DE856630C - Circuit arrangement for telecommunication systems with connecting lines sealed off by transmitters for mutual traffic - Google Patents

Description

Circuit arrangement for telecommunications systems with sealed off by transformers Connection lines for reciprocal traffic In telecommunication systems with connection lines, which are set up for mutual traffic, it causes difficulties, to block traffic in one direction, provided that the connection facilities at other end of the line are not OK; this is e.g. B. the case during the resetting of the voters following a connection, if one melts Securing, removing a relay set, etc. Used for blocking and during the Duration of the blocking state alternating current sent over the connecting line, then this prevents any traffic over the line. A traffic in the free direction is made possible if only to identify the beginning and a rush current is transmitted at the end of the blocking state, during the blocking state so no electricity flows. This is the case with connection lines that only run in one direction of traffic can be claimed without any particular difficulty. But there the occupancy the transmission device at the incoming end of a connection line as well is initiated by a current surge, which depends on the design of the telecommunications system is transmitted as a special pre-pulse, or the first burst of a series of elective bursts represents difficulties arise in connection lines for reciprocal traffic on. If a current surge occurs, it has not yet been decided whether or not this is the pre-impulse or the first elective surge of one to be built up link or the initiation of a blocking state. In any case, the received current surge at the incoming end of the connection line the following Connection facility occupied. At the same time, however, the connection line is also used blocked for outgoing traffic.

The assignment of the following connection device is only to be maintained when an incoming connection is actually established. If only one traffic direction is blocked, then the occupancy of the subsequent connection device to be canceled again to the traffic in the incoming direction.

The invention solves these difficulties in that the transmission device for the incoming traffic switching means are assigned, which are indicated by a short Power surge caused occupancy status in a local, only outgoing traffic transfer obstructive blocking state, if not within a certain time further power surges occur.

An embodiment of the invention is shown in the drawings. It shows Fig. I the transmission device Üg for outgoing traffic, Fig.2 the Transmission facility Uk for incoming traffic at the same end of a connecting line.

The following description focuses on the explanation of all Processes dispensed with which are irrelevant to the knowledge of the essence of the invention are.

Is from the opposite side, not shown, completely with the ones shown Transmission equipment matches, a power surge on the connection line VZ received, it is not initially possible to tell whether it is the initiation of a blocking state or should indicate the occupancy by a connection. This assignment takes place in the example by the first election surge.

The relay 2 J of the transmission device Ck (Fig. 2) is excited by the incoming current surge and switches on the relay 2 H with its contact 2 ii. Through the contact 2 h 6, the relay 2 D is excited via the contact 2 e 4, which closes a holding circuit with its contact 2 d 7 and with its contact 2 di cancels the short circuit of the upstream relay 2 E, so that it also responds . Relay 2 D is now short-circuited via contact 2 h 6 and contact 2 e 4. However, the dropout delay it receives from this short circuit is so great that it cannot drop out for the duration of the incoming current surge and remains energized after the current surge has ended. The subsequent connection device is now occupied by the contact 2 d 4 via the line ci.

Through the contact 2 hi (Fig. 2), the relay i U is energized via line 6 in the transmission device Üg (Fig. I), which with its contact iu 4 prevents the connection line from being occupied for outgoing traffic. In the transmission device Ük, the relay 2 T is brought via the contacts 2 h 4 and 2 e 6 and, after relay 2 H has dropped out, the relay 2 P is brought via the contacts 2 d 2, 2 h 2 and 2 x 4. At the same time, the thermal relay 2 Th is switched on via the contacts 2 d 8 and 2 x 6 , but it only becomes effective after 20 seconds, for example.

The relay i U of the transmission Üg (Fig. I), which was excited by the contact 2 hi, remains switched on after relay 2 H has dropped out and after relay 2 P has responded via contact 2 p 5. The relay i U has so much drop-out delay that it does not drop out in the time between the opening of the contact 2 hi and the closing of the contact 2 p 5. If the received power surge is used to occupy the connection devices by an incoming connection, then it is followed by further power surges. As soon as relay 2 H responds again when a second current surge is received, relay 2 X is brought via contacts 2 d 2, 2 h 2, 2 x 3 and 2 p 4 , which binds with its contact 2 x 4 and with its contact 2 x 6 switches off the thermal relay 2 Th and thus makes it ineffective. This second current surge can immediately follow the first one that initiated the occupancy in the same series of elective current surges. If the first series of impulses consists only of a single current impulse, the relay 2 X is triggered by the first impulse of the second series of impulses if this occurs within the warm-up time of the thermal relay 2 Th.

However, if the received rush current is to initiate a blocking period, it will not be followed by any further rushes. Therefore, the relay 2 Th is not switched off, but becomes effective after a certain time, for example 60 seconds, and short-circuits the relay 2 D with its contact 2 th via the contacts 2 d 3 and 2 e 4. Relay 2 D drops out, interrupts its holding circuit with contact 2 d 7 and removes the short circuit of windings II of relays 2 X and 2 P with contact 2 d 3. Relay 2 X responds in the circuit via contact 2 e 4. Contact 2 d 4 interrupts the occupancy circuit via the line ci for the subsequent connection device. Contact 2 d 8 switches off relay 2 T. Contact 2 x 6 interrupts the circuit of the thermal relay 2 Th. As soon as the contact 2 th is opened again due to the cooling of the relay 2 Th, the relay 2 E drops out; For the windings of the relays 2 X and 2 P, a holding circuit is now formed via the contact 2 e 3. The relay i U of the transmission device Üg (Fig. I) is kept energized via the contacts 2 x 2 and 2 p 5, thus preventing the connection line from being occupied by outgoing connections.

During the blocking period, the transmission facility Ük (Fig. z) the relays 2 X and 2 P and in the transmission device Üg (Fig. i) the relay i U excited. This prevents the transmission device Üg from being occupied and thus the connection line is blocked in the outgoing direction. From the other side However, the connection line can easily be assigned. The at such an incoming connection Operations are the same as already described for the case of occupancy, only with the difference that the relays 2? i and 2 P are already energized and thereby activation of the thermal relay 2 Th is prevented from the start.

At the end of the incoming connection it is if the blocking the connection line is to be maintained against outgoing connections, required to transmit a new blocking current surge through which the wanted Lock state is restored.

Claims (2)

PATE, CLAIM: i. Circuit arrangement for telecommunication systems with connecting lines for mutual traffic sealed off by transmitters, in which all processes are transmitted by current surges of a uniform type of current, characterized in that the transmission device (Ük) for the incoming traffic is assigned switching means (2 Th) which are associated with the short current surge change the occupancy state caused to a local blocking state that only hampers outgoing traffic, if further power surges do not follow within a predetermined time. 2. Circuit arrangement according to claim i, characterized in that a timing relay (2 Th) in the incoming transmission device (C `k) cancels the assignment of the downstream connection device while maintaining the blocking state.