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本篇介绍了数字传输体系由ＰＤＨ向ＳＤＨ发展的趋势以及ＳＤＨ概念和特点，同时也描述了ＳＤＨ的各种网络结构以及先进的网络保护措施和网络同步系统，最后根据广西的具体情况，提出组建广西ＳＤＨ网的设想。
This article introduces the trend of digital transmission system from PDH to SDH and the concept and characteristics of SDH. It also describes various network structures of SDH as well as advanced network protection measures and network synchronization system. Finally, according to the specific situation in Guangxi, Vision of Guangxi SDH Network.