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目录第一部分...........................................................................................9第一章.................................................................................................概述.................................................................................................................101.1SDH的产生...............................................................................................................................101.2SDH的基本概念....................................................................................................................121.3SDH的应用和发展.............................................................................................................................14小结...........................................................................................................................................................15第二章.........................................................................帧结构与开销功能.................................................................................................................162.1SDH网络节点接口...............................................................................................................162.2STM-N帧结构..........................................................................................................................162.3段开销...........................................................................................................................................192.4通道开销(POH)...................................................................................................................202.4.1高阶通道开销(HPOH)..........................................................................................................202.4.2低阶通道(VC-1/VC-2)开销(LPOH)................................................................................20小结..........