COMMON SIGNALLING LINE SYSTEM OF ELECTRONIC SWITCHING

摘要

The system provides a common channel signal processing function between the exchanges, corresponding to CCITT No.7. The system comprises: message transfer signal processing unit (1); B- bus (6) for information exchanging between processors, interworking processing unit (2) to control ISDN subscriber and trunk line, and call process informations; CEPT trunk control unit (3) for selecting a specificinter exchanging channel; CEPT digital trunk unit (4) for interfacing between exchanges; line multiplexing unit (5) for multiplexing switching channels to provide level 3 module communication between signaling points.