Mapping arbitrary signals into sonet

H - Electricity – 04 – J

Patent

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Details

H04J 3/07 (2006.01) H04B 10/20 (2006.01) H04J 3/16 (2006.01) H04L 12/20 (2006.01)

Patent

CA 2308968

A synchronizer/de-synchronizer maps continuous format signals of an arbitrary rate into frames of pre-selected single common rate, such as SONET frames, with no bits changed and very little jitter or wander added. In this way, the continuous format signal may be carried transparently as a tributary of a SONET network. Each frame comprises a definite number of fixed stuff bits, including transport overhead bits and reminder fixed stuff bits. A frame also comprises an adjustable number of adaptive stuff bits, resulting from the phase difference between the arbitrary rate and the common rate. A mapping function is performed in a tributary unit shelf of a SONET transport shelf, and the reverse mapping function is performed in a similar way at the far end of a SONET connection. The stuff bits are spread uniformly within the frame.

Un synchroniseur/désynchroniseur met en correspondance des signaux de format continu d'un taux arbitraire en trames de taux commun unique présélectionné, comme des trames SONET, avec aucun changement de bit et très peu d'instabilité ou de dérapage ajouté. De cette façon, le signal du format continu peut être porté de façon transparente comme un affluent d'un réseau SONET. Chaque trame comporte un nombre déterminé de bits de justification fixes, y compris des bits supplémentaires de transport et des bits de justification fixes de rappel. Une trame comprend également un nombre ajustable de bits de justification adaptatifs, résultant de la différence de phase entre le taux arbitraire et le taux commun. Une fonction de mise en correspondance est exécutée dans une unité tributaire d'une étagère de transport SONET, et la fonction de mise en correspondance inverse est effectuée de manière semblable à l'extrémité d'une connexion SONET. Les bits de justification sont répartis uniformément dans la trame.

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