Isdn d channel restoration without loss of signaling or...

H - Electricity – 04 – M

Patent

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H04M 3/18 (2006.01) H04J 3/12 (2006.01) H04Q 3/00 (2006.01) H04Q 3/42 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2202955

A communication switching system has a plurality of switch nodes with each of the switch nodes responsive to a failure of the primary signaling channel that is providing the common signaling channel in a facility access service (FAS) group to immediately switch to the secondary signaling channel of the FAS group. This switching occurs quickly so that no calls are dropped within the FAS group. Any logical links being communicated on the primary signaling channel are transferred to the secondary signaling channel with no data packets being irreplaceable lost. A first physical object is established to control a physical protocol on the primary signaling channel, and a second physical object is established to control the physical protocol on the secondary signaling channel. Further, a single software object is established to always control the first layer of software protocol on the common signaling channel whether that is the primary signaling channel or secondary signaling channel. When failure of the primary signaling channel is detected, information for the common signaling channel is routed from the second physical object to the software object, thereby preserving the common signaling channel.

Système de commutation de communications comportant un certain nombre de noeuds de commutation qui sont chacun sensibles à une panne du canal de signalisation primaire qui constitue le canal de signalisation commune dans un groupe de service d'accès aux installations (FAS). En cas de panne, ils commutent au canal de signalisation secondaire du groupe FAS. Cette commutation se produit rapidement de manière qu'aucun appel n'est abandonné dans le groupe FAS. Toute liaison logique assurée sur le canal de signalisation primaire est transférée au canal de signalisation secondaire et aucun paquet de données n'est perdu irrémédiablement. Un premier objet matériel est établi afin de contrôler un protocole matériel sur le canal de signalisation primaire et un deuxième objet matériel est établi pour contrôler le protocole matériel sur le canal de signalisation secondaire. En outre, un seul objet logiciel est établi afin de contrôler constamment la première couche de protocole logiciel sur le canal de signalisation commune, qu'il s'agisse du canal de signalisation primaire ou du canal de signalisation secondaire. Lorsqu'une panne du canal de signalisation primaire est détectée, l'information au sujet du canal de signalisation commune est acheminée du deuxième objet matériel à l'objet logiciel, ce qui maintient le canal de signalisation commune.

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