ARRANGEMENT OF CIRCUITS FOR THE CAPTURE OR IDENTIFICATION OF CONNECTIONS IN TEMPORAL MULTIPLEXING TELEPHONE INSTALLATIONS, OVERALL IN TELEPHONE INSTALLATIONS WITH A SELECTIVE RECEIVER CONNECTED TO A MULTIPLICITY OF SELECTION OF CONNECTIONS OF CYTOSISES OF CONNECTIONS AND CONNECTIONS OF KEYS

摘要

Circuit arrangement for tracing or identifying connections in digital time division multiplex telecommunications systems, in particular telephone systems, with a dialling receiver which can be connected to a plurality of subscriber connection circuits for audio-frequency code dialling signals, in particular push-button dialling signals. A push-button dialling receiver (CR) can be switched over to an operating mode as a call trace dialling receiver in which it is assigned to a calling subscriber with tracing authorisation and responds to call trace dialling signals only. A speech protection circuit which is effective in normal operation is initially disabled. IMAGE