing
Exchange connection for a subscriber in the secondary center NZ

If a subscriber in the secondary center NZ wishes to establish an outgoing trunk connection, he / she sets the cross-connection selector QW of the main center in accordance with the establishment of an outgoing cross-connection, namely by dialing the outside line code. The relay An (Fig. 2) then responds in the following circuit: Earth, battery, relay An, line 261 (Fig. 2 and Fig. 3), c-arm of the QW. The further course of this circuit has already been described; it is connected to earth via contact 285 e _3. In this circuit, relays C ₃ and An respond in the main control center. By responding to the relay An is, as already described in the production of an outgoing exchange connection by a subscriber to the main center HZ , z. B. the voter ASi of the free Amtsleitimg AL, stimulated and adjusts to the cross connection. The identification is as follows: Since the contact 299 k _{s is} closed, there is the following circuit (Fig. 3): earth, battery, resistance W _lis contact 299 k ₃ , d-arm of the QW, winding I of the delay relay D ₃ , earth. Relay D ₃ responds in this circuit. The relay D ₃ closes its contact 291 d _a , so that the following test circuit for the relays C ₁ and R of the exchange dialer AS ₁ comes about: Earth, battery, contacts 291 d ₃ , 293 approx _1; Line 294 (Fig. 3 and Fig. 2), d-arm of AS ₁ , contact 26 r, winding I of relay C ₁ , winding II of relay R, earth.

_{Relay C 1} responds in this circuit.

The rest of the operation is the same as for outgoing exchange for a subscriber in the main office. The relay Cag is triggered in the following circuits: earth, battery, relay Cag, contacts 295 pr ₃ , 296 V ₃ , winding Co ₁ , line 297 (Fig. 3, Fig. 2), switching arm c of AS ₁ , contact 36 s, winding II of relay C ₁ , contact 30 C ₁ , earth. In this circuit, the relay Cag responds and switches through its contacts 298 cag and 299 cag the line coming from the exchange dialer to the cross-connecting line QVL . By opening the contacts 600 cag and 601 cag , the lines 602 and 603 leading to the cross-connection selector QW are disconnected. The c wire is separated by contact 223 cag , so that the relay C _{3 of} the cross-connection selector drops out, whereby the contacts 227 C ₃ and 22Sc _{3 are} opened again. A connection has thus been established between a subscriber in the secondary center NZ and the exchange. The identification of the authority authorization of the calling subscriber in the secondary center NZ is carried out in the following way: If the calling subscriber in the secondary center NZ is not authorized to officiate, go is on the / -arm of the Qi ^ ₂ for him through the resistor W ₁₃ voltage, so that for the test relay Pr ₁ . The following circuit is established: Earth, battery, resistor H ^ ₁₃ , contact of the calling subscriber, switching arm / QW ₂ , contact 341 ^ ₄ , switching arm α of the follower with the rotary magnet DII, contact 342 / T ₄ , winding II and III of the relay Pr ₄ ,, contact 345 V ₄ , earth. In this circuit, the relay Pr ₄ responds and short-circuits its winding II through its contact 343 pr _4. Via its contact 344 /> r ₄ it is held and by its contact 362 / T _{4 it separates} the circuit of the relay ^ ₄ , so that the relay 6 " ₄ drops out and thereby triggers the cross-connection selector QW _S , as already described will.

If the calling subscriber of the secondary center NZ is authorized to act, there is no voltage at his no connection on the / arm of the QW ₂ , so that the relay Pr ₄ does not respond and the triggering cannot take place.

115 12. Making an incoming

Exchange connection for one
Subscriber to the subsidiary center NZ

If an exchange call arrives for a subscriber in the secondary exchange NZ in the main exchange in which the exchange lines terminate,

so, as already described when establishing an incoming exchange connection for a subscriber in the main center, the officer sets the exchange dialer AS ₁ on the cross-connection line. In this case, the circuit described under point Ii is established again for the relay Cag. This relay responds and, by closing its contacts 298 cag and 289 cag, switches the lines coming from the exchange dialer AS ₁ through to the cross-connection line. The relay S _{3 of} the main center comes in this case via the line b or α and the contacts 6o4cag and 605 H ₁ to respond. As previously described, earth is connected to this circuit via relay A ₁ and contacts 30Ox ₄ , 302 s ₅ , 375 J ₄ . In this circuit, the relays S ₃ (Fig. 3) and A _t (Fig. 4) respond. When the relay Cag responds (Fig. 3), the contact 610 cag has been closed, so that the rush relay J ₄₁ is triggered in the following circuits: Earth, battery, J ₄₁ , contact 610 Ca ₁ , line 294 (Fig. 3 and Fig. 2), switching arm d of the AS ₁ , closed contact 150 R (button), closed impulse contact 151 ik, earth., Through contact 293Ca ₁ , the multiple circuit of the wire used to transmit the current impulses has been canceled. The contact 151 ik is actuated when the current impulse is given, and the relay J ₄₁ responds as a result intermittently. Via its contact 605 J ₄₁ , the relay J ₁ transmits these current impulses to the current impulse receiving relay A _{1 of} the JN level center NZ (FIG. 4). Via contact 313 a ₄ , the rotary magnet DQW _{2 of} the cross-connection selector QÄ ^7. , The secondary center (Fig. 4) is operated, so that this selector, as already described, is set to the calling subscriber. The checking, calling and the procedures for reporting the subscriber are the same as previously described.

If the called subscriber avoids himself from the secondary center NZ, the relay J ₄ responds again and, by closing its contact 361 i ₄ , causes voltage to be applied to the b or α wire of the cross-connection line. This causes the relay A. _s in the main control center (Fig. 3) to respond. The relay A ₃ switches on the delay relay Sh via its contact 620 a _s . This relay is triggered in the following circuit: earth, battery, relay Sh, contacts 620 a ₃ , 02ICCg-, earth. The contacts 296 V ₃ and 295 pr ₃ in the circuit of the relay Cag are bridged by the contact sh. The cross-connection line to the exchange line is switched through by the contacts 623 sh and 624.5 / 1, so that the relay 5 "is activated in the main control center. The relay 6 ¹ causes a monitoring signal, not shown, to be switched on - by which the officer can recognize that the subscriber has reported to the secondary center NZ.

For the purpose of identifying the official authorization of the subscriber called by the civil servant in the secondary center NZ , the cross-connection dialer QW of the main center runs along with the setting of the cross-connection dialer QW \ in the secondary center. The current impulses transmitted to the relay J _{41 of} the main control center are transmitted to the rotary magnet DQW _{via the contact 6301 41} in the following circuit: earth, battery, rotary magnet DQW, contacts 63Oi ₄₁ , 282 ^ 3, earth. The cross-connection selector QW is accordingly set synchronously with the cross-connection selector of the secondary center and, via its switching arm e, causes the subscriber's office authorization to be identified. If the subscriber to be called is not authorized to officiate, there is voltage on the contact bank of the switching arm e of the cross-connection selector QW ' in the main control center via the resistor W ₁₅ , so that after setting the QW to the subscriber connection of the go sub-control center, the relay Pr ₃ in following circuit comes to the response: earth, battery, resistor W ₁₅ , switching arms of the QW, contact 635 pr ₃ , windings III and II of the relay PV ₃ , contacts 636 cag, 637 v _A , earth. The relay Pr ₃ responds in this circuit and is held by its drag contact 638 ^ r ₃ . Through its contact 295 ^ r ₃ , the relay Pr _{3 separates} the line 297, so that the dialer is triggered. In this case, no exchange connection is established.

If the called subscriber of the secondary center NZ is authorized to act, there is no voltage on the contact of the cross-connection selector QW assigned to him, so that the circuit for the relay Pr ₃ does not come about and the triggering of the exchange dialer is not effected.

13. Switch to

If a subscriber of the extension center NZ called by the officer is busy, the officer has the option of connecting to this subscriber and disconnecting him. The activation takes place as follows:

For this purpose, the officer presses the AT button and thereby applies voltage to the a- or & -wire of the cross-connection line via the resistor W ₁₅ . This speaks

the relay B ₅ in the secondary control room NZ in the following circuit: earth, battery, resistor W ₁₅ , button AT, a- or fr-wire of the cross-connection line, contact 360 i ₄ , relay B ₅ , contacts 385 ^ 5, 386j ₄ , 387 cag, earth. By opening the contacts 332 b ₅ and 388 b ₅ and closing the contacts 389O ₅ and 390 b ₅ , the officer switches to the called subscriber. The officer informs the participant that he is required by the office and has the option of severing the existing connection for the participant.

14. Separate

In order to break the existing connection for the called subscriber of the secondary center NZ , the officer releases the button AT , and this causes the relay B ₅ to drop out, ie the contact 395 b ₅ is closed, so that the following circuit for the relay Dr ₄ , comes about: earth, battery, winding III of the relay Dr ₄ , contacts 395 ^ 5> 39 ¹ ^ of the delayed releasing _{relay Vh 4} (the relay Vh ₄ has come to the following circuit: earth, battery, relay Vh ₄ , ' Contacts 392 ^ ₅ , 393ir _4> 394 ^ 4. 395 ^ 5. 39 ⁶ ^. Earth), contacts 393 ^ 4. 394 ^ 4, 395 ^ 5 »39 ⁶ ^. Earth. In this circuit, the relay Dr ₄ responds and closes its contact 397 dr ₄ , so that a circuit for the thermal relay Th _{4 is} closed; the circuit also runs to earth via contact 3963 ^. The relay Dr ₄ remains on its contact 710 dr ₄ until it is brought to waste by opening the contact 393 ir _4. The thermal relay Th ₄ is heated in this circuit and, after it has responded, actuates its contact 700 th ₄ , so that a circuit for the relay Tr _4, which is designed as a delay relay, is closed. This circuit also runs to earth _{via contact 39Oy 4.} The relay Tr ₄ operates its contacts 701 ir ₄ , 703 tr ₄ and 702 tr ₄ . Voltage is applied to the subscriber's α wire via contact 701 ir ₄ , while earth is applied to the b _{and c wire via contact 703 ir 4.} As a result, the existing connection for the subscriber in the secondary center NZ is broken. The relay E _{4 is switched} on via its winding II via contact 702 tr _4. The contact 340 e ₄ is thereby closed, so that the relay C _{5 is activated} in the circuit already described above. The relay C ₅ here again has the same functions as when establishing a normal connection via the Ouerverbindungswähler QW ₂ to a subscriber in the secondary center.

15. Establishing an inquiry connection for a subscriber in the secondary exchange NZ in his own exchange

If there is an exchange connection for a subscriber in the secondary center NZ , he has the option of holding inquiries with a subscriber in his center as well as with a subscriber in the main center HZ. The following describes the establishment of an inquiry connection within the secondary center NZ . For this purpose, z. B. the subscriber iV ₃ his inquiry button Ta ₅ and thereby places earth in a known manner on the a- and fr-wire of his connection line. Since the connection line is connected to the exchange line via the Ouerverbindungswähler QW ₂ , it brings the relay X ₄ , which is designed in a known manner as a differential relay, by short-circuiting the winding II of this relay to respond. When relay X ' _{4 responds} , contact 711 ^ 4 is closed so that the following circuit is closed for winding I of relay F ₄ : earth, battery, winding I of relay F ₄ , contacts 712 S ₄ , 713Jf ₅ , 714 ^, 715 ^ 7, 711 x ₄ , earth. In this circuit, the relay F ₄ responds and actuates its contact 71Oy ₄ . This prepares a circuit for winding II of relay F ₄ and I of relay Z _4. After releasing the button Ta ₅ by the participant JV ₃ , the relay X ₄ drops out again, so that the short circuit existing for the winding II of the relay F ₄ and I of the relay Z _{4 is canceled.} This causes the relay Z ₄ to respond and closes its drag contact 717 S ₄ , so that the relay Z ₄ is held by its windings II and I. The winding I of relay Z ₄ is connected to earth via contact 719C ₅ and contact 720 x _5. By opening its contacts 721 Z ₄ and 722 2 ₄ and closing contacts 723 s ₄ and 724 ^ _4, relay Z ₄ has transferred the line coming from the subscriber to wires 725 and 726 of the consultation connection. The consultation connection leads in a known manner to the call seeker of the house unit of the secondary center NZ. The call searcher AS ₂ runs on the consultation connection, and the subscriber of the secondary center NZ dials in a known manner the connection number of the subscriber with which consultation is to be held. The procedures here are the same as when establishing a house connection.

If the consultation call is ended, the subscriber N _{3 of} the secondary center NZ presses his key Ta _{5 again} , causing the relay .Y ₄ (FIG. 4) to respond again

i6

comes. Since the contact 711 X ₁ is closed again, the windings II of the relay F ₄ and I of the relay Z _{4 are} short-circuited, so that the relay Y ₁ drops out. If the subscriber releases his key again, the circuit for winding II of relay Z _{4 is also} disconnected, so that relay Z ₄ drops out and the inquiry connection is disconnected by opening contacts 723 # ₄ and 724.S _4.

The ones sent out to adjust the connection devices of the main system Number current surges are applied to the cross-connection line not effective because the Kk

Contact

the contact 360J ₄ bridged.

16. Establishing an inquiry connection for a subscriber in the secondary center NZ with a subscriber in the main center HZ 20

If the subscriber of the secondary center NZ is connected to the office via the trunk line ending in the main center HZ and the subscriber wishes to have a query with a subscriber, e.g. B. N ₃ to hold the main center HZ , he presses, as described under 15, his key Ta ₅ for a long time. Since relay X ₄ responds in this case, contact 730 λγ _{4 is} closed, so that the _{following circuit is established for thermal relay TA 41} : Earth, battery, relay Th ₄₁ , contacts 731 X ₅ , 732.V ₇ , 730 x _ir earth. The thermal relay TA ₄₁ is heated in this circuit. When establishing an inquiry connection within the secondary control center, as described under point 15, the time required to press button Ta _{5 is} not sufficient to bring relay TA ₄₁ to heat up. _{If the relay TA 41 is made} to respond when the button is pressed for a longer period of time, it closes its contact 733 th ₄₁ and thus the following circuit for relay X ₅ : earth, battery, winding I of relay X ₅ , contacts 734 ^ r ₀ , 733 th _ilt earth. The relay X ₅ responds in this circuit via its winding I and opens its contact 713X; By closing contact 735 ^ 5, contact 7i4'X _{e is} bridged. The participant Λ ^Γ _{3 of} the secondary center must press the Ta ₅ key until he hears a ticker; this is transmitted to him as follows:

By closing contact 740 X ₅ , he receives the ticker _{from Ti 4} via contacts 741 X ₁ , 740 x _s and buzzer winding III of relay J _4. Then the subscriber releases the key again, so that the contact 711 -T ₄ is opened again. As a result, the relay X ₀ responds via its winding I in the following circuit: earth, battery, winding I of relay X ₅ , contact 734 x _t , winding II of relay X ₅ , winding I of relay X ₆ , contacts 740 ^ r ₇ , 741 ^ ₅ , 719C ₅ , earth. The relay X ₆ responds in this circuit and holds itself to earth via its windings II and I via contact 719C ₅ . As long as the inquiry button is pressed by the participant, the contact 300 x ₄ in the circuit of the relay A ^ is open. When relay X ₃ responded, contact 301 x _{5 was} opened, so that the earth was removed from the 0 or & -Ader of the cross-connection line and relay S ₃ (in FIG. 3) drops out. When relay 6 " ₃ drops out, contact 640 s _{3 is} closed, so that, since contact 641 sh is closed, the following circuit for relay F _{3 is} closed: earth, battery, ReIaIsF ₈ , contacts 64Oi ₃ , 641 sh, 620 a _s , 621 cag, earth In this circuit the relay F _{3 is} activated, so that by closing the contact 642/3 earth is connected to the α-wire which is connected to the exchange dialer AS ₁ Way, as if a participant of the main center HZ presses his inquiry button, the inquiry criterion is given to the inquiry center in the exchange line, so that the relay X comes to response via its winding I and voltage on the winding I of the relay S. The relay X conducts in In a known manner, as also described when establishing inquiry connections within the main control center, the inquiry is entered.

If the subscriber in the secondary center NZ lets go of his key after hearing the ticker, the relay X ₄ falls again and closes its contact 300 X ₁ (FIG. 4). As a result, the relay S ₃ (Fig. 3) in the main control center _{responds again and opens its contact 640 J 3} and thus the circuit of the relay F ₃ . This also opens the contact 642/3 again (corresponds to the release of the button by a subscriber in the main control center after the query has been initiated in this control center). The relay X of the main control center drops out again, and the inquiry lines in the main control center are via the contacts 845 'and 833; connected to the line coming from the subscriber. In a known manner, contact 883; the throttle DrI is placed in the exchange line so that the exchange connection does not collapse during the inquiry.

If the consultation call between the subscriber in the secondary center NZ and the subscriber in the main center HZ has ended, the subscriber presses Λ ^τ ₃ again

Ta ₅ key . This causes relay Xi (Fig. 4) to respond and opens its contact 300 x _t . This again causes the same switching operations that have already been described, ie there is a switch back from the inquiry connection of the main center to the exchange line, so that the subscriber in the secondary center NZ is connected to the office again. Since the relays X ₅ and X _e correspond to the relays F ₄ and Z ₄ , which are provided for the establishment of inquiry calls within the secondary center NZ , they work in the same way and are brought back into the rest position accordingly.

It has been described as an inquiry path in the secondary center and an inquiry path is reached in the main office.

One of these inquiry channels can also stimulate an office voter when it is occupied, so that an inquiry is held in the office,

17. · Transfer of an exchange connection by a subscriber in the secondary exchange to a subscriber in the secondary center with whom 'inquiry is held.

Has z. B. the subscriber N _{3 of} the secondary center NZ with the subscriber Ni of this center a consultation call, as described under point 15, and if it is desired that this call is transferred to the subscriber with whom the inquiry is held, this is done as follows:

For the purpose of transferring the exchange connection to the subscriber with whom the inquiry is being held, the inquiring participant asks him to press the transfer key. Then the i? £ / ₄ relay, which is designed as a differential relay, responds via its winding II. The circuit is closed via contact 7SOcZr ₄ . The relay Dr ₁ has responded via the loop via its windings I and II (contact 752 i _A is closed). The relay RÜ _{t separates} its winding I via contact 753 ^ ₄ and applies winding I of the relay R _s to the & -wire of the inquiry connection via contact 754 rw _4. Now lets the subscriber who the. If you want to bring about a transfer, release the button again, so the relay R ₅ comes through its winding I and voltage through contact 750 dr _A to respond. By closing its contact 382 r _s , the relay R _s causes the rotary solenoid DQW _{2 of} the cross-connection selector QW _{2 to be switched on} in the following circuits: earth, battery, rotary solenoid DQW ₂ , contacts 383C ₅ , 382 ^, relay breaker RUi, earth. The cross-connection selector QW ₂ is switched on until it has reached the subscriber's connection line to whom the connection is to be transferred. The following test circuit is established via the d-arm of the QW ₂ : earth, winding III of relay C ₅ , winding II of relay R ₅ , contact 755 r ₅ , 7 <> switching arm d of QW ₂ , line 757 (Fig. 4 , Fig. S), switching arm d of the LW ₂ , winding of the relay P _{5 of} the house control center, switching arm d of the AS _{2 of} the house control center on the inquiry connection, line 756 (Fig. 5), line 756 (Fig. 4), contact 757rii ₄ , Resistor W ₂₀ , battery, earth. In this circuit, the relay C ₅ responds and blocks in a known manner by closing its contact 350 C ₅ via the c-wire. The relay C ₅ was no longer addressed because the relay F _{4 was} already addressed when the connection was established and the contact 342 y _{4 was} open; contact 760 r _{5 was also} open. The relays F ₄ and Z ₄ , which, as described under point 15, are addressed for the purpose of establishing the inquiry connection, are caused to drop out by opening the contact 719 C _5.

When relay P ₅ is triggered, the house unit collapses, as has already been described in connection with the connection devices of the main control center. The external call is thus transferred to the subscriber with whom the inquiry was held via the cross-connection selector QW _2. The first participant can now hang up, as the transfer of the connection is indicated to him by transmitting a character.

The transfer of an exchange connection to a subscriber in the secondary center was accordingly carried out with the aid of the Ouer connection selector QW ₂ .

After the connection has been completed, the external connection dialer QPf ^ ₂ and the exchange line dialer AS _{1 are released} in the following way: The devices provided for cross-connection traffic and, in this case, occupied devices are released in the same way as described above for the establishment of cross-connections. The trunk dialer AS ₁ is triggered as follows: When the relay A _s in the main control center drops out , the relay Sh is made to drop out, so that the contacts 624.sk and 623 sh are opened. However, this is the same criterion as wen-η a subscriber in the main center HZ hangs up his receiver after making an exchange call. In this way, the public voter is released.

i8

i8. Transferring an exchange connection for a subscriber in the secondary center NZ to a subscriber

HauptzentraleifZ If a subscriber in the secondary center NZ who is on an outside call, as described under point 16, has a query with a subscriber in the main center HZ and should make the outside call to the subscriber

ίο the main control center are transferred, this is done in the following way: The subscriber in the main control center presses his transfer key and, as already described at the beginning, causes the relay U ₁ (Fig. 2) to respond. As a result, the exchange dialer AS _{1 is} stimulated in the same way as when switching connections within the house control center and adjusts itself to the subscriber's connection line to which the exchange connection is to be switched.

The fact that the exchange dialer leaves the busy lines via which the cross-connection line is reached, the cross-connection collapses, and the exchange call is transferred to the subscriber in the main switchboard. The subscriber in the secondary center NZ then receives the official signal again to indicate that the transfer has been effected.

" ₀ 19, establishment of an inquiry connection by a subscriber in the main control center with a subscriber in the secondary control center

If a subscriber in the main control center who is on the outside call wishes to hold a query with a subscriber in the secondary control center, he / she queries within the main control center in a known manner and sets the line selector LW of the house unit of the main control center by dialing the code for a cross connection via the query connection, in the same way as when making ordinary cross-connections. The cross-connection selector QW ₁ sets itself to the consultation connection occupied by the subscriber in the main control center, in the following way: Since the relay An ₁ (Fig. 2) has been activated by setting the LW to the cross-connection connection, the contact 215 is «% Closed, so that the following test circuit is established via the rf arm of the cross-connection selector QW : earth, battery, resistor W ₁₁ , contact 215OM ₁ , switch arm rf of the LW, winding II of relay P ₁ , switch arm d of the AS in Position 10, line 180 (Fig. 2 and Fig. 3), d- arm of the Guer connection selector QW, contacts 211 k ₃ , 210r ₃ , winding II of relay R ₃ , winding III of relay C ₃ , earth. In this circuit, the relay C ₃ 'responds and brings about the same switching action as when establishing a normal cross-connection, which is described under point 4. In this case, too, the house unit collapses, and the subscriber who wants to hold a query, 'sets the cross-connection _{S'selector QW 2 of} the secondary' control center to a participant of this control center by sending out a corresponding series of current impulses.

20. Transfer of an existing one for a subscriber in the main office Exchange connection to a subscriber in the secondary center

If the outside call is to be transferred to the subscriber in the secondary center, with whom the inquiry is being held, the subscriber in the secondary center presses his transfer key again and must press it until he receives the ticker symbol. Then the relay D ₃ addresses the following circuits: earth contact _660/3, winding II of the delay relay _D3, contacts

661 k ₃ , 227C ₃ , switching arm α of the QW, line

662 (Fig. 3 and Fig. 2), winding I of the relay U ₁ , contact 90 dr _t , battery, earth. In this circuit, relay D ₃ responds and closes a holding circuit via contact 663 d _3. The impulse relay J _{3 is} switched off via the contacts 664 ^ 3 and 665 d _s. The relay U ₁ of FIG. 2 initiates the same switching operations as is described for the establishment of an inquiry connection. As a result, the exchange dialer AS ₁ starts up and adjusts itself to the cross-connection line. This identification is carried out as follows: By closing the contact 291 d ₃ , voltage is applied to the line 294 so that, as already described, the exchange dialer AS _{1 can} check again via the d-arm. After the test is finished, the relay Cag responds again, as already described, and this causes the relay Sh to respond, which via its contacts 624 sh and 623 sfc causes the connection of the cross-connection line, while the relay Cag via its contacts 298 cag and 299 cag causes the connection. The relay C ₃ is caused to drop out again by opening the contact cag ″, so that the relay D _{3 also} drops out. The connection has thus been switched from the subscriber in the main control center to the subscriber in the secondary control center.

21. Flickering by a subscriber in the secondary center NZ

Under point 8 it has already been described in which way the Main headquarters has the opportunity to

to flicker to the officer. If a subscriber in the secondary center, who is in the public call, wants to flicker to the officer, this is done in the following way: The subscriber in the secondary center, on the other hand, has to hold his inquiry key if he wants to hold an inquiry in his own center where he presses the key only briefly presses or, in contrast to where he wants to hold a query within the main center HZ and presses the key until a ticker symbol is transmitted, press it longer, until he receives a second ticker symbol.

As has already been described under point i6 when a subscriber in the secondary center was established with a subscriber in the main center, the subscriber in the secondary center had released the button after receiving a ticker. For the purpose of the flickering, he must, as already described, press the button longer. Since the participant presses the button beyond the first ticker symbol, the thermal contact TH ₅ is also heated up after the contact 760.T ₅ closes in the following circuits: Earth, battery, thermal contact TH ₅ , contacts / 6ox ₅ , 732.T ₇ , 73Ox ₄ , earth. The thermal _{relay TA 5} closes its contact 761 th ₅ and thus, since the contact 762 x _{s is} closed, the following circuit of the relay X ₇ : earth, battery, relay X ₇₁ contacts 761 i /%, 762x5, earth. The relay X ₇ responds in this circuit, closes its contact 763X ₇ and maintains this contact. By opening the contacts 715 X ₇ and 740 x ₇ , the relay Λ ~ 5 is made to drop out. By opening the contact 303X ₇ , earth is removed from the a or fr wire of the cross-connection line, so that the relay S ₃ in the main control center HZ is made to drop out. This brought about 640J contact _3, the relay -F ₃ to respond, as previously described, and closes its contact _642/3. This puts earth on the α-wire, so that we have the same criterion again as if a subscriber in the main control room presses the flak button for a long time. In this way, the flickering signal is then transmitted to the officer in the same way as when flickering by a participant in the main office. The flickering process within the main control center is described under point 8.

22. Identification of the authorization of the individual participants regarding the establishment of exchange and cross-connection

In FIG. 6 of the drawing, the identification of the individual subscribers with regard to their authorization to establish office and cross connections has been shown in particular. The contact banks of the forests QfF, AS and AS ₁ , on which the c-arm runs, and the contact banks of these voters, which are swept by the rf-arm, have been shown. The participants are divided into six groups. The individual groups have the following traffic rights:

Group I. The participants in this group are authorized to make external calls and Establish cross connections.

Group II. The participants in this group are entitled to trunk connections, but not Establish cross connections.

Group III. The participants in this group are not authorized to make trunk connections. but cross connections.

Group IV. The participants in this group are also not authorized to make trunk connections but are not allowed to establish any cross-connections.

Group V. The participants in this group have limited authority, i.e. you can only with the help of the civil servant official connections and are allowed to establish cross connections.

Group VI. The participants in this group have limited official rights and are allowed to do so do not make any cross connections.

The c- cores of the subscriber connection lines of the subscribers in group I are connected in such a way that they can be reached by the officer via the c-arm of the exchange dialer AS _x , i.e. the line at point 4 in the contact bank of AS ₁ is via point 1 , 2. connected and is also connected to contact 4 of the contact bank of the c ~ arm of the cross-connection selector QW, so that the subscriber relay T of group I can be held or reached via this.

Since the d-wire of the subscriber of the group I to both the d-arm of the cross-connection selector QW can also be achieved on the d- arm of the AS of the home unit and the D arm of Official selector AS ₁ as and not reverse resistance (20 ohms) have, can the relay C and R of the local voter or re no relay C and R aufprüfen of Ouerverbindungswählers over these lines, meaning it can Administrative and cross connections.

The c-cores of the subscribers of group II are only connected to the contact bank of the c-arm of the exchange connection dialer AS ₁ and not to the contact bank of the cross-connection dialer QW, ie they are only authorized to operate.

The multiple wiring of the contact banks of the three voters on which the rf arms

run, is via a resistor (20 ohms) and a contact to earth, so that the relays C and R of the cross-connection selector are short-circuited when making cross-connections and cannot respond. External connections can be established by the participants in this group, as the contact on is then open.

The c-cores of the subscribers in group III are not connected to the exchange line dialer AS ₁ , but they are connected to the QW, ie these subscribers are authorized to cross-connect. The d-wires of the participants in group III are connected to earth via a 0% channel. Since the contact at _t is open when cross-connections are established, these connections can be established, since the relays C and R of the cross-connection selector QW are not short-circuited. Exchange traffic is prevented for these subscribers because relays C and R of the exchange dialer are short-circuited.

The c-cores of the participants in group IV are not connected to the QW and also not to the AS ₁ , ie the participants in this group are neither cross-connection nor authorized to operate. Since the multiple wiring of the (i-wire is connected directly to earth via a resistor, relays C and R are short-circuited in both cases.

The c-wires of the participants in group -V are like the c-wires of the participants in group I connected through points 3, 2 and 1, but the multiple wiring of the (i-wires of the participants in this group is via an a% contact on earth, that is able to produce cross-links; which aufprüfen compounds in the manufacture of its own motion, C and R, but shorted relay, but these devices can be accessed via the C arm of the aS ₁ of the official, since their performance. as already described, are switched through between points 1 and 2.
The c-cores of the subscribers in group VI are not connected to the QW, ie "these subscribers are not authorized to cross-connect However, these subscribers can be reached via the c-arm of the trunk connection selector AS ₁ , as their c-wires are connected through between points 1 and 2.

23. Connection traffic between two main centers

In Fig. 7 a circuit diagram is shown, which the two main centers I and II shows. Trunk lines end in both main centers. Between the two main centers are via line 5 in the same way as between a main office and a secondary center, cross-connections are possible.

Incoming external calls in both exchanges are for both subscribers of the Establish a control center in which the exchange line ends, as well as via the cross-connection line 5 with participants from the other control center.

Furthermore, there is the possibility that the outgoing traffic for subscribers of each of the two main centers runs via the trunk lines ending in its center or via the cross-connection line and the trunk lines ending in the other center. If a subscriber of the main control center I is in an exchange call, he has the option of influencing the inquiry switchover point y ₂ to hold an inquiry within his control center. He can also hold a query with a subscriber in the main control center II via the cross-connection selector QW ₁ and the cross-connection selector QW _{2 of the main control center II.}

If an exchange connection is established for a subscriber in the main center II via an exchange line ending in the main center I and the cross connection line 5, then this subscriber can hold an inquiry with a subscriber in his center by influencing the inquiry switchover y _a to keep a subscriber of the main center I. In this case he can influence the inquiry switchover point y _{2 of} the main control center I.

Conversely, the corresponding inquiry stations for a subscriber in the main control center I who have a connection via an in the main center II ending trunk line and the cross connection line 5 has to be reached.

Otherwise, the same conditions apply to the arrangement shown in FIG as for the connection traffic between the main control center and the secondary control center applicable.

Claims (9)

Patent claims: i. Circuit arrangement for telephone systems with several exchanges and connection points of different traffic authorization, characterized in that, when a connection path is set up via several exchanges, dialers (QW) in an exchange (HZ) located in front of the end exchange (NZ ), via which when connecting fertilize opposite traffic direction junctions in this exchange can be reached, check the traffic authorization of the desired connection point. 2. Circuit arrangement according to claim i, characterized in that the switching means for identifying the traffic authorization (QW) in that of the in to series lying exchanges are arranged in the connecting lines (Trunk lines) with which only participants with a certain traffic authorization are connected to be allowed to. 3. Circuit arrangement according to claim 1, characterized in that when establishing a connection path to a further exchange (NZ) of the network switching means (Cag ) switch off the selector from the connection line to the next exchange (NZ) and its setting device under the influence of receiving devices for numbers -Bring electric surges. 4 .. Circuit arrangement according to claim 1, characterized in that the selector [QlV) also determines the traffic authorization of the subscribers connected in the exchange (HZ) in which it is arranged. 5. Scarf processing arrangement according to claim 3, characterized in that the receiving devices (J ₄₁ ) also number current surges to the voters (QlVo) of the next exchange (NZ) are transmitted and controlled on a switching path (J-arm of AS ₁ ) , the runs parallel to the speech path between the incoming connection line and the connection line leading to the next exchange (NZ). 6. Circuit arrangement according to claim 3 and 5, characterized in that the incoming number current surges run over a switching arm (d) of a selector (AS ₁ ) , through which the test circuit runs for connections in opposite traffic directions to determine a calling connection line. 7 · Circuit arrangement according to claim 6, characterized in that when occupied of the impulse transmitter switching means (Ca relay) become effective, which one Multiple switching of the wire used to transmit the current surges cancels. 8. Circuit arrangement according to claim i, characterized in that upon detection of a traffic authorization not applicable to the established connection of the selected connection point from the identification device (QW) controlled switching means (Pr _s ) cause the separation of the established connection path. 9. Circuit arrangement according to claim 1, characterized in that the switching means (Pr) causes the release of the continuing connecting line (AVL) and the connecting devices (QW ₂ ) reached via this. In addition 5 sheets of drawings BERLIN. GKDItUCKT IN DEIt