一种基于以太网传输提高时间戳精度的方法  

A Method for Improving the Accuracy of Time Stamp based on Ethernet Transmission

作　　者：刘月明 董航[2] LIU Yue-ming;DONG Hang(Wuhan Research Institute of Posts and Telecommunications,Wuhan 430074,China;FiberHome Telecommunication Technologies Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]武汉邮电科学研究院,武汉430074 [2]烽火通信科技股份有限公司,武汉430074

出　　处：《光通信研究》2021年第1期30-35,共6页Study on Optical Communications

摘　　要：以太网传输对时钟同步精度的要求很高,不同时钟域的切换和数据位宽变换等因素会导致精确时钟协议帧中的时间戳抖动幅度过大,严重影响时钟同步的性能。针对这一问题,文章提出了一种可以消除时间戳抖动来提高时间戳精度的方法——均匀包络速率刻画,通过刻画均匀的数据包络来保证以太网传输数据分布的均匀性,从而消除时间戳抖动,达到时钟精确同步的效果。实验数据表明,对数据进行均匀速率包络刻画后,时间戳抖动幅度明显降低,抖动消除效果较为明显,抖动范围保持在±20 ns之内。Ethernet transmission has high requirements of clock synchronization accuracy.Factors such as switching between different clock domains and data bit width conversion will enlarge the jitter amplitude of the time stamp in the Precision Time Protocol(PTP)frame,resulting in the problem of clock asynchronization.In order to solve this issue,this paper proposes a method that can eliminate the jitter of the time stamp to improve the accuracy of the time stamp-uniform envelope rate characterization,which ensures the uniformity of the Ethernet transmission data distribution by depicting a uniform data envelope.Therefore,the time stamp jitter can be eliminated and precise clock synchronization is achieved.Experimental data shows that after the data is characterized by a uniform rate envelope,the jitter amplitude of the time stamp is significantly reduced with obvious the jitter elimination,and the jitter range remains within±20 ns.

关 键 词：以太网传输 精确时钟协议帧 时间戳抖动 均匀包络速率刻画 精确同步 

分 类 号：TN919.2[电子电信—通信与信息系统]