DE924220C - Circuit arrangement for telecommunication systems, in particular telephone systems, in which connections are counted depending on the direction of traffic either after termination of a connection or during the connection - Google Patents

Description

Circuit arrangement for telecommunications, in particular telephone systems, in which connections are counted either after the end of a connection or during the connection, depending on the direction of traffic to operate after termination of the connections, while with high-quality connections, in which the counters for each connection can be influenced several times by power surges, the meter operation is already carried out during the connection.

It is proposed to use a relay that transmits the counting current surges a call seeker after dialing the code, e.g. B. o, for a high quality connection to be switched by an auxiliary relay.

The invention shows a way to get around without switching in the call searcher the count according to the respective traffic direction, after completion or during a connection. It consists in the fact that the circuit of the Counter of a calling line closing relay of the call seeker that for excitation this relay required potential for low-order connections through a Relay affected when the calling subscriber gives the final signal and high-quality relay Connections from a contact identifying the selected traffic direction a subordinate voter level is created.

According to a further invention, this causes the counting circuit to close Relays also block the calling connection line against their use for a high quality connection. This remote locking is used with both high-quality (Remote) connections as well as for the time of counting after completion of a low-order (Local) connection carried out. This guarantees that the count a local connection is then carried out safely, if, at the moment of the count, a high-quality connection to the calling party Connection line is to be made.

In telephone systems is to achieve a perfect speech communication as perfect a symmetry of speech traffic as possible is required. This symmetry may also be given during the counting current impulse transmission via one of the speech cores connection are not disturbed. Even when applying the potential to the over a communication artery to be influenced by a relay indicating the direction of traffic Contact of the subordinate group voter becomes a practically sufficient symmetry of the speech path according to a further invention in each operating state of the connection path achieved in that between the two sides of the midpoint capacitor of the isolating transformer outgoing cores, in one of which the counting current impulses are received Relay is located, a capacitor is switched in the downstream group selector and that through the directional contact characterizing the initiation of a high-quality connection the same potential is applied to both wires.

In the embodiment shown in the drawing are only the switching means and circuits absolutely necessary to understand the invention shown.

The call searcher AS is set to a subscriber line. The relays P and T are energized in the blocking circuit: 1. +, IP, P II, Cas, T, Relay S is energized in the supply circuit. Contact has opened for 2s and contact has closed for 3s. Relay C is addressed: 2 . ..... C, 3s, 4, -.

The contacts 5 c, 6 c are open, 7 c is closed. C i, the occupancy relay of the downstream group selector GW, is energized: 3. +, 8 pa, 9 k, io, C i, -.

8 pa is the contact of a relay, not shown, which is switched on after the response of P and keeps the call seeker set during the connection.

In! Isolating transformer Ue, the subscriber-side windings pw i and pw: 2 are separated by the capacitor Ko i and the office-side windings sw i and 'sw2 by the midpoint capacitor Ko: 2. WI, W2, W3 are very high eared resistors for balancing purposes. A resistor W4 and the capacitor K04 are located in the wire a 'going out between sw i and Ko 2. The relay Z, which controls the counter circuit, is in the wire b ' going out between sw: 2 and Ko: 2. Between the two wires a' and b ', the capacitor KO 3, which only needs to have a small capacity, is placed in the group selector GW .

If the subscriber has established a low-order connection, the deko direction contact, which can be a decade contact of the group voter, is not closed. After the connection is terminated and the handset is hung up at the calling subscriber, relay S and then relay C drop out, which is short-circuited via contact 2s. Plus (earth) is c by the contact 5 applied to relay Z. The counting potential (minus) is at a subordinate point of the connection path on wire b. For example, it can be created in the group selector. Z speaks.

4. -2 zri II, b, 6 c, sw 2, Z, 5 C, the counter z is activated: 5. -, 12, 13 Z, zas, z, +.

At contact 14Z the winding I of the relay K is switched on, which switches its winding II into the circuit 3 by opening gk. Since the selector contact nk is closed, + is immediately applied to the switching arm cas 6. +, nk, 15 k, cas, T, -.

This direct connection of earth to the test wire of the subscriber line means that the subscriber line cannot be occupied by a high-quality (long-distance) connection during the time in which the counting of a terminated local connection is carried out, and the counting may be prevented. Since relay C has already dropped out, relay Z continues triggering the call seeker and the group dialer. The relay Z drops out. These details are not shown.

The subscriber has selected the long-distance traffic number o to establish a high-quality connection. The direction contact dek o is closed. Earth is applied to a 'and b' and is therefore always connected to the counter relay Z during the connection.

Because earth is also connected to a ', the symmetry an ' ch required for good telephone traffic is achieved in the case of high-quality connections.

During the connection, for example from the time the desired subscriber reports, the counting potential (minus) is temporarily applied in certain time segments. On every counting current surge: 7. -, zr, ii, b, 1 5 v, sw 2, Z, b ', dek o, + responds to relay Z and causes the counter to be operated. When Z responds for the first time, relay K is also switched on, which is placed in the holding circuit via Rela-is- C i.

The calling subscriber line is blocked by closing the circuit 6 for the duration of the connection against being occupied by another high-quality connection.

Claims (4)

PATENT CLAIMS: i. Circuit arrangement for telecommunications, in particular telephone systems with dialer operation, in which connections are counted depending on the traffic direction either after termination of the connection or during the connection, characterized in that a relay (Z) which closes the circuit of the counter (z) of the calling line of the call seeker (AS) the potential (+) required to excite this relay in the case of low-value (local) connections by a relay (C, 5c) influenced when the calling subscriber's final signal is given, and in the case of high-value (long-distance) connections, one of the selected traffic direction identifying contact (deco) is created on a subordinate voter level (GW). : 2. Circuit arrangement according to Claim i, characterized in that the relay (Z) closing the counting circuit causes the calling connection line to be blocked against occupancy by a high-quality connection (K, 15 k). 3. Circuit arrangement according to claim 2, characterized in that an auxiliary relay (K) which is switched on when the relay (Z) responds for the first time is placed in a holding circuit running via the occupancy wire (io) to the downstream connecting device (GW), in the case of low-order connections during the counting process and in the case of high-quality connections during their duration, the calling connection line blocks against occupancy by a high-quality connection. 4. Circuit arrangement according to claim i, characterized in that between the two sides of the midpoint capacitor (Ko 2) of the isolating transformer (Ue) outgoing wires (a ', V), in one of which (b') the relay (Z ), a capacitor (KO 3) is connected in the downstream group selector (GW) and that the same potential (+, earth) is applied to both wires (d, b) through the directional contact (dek o), which characterizes the initiation of a high-quality connection .