DE633295C - Circuit arrangement for telephone systems with connection points of different classes - Google Patents

Description

The invention relates to a circuit arrangement for telephone systems in which connection points of different classes to a common exchange be connected and the purpose of an officer monitoring the connections is the class affiliation of a called connection point in a safe and easy way without z. B. the number switch of the connection points "to be specially designed structurally, to be identified.

According to the invention, this purpose is achieved in that the connection of the Device for marking the connection point under the influence of the in the switching center for calling the connection point is provided, that their shutdown is delayed after notification of the called connection point (picking up the

jo microtelephons) 'takes place.

The arrangement according to the invention is to be based on an exemplary embodiment in the following are explained in more detail.

In the drawings is omitted

As all parts that are not essential to the concept of the invention, an embodiment of the invention is shown. Fig. 1 shows a connection point to be specially identified in incoming traffic, namely a coin-operated telephone station N, the facilities assigned to this in the exchange and a connection path to a reporting point, while in Fig. 2 the dialer to be set by a telephonist for connections to the coin-operated telephone station N are shown.

By removing the microphone from the calling subscriber station Λ ^Γ , a circuit for the relay A arranged in the transformer of the connection point is closed in a known manner: earth, battery, winding I of relay A, subscriber line α, coin-operated telephone station N, subscriber line ö, winding-11 of relay A, earth. Relay A responds and, by switching over its contact Ci _1, causes relay C to respond via: earth, battery, resistance Wi, relay C, normally open _{contact Ci 1} , earth. By closing the contact C ₂ , the bridge arranged in the transformer between the two connecting lines is closed via the contacts C ₁ , a ₂ , choke coil Dr and normally closed contact V _1. This closes a circuit for relay R via: earth, battery, coil LA, resistance winding R, contact t _± , line a, contact c ₂ , contact a ₂ , choke coil Dr, contact V ₁ , line b, contact t _± , relay R, earth. The relay R responds and applies the battery to the rotary magnet of the preselector via its contact r _t : earth, battery, contact r _u contact i _a , rotary magnet D, interrupter Un and earth. The interrupter Un causes a step-by-step forward movement of the rotary selector until the switching arm 0 of the rotary selector has made contact with a free connecting line, whereby the relay T is connected to earth

is switched on .., .- There is then a circuit VorrErde 'on'"occupied group selector over- ·: .Prüfleitnahm c, switching arm c of the preselector, windings r and 2 of the relay T, contact r ₂ , battery, earth. The relay ^ T responds and with its contacts t _± switches the subscriber line a, b through to the free connection line leading to the group selector. At the same time, switching contact t ₂ shorts the high-resistance winding 2 of the relay T and the low-resistance winding I directly to the Battery switched, namely via: earth on the occupied selector, winding I of the relay T, contact i ₂ , switching arm d of the preselector, battery, earth, so that due to the low resistance remaining in the c-circuit, the occupied group 'selector for more calls is blocked. by switching from t ₂ finally, the circuit is interrupted for the rotary magnet D, so that the selection on the set line to the contact of a free compound Unoc and is brought. The further establishment of the connection takes place in a known manner by actuating a current impulse transmitter on the connection point N, its number current impulses over the bridge located in the transformer (relay V is energized with the first current impulse of each current impulse series and remains during each current impulse series) and the selected preselector are transmitted to the occupied group selector, and which in a known manner cause the group selector to be set to a reporting point in the remote office.

The registration officer takes the order of the calling subscriber after production towards a long-distance connection! and gives this by means of a special connection device, a slip tube mail or the like a remote officer. The calling Teibienmerstelle now has the microphone and thereby the release of the connection device that establishes the connection to the reporting station · causes.

If the remote operator has received the connection to the requested remote exchange subscriber, she establishes the connection to the calling subscriber station A ^T in a known manner, namely, according to the present exemplary embodiment, via a group and line selector. The establishment of the connection can be seen in more detail in Fig. 2 and proceeds as follows:

When the connection line a ', V is occupied by an upstream selector, for example by a group selector GW, a circuit for the relay K is first closed, namely from: Earth on the occupying selector GW, winding I of the relay K ₁ contact k _v branch point x , from here, once over the windings II and III of the i ^ || ais K to the battery and the other time 'ÖJ§§I \: contact e _i and connecting line b', Jypntakt If ₁ , resistance Wi to the battery and earth. As a result of this current surge, the relay K at the outgoing end of the connecting line cannot initially be made to respond, since the winding I is connected in the opposite direction to the windings II and III.

With the first current impulse, which occurs when the calling remote officer activates the impulse transmitter, a circuit for relay E is closed via: Earth on the occupying group selector GW, winding I 'of relay E ₁ position 1 of the control switch, relay .4', battery and earth. The relays A and E respond as a result. By transferring contact e ₂ , relay E switches to a holding circuit. By opening contact e ₃ , both windings II and III of relay if are also connected to the battery via: earth on group selector GW, test line c ', contacts ^ winding II of the relay, windings II and III of relay K, so that Relay K can now respond. It opens its contact k _x and thereby switches off its winding I. By closing contact k ₂ at the same time, winding I of relay E is short-circuited and a short-circuit of winding II of relay K is prepared at contact k _s. However, this short circuit does not take effect for the time being, since the contact e _s through the relay E is open.

The relay A closes its contact ~ a \ when it is excited by the first number current surge and thereby forms a circuit for the lifting magnet H via: earth, contact O ₁ , position 1 of the control switch, lifting magnet, battery, earth, so that the selector is first raised by one step. With each subsequent number current surge, relay A is further energized or de-energized and, by pressing contact O ₁ each time, the selector is switched to the desired line group.

By closing contact a ' ₂ , relay G is energized, which by closing its contact g ₂ causes relay B to be switched on at the beginning of the series of impulses and by closing its contact g _s closes a circuit for relay C. In addition, by relocating contact ^ _1, a holding circuit for relay G _{1 is} only dependent

closed by the normally closed contact W ₁ : earth, battery, resistance Wi, contact g _u relay G, contact W ₁ , earth. The opening of S contact ^ ₁ when the relay B is energized prevents the relay F from responding until the series of current impulses has ended. After the end of the series of impulses, the relay B is switched off in a manner known per se and, as a result, by the

ίο closing of contact b _x the relay F energized as follows: earth, contact ^ ₁ , contact a ₃ , head contact of selector k (closed during the first stroke of the selector), position ι of the control switch, relay F, resistance Wi, battery and earth .

The relay F closes a circuit for the rotary magnet S of the control switch by means of its contact Z ₁ , so that it is switched from position 1 to position 2. By closing the contact S _{1 of} the control switch magnet, the relay F is short-circuited so that it immediately falls again.

In position 2 when sending the second impulse series of the rotary magnet D is the line selector is set in the same manner in effect as in the preceding current pulse series the magnetic H. After completion of the rush current row, the energization of the relay F for the purpose of forwarding is again of the control switch in the position 3, namely from: earth, contact O ₁ , contact a _s , shaft contact of the line selector (closed with the first turn of the selector), position 2 of the control switch, relay F, resistance Wi to the battery to earth.

Since the impulse transmitter of the remote office is provided with a device which automatically emits an additional impulse after the end of the last series of impulses, the relay / is energized in the following way in position 3 of the control switch: Earth, battery at the officer's place, connection line a ', Contact k _2l winding I of the transformer UB, position 3 of the control switch, winding I of the relay /, to earth. The relay / speaks on land prevents its two differential windings III from being switched on by opening its contact I _1. It is held in a holding circuit via its winding II, namely from: earth, battery, winding II of the relay /, contact i ”, position 3 of the control switch, earth. The control switch goes through the ¹ excitation of the relay F from earth via position 3 of the control switch, relay F, resistance Wi to the battery and earth in position 4, from which it moves when earth is applied in the remote office to the connecting line a ' as a result of the resulting Excitation of relay A (earth at the officer's place, connection line a ", contact k ₂ , winding I of the transformer, control switch position 4, winding II of the transformer, relay A, battery and earth) to position 5; is moved on. From here goes the switch as a result of the immediately occurring excitation of the relay F in position 6, in which the called subscriber line is checked for free and busy.

It is initially assumed that the line requested is locally manned. Then the relay P, which also carries out the test for local connections, cannot respond, because too much current is withdrawn from the test relay P of the line selector shown in the drawing on the occupied voter by short-circuiting the high-resistance winding II of the test relay, so that this does not go to Can respond. The control switch is switched from position 6 to position 7 by energizing relay F via contact a _s . In position 7 of the control switch, the relay T is connected to the test line c . The winding of the relay T is now dimensioned such that it can respond to a busy line when the switch arms of the selector are set. If the switch arms of the selector are set to a remote line, the relay T cannot respond, since in this case earth is connected directly to the test arm of the selector holding the occupancy, without the interposition of resistors, and therefore the relay T is short-circuited.

Since in the present case it was assumed that the desired line is occupied by a local connection, the relay T can be energized in the following circuits: earth, battery, winding II of relay I, contact i ₂ , relay T, contact C ₁ and earth. By closing contact t ₁ , the control switch is switched from: earth, contact b ₂ , contact t _lt position 7 of the control switch, relay F, resistor Wi, battery and earth to position 8 as a result of the resulting excitation of relay F. The control switch remains in position 8 because the relay P, as mentioned above, is not energized. The relay T also connects at its contact t ₂ the incoming wires of the connecting line with the switching arm α and b of the line selector. The remote operator can now intervene and notify the subscriber of the impending long-distance call and the disconnection of the local connection. She then lays it down for the purpose of dissolving the existing ones. Local connection battery to one branch a 'of the connecting line, whereby

033295

the relay Q is excited in the following way: battery at the officer's place, connecting line a ', contact k ₂ , winding I of the transformer UE, relay Q, position 8 of the control switch, earth.

Relay Q responds and, by closing its contact q _±, excites relay F via the following circuit: Earth, contacts b ₂ , t _it qu _lt position 8 of the control switch. Relay F, resistor Wi, battery and earth and thereby causes the control switch to switch to position 9, in which the existing local connection is triggered by connecting earth to both outgoing speech wires: earth, position 9 of the control switch, contact t ₂ , speech wires b and earth, position 9 of the control switch, contact ig, speech wire a.

In position 9 of the switch, the test relay P is again connected to the test line c of the desired subscriber station. The relay P can now respond to the 25 'response after the existing local connection has been terminated and, by closing its contact P ₁ , causes its high-resistance winding I to be short-circuited and, by energizing the relay F via its contact p _2, causes the control switch to be switched to the position 10.

In position 10 of the control switch, relay B ' is energized as follows: earth, contact J ₃ , relay JS', contact c ' ₂ , position 10 of the control switch, tripping magnet M, battery, earth. In this circuit, only the relay E 'can respond, but not the tripping magnet M _1, since the current is insufficient to ^{excite this magnet 1.} By closing its contact e _x, the relay E ' switches the test line c directly to earth and thereby keeps the selected connection line occupied. It also excites relay 0 via its contact e ' ₂ : earth, battery, relay O, contact e' _% , break contact a \ and earth. The relay 0 opens its contact and, by closing its contact O ₂ , prepares a circuit for the relay Q , which is re- energized by pressing a button T on the part of the officer in the following way: Earth at the officer's place. Button T, connecting line a ', contact k ₂ , winding I of the transformer UE, relay Q, position 10 of the control switch, contact O ₂ , battery, earth. The relay Q responds and applies ringing current to the subscriber line by closing the contact-g _2. This ringing current takes the following course: AC power source, contact q ₂ , position 10 of the control switch, contact t ₂ , speech wire α of the subscriber line, connection point N, speech wire b of the subscriber line, contact t ₂ , contacts q _s , t _s , b _s , earth. The call organ of subscriber station N is actuated.

At the same time, the alternating current relay R ' arranged in the transformer assigned to the coin-operated telephone station JV is excited in the following way by the call current: AC power source, contact q _ä , position 10 of the control switch, contact t ₂ , voice wire a of the subscriber line, contact C ₂ in the transformer, capacitor, Relay R ', voice wire b of the subscriber line, contacts t ₂ , q _s , t ₃ , b _s , earth. The relay R ' responds and, by closing its contact r \, excites the relay H, which applies a signal buzzer to the induction winding III of the relay A by means of its contact Zi _1. By closing the contact h ₂ , a holding circuit for the relay H is closed at the same time. The buzzer signal generated by the activation of the signal buzzer is inductively transmitted to the windings I and Hi of the relay A and from these via the connection line to the remote officer, who recognizes the characteristic sign of Sem that the called subscriber station N, which had requested the remote connection, - one belongs to a particularly distinctive type and, z. B. as in the present embodiment, is designed as a payphone.

The officer can therefore with certainty without further inquiry, the one to be paid for the connection Credit the correct amount of the fee. Participant positions of various Class affiliations can in this way be connected to the same exchange without a special one Handling of the remote connections to the microphone units to be specially marked is required.

The placed through the call flow to effect signal buzzer will remain in office until a circuit for the relay A is closed by removing the Mikrotelephons from the supporting fork by the participant N which _t by closing its contact a in the manner already explained a circuit for relay C closes. Relay C responds and, by _{moving its contact C 2,} interrupts the circuit for relay 2? ', Which disconnects winding I of relay H by opening its contact r {.

By closing the contact C ₃ , a circuit for the thermal relay Th is also closed, which responds after a certain time and which by the closing of its contact Hi _x a short circuit of the winding II

of the relay H brings about, so that this comes to waste. The thermal relay Th is provided for the purpose, so that the signal buzzer fork of the connection point N even with a once taking place upon arrival of the first call acceptance of the micro Telephones of the Auflage-- ^'1 for sufficient for reliable detection of the signal: is time to impact. The contact A ₁ switching on the signal buzzer is therefore opened with a delay as a result of the delayed fall of the relay H , so that the signal buzzer for a certain period of time even after the message from subscriber station N has been reported

l-S remains in effect.

The message from subscriber station N closes a circuit for relays Ä and B in the line selector in the following way: Earth, battery, relay Ά, con-

zo clock q ₂ , position io of the control switch, contact t ₂ , speech wire α of the subscriber line, contacts c ₂ , a ₂ , choke coil Dr, contact V ₁ , speech wire b of the subscriber line, contact t ₂ , position io of the control switch, contact g ₂ , Relay B, earth. The relay Ä interrupts the circuit for the relay O at its contact a \ , which by closing its contact O ₁ places earth on the V wire of the connecting line and thereby extinguishes a monitoring signal in the corded circuit of the remote officer. The remote officer recognizes that the called subscriber has reported.

After the end of the conversation, the release of the line selector is prepared by de-energizing relay E , which by relocating its contact ^ ₁ now creates an effective circuit for relay H ' : earth, battery, winding

+ o lung III of relay K, contacts e ₃ , k ₃ , branch point x, contacts e _lt O ₁ , g ₃ , relay H ', contact -W ₂ , earth. The relay H ' interrupts at its contact h \ the holding circuit for the relay G, which in turn opens the circuit for the relay C by opening its contact g _3. The resulting transfer of contact C ₁ causes the relays / and T to drop, whereby the release magnet M is switched on as follows: earth, contacts b _s , i ₄ , C ₂ , position io of the control switch, release magnet M, battery, earth. After triggering the line selector xind closure of the head contact k , the control switch is switched to position ii by energizing the relay F via: earth, contacts &", t _s , c ' _s , position io of the control switch, contact k, relay F, Resistance Wi ₁ battery, earth. The control switch goes to position Ii and from here to position 12, since the relay F is at the same time re-energized ^{via the e} ° interrupter UN. In position 12, a circuit for relay F is immediately established again via contacts bi, t ₆ , C ₄ , position 12 of the control switch, so that the control switch is moved into position 13. From this, as a result of the immediately occurring excitation of the relay F, it comes from earth via contact α ' _Ί , position 13 of the control switch to position 14, in which the relay F immediately again via contacts C ₅ and p _s and position 14 of the control switch is energized. The control switch goes into its rest position i. The line selector is in its rest position. ⁷ ^

The further switching processes, triggering of the group selector and the other switching devices take place in a known manner, so that it is not necessary to go into this.

Claims (4)

Patent claims: 1. Circuit arrangement for telephone systems with connection points of different class affiliation connected to a common exchange, in which the exchange the type of the called connection point is displayed, characterized in that the connection of the device for identifying the connection point is so under the influence of the exchange to call the Connection point provided switching means (switch T) is that their disconnection ^ delayed after notification of the called connection point (acceptance of the microtelephone) takes place. 2. Circuit arrangement according to claim i, characterized in that the ^Io ° sent by the switching center ringing current brings the device for identifying the type of connection point into effect. 3. Circuit arrangement according to claim i, characterized in that the switching means which delay the switching off of the signaling device (signal buzzer ) are formed by a thermal relay (relay Th). > i ° 4. Circuit arrangement according to claim i, characterized in that assigns a marking device to each line leading to a connection point to be specially marked is. For this purpose ι sheet of drawings