Patent ID: 6947374
Filing Date: 2005-09-20
Classification: H04L,H04Q

Abstract:
1. A connection oriented mode communication system for use in a communication system composed of a plurality of node apparatus, comprising: alternative connection setting means for setting a communication connection as an alternative connection substitutive for an original connection which is a currently working communication connection, so that the alternative connection connects a source node apparatus and a destination node apparatus of the original connection to each other by way of a route physically different from that of the original connection; switching control means for controlling switching between the original connection and the alternative connection; a connection test unit connected to a node apparatus testing the normality of the alternative connecting, the connection test unit includes a layer normality confirming means for confirming the normality of each of a physical layer, an adaptation layer and an ATM layer of the alternative connection, wherein the alternative connection setting processing means includes a test connection setting processing unit which carries out setting processing of a test communication connection which leads the alternative connection to the connection test unit, the switching control means includes a test switching unit which carries out switching from the original connection to the alternative connection when the connection test unit confirms the normality of the alternative connection, and the test switching unit is arranged to carry out switching from the original connection to the alternative connection when the layer normality confirming means confirms the normality of all layers.