【摘要】 概述了北京本地ＳＤＨ传输网络的现状，对分层式网络结构和环网络结构及其适用条件作了介绍，并从实用的角度对如何组织ＳＤＨ网络进行了分析。从实际出发对北京本地传输网络的发展和原有网络的优化提出了建议和设想。更多还原

【Abstract】 This article gives an overview of status quo of the Beijing local SDH transmission networks, describes the hierarchical network structure, ring network structure and their applicable conditions and analyses the way to organize the SDH net- work from a practical point of view. It also puts forward proposals and considerations on the de- velopment of the Beijing local transmission net- works and the optimization of the existing networks based on actual conditions.更多还原