A process for the development of functional sequences in a centrally controlled telephone switching system, in particular in a centrally controlled private branch exchange, consisting of a plurality of groups of connection units, each with a central, similar, automatic and also adequately controlling the operation of the cooperating control mechanisms.

摘要

To form bigger telephone systems, two or more small exchange systems (System A, System B, System C) are connected together into a single system. For this purpose, the coupling networks (KVA, KVB) of the exchange systems System A, System B, System C) to be connected together are connected in such a way that the respectively free two-core terminals of the coupling networks (KVA, KVB) are directly connected together. IMAGE