基于SDH E1信道时间同步传输精度影响因素分析

Based on SDH E1 Transmission Channel Time Synchronization Accuracy Factors

摘要:

基于SDH E1信道的时间同步传输精度受到时延、采样误差、码速调整、指针调整等因素的影响。本文对光缆传输时延和设备处理时延进行了分析，通过示意图和案例对采样误差进行了解释并得出结论，通过比较两个固定门限与读写时差的关系确定码速调整将带来时延的变化，进一步分析了指针处理器根据“门限范围”来决定调整输出指针，给出了规划的建议和需要注意的事项。

Abstract: Time synchronization precision based on SDH E1 channel is affected by transmission delay of fiber, sampling error, code-speed adjustment, pointer adjustment and so on. This paper analyzed optical transmission delay and processing delay of devices, and drew a conclusion via explaining a schematic diagram of the sampling error and the case. Comparing the difference of two fixed thresholds, we determine the relationship between literacy and time code rate adjustment which will bring changes. Furthermore, we analyze the pointer processor based on “threshold” to decide and adjust the output pointer to give the proposal planning and the matters that need attention.