重庆信科设计有限公司新员工技术培训——SDH光传输技术及传输设备安装工程授课人：殷茜2004-7-8第一章SDH传输技术理论基础...........................................................41.1SDH概述.........................................................................41.1.1SDH产生的技术背景——为什么会产生SDH传输体制...............................41.1.2与PDH相比SDH有哪些优势.....................................................61.1.3SDH的缺陷所在...............................................................81.2SDH信号的帧结构和复用步骤.......................................................91.2.1SDH信号——STM-N的帧结构...................................................91.2.2SDH的复用结构和步骤........................................................101.1.1140Mbit/s复用进STM-N信号......................................................121.1.234Mbit/s复用进STM-N信号.....................................................151.1.32Mbit/s复用进STM-N信号......................................................161.2.3映射、定位和复用的概念.....................................................181.1.4异步映射.....................................................................191.1.5比特同步映射.................................................................191.1.6字节同步映射.................................................................191.1.7浮动VC模式..................................................................191.3SDH的开销......................................................................221.3.1开销.......................................................................221.3.2指针.......................................................................321.4SDH网络结构和网络保护机理......................................................361.4.1基本的网络拓扑结构.........................................................361.4.2链网和自愈环...............................................................381.4.3复杂网络的拓扑结构及特点...................................................461.4.4SDH网络的整体层次结构......................................................481.5光接口类型和参数...............................................................511.5.1光纤的种类.................................................................511.5.2光接口类型.................................................................511.5.3光接口参数.................................................................521.6定时与同步.....................................................................541.6.1同步方式...................................................................551.6.2主从同步网中从时钟的工作模式...............................................561.6.3SDH的引入对网同步的要求....................................................561.6.4SDH网的同步方式............................................................571.1.8SDH网同步原则................................................................571.1.9SDH网元时钟源的种类..........................................................581.1.10SDH网络常见的定时方式........................................................581.6.5S1字节和SDH网络时钟保护倒换原理...........................................601.7传输性能与测试.................................................................631.7.1误码性能...................................................................641.7.2可用性...
