Circuit arrangement for a telecommunication installation, in particular a telephone private branch exchange, having subscriber and line transmission groups and interface modules

摘要

Subscriber and/or line groups are in each case assigned a common interface module, which is in connection both with the speech-path switching network and, via a bundle of data transmission lines, with a central control unit, provided for establishing connecting paths. The information is transmitted by the pulse code modulation method via the speech-path switching network. For central control of the telephone exchange, the information is transmitted via a bundle of data transmission lines (DL) in a communication format of variable data length (HDLC procedure). Each interface module is assigned an interface circuit for sending and receiving information of the connected subscriber lines and/or connecting line transmissions and for intermediately storing voice and signal information and state monitoring. A transmission of the voice and signal information is performed in dependence on control commands of the central control unit and in dependence on a peripheral control unit assigned to the interface module. A sending and receiving device (HDP), assigned to this module, permits not only the transmission of information in a communication format of variable data length via the data line transmission to the central control unit, but also a conversion of this information into ... suitable for the transmission of information via the speech-path switching network ... Original abstract incomplete. <IMAGE>