SDH网的定时结构设计

传输网络定时是SDH网同步设计中的一个重要层面.首先介绍了定时保护倒换规则,然后分析了在设计过程中可能遇到的由于时钟倒换快慢引起的假定时环路问题,提出了科学规划的解决方法,最后得出了简单易行的传输网络定时环状结构.该结构解决了假定时环路问题,可应用于工程实际.

Design of timing mechanism in SDH network

The timing technique of transmission network is an important part of the design of network synchronization of SDH. This paper first introduces the switch rule of timing protection, then analyses the fake timing loop caused by clock switching at different speeds,and provides a scientific solution. Finally, the loop structure applicable for timing of transmission network is worked out. The structure can overcome the shortcoming of fake timing loop and be used in engineering.