Patent ID: 7848646
Filing Date: 2010-12-07
Classification: H04J,H04L,H04Q

Abstract:
1. An optical network comprising: a first node including a switch unit and connected to communication paths, a second node including a switch unit and connected to communication paths for communicating with said first node, a third node including a switch unit and connected to communication paths for relaying communication of said first node and said second node, and a fourth node including a switch unit and connected to communication paths for relaying communication of said first node and said second node, and a network management system connected to a plurality of nodes including said first node, said second node, said third node, and said fourth node, thereby forming a communication path; wherein said network management system performance-monitors a first performance monitoring section on a working path between said first node and said third node, and performance-monitors a second performance monitoring section on said working path between said third node and said second node; wherein said network management system monitors links of a first spare path as a bypass between said first node and said third node, and a second spare path as a bypass between said third node and said second node; and wherein when detecting that a fault has occurred between said third node and an adjacent node, which are included in at least one of said first spare path and said second spare path, said network management system sets a third spare path which connects said fourth node but does not include an area between said third node and said adjacent node, and performance-monitors a third performance monitoring section between said first node and said fourth node and a fourth performance monitoring section between said fourth node and said second node.