SDH网络承载广域保护时间同步信息研究  

Research on Time Synchronization Information of Wide Area Protection in SDH network

作　　者：金鑫[1] 文安[1] 蔡耀广 卓越[3] 黄盛[3] 黄维芳[1] 刘年[1] 

机构地区：[1]中国南方电网电力调度控制中心,广东广州510623 [2]佛山供电局,广东佛山528000 [3]中国能源建设集团广东省电力设计研究院,广东广州510670

出　　处：《电力信息与通信技术》2015年第5期22-25,共4页Electric Power Information and Communication Technology

摘　　要：广域保护业务对时间同步要求较高,如果SDH网络发生链路倒换会造成路由发生变化,导致传输时延发生变化,可能会对时间同步设备输出的时间信息造成较大的误差,无法达到广域保护业务的时间精度要求。为消除路由倒换时延对广域保护的影响,文章研究了IEEE 1588v2时钟协议原理,提出了SDH网络的路由变化监测和路由倒换时延补偿的方法,以降低路由倒换造成的时间误差。通过组网测试,测试结果表明采用该方法可以有效降低SDH网络路由切换对授时精度的影响,满足广域保护业务的时间精度要求。Wide area protection business requires more stringent time synchronization. When routing switching of SDH network occurs, the routing of PTP packets and one-way delays will be changed. The time synchronization device will result in large errors and cannot meet the time accuracy requirements of the wide area protection. To eliminate the above impacts, this paper studies the 1588v2 clock protocol and proposes a routing switching monitoring mechanism and a routing delay compensation method. It can reduce the time errors caused by the routing switching. Network testing result has proven that the proposed method can meet the time accuracy requirements of the wide area protection.

关 键 词：SDH传输网 路由倒换 广域保护 IEEE 1588v2协议 

分 类 号：TN914.3[电子电信—通信与信息系统]