Virtual protection channel for fiber optic ring network

H - Electricity – 04 – B

Patent

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Details

H04B 10/08 (2006.01) H04B 10/20 (2006.01) H04J 14/02 (2006.01) H04L 12/42 (2006.01) H04L 29/14 (2006.01)

Patent

CA 2448641

A single, normally inactive, protection ring (22) provides protection against a working channel failure in a fiber optic ring network (10). The protection channel (22) is established and put into operation by a series of steps that are triggered by the detection of signal degradation or loss of light from one transponder by the other transponder. Each node (20A, 20B, 20C, 20D) reacts to a failure of another node in substantially the same way. Incoming traffic from external sources is rerouted from a working input-output interface to a protection interface, to establish a path for the protection signal. Signals are sent between nodes enabling the two nodes to resume communication. Only the portion of the protection ring (22) between nodes (20A, 20B, 20C, 20D) is placed into service.

L'invention concerne un anneau de protection unique, généralement inactif, conférant une protection contre une défaillance d'une voie de travail dans un réseau annulaire en fibre optique. La voie de protection est établie et mise en service par une série d'étapes déclenchées par la détection d'une dégradation ou d'une perte de signal de rayonnement lumineux provenant d'un transpondeur par l'autre transpondeur. Chaque noeud réagit à une défaillance d'un autre noeud sensiblement de la même manière. Un trafic entrant provenant d'une source externe est réacheminé à partir d'une interface de travail d'entrée/sortie vers une interface de protection, en vue d'établir un chemin pour le signal de protection. Des signaux sont envoyés entre des noeuds de manière à permettre aux deux noeuds de reprendre une communication. Seulement la partie de l'anneau de protection située entre des noeuds est mise en service.

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