APPARATUS OF SIGNAL TER-MINAL GROUP

摘要

signal terminals for exclusively performing a level 2 signal linking function of a common line signal type protocol; a signal terminal master for carrying out functions such as detection of disorders, maintenance and the like for a signal terminal group; and a signal terminal bus for enabling communications between signal terminal network nodes and the signal terminals and the signal terminal master. The signal terminal bus includes: a data transferring bus group for enabling serial communications between the signal terminal network and the signal terminals and the signal terminal group; and a maintenance signal group for performing maintenance on the signal terminal group.