Based on SDH E1 Transmission Channel Time Synchronization Accuracy Factors

Time synchronization precision based on SDH E1 channel is affected by transmission delay of fiber, sam- pling 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.