A method of generating and releasing alarm cells in a medium to small-sized ATM switching system subscriber matching device

摘要

The present invention relates to an alarm cell generating and releasing method for quickly detecting and reporting a failure occurring in a small to medium type ATM (Asynchronous Transfer Mode) switching system subscriber matching apparatus. Currently, in ITU-T SG 13 I.610, (Alarm Indication Signal) OAM (Operation and Maintenance) cell and an RDI (Remote Defect Indication) OAM cell, which is an alarm cell, when a failure occurs in a layer, and informs another exchange (node) or a subscriber. However, since the actual implementation of the alarm function differs greatly depending on the system configuration and the type of the fault, the present invention reads the physical layer failure status information to check whether a failure has occurred according to the AIS_Trigger value, and, Generates AIS and RDI cells, which are alarm cells, periodically in units of one second during a failure period, and then changes the AIS_ trigger value, sets the RDI flag, reports a failure occurrence, and If the failure does not occur, the alarm cell is released, and the AIS_Trigger value is changed to report that the failure has been canceled.