Method and system for multi-GM (Grand Master) equipment time synchronization in packet transport network

Abstract

The invention discloses a method and a system for multi-GM (Grand Master) equipment time synchronization in a packet transport network. The method comprises the following steps of: deploying a plurality of grand masters GM in a networking; and selecting one GM from a plurality of GMs to be tracked according to a pre-set time synchronization strategy by downstream equipment. The system comprises a GM deploying module and one or more downstream equipment, wherein the grand master GM deploying module is used for deploying the plurality of GMs in the networking; and the downstream equipment is used for selecting one GM from the plurality of GMs to be tracked according to the pre-set time synchronization strategy. According to the method and the system disclosed by the invention, a multi-GM time synchronization manner concept is introduced and the downstream equipment does not rigidly track the same GM at the same time, so that the networking limiting problem caused by a single-GM time synchronization manner and the problem that a time accumulated error of the downstream equipment is large in the large-sized networking can be solved; and the flexibility of the networking is increased and the time synchronization performance of the equipment is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and system for time synchronization of multiple GM (GrandMaster, root clock) devices in a packet transmission network. Background technique [0002] In a packet transport network, the time synchronization function of root clocks between devices is essential, and most of them use the 1588v2 protocol to realize the function of time root clock synchronization. [0003] In the current 1588v2 standard, due to the limitation of the data set comparison algorithm, it can only support a single GM (GrandMaster, root clock) time synchronization method, that is, all devices in the entire network track the same GM root clock at the same time. If the current master GM root clock is normal, no device will track the backup GM root clock. If the current master GM root clock fails, all downstream devices will track the backup GM root clock. However, only a single GM time synchronization is suppo...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method and system for time synchronization of multiple GM devices in a packet transmission network, so as to solve the problem of network limitation and the time accumulation error of downstream devices brought about by the single GM time synchronization method in a large-scale network For larger problems, increase the flexibility of networking and improve the time synchronization performance of devices

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