Group facility protection in a digital telecommunications...

H - Electricity – 04 – Q

Patent

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Details

H04Q 3/44 (2006.01) H04J 3/14 (2006.01) H04L 12/24 (2006.01) H04L 29/14 (2006.01) H04M 3/32 (2006.01) H04Q 3/00 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2096401

A telecommunications system having 1:n group facility protection is disclosed. Two-cross-connects are provided, each organized in a distributed fashion, and which have a group of member ports bidirectionally coupled to one another in corresponding fashion via a plurality of paths, such as of the DS-3 data frame type. Each of the cross-connects also include a bidirectional protection port, coupled to the protection port of the other cross-connect by way of a protection path, also preferably of the DS-3 type; the protection port for each cross-connect is assigned to the member port group, and is implemented to be managed by the same distributed interface processing unit as the protected member port group. The cross-connects monitor their member input ports for received facility errors, such as signal failures or excessive failure rates, and request a third-stage bridge from its mate cross-connect in the event of such error. Upon receipt of a good signal at the protection input port, the requesting cross-connect effects a first stage switch, so that the previously failing facility is received over the protection path. Communication of request and acknowledge signals over the protection path is preferably by way of the C-bit and X-bit channels, for DS-3 paths. The switch preferably reverts to the normal condition responsive to the facility becoming valid for a timeout period at the original member port.

Système de télécommunication avec protection 1:n de groupes de circuits. Comprend deux interconnexions, chacune étant organisée de manière répartie; un groupe de ports membres sont couplés bidirectionnellement entre eux au moyen d'un certain nombre de trajets, p. ex. de type trame de données DS-3. Chacune des interconnexions comprend en outre un port de protection bidirectionnelle, couplé au port de protection de l'autre interconnexion au moyen d'un trajet de protection, également de préférence du type DS-3; le port de protection de chaque interconnexion est affecté au groupe de ports membres et mis en oeuvre de façon à être géré par la même unité de traitement d'interface répartie que le groupe de ports membres protégés. Les interconnexions contrôlent les erreurs reçues sur les circuits à leurs ports d'entrée membres, p. ex. les défaillances de signal ou les taux de défaillances excessifs, et demandent aux interconnexions qui leur sont jumelées une conversion de troisième niveau en cas de défaillances. Sur réception d'un bon signal au port d'entrée de protection, l'interconnexion demandeuse effectue une commutation de premier niveau, de manière que les données du circuit défectueux soient reçues sur le trajet de protection. La communication des signaux de demande et d'accusé de réception sur le trajet de protection se fait de préférence sur les canaux de bits C et de bits X, pour les trajets D-3. Le commutateur revient de préférence à l'état normal lorsque le circuit défectueux redevient valide pendant un certain temps au port membre d'origine.

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