FAULT DIAGNOSTIC SYSTEM FOR UPC CIRCUIT

摘要

PURPOSE:To provide the fault diagnostic synchronizing signal for a UPC circuit diagnosing properly a fault of the UPC circuit. CONSTITUTION:The fault diagnostic synchronizing signal for a UPC circuit controlling a cell flow based on specified information with respect to a cell traffic is provided with an active system UPC circuit W applying policing control to m-kinds of cells and a standby system UPC circuit P applying policing control to n-kinds of cells, decides policing by 2 systems or over with respect to one kind of cell or over and compares the result of decision to diagnose a fault of the UPC circuit. Furthermore, the traffic is measured by 2 systems or over with respect to one kind of cell or over and the fault of the UPC circuit is diagnosed by comparing the traffic measured values. Furthermore, q-sets of bridge memories storing prescribed information of the arrived cells in time series are provided and a fault of the bridge memory is diagnosed by comparing the content of the bridge memory by 2 systems or over.