Patent ID: 7974185
Filing Date: 2011-07-05
Classification: H04J,Y10S

Abstract:
1. A method for arranging traffic transmission and protection in a three fiber line switched ring (3 FLSR) network of N nodes, comprising the steps of: Providing first and second fibers traversing in opposite directions and spanning the N nodes for bidirectional line switching, wherein each of the first and second fibers includes working channels for carrying primary traffic and protection channels for carrying secondary traffic; providing an only additional fiber as a third fiber connected in a single direction in clockwise or anticlockwise direction spanning all the nodes and co-operating with the first and second fibers and supporting co-existence of unidirectional line switching and bi-directional line switching, wherein each node is configured to selectively perform addition, dropping, or passing through of transmission traffic, wherein supporting the co-existence of unidirectional line switching and bi-directional line switching comprises: using the third fiber selectively for protection when there are one or two failures, and handling additional traffic in the clockwise or anticlockwise direction when there are no failures in the 3 FLSR network of N nodes.