DE701225C - Circuit for starting call seekers - Google Patents

Description

Circuit for Starting Call Seekers The invention relates to a circuit for starting call seekers with one at the end of the starting chain lying switching means that has the task of triggering any signals when all call seekers are busy. The invention now aims to be that of a call seeker or switching devices jointly assigned to a connection path, especially ncg @ ere to simplify the starting devices to a large extent. In the known arrangements was activated by a contact of the switching means at the end of the chain when it was busy all call seekers send a special busy signal stream source to the subscriber line switched on, or switching means were put into operation at the end of the chain, which itself is an interrupter game serving to generate a busy signal. have it carried out.

According to the invention, this arrangement is significantly simplified by da.ß at the end of the chain a differential or step winding of the starting relay like this is arranged that the starting relay when the differential or step winding is excited even works as a buzzer relay. In this way, the arrangement or is unnecessary Use of special signaling devices to generate a busy signal for the caller when all connection paths are busy. Namely one stands for other purposes already existing signal generating device are not available, Thus the invention is effective in saving a special signal generating device to indicate that all call seekers are busy. On the other hand, there is a signal generating device available, so - the advantage of the invention is that for the mentioned Different facilities are used for both purposes, i.e. different in both cases Characters can be sent; the subscriber therefore receives when it is busy all call seekers (all connection routes) have a different signal than when the line is busy of an already selected, desired participant.

The switching means located at the end of the starting chain are in accordance with further Invention arranged so that they can be used together with the starting relay as a relay breaker work. The arrangement is particularly simple if at the end of the chain a Differential or step winding of the starter relay is so that the starter relay is included Excitation of the differential or step winding a self-breaker game begins. Such an arrangement is shown in the exemplary embodiment, which is now based on the figure should be explained in detail.

The upper part of the figure shows a connection path consisting of a call finder AS and a line selector LW. Below the dash-dotted line, the devices that are jointly assigned to a plurality of connection paths, namely the starting and signaling devices, are shown. The mode of operation of the circuit is as follows: When the handset is picked up at the intercom connected via the connecting line La, Lb, the following call circuit is established: z. ----, RT I, rtb "Subscriber loop, rtb3, RT 1I, an" -1 -.

In this circuit, the subscriber stage relay RT responds in the first stage and puts its contacts rta do. The test circuit for the call seeker AS is prepared at the contact rta "and the following circuit for the winding I of the common starting relay Ast is established at the contact rtal: 2. -, AstI, rtal, rtbl, +.

Relay Ast therefore relocates its contacts. With aste, the short circuit of branch III is canceled, with on, a circuit for the occupancy relay P, winding III of the first connection path is established. If the first connection path is occupied, either the contact wo, or va5 or both is unoccupied, so that the occupancy incentive is given to the P relay of the second or third connection path.

If all connection paths are occupied, the following circuit is established for winding II of the starter relay Ast : 3. -, A; 411, wo, or va5 of the third path, wo, or va; of the second way, where, or va, -, of the first way, aste, rtal, rtbl, -1 -.

The winding I and 1I of the starter relay Ast are connected differentially. Since the winding An I is still excited in the circuit -2, the AK relay drops out, so that the contact opens. This interrupts the excitation for the differential winding An II, so that the starting relay responds again via its first winding in the circuit: 2. As a result, the differential winding is re-energized, relay Ast drops out and so on.

It follows from the foregoing that the starter relay starts a self-breaker game when all the connection paths are busy. In this case, an alternating voltage is induced on the winding AnIII serving as a signal winding, so that the caller receives a signal to indicate that there is currently no free connection path available. The subscriber will then hang up the receiver, so that relay Ra ' drops out again and thus relay Ast finally drops out.

The normally closed contact on .., which short-circuits the third winding of the on relay, has the purpose of providing the starting relay with a pick-up delay. This pick-up delay prevents the starting relay from being temporarily energized when a line selector checks the relevant subscriber station in the incoming traffic. This would have to be feared in view of the fact that the step relay RT, when excited via the c-wire of the line selector, does not immediately pass through to the second, but temporarily only to the first stage, whereby the starting circuit would be closed for a short time. In order to avoid the unnecessary starting of a connection path anyway, the starting relay is equipped with a pick-up delay in the manner described.

It is now assumed that the first connection path is free when it is occupied, the contacts wo3 and va5 of this path are therefore at rest. Then the winding 111 of the test relay P of the line selector LW is excited, and this relay comes to respond. Relay P transfers its contacts, including the through contacts p4 and p, and its contact p5. At the contact p, the rotary magnet DAS of the call seeker is placed in a self- interrupting circuit: 4 .. -, DAS, (las, al, d- arm of the LUV "p5, - @ -. The call seeker starts up and moves his switch long until the calling subscriber line, identified by the contact rta, is found. When this position is reached, the winding 1I of the feed relay A serving as the test winding is excited in the following way: -, RT 1, rta. "c-arm of the AS , W% 3, a-arm of the LW in the zero position, p4, wol, A 1I, +.

Since this test circuit is via the switching contact p4 of the line selector and whose a arm is led, is a special contact of the P relay for closing of the call seeker test circuit saved in the occupancy.

In circuit 5, in addition to the A relay, the subscriber relay RT also responds in the second stage. With rtb2, rtb, the call windings are separated from the connection line and with rtbl the starting circuit is opened, so that the relays An and P come to waste. The A relay stops the call seeker by canceling the short circuit of the high-resistance delay relay VA at a1, so that the rotary magnet of the call seeker no longer receives enough current, but the relay VA does respond. With va., And va, the call finder switch arcs are switched through to the feeder relay A, so that this is now held by its two windings and the subscriber loop. With vag, the e, vein du'reh direct application of earth is blocked and with va75 the starter chain is switched through to the next connection path.

When the P relay drops out, the relay WZ of the signal set is energized in the following way: 6. -, WZ, e-arm of the LW, P3, vb2 ,. a2, signal winding AIII, +.

The WZ relay starts the buzzer SU at wzl, which works as a self-interrupter with the help of its differential winding II and its interrupter contact sacl. This induces an alternating voltage in the winding SU II and this voltage is transmitted via the capacitor G3 and various contacts of the relays X, Y, Z 'to the line WZ and thus to the signal winding A III, so that the calling subscriber receives a buzzer tone. The relay chain X, Y, Z left on at contact wz2 interrupts this buzzer tone in a certain rhythm at contacts x2,, s, x5, y3, z5. The subscriber therefore receives a periodically interrupted dialing signal.

You can now begin to send out the number current pulses. The feed relay A periodically drops out. With the first current impulse, the short circuit for the winding VB I is canceled at contact a, so that this relay responds in the following circuit: 7. -, DAS, das, al, VB I, Wil, vag, - @ . During the series of impulses, the winding VB I is periodically short-circuited again, but the relay VB cannot drop out. The VA relay also continues to operate during the series of current impulses.

The current surges reach the rotary solenoid DLW in the following way of the line selector -: -.

8. -, DLW, P1, vag; a "-The line selector therefore makes as many steps as there are current surges. The WZ relay is de-energized by the e-arm of the line selector and the transmission of the dialing signal is thereby terminated. A short-circuit for the winding occurs on the d-arm of the LW VBI prepared, unless the selector is steered into one of the two latching parts 9 or 9o by the first series of impulses. If this is not the case, after the VB relay has dropped out at the end of the series of impulses, the winding VBI cannot be restored are excited because this winding is now short-circuited via vbl and d-LW. If, on the other hand, the selector is controlled to one of the two latching parts, the VB relay drops again at the end of the series of impulses as a result of constant switching of contact a1 by short circuit However, it can be excited again under the effect of a new series of n_ _ current impulses, since the contacts c) and 90 in the d-bank are not multiplied with the other lamellas, that is, they are not connected to the contact vbl d. If, therefore, the selector is switched on from the latching point by a further series of current impulses, then the winding VB I can be re-energized during this further series of current impulses.

It is assumed that the voter has already been controlled under the influence of one, two or three series of impulses on a desired subscriber line; the VB relay drops out at the end of this series of impulses and prepares the test circuit for the test relay P at its contact vb5. However, this circuit can only be closed when contact x6 is thrown and contact y1 is at rest. These two contacts belong to the relay chain X, Y, Z, which in this case serves as a distributor arrangement and has the purpose of preventing several line selectors from simultaneously applying test potential, which could easily result in double testing. This is achieved by the fact that in the test circuit of the individual line selectors there are different contacts of the relays X, Y, Z, as can be seen from the drawing, the contacts x, and yl in the first connection path and y4, z1 in the second connection path and in the third connection path the contacts z2 and x1. The three test circuits can therefore never be closed at the same time.

In the present case, the relay chain is started by energizing the B relay in the following circuit: 9. -, B-, line Bes, af2, e-arm of the line selector on any contact except for the latching points PS, vb2, a2, AIII, -f -.

Relay B responds and energizes relay X at b2, whereby the chain begins to play. At the same time, the buzzer SU is left on at b1 and a buzzer tone is generated via the capacitor G4. and transmit the Bes line to the signal winding A III, so that the subscriber receives the busy signal, unless the test relay P responds and the signal winding A III at contact P3 from the busy line and switches over to the overhead line.

In the first case, the subscriber can either give up the connection by hanging up the receiver or wait until the desired line is free, since the test potential is switched on again after a certain time at contacts x and y1 and thus a new test attempt is made will. In the second case , the F-relay is energized via P2, line Frei, -rvg, and thereby the pole changer is started on contact f, so that ringing alternating voltage is applied to the ringing current line via f2. Furthermore, the buzzer is left on at f3 and the buzzer tone is transmitted via the capacitor C and the contact rv3 to the line Frei and thus to the signal winding A III. At f4 the hot wire relay Hi was also heated, which now starts a slow interrupter cycle with relay RV , so that the F relay is periodically de-energized at contact rv3 and the ringing current is periodically interrupted at the f contacts. In the same rhythm, the buzzer current is also interrupted at contact rv3, so that the subscriber recognizes that the desired point is free from the call rhythm of the buzzer.

The desired subscriber line is blocked via the contacts p5, val in a known way.

The ringing current runs in the following way: io. Earth at the pole changer, line, resistance Wi., P2, vbs, wave contact wo, of the line selector, p4, a-arm of the LIV, subscriber loop, b-arm of the LIV, pe, vb4, VB II, p1, DLIV, -.

If the called station answers, the VB relay in the circuit io is activated by closing the loop. This relay is now used as a Rufstromabschaltelais. By short-circuiting its other winding I via vbl and the d-arm of the LW, the VB relay is provided with a pull-in delay so that it cannot respond while the ringing current is being transmitted. At the contact vb @ the earth is finally separated from the signal lines and the F-relay is released so that pole changer and buzzer come to rest. At vb3 and vb4 the voice lines are switched through so that now both participants are connected to one another. Both receive their microphone feed from the common feed relay A. Relay VB continues in series with DAS and VA via its winding I, the short circuit of which is canceled by switching vbl.

The release takes place when after the end of the call both participants have hung up their receiver, by dropping the A relay, whereby the delay relay VA comes to drop out due to a short circuit. As a result, the blocking is canceled at the contacts va, and vag and the line selector is brought to the rest position via a3, vae, wo_, d-LW, p1. If the line selector has reached the rest position, the connection set is connected to contact ad. made verifiable anew. The relays P and V B have meanwhile also come to waste.

Preferred subscribers have the option of listening in on busy subscriber lines. The contacts of these preferred subscriber stations are connected to earth on the d-arm of the caller AS. If the line selector is set by such a subscriber to a busy line, the relay AF is activated in the following circuit: I I. -, DLW, p1, vae, Wi4, AF, vbe, --Arm des AS, +.

The d-arm of the LW prevents the AF relay from responding when the selector is set to one of its two locking collars, since in this case the relay AF is short-circuited via d-LW, cal and pa.

With afl and afg, the preferred subscriber is connected to the existing conversation via the two capacitors C1 and C2 so that he can overhear. At afs the relay chain X, Y, Z is started and the battery is periodically connected to the b-wire via the contacts z4 and af, via the resistor Wi5, whereby the speaking participants receive a ticker so that they can listen to the third participant be made aware.

Claims (3)

PATIENT TRANSPORTATION: i. Circuit for starting call seekers with one at the end of the event chain, when all call seekers are busy signals triggering switching means, characterized in that at the end of the chain a differential or step winding of the starter relay (An.) is so that the starter relay is energized the differential or step winding works as a buzzer relay. 2. Circuit arrangement according to claim i, characterized in that the starting winding and the differential or step winding of the starting relay (An) are connected in parallel. 3. Circuit arrangement according to claim i or 2, in particular in connection with a step relay in the Subscriber circuit, characterized in that the starting relay has a third, preferably serving as a signal winding has the winding of a normally closed contact (an2) of the Starting relay is short-circuited; so that the relay works with a delay.