Synchronizing device for terminal equipment in an...

H - Electricity – 04 – L

Patent

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Details

H04L 7/04 (2006.01) H04J 3/06 (2006.01) H04L 7/00 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2097714

A synchronizing device for terminal equipment in an asynchronous transfer mode telecommunications network, comprising a device (7) for filtering the transfer jitter which is introduced by such a network and affects the network-routed data reception rate through said equipment, and for matching the local clock signal frequency supplied by a local clock within said equipment to the frequency of a signal output by said filtering device. The synchronizing device comprises a buffer memory (MTB1, MTB2) into which said data are entered as they are received by said equipment, and a device (5, 5') for reading said buffer memory as said signal is output by said filtering and matching device, with a delay relative to the entry of said data which is determined in such a way as to minimize any risk arising from an insufficient restoration flow of read-out data during the response time of said filtering and matching device, while keeping within an acceptable data restoration delay margin.

Ce dispositif de synchronisation pour équipement d'extrémité d'un réseau de télécommunications dit à trans- fert en mode asynchrone, comportant des moyens (7) de filtrage de la gigue de transfert introduite par un tel réseau et affectant le rythme de reception, par ledit équipement, des données acheminées à travers ce réseau, et d'asservissement de la fréquence d'un signal d'horloge local délivré par une horloge locale interne audit équipement, à celle du signal issu desdits moyens de filtrage, comporte une mémoire-tampon (MTB1, MTB2), écrite avec lesdites données, à leur rythme de réception par ledit équipement, et des moyens (5, 5') de lecture de cette mémoire-tampon, au rythme dudit signal issu desdits moyens de filtrage et d'asservissement, et avec un retard, par rapport à l'écriture, déterminé de façon à minimiser les risques liés aux sous-débits dans la restitution des données à l'issue de cette lecture, pendant les temps de réaction desdits moyens de filtrage et d'asservissement, tout en restant dans une marge admissible pour le retard à la restitution de ces données.

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