Apparatus and method for limiting jitter in a...

H - Electricity – 04 – J

Patent

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H04J 3/07 (2006.01) H04B 10/18 (2006.01) H04J 3/06 (2006.01)

Patent

CA 2191849

In a system where jitter in a first telecommunications signal (e.g., TUG-3) which is being mapped into a second telecommunications signal (e.g., STS-3C) is reduced by moving the TUG-3 pointer in the opposite direction of the pointer movement of STS-3C signal, the improvement is in suspending FIFO measurement (504) from the time of the STS-3C pointer movement until the next TUG-3 stuff or destuff, and in further limiting jitter by moving the measurement points for the TUG-3 FIFO measurements without conducting TUG-3 pointer movements when the TUG-3 pointer movement would otherwise be moved into or over the transport overhead of the TUG-3 signal. The TUG-3 pointer movement is held in abeyance until two additional pointer movements in the same direction are received, and then the jump is made.

Dans un système, on réduit l'instabilité d'un premier signal de télécommunications (p. Ex., TUG-3) transformé en un second signal de télécommunications en déplaçant le pointeur TUG-3 dans la direction opposée au mouvement du signal STS-3C. L'amélioration consiste à suspendre les mesures en liste directe (504) (système premier entré, premier sorti) pendant la période s'écoulant entre l'instant du premier mouvement du pointeur STS-3C et l'instant du premier bourrage ou débourrage TUG-3, puis à limiter l'instabilité en déplaçant les points de mesure concernant les mesures TUG-3 en liste directe sans déplacer le pointeur TUG-3 si le mouvement du pointeur TUG-3 est susceptible d'être transféré à l'intérieur ou au-dessus de l'amorce du signal TUG-3. Le mouvement du pointeur TUG-3 est en suspens jusqu'à réception de deux mouvements supplémentaires du pointeur dans la même direction, à la suite de quoi le système exécute le branchement.

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