Clock synchronization method and device

Abstract

The invention provides a clock synchronization method. The method comprises the steps of sending Topology messages to other clock node devices through ports on two sides according to a preset low sending frequency; receiving Topology messages sent by the other clock node devices through the ports on two sides; constructing a network topology table according to the received Topology messages, wherein the network topology table contains the priority vector of each port through which the Topology messages are sent; determining whether the device is an optimal clock node device according to the priority vector of each port; if yes, releasing synchronous clocks to the other clock node devices through a main port; if not, determining the main port and a slave port from the ports on two sides according to the network topology table, and receiving the synchronous clock released by the optical clock node device through the slave port to achieve the updating of a local clock; forwarding the synchronous clock to a next hop of node device through the main port. By the adoption of the clock synchronization method, convergence time of port role calculation can be reduced, and the stability of a system can be improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a clock synchronization method and device. Background technique [0002] In a communication network, the normal operation of many services requires network clock synchronization, that is, the time or frequency difference between devices in the entire network is kept within a reasonable error level. Network clock synchronization includes time synchronization and frequency synchronization. The so-called time synchronization means that the frequency and phase between the signals are consistent, that is, the phase difference between the signals is always zero; the frequency synchronization means that the frequency between the signals Or maintain a strict specific relationship in phase, and the signals appear at the same average rate at their corresponding effective instants to ensure that all devices in the communication network operate at the same rate, that is, maint...

AI Technical Summary

Problems solved by technology

[0007] However, for PTP ring networking, it usually takes more time to re-converge the time synchronization path due to link failure or recovery, especially when there are many devices in the ring network, it is necessary to notify the failure level by level and Port roles are recalculated, so time synchronization will be interrupted for longer periods of time, potentially causing time desync between devices

Images