Intermediate line circuit in PBX - switches circuit to other multiples reachable only from exchange translation system when all first multiples are engaged

摘要

A switching circuit may be used to control intermediate lines in a PBX. When one or all switching multiples are engaged, the circuit switches over the connection build-up to central switching circuits equipped with selectors or switching multiples for setting to a PBX extension. It gives connections to one or several switching multiples which can pref. be reached only in the direction towards the extension, and only from an exchange translation. The exchange translation systems and internal connecting circuits are connected to the switching multiples.