Circuit arrangement for telecommunications switching systems, particularly telephone switching systems, with space division multiplex switching devices and junction circuits at their inputs

摘要

Circuit arrangement for telecommunications switching systems, particularly a telephone switching system, comprising space division multiplex switching devices (RT, R12, R3, R4) and junction circuits (V12, V3, V4); at the inputs of these, message information items are transmitted in PCM form but without time-division multiplex and signalling information items via space division multiplex switching device (RT, R12, R3, R4) with four-wire through-connection. One PCM word each is formed from a message PCM half word and a signalling information PCM half word. Signalling information PCM half words are received by the junction circuit (V12, V3, V4) and forwarded to an intermediate-level processor (S12, S3, S4) common to the junction circuits (V12, V3, V4) of a switching device (RT, R12, R3, R4) and are sent out again by the intermediate-level processor in each case via the junction circuit (V12, V3, V4). Message PCM half words are directly passed on via junction circuit (V12, V3, V4). The same technology is employed in the forward channel and the backward channel. IMAGE