SYNCHRONOUS SYSTEM FOR SUBSCRIBER'S TRANSMISSION SYSTEM

摘要

PURPOSE:To simplify the device constitution by sending a reference signal to a bus while being multiplexed in response to a load signal and using a clock of the synchronized reference signal to separate and receive an input multiplexing signal. CONSTITUTION:A reference signal is differentiated by using a clock E or 2E of a subscriber's controller 12 at the subscriber's controller side to generate a load signal, which is sent to a bus transmission line 17. A receiver 21 receives a signal of the line 17 in extension adaptors 191-193 for INS to generate reference signal clocks CK2-CK5 synchronized therewith and a control circuit 24 separates the signals into digital signals corresponding to extensions 181-183 for INS and an INS interface circuit 26 applies the separated signals to the extensions 181-183. On the other hand, the signals from the extensions 181-183 for INS are converted into a signals for the bus at a driver 24, sent to the line 17 and then sent to a trunk line.