Clock synchronization method for synchronous Ethernets, as well as synchronous information sending/receiving method, device and apparatus

Abstract

The invention discloses a clock synchronization method for synchronous Ethernets, as well as a synchronous information sending / receiving method, device and apparatus. The clock synchronization processing performed by a network element on a looped network comprises the following steps: determining the current available clock sources, wherein line clock sources with clock identifications identical to the MAC (media access control) address of the network element can not be used; selecting a currently-used clock source from the determined current available clock sources according to the quality grade and priority of the clock sources; and transmitting a clock within the looped network, and transmitting the clock identification and clock quality information of the clock by an ESMC message, if a line clock source transmitted from the inside of the looped network is used currently, taking the clock identification of the line clock source as the transmitted clock identification, and if a clock source accessed from the outside of the looped network is used currently, taking the MAC address of the network element as the transmitted clock identification. A clock synchronization control device in the network element comprises a clock source selection device and an information transmission device. In the invention, through taking the MAC address of the network element as the clock identification, the problem that clocks on the looped network are looped is solved, and an operation of manually configuring clock identifications is not required.

Description

technical field [0001] The present invention relates to synchronous Ethernet, in particular to a synchronous Ethernet clock synchronization method, a method for sending and receiving clock synchronization information, and corresponding devices and equipment. Background technique [0002] In the evolution of telecommunication service provider networks to next-generation networks, Ethernet will gradually replace Plesiochronous Digital Hierarchy (PDH) and Synchronous Optical Network (SONET) / Synchronous Digital Hierarchy, SDH) transmission network. Therefore, in some applications that require strict synchronization of clocks, telecom service providers will face the challenge of how to transmit high-quality clocks through Ethernet. The latest standard solution is Synchronous Ethernet. [0003] In order to ensure accurate synchronization between network elements in synchronous Ethernet, it is generally required that all network element clocks can obtain synchronous reference cloc...

AI Technical Summary

Problems solved by technology

like Figure 2B As shown in the figure, when the master clock fails, the clock of NE D still uses the master clock as the clock reference source of the synchronous clock, and the quality level is the same as that of the master clock. In this way, NE A will track the clock of NE D, which eventually leads to a clock loop. However, the standby clock has not become the synchronous clock reference source of the ring network

[0008] The emergence of clock loops makes the clocks of some network elements interlocked, so that the entire synchronous network cannot normally realize the synchronization between various network elements, and of course the normal operation of each network element in the synchronous network cannot be guaranteed. High digital network is not allowed

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