SYSTEM OF CIRCUITS FOR TELECOMMUNICATION CHANNEL INSTALLATIONS, ESPECIALLY TELEPHONE MULTIPLEX TELECOMMUNICATION INSTALLATIONS BY PCM TIME DIVISION, WITH A CENTRAL SWITCHING NETWORK AND WITH DECENTRALIZED PARTIAL SWITCHING LINES CONNECTED WITH THE SAME

摘要

Line trunk groups connected to the duplicated central 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 line circuit facilities which are individually allocated to one and the other of two line trunk groups and which are connected to the switching stage of in each case their own line trunk group via internal lines in normal operation, can be switched over to the switching stage of the other line trunk group in each case. So that no connections already switched through or being set up are interrupted up to the point of switch-over, all of the internal lines, which only form connection- individual communication paths for speech, data and the like, can be immediately switched over whereas of the individual associated connection-individual signalling channels only those belonging to unallocated internal lines and those carrying permanent connections can be switched over. …IMAGE…