SYNCHRONISM CONTROL SYSTEM FOR TIME-DIVISION MULTIPLEX CIRCUIT

摘要

PURPOSE:To back up successively the synchronism control system when a main synchronism control is at fault and to prevent the system from being shut down by providing subordinate synchronism controllers which monitor a synchronizing signal on a time-division multiplex circuit while giving priority stepwise to the controllers. CONSTITUTION:A main synchronism controller 100a sends the synchronizing signal SYN to the time-division multiple circuit 3 and stations S1-Sn are assigned the right to use the time-division multiplex circuit 3. The subordinate synchronism controllers 100b-100n detect a synchronizing signal SYN sent out of the main synchronism controller 100a of subordinate synchronism controller with higher priority through a detector 200, and generates and sends a synchronizing signal SYN to the time-division multiplex circuit 3 from a synchronizing signal generator 7 when detecting the absence of the synchronizing signal SYN from a time-up state. Each subordinate synchronizing signal controller is given its priority in the form of a time-up time.