电讯技术2025，Vol.65Issue(4)：566-572,7.DOI:10.20079/j.issn.1001-893x.240412002
一种采用SDH网络的异地时钟同步技术
A Novel Remote Clock Synchronization Technology Based on SDH Network
季强 1孟令刚 2史国鑫 3井实 3滕云龙3
作者信息
- 1. 沈阳飞机设计研究所,沈阳 110035
- 2. 中国测试技术研究院,成都 610021
- 3. 电子科技大学 机械与电气工程学院,成都 711731
- 折叠
摘要
Abstract
Time synchronization needs to be achieved across a wide area between remote sites.In addition to using satellite timing,it is hoped to use synchronous digital hierarchy(SDH)network for online monitoring of time synchronization performance.However,the SDH network structure in a wide area is complex,with a large number of hops,and there are many asymmetric uplink and downlink lines,which poses a challenge to traditional network time synchronization technology.Therefore,a link model based on White Rabbit Precision Timing Protocol(WR PTP)technology is proposed,which considers various delay links and their calculation methods in SDH networks.And in response to the asymmetric link delay that exists in actual networks,a correction method is proposed,and a correction calculation formula for clock bias is derived.Meanwhile,engineering solutions have been provided for the link switching problem in SDH ring networks.The methods proposed have been tested on actual SDH networks and the results show that the time synchronization error is no more than 1 μs,so they can meet the needs of online monitoring of time synchronization performance.关键词
时间同步/在线监测/SDH网络/WR PTPKey words
time synchronization/online monitoring/SDH network/WR PTP分类
信息技术与安全科学引用本文复制引用
季强,孟令刚,史国鑫,井实,滕云龙..一种采用SDH网络的异地时钟同步技术[J].电讯技术,2025,65(4):566-572,7.
