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光同步数字传输网（SDH）由于采用指针调整技术进行同步复用，可能会给经由SDH传送的难同步数字信号带来较大的抖动损伤。首先给出了用计算机模拟计算SDH指针调整在PDH信号上产生抖动的方法及其模拟结果，然后对这种抖动进行了理论分析。
Optical Synchronization Digital Transmission Network (SDH) Synchronous multiplexing with pointer adjustment techniques can cause large jitter impairments to hard-to-synchronize digital signals transmitted over SDH. Firstly, the method of simulating the SDH pointer to adjust the jitter generated in the PDH signal is given and the simulation results are given. Then the theoretical analysis of the jitter is carried out.