Method and system for identifying fault locations in a...

H - Electricity – 04 – L

Patent

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H04L 12/24 (2006.01) H04L 1/24 (2006.01) H04M 3/08 (2006.01) H04M 3/22 (2006.01) H04Q 3/00 (2006.01)

Patent

CA 2222160

All nodes (12-24) on a malfunctioned communications circuit (42A) of a communications network are enabled to identify the location of the fault (92) causing the circuit malfunction. Upon detecting an incoming signal impairment on the circuit (402), each node (12-24) on the circuit first assumes that the failure is on the segment (42) of the circuit immediately upstream thereof, and accordingly sends an identifier (410) of that fault location to its downstream nodes (18-24). Each node (12-24) periodically repeats sending its identifier (410) to its downstream nodes (18-24). A node (12-24) that has sent its identifier at least a predetermined number of times without receiving a similar identifier from another node upstream thereof (406) or without having detected a normal signal during all that time is determined to have sent out an identifier that correctly identifies the fault on the communications circuit (414). If, on the other hand, a node (18-24) receives a fault location identifier from a node (12-16) upstream thereof before it has completed sending its identifier a predetermined number of times (418), then that node would stop sending its own identifier downstream. And upon receiving the same fault location identifier from an upstream node (12-18) a predetermined number of times, that node further recognizes that the received identifier represents the correct location of the fault (420).

Tous les noeuds (12-24) d'un circuit de communications (42A) défaillant d'un réseau de communications sont rendus capables de localiser la défaillance (92) provoquant le mauvais fonctionnement du circuit. Lors de la détection sur le circuit (402) d'un défaut du signal entrant, chaque noeud (12-24) du circuit suppose d'abord que la défaillance se trouve sur le segment (42) du circuit situé immédiatement en amont, et envoie en conséquence, un identificateur (410) de cette localisation de défaillance à chacun de ses noeuds d'aval (18-24). Chaque noeud (12-24) envoie son identificateur (410) à chacun de ses noeuds aval (18-24) de manière répétée et périodique. Un noeud (12-24), qui a envoyé son identificateur au moins un nombre de fois prédéterminé sans recevoir d'identificateur similaire de la part de l'autre noeud d'amont (406) ou sans avoir détecté un signal normal durant tout ce temps, est considéré comme ayant envoyé un identificateur qui identifie correctement l'emplacement de défaillance dans le circuit de communications (414). Si, en revanche, un noeud (18-24) reçoit de la part d'un noeud d'amont (12-16) un identificateur d'emplacement de défaillance avant d'avoir réalisé l'envoi de son identificateur un nombre de fois prédéterminé (418), ce noeud cessera d'envoyer son propre identificateur en aval. Et lors de la réception du même identificateur d'emplacement de défaillance provenant d'un noeud amont (12-18) un nombre de fois prédéterminé, ce noeud considère que l'identificateur reçu correspond à l'emplacement correct de la défaillance (420).

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