Patent ID: 7319663
Filing Date: 2008-01-15
Classification: H04J,H04L,H04Q

Abstract:
1. A method for controlling switching in a bidirectional line-switched ring network configured with a plurality of optical fibers and a plurality of nodes where a switch request is transferred by using only K bytes, wherein (a) under a first state where a first node receives as input an LP-S (lockout of protection (span)) command and a second node adjacent to the first node receives the switch request from the first node via the optical fibers, said method comprises the steps of: wherein (b) under a second state where the first node detects a failure in a receiving protection channel from the adjacent second node and the second node receives the switch request from the first node via, the optical fibers, said method comprises steps i) and ii) and further comprises the steps of: vi) the first node executing the ring switch after receiving the ring switch request from the second node.