DE2514327B2 - Circuit arrangement for a subscriber connection in a centrally controlled teletype dialing exchange - Google Patents

Description

The invention relates to a circuit arrangement for a subscriber line circuit in telegraph dialing exchanges with a multi-level route network arranged between the subscriber line circuit and the transmission on the exchange side and with a central controller that handles all the processes required to establish a connection will.

In new telex switching systems, the connection is set up with the help of a central one Control that handles all related processes. For connecting through between the subscriber lines and the exchange-side transmissions is a route network, for example a three-stage switching network, via which the terminated with the subscriber line circuits Subscriber lines connected to the transmissions under the control of the central control unit will. The evaluation of a call criterion sent by a subscriber for an outgoing one Connection, the criteria sent by the transmissions for an incoming connection and the The search for the route and the setting of the through-connection routes in the route heating plant is carried out by the central Control taken over. A telex switching system constructed according to these principles is for example in the Siemens magazine, 1968, issue 6, pages 443 to 465.

Subscriber line circuits in teletype dialing exchanges essentially have the task of connecting the terminals via the subscriber lines to connect with the facilities in the office, thereby recognizing calls and the circuits via the To switch through the route network for the transmission. This also includes incorrect assignments caused by faults have arisen on the connection line, and there must continue to be connections whose Terminal devices or their connection lines are not functional, recognized and signaled as malfunctioning will. These requirements require a considerable effort for the subscriber line circuit, the is particularly disadvantageous because subscriber line circuits can not be centralized, but each must be assigned to a subscriber line.

The invention is based on the object of specifying a subscriber line circuit which is circuit-wise can be combined to form a larger assembly and with it also the fault conditions can be recognized and signaled.

The invention is characterized in that the call evaluating switching means is in the subscriber line circuit is a bistable relay that is activated by reloading a capacitor when the occupancy is outgoing over the subscriber line and at

Incoming occupancy via the contact of a coupling relay of the road network can be switched over from the official transmission via a control wire of the road network plant, that the coupling relays and the coupling contacts of the first coupling stage of the road network plant are arranged in the subscriber connection circuit, that the receiving wire (b- Adev) coupling contacts connecting the subscriber line are designed as sequential switchover contacts and that when the coupling contacts are not actuated, they establish a connection between a blocking wire of the route network and the receiving line; ·, 'fr wire) of the subscriber line.

The control of the bistable relay via a capacitor connected in series with it brings the This has the advantage that power consumption occurs only briefly when there is a change in state.

The bistable behavior of the relay arranged in the subscriber circuit allows it, in addition to the Recognition of call criteria on the subscriber line also disturbances on the subscriber line and to carry out disturbances of the end devices in a centralized manner and via a wire of the road network to report from the office-side transmission to the subscriber line circuit. By using a coupling relay with a sequential changeover contact in the first stage of the route network is without additional effort possible, the subscriber line in the event of a failure automatically on the To check re-entry of the operational idle state.

Further features of the invention and its further developments emerge from the subclaims.

Details of the invention are explained below with reference to the drawing.

There a subscriber line circuit TA is shown, to which the transmit wire a and the receive wire b of the subscriber line TL are connected on the left. In the lower part of the drawing, the central control ZS is indicated, with which the subscriber line is connected via the control inputs RZ and RE for call signaling. Further control inputs BSV, STC, BST and BSZ are used to signal malfunctions. Via the control output TE , the central controller ZS provides a marking criterion which, as will be described later, triggers the functions necessary for establishing and clearing connections in the subscriber line circuit TA. In the upper part of the drawing, the route network WNW is indicated, via which the connection to the transmission on the exchange side is switched through.

The subscriber line circuit TA contains, as a call-evaluating switching means, the bistable relay R with a capacitor C connected in series with it. The first and second control relays F and T and coupling relays are also provided. The subscriber line circuit constructed according to the invention is designed in such a way that several subscriber line circuits can be combined to form a circuit unit forming a subscriber line circuit group. The exemplary embodiment assumes that five such subscriber line circuits are combined to form such a subscriber line circuit group. For this reason, the subscriber circuit contains five coupling relays K 1 to K 5 with a corresponding number of outputs to the road network WNW and this

corresponding multiple outputs to the control inputs BSV, STC, BST, BSZ of the central control ZS. The monitoring processes to be carried out in the central controller ZS for each subscriber line circuit group can thus be centralized

In the following, the individual phases in the construction and dismantling of a Connection described, with further details of the circuit arrangement explained at the same time will.

Outgoing connection establishment

When an outgoing connection is set up, a start- polar criterion is sent over the a-wire of the subscriber connection line TL , which causes a reversal of the capacitor C connected in series with the bistable relay R and thus a switchover of the bistable relay R. The call criterion is reported to the central control ZS via the control inputs RZ and RE via the now activated contact r 1. There, in a manner not shown here, a free official transmission is sought and occupied. At the same time, the relevant inputs and outputs of the WNW route network are also marked. In a manner also not shown here, a free route is sought via the route network WNW and the marking criterion is output via the control output TE of the central controller ZS. This marking criterion brings the control relay F over its winding FI (TE, Fl, Vielfa.chanschluss M) and one of the coupling relays K 1 to K 5, z. B. the coupling relay K 1 via its winding KiI to respond. When the coupling relay K 1 is excited, its contacts k 11 to k 14 are actuated. K via the contact 14 and the control relay Tuber is now turned on its winding TI, so that both wires of the subscriber line TL via the contacts (X and 1 1 of the two control relays F and T are switched to the inputs of the directional network NW. The call criterion has now been The subscriber connection circuit TA in the central controller ZS is marked as busy via the contacts / 2 and r2 and the control inputs ßST and BSZ and after the connection has been established, the messages are sent or received to the desired subscriber.The state described remains in place until the connection is terminated.

Incoming connection establishment

When an incoming connection is set up, the bistable relay R is switched over, in contrast to the setting up of the connection in the outgoing direction via one of the wires in the WNW route network using a criterion that is sent out by the transmission on the office side. On the basis of the dialing information received in the transmission on the exchange side, the central control ZS determines the subscriber connection circuit TA corresponding to it in a manner not shown here and outputs the marking criterion via the control output TE d * s. In order to be in the subscriber line circuit TA turn the control relay Fund one of the coupling relays K 1 to K 5, z. B. the coupling relay K 5 via its winding K 51 is excited. The control relay Tuber is via the contact k54

Winding 77 switched on. The a and 6 wires of the subscriber line TL are now through-connected via the contacts k 51 to k 53 to the relevant transmission at the office. In this case, however, the bistable relay R is still in its previous state, and a switchover only takes place after the recognition and evaluation of the call confirmation criterion transmitted by the called subscriber station via the connected lines for transmission on the exchange side. If this has arrived in the transmission, the polarity is reversed via a switching wire of the route network WNW and via the coupling contact k 52 in the subscriber connection circuit TA , so that the capacitor Cin reverses the charge in the other direction and the bistable relay R is switched over. When this status is reached, the connection to the called subscriber is established.

Capture and fault conditions

The bistable mode of operation of the relay R makes it possible to recognize both the capture status and the fault status of the subscriber line TL or the terminal and to signal this to the central control ZS. For this purpose, the bistable relay R has a second contact rl, which is designed as a sequence switching contact and in its first position forms a holding circuit only for the control relay T and in its second position, which is assumed after a switchover, also a holding circuit for the control relay F.

A catch status may have to be signaled after a properly established incoming or outgoing occupancy has been triggered. In both cases, the holding circuit for the winding KiJI to K 511 of the coupling relay K 1 to K 5, which is switched on during the connection, is disconnected, so that it drops out and thus also causes the control relay T in the subscriber line circuit TA to drop out. Until the connection is completely terminated, which is known to be characterized by polarity reversal of the subscriber line in the subscriber station, the bistable relay R remains in its last position, and thus holds the control relay F via its winding via its contact rl and contact / 3 FII still excited. The evaluation of the polarity reversal in the subscriber station with the aid of the bistable relay R thus makes it possible to monitor the subscriber station and the subscriber line to determine whether the connection release is correctly acknowledged there. If this is not the case, the bistable relay R and the control relay F remain energized while the control relay T is switched off. In this case, the central control ZS has a criterion available at the control inputs BST and STG which it can evaluate to detect the above-mentioned state. At the same time, since the contact / 4 of the control relay F is actuated, the forwarding of a call criterion to the central control ZS is automatically prevented.

The automatic release of the catching state is recognized by the switching of the bistable relay R , which is constantly connected to the a-wire of the subscriber line TL via the still-activated contact f \ of the control relay F with the a-wire of the subscriber line TL during the catching state. The termination of the catching state automatically leads to the operational idle state and the switching off of the criterion signaling the catching state at the control inputs STC and BST of the central control ZS.

In addition to the signaling of the capture state, the invention also allows the signaling of a Disturbance on the subscriber line or in the subscriber station.

As already mentioned, the transmission on the exchange side sends a polarity switching the bistable relay R with an incoming connection only when the call confirmation from the called subscriber arrives there. However, this will always not occur if either the subscriber station itself or the subscriber line TL is disturbed. In this case the control relay Γ and the relevant coupling relay K 1 to K 5, for example the coupling relay KS, are excited. If the call confirmation criterion does not arrive in the official transmission within a predetermined time, the holding wire in which the winding K 511 of the coupling relay K 5 is located is disconnected and the coupling contacts k 51 to k 54 return to their original position.

In this case, however, there is now a holding circuit for the winding TII of the control relay T via the contact rl of the relay R which is in the original position and via the contact 1 4 of the control relay T.

Likewise, however, the control relay F is still in the switched-on state via its contact / 3 and its winding FII. According to the invention, the coupling contact k 13 to k 53 connecting the path network WNW to the receiving wire, that is to say mi the i »wires of the subscriber line TL , is designed as a sequential switchover contact. For the case considered here, there is thus a connection via the contact k 53 from the b-wire of the subscriber line TL via the route network WNW to a blocking symbol generator. A blocking signal is switched on via the wire SPZ and the contacts k 53 to k 13 to the 6-wire of the subscriber line TL until the subscriber line or the terminal responds to the blocking signal by changing the polarity on the a-wire of the subscriber line. Only then is the bistable relay R switched over and, with its contact rl, interrupts the hold circuit for the control relay: T, which then drops out and with its contact ti switches off the blocking signal. In a manner not shown here, the polarity is then changed again in the subscriber station, as a result of which the bistable relay R is switched off and the operational idle state is now restored in the subscriber line circuit TA. The central control ZS is not loaded during these processes. Only one signaling criterion is available here at the control input 57TG, which can be evaluated in the central controller Zi as a criterion for the occurrence of a fault.

eo With every signaling of a certain state, for example the catching state, the fault state etc., an optical or acoustic display can be coupled within the scope of the invention.

1 sheet of drawings

Claims (4)

Patent claims: 1. Circuit arrangement for a subscriber line circuit in teleprinter dialing exchanges with a multi-level route network arranged between the subscriber line circuit and the office-side transmission and with a central control via which all the processes required for establishing a connection are handled, characterized in that the call evaluating switching means in the subscriber line circuit (TA) is a bistable relay (R) , which is activated by recharging a capacitor (C) with outgoing occupancy via the subscriber connection line (a-wire) and with incoming occupancy via the contact (k 12 ... k 52) of a coupling relay (K 1 .. . K 5) can be switched over from the office-side transmission via a control wire of the road network (WNW) that the coupling relays (Ki .. K 5) and the coupling contacts (k 11 to k 14 ... k5 \ to * 54) of the first Coupling stage of the road network (WNW) are arranged in the subscriber connection circuit (TA) that the receiving wire fö wire) of the subscriber line with the cores of the road network (WNW) connecting coupling contacts (k 13 to k 53) are designed as sequential switching contacts and that this connection between a blocking wire (SPZ) of the road network (WNW) and the receiving wire (b-wire) when the coupling contacts are not activated the subscriber line (TL) . 2. A circuit arrangement according to claim 1, characterized in that the bistable relay (R) has a first contact (r 1) via which the call criterion signaled to the subscriber line (TL) by a change in polarity on the transmission line fa wire) of the subscriber line (TL) when the occupancy is outgoing the central control (ZS) is sent that, after a route search process in the route network (WNW), an excitation circuit for a first control relay (F) and a coupling relay (K 1 to K 5) is formed via a control output (TE) of the central control (ZS) is that over the contacts (ktt to k 13 ... k 51 to k 53) of a switching relay, the write and switching wires of the directional network (NW) are turned on and over a further contact (k \ 4 to Ar 54) a second control relay (T ) is switched on and that via first contacts / 1, 1 1) of the first and second control relays (F, T) the subscriber line (TL) is switched through and an occupancy criterion is sent to the central controller via second contacts (f2,12) (ZS) is sent. 3. Circuit arrangement according to one of claims 1 or 2, characterized in that with incoming occupancy a bistable relay (R) switching polarity change on the switching wire of the route network (WNW) in the official transmission only after receiving and evaluating the sent out by the called subscriber station Call confirmation criterion is sent. 4. Circuit arrangement according to one of claims 1 to 3, characterized in that the bistable relay (R) has a second contact (r2) via which, after the bistable relay (R) is switched, a hold circuit for the first control relay (F) via the latter second winding (FH) and after a further switchover of the bistable relay (R) there is a hold circuit for the second control relay (T) via its second winding (TII) , and that for detecting the catching state and for detecting faults on the subscriber line or in of the subscriber station the hold circuit is connected to a control input (STG) of the central controller (ZS)