SDH光通信系统E1通道时间传递特性测试分析

文章介绍了在实验室和现场环境中对El业务通道时延特性的测试结果,描述了测试系统和测试过程,给出了噪声干扰和通道异常对时延特性的影响,并对测试结果进行系统分析.经过测试可以得出E1通道传递时间信号的基本规律:线路/光路中断以及设备停复机对通道时延的影响较小(一般小于10μs)；SDH同步解列对时延的影响较大(约20μs),所以利用SDH传递时间应严格要求SDH通信系统同步；误码和通道保护对时延的影响很大(大于200 μs),所以利用SDH传递时间应采取一定的措施来判断误码和通道保护的发生,并对时延进行相应补偿.

Test and Analysis of Transmission Time on E1 Path of SDH Network

A test system is set up in the laboratory environment and on-site environment using SDH-transmission-time technology.We do wide range of tests for time-delay characteristics of transmission on both business path and overhead path to test how the operating conditions,noise disturbance and abnormal circumstances infecting the characteristics.The paper researches the performance of SDH-transmission-time technology by combining actual test and theoretical analysis.The basic rules of transmission time obtained from the tests on E1 path of SDH network are: line/optical interrupts and devices halt have less impact on the channel delay(generally less than 10 us);SDH synchronous splitting has a greater impact on the delay(20 us),so SDH communication system synchronization is highly required;Error and channel protection have great impact on the delay(greater than 200 us),so certain actions should be taken to estimate error and protect channel as well as to compensate the time delay.