一种PTN网络中IEEE 1588v2非对称时延的解决方案  

A solution to the problem of delay asymmetry for IEEE 1588v2 in packet transport network

作　　者：彭良福[1] 李有生 黄勤珍[1] 

机构地区：[1]西南民族大学电气信息工程学院,成都610041 [2]成都泰富通信有限公司,成都610041

出　　处：《光通信技术》2013年第7期1-3,共3页Optical Communication Technology

基　　金：成都市科技计划项目(12GGYB218GX-001)资助;西南民族大学科研项目(12NZYTH01)资助

摘　　要：针对IEEE 1588v2协议双纤双向传输的非对称时延问题,采用粗波分复用技术实现主从端的精确时间同步,解决了非对称时延问题。分析了色散、折射率和温度等因素对单纤双向传输时延的影响,给出了实现精确时间同步的试验方案,并在中国移动的PTN现网中进行了试验。结果表明,采用该方法不仅能够达到时间同步的精度要求,而且可以节省光纤。In order to solve the problem of delay asymmetry for IEEE 1588v2 implementing in two-fiber bidi- rectional network, a method is offered to enhance time synchronization precision by making use of the tech- nology of Coarse Wavelength Division Multiplexing （CWDM）. Various factors which affect communication link delay, such as optical fiber dispersion, refractive index and environmental temperature are analyzed and discussed when CWDM technology applies to bidirectional transmission. A test scheme is designed to verify the precision of clock synchronization. Test result in a live PTN of China mobile demonstrate that it is not only satisfies the precision criterion of time synchronization but also save much optical fiber.

关 键 词：1588v2 分组传送网(PTN) 非对称时延 粗波分复用 

分 类 号：TN913.7[电子电信—通信与信息系统] TN915.04[电子电信—信息与通信工程]