目录1长株潭城际铁路应用SDH背景介绍.............................................................................................11.1设计背景介绍......................................................................................................................11.2长株潭城际铁路与SDH结合.............................................................................................11.3架构......................................................................................................................................22SDH详细介绍..................................................................................................................................32.1SDH的原理............................................................................................................................32.2SDH拓扑结构......................................................................................................................42.2.1链形网......................................................................................................................42.2.2星形网......................................................................................................................42.2.3树形网......................................................................................................................42.2.4环形网.....................................................................................................................42.2.5网孔形网..................................................................................................................42.3SDH技术的优点..................................................................................................................52.4SDH复用映射过程..............................................................................................................63长株潭城际铁路传输网基础拓扑设计........................................................................................93.1长株潭城际铁路线路图............................................................................................