COMMUNICATION CONTROL SYSTEM

摘要

PURPOSE:To enable an interchange of information between a terminal and switchboard without releasing call by controlling communication between terminals by circuit switching by using a specific pattern of one state bit (S bit). CONSTITUTION:An S-bit enveloped signal on a subscriber's line is inputted to specific-pattern detection part 4. Pattern detection part 4, once detecting a specific pattern, makes transmitted-signal switching part 5 send a signal from signal transmission part 11 to S-bit insertion part 10 and the specific pattern is sent to output terminal 13 of the subscriber's line by being inserted among S bits of the envelope signal.