schaltungsanordnung for zentralgesteuerte time multiplex - fernmeldevermittlungsanlagen, in particular pcm fernsprechvermittlungsanlagen, with a koppelfeld, anschlusseinrichtungen and with a central steuerwerk and anschlussgruppen assigned decentralized control devices.

摘要

1. A circuit arrangement for centrally controlled t.d.m. telecommunications exchange systems, in particular PCM telephone exchange systems, with a multi-stage switching network (K) which has t.d.m. inputs and t.d.m. outputs, and with a plurality of peripheral devices (LTG1, LTG2 ... LTGn) which serve to connect t.d.m. connection lines, analogue connection lines and/or analogue subscriber lines (e.g. T1), and each of which is connected to a t.d.m. input (A1) and a t.d.m. output (A2) of the switching network (K), and with at least one central control unit (ZW) and a plurality of decentral control devices (GP, GP2 ... GPn) which are individually assigned to the peripheral devices (LTG1, LTG2 ... LTGn) and which are connected to the control unit (ZW) via data channels (via e.g. LTG1, K, m, MB, D), and with devices which serve to transmit switching characteristics which are to be forwarded via analogue connection lines (Vx), in particular charge metering pulses, which are transmitted as d.c. signals via current paths which are switched through for a connection simultaneously to and in the same way as the communications paths, e.g. speech circuits, and which, in the case of connections of the decentral control device (GP, GP2 ... GPn) which each extend via an analogue connection line (Vx), are fed to that peripheral group (LTG1, LTG2 ... LTGn) which is assigned the subscriber line (T1) or connection line which is connected to this analogue connection line (Vx) via the switching network (K), characterised in that in the establishment of connections from a subscriber line (e.g. T1) - or connection line - via the switching network (K) and in each case via an analogue connection line (Vx) and via a connection-individual switching device assigned thereto, e.g. a line terminating circuit (Vz), in addition to a first t.d.m. connection path through the switching network (K) between the subscriber line (e.g. T1) - or connection line - and the connection-individual switching device (Vz), which connection path serves as communication transmission path via the switching network (K), independently thereof and in addition thereto, from the decentral control device (GP, GP2 ... GPn) of that peripheral group (LTG1, LTG2 ... LTGn) which is assigned the relevant subscriber line (e.g. T1) - or connection line, to the same connection-individual switching device (Vx) a second t.d.m. connection path is switched through via the switching network (K) and this second t.d.m. connection path serves for the transmission of the switching characteristics.