CONNECTION PROVISION FOR REMOTE SIGNALING TELEPHONE SWITCHES, ESPECIALLY AUTOMATIC TELEPHONY SWITCHES - MULTIPLEX TIME - PCM, WITH A CENTRAL COUPLING FIELD AND WITH PARTIAL AND CENTRAL COUPLING FIELDS CONNECTED TO THESE

摘要

Line trunk groups connected to the doubled centralised switching network via correspondingly two time-division multiplex lines each and exhibiting, among other things, one switching stage each and one group processor each, are allocated to one another in pairs. The connecting devices and the PCM lines leading to the centralised switching network which are individually allocated to one and the other of two line trunk groups and which, in normal operation, are connected to the switching stage of in each case their own line trunk group, can be switched to the switching stage of the other line trunk group in each case in emergency operation of one of the two line trunk groups. So that no connections already switched through up to the point of switching-over, which extend via the connecting devices of the line trunk group in each case affected by the switching-over, are interrupted, each decentralised processor already transmits all connection data of connected-through connections to its partner processor in normal operation, on the basis of which data the relevant connections are prophylactically switched through within the switching stage and the respective partner line trunk group. …IMAGE…