SDH传输网络时钟倒换分析及配置优化方案  

Switching Analysis and Optimized Configuration Scheme of Clocks for SDH Transmission Network

作　　者：付强 FU Qiang

机构地区：[1]中国铁路广州局集团有限公司广州通信段,广州510000

出　　处：《铁道通信信号》2024年第8期47-51,共5页Railway Signalling & Communication

基　　金：中国铁路广州局集团有限公司科研项目(2021K091-Z)。

摘　　要：针对广州局厦深线SDH传输网络时钟倒换过程中出现的时钟环路问题,通过研究SDH网元的组网架构,确认在时钟倒换过程中,各网元SDH的时钟来源发生了变化;分析SDH的常见时钟源种类,确认SDH时钟根据同步状态信息来区分时钟同步质量等级;分析SDH时钟倒换流程,明确广州局SDH同步时钟组网配置的原则,由此提出SDH时钟配置的优化方案;结合厦深线SDH网元的组网架构,优化SDH网元主备定时链路时钟配置。调整后进行复测,该方案极大程度降低了SDH网元发生时钟环路的风险,对铁路通信设备维护具有参考意义。To solve the clock loop problem in clock switching of the SDH transmission network for Xiamen-Shenzhen Railway,the networking architecture of the SDH network elements of this line is studied to identify the clock source changes of each network element's SDH during clock switching.By analyzing the common types of clock sources in SDH,it is confirmed that the clock of SDH distinguishes the quality level of clock synchronization based on synchronization status information.By further analyzing the SDH clock switching process,the principles for configuring the SDH synchronous clock networking of China Railway Guangzhou Group are clarified and optimization scheme are proposed for SDH clock configuration.In combination with the networking architecture of the SDH network elements for Xiamen-Shenzhen Railway,the clock configuration for main and backup timing links of SDH network elements is optimized.A retest conducted after the adjustment demonstrates that the scheme greatly reduces the risk of clock loop in SDH network elements,providing a reference for maintenance of railway communication equipment.

关 键 词：SDH传输网络 时钟源 时钟同步 时钟倒换流程 时钟环路 网络优化 

分 类 号：U285.1[交通运输工程—交通信息工程及控制]