A synchronisation method and arrangement

Details A synchronisation method and arrangement A synchronisation method and arrangement

H - Electricity

04

L

H04L 7/00 (2006.01) H04L 7/08 (2006.01)

Patent

CA 2360591

The present invention relates to a method and to an arrangement for synchronising at least one local oscillator (21) with a central time-generating unit (11). The local oscillator (21) serves a so-called element (2) included in a network (A), and the time-generating unit (11) is included in a so-called main unit (1) also included in the network (A). The frequency of the local oscillator (21) can be controlled by periodic and automatic calibration. The physical requirements within a part of the network (A) that includes the main unit (1) and all elements (2, 3, 4) concerned, said part being referred to here as a limited network (B), are so well defined that the transmission time of a time stamp from the main unit (1) to an element (2) will be known with a given degree of certainty. The inter-arrival time of the time stamps is used to calibrate the local oscillator (11) together with the known transmission time.

La présente invention concerne un procédé et un dispositif permettant de synchroniser au moins un oscillateur local avec une horloge centrale (11). L'oscillateur local (21) vient constituer un élément (2) intégré à un réseau (A), l'horloge (11) étant intégrée à une unité principale (1) également incluse dans le réseau (A). La fréquence de l'oscillateur (21) peut se commander par étalonnage périodique et automatique. On a si bien défini des exigences physiques dans les limites d'une partie du réseau constituant ici un réseau limité (B), que le temps de transmission d'un groupe date-heure de l'unité principale (1) vers un élément (2) peut systématiquement être connu avec un certain niveau de certitude. Les temps entre arrivées des groupes date-heure sert à l'étalonnage de l'oscillateur local (11) ainsi que du temps de transmission connu.

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