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扼要介绍了ＰＤＨ各级数字系列的帧结构，着重讨论了ＡＴＭ信元向ＰＤＨ信号帧映射的原理与方法
The frame structure of digital series at all levels of PDH is briefly introduced. The principle and method of ATM cell-to-PDH signal frame mapping are emphatically discussed