光同步数字体系的研究与分析.docVIP

摘 要 现代社会通信日益发达，对传输网络的要求越来越高，同步数字体系SDH作为准同步数字体系PDH的替代品而出现，并且不断更新完善以适应市场需求，成为当今光纤传输体系的主流。到目前为止，还没有出现可完全替代SDH的新技术，有的只是现有SDH技术的发展和补充，这也证明了SDH强大的生命力。 鉴于SDH广泛的应用及未来良好的发展潜力，众多学者展开对SDH的研究，同时也为SDH的发展提供了强劲的动力。本次研究主要是了解SDH相关知识，并无高精尖技术方面的研究。论文主要从SDH的产生背景、工作原理出发，介绍了SDH的产生、特点以及未来发展（包括多业务传送平台MSTP和IP Over SDH技术），SDH帧结构，SDH映射、定位及复用，SDH同步与定时，SDH网络结构、网络管理以及网络保护与恢复，并结合应用实例进行讲解，最后介绍了部分SDH系统测试内容。 关键词：PDH，同步复用，SDH，MSTP,IP over SDH ABSTRACT Nowadays telecommunication is developing fast, theres higher and higher demand for transmission network. SDH (Synchronous Digital Hierarchy), as a substitute of PDH (Plesiochronous Digital Hierarchy), keeping update to meet the market demand, has become the mainstream optical transmission system. So far, there is no alternative to SDH technology, only the extensions of SDH technology. This also proves SDH has strong vitality. Because of the wide range of SDH applications and good potential on future development, many scholars research on SDH, meantime this provide the development of SDH a strong driving force. This study is to understand basic knowledge of SDH, there is no high-technology research. This paper introduced the generation of SDH, characteristics of SDH and SDHs future development (including the Multi-Service Transport Platform and IP Over SDH technology), SDH frame structure, SDH mapping, positioning and multiplexing, SDH synchronization and timing, SDH network architecture, network management and network protection and recovery, combined with the application of examples to explain, and at last introduced some of the contents of the test SDH system. Keywords: PDH, Synchronous Multiplexing, SDH, MSTP, IP over SDH 目 录 第1章 SDH概述 1 1.1 SDH的产生背景 1 1.2 SDH的基本概念 1 1.3 SDH的特点 2 1.4 SDH与PDH的比较 3 1.4.1 PDH的技术特点 3 1.4.2 PDH存在的问题 4 1.5 SDH的应用发展 5 第2章 SDH传输原理 5 2.1 基本传输单元SDH帧 6 2.2 传输中的复用与映射 7 2.2.1 基本复用单元 7 2.2.2 SDH的复用 9 2.2.3 SDH的映射与定位 10 2.3 传输数据速率 11 第3章 SDH的网络 13 3.1 SDH的网络结构 13 3.1.1 SDH传输网基本物理拓扑结构 13 3.1.2 我国SDH传送网结构 13 3.1.3 SDH网元 14 3.