Method and system for detecting failure of ring network

Details Method and system for detecting failure of ring network Method and system for detecting failure of ring network

H - Electricity

04

L

H04L 12/437 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2312870

A pair of transmission lines (14), (15), one for a current system and the other a standby system, pass through child stations (12) in opposite directions from/to a parent station (11). Each child station (12) has a switch for connecting the current system transmission line (14) to the standby system transmission line (15) based on control information from the parent station (11) to form a small loop passing through the parent station (11). A failed part is found by circulating a test cell from the parent station (11) through the small loop, and then the child stations (12) adjacent to the failed part are controlled to form a turn-back loop to maintain the communication. After being recovered from the failure, the turn-back loop is canceled based on control information from the parent station (11), and the system including the recovered child station (12) is recovered to the initial one.

Une paire de lignes de transmission (14) (15), l'une pour un système normal et l'autre pour un système de réserve, traverse des stations successeurs (12) dans des sens opposés depuis/vers une station parente (11). Chaque station successeur (12) possède un commutateur servant à connecter la ligne de transmission (14) du système normal à la ligne de transmission du système de réserve (15) en fonction d'une information de commande émise par la station parente (11), de manière à constituer une petite boucle passant à travers la station parente (11). La recherche d'une partie défectueuse consiste à faire circuler une cellule d'essai depuis la station parente (11) à travers la petite boucle, puis à commander les stations successeurs (12) contiguës à la partie défectueuse, de manière à créer une boucle fermée afin de maintenir la communication. Après avoir solutionné la défaillance, on annule la boucle fermée en fonction de l'information de commande émise par la station parente (11) et on remet le système à l'état initial, y compris la station successeur restaurée (12).

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