Resynchronous control apparatus of subscriber communication machine, and resynchronizing method

摘要

A subscriber communication machine is provided with an off-synchronous detector detecting off-synchronization of communication with an office communication machine, a correlation processor correlatively processing received data received over a communication line and held data having been transmitted from the office communication machine when the off-synchronization is detected by the off-synchronous detector, and a resychronous controller specifying a synchronous timing by the correlation process in the correlation processor to establish resynchronization in the communication with the office communication machine. When subscriber communication machine cannot keep synchronization with a transmission cycle in a predetermined transmission system such as TCM or the like in steady communication, it is possible to promptly resume the communication without necessity for initializing all over again.