Semi transparent tributary for synchronous transmission

H - Electricity – 04 – L

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Details

H04L 29/10 (2006.01) H04J 3/16 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2322908

An interface for converting a variety of incoming digital signals into SDH/SONET format for transmission on a synchronous digital network, by identifying the line code of the incoming digital signal, without identifying the information for OSI layer 2 or 3 processing, i.e. format of each packet. Headers are used to encapsulate incoming packets, and enable packets to be discriminated at the receiver. Advantages of performance monitoring capability and transparency are combined. Identifying line codes enables a greater degree of error detection, than a bit based interface. Also synchronisation can be simpler since line codes for padding can be added or deleted more easily than adding or subtracting bits. The interface is semi--transparent in the sense that identification of line codes limits the interface to those formats that use identifiable line codes, but without limiting to a particular OSI layer 2 or 3 frame format.

La présente concerne une interface pour la conversion d'une variété de signaux numériques entrants dans le format SDH/SONET pour la transmission sur un réseau numérique synchrone, en identifiant le code de ligne du signal numérique entrant, sans identifier l'information pour le traitement de la couche OSI 2 ou 3, c.-à-d. le format de chaque paquet. Des en-têtes sont utilisés pour encapsuler les paquets entrants, et permettre la discrimination des paquets sur le récepteur. Les avantages de la transparence et de la capacité de suivi de la performance sont combinés. L'identification des codes de ligne permet un plus grand degré de détection des erreurs qu'une interface basée sur les bits. Aussi, la synchronisation peut être plus simple puisque des codes de ligne de remplissage peuvent être ajoutés ou supprimés plus facilement que des bits. L'interface est semi-transparente en ce sens que l'identification des codes de ligne limite l'interface aux formats qui utilisent des codes de ligne identifiables, mais sans se limiter à un format de trame particulier pour la couche OSI 2 ou 3.

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