Patent ID: 6680903
Filing Date: 2004-01-20
Classification: H04L

Abstract:
A network system in which plural nodes are connected by means of a transmission line, and a specific signal pattern is transmitted to the transmission line at regular time intervals within a fixed time period, whereineach of the plural nodes includes signal monitoring means for detecting existence/non-existence of a signal transmitted on the transmission line and detection means for detecting receiving of the specific signal pattern, the detection means detecting occurrence of a failure in the network system, and wherein each of the nodes which have detected occurrence of the failure, specifies a location of the failure such that a specifying signal is transmitted or received among the nodes, whether or not the specifying signal is received is detected by the signal monitoring means to decide whether or not the failure has occurred at a spot adjacent to itself, and a signal for specifying a decided location of the failure is transmitted or received among the nodes.