Circuit arrangement for a special telephone system formed from a centrally controlled extension part and a centrally controlled operating part (transfer connection device)

摘要

For the extension subscriber devices (NST) and the operating subscriber devices (BST), the special telephone system (FSA) has subscriber-assigned switching sub-stages for the extension part (TK-N) and for the operating part (TK-B). The extension part is connected to the operating part of the special telephone system (FSA) via the transfer connection device (UAE) in which the branch lines (AZL) can be manually disconnected by the operator on the switchboard equipment (VPE). Both sub-systems - the extension part and the operating part - are controlled by the common central control device (ZST). Special telephone systems of this type are required, inter alia, for power supply companies. IMAGE