Frame alignment

H - Electricity – 04 – L

Patent

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Details

H04L 7/08 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2277939

The invention is directed to frame alignment of a digital link which interconnects two entities. Frames in which overhead is interleaved with payload are considered. In accordance with a general inventive concept, the fame alignment is executed in two phases such that the actual frame alignment, in which a predetermined frame alignment word (FAW) is found, is preceded by a procedure called "column alignment". The idea with column alignment is to find the positions for the overhead columns or overhead bits of a pending frame of payload and interleaved overhead. During column alignment, the transmitting entity will send an easily detectable column alignement word (CAW) and the receiving entity will quickly recognize the overhead bit positions in the interleaved frame. When the positions for the overhead bits have been detected, the transmitting entity will start to send Normal Frames and the receiving entity will gain final frame alignment by finding the FAW in the overhead bit positions.

L'invention concerne le verrouillage de trame d'une liaison numérique entre deux entités, et, en particulier, les trames dans lesquelles les données techniques sont entrelacées aux données utiles. En l'occurrence, le verrouillage de trame s'exécute en deux temps: le verrouillage de trame actuel, dans lequel on trouve un mot de verrouillage de trame (FAW) déterminé, est précédé d'une procédure appelée "verrouillage colonne". Ce verrouillage colonne permet de trouver les positions des colonnes de données techniques ou bits de données techniques d'une trame en attente de données utiles et de bits de données techniques entrelacées. Pendant le verrouillage colonne, l'entité émettrice envoie un mot de verrouillage colonne (CAW) facilement détectable à la suite de quoi l'unité réceptrice reconnaît rapidement les positions des bits de données techniques de la trame entrelacée. Une fois détectées les positions des bits de données techniques, l'unité émettrice commence à envoyer des trames normales et l'unité réceptrice obtient un verrouillage de trame final en trouvant le FAW dans les positions des bits de données techniques.

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