Patent ID: 6411600
Filing Date: 2002-06-25
Classification: H04L

Abstract:
An asynchronous transfer mode (ATM) protection triggering method using a received alarm indication signal (AIS) flag for determining a failure generation location in an ATM network wherein protected domains are sequentially set or nested, said ATM protection triggering method comprising the steps of:(a) initializing as â€œ0â€  the received-AIS flag at source points of each of a plurality of protected domains; (b) detecting a failure at a first node, generating an end-to-end AIS cell at the first node and transmitting the end-to-end AIS cell to a second node downstream from the first node; (c) performing a received-AIS flag processing at the source point of one of the plural protected domains in which the first node is located; (d) performing an end-to-end AIS cell processing at a sink point of one of the plural protected domains in which the second node is located and sending an AIS cell receiving report to the source point performing the received-AIS flag processing; and (e) operating a protection switch when the source point performing the received-AIS flag processing receives the AIS cell receiving report.