SDH is made from SDH network unit. Its basement of transmission technology is frame structure whose net functions include normal management, trouble management and property management and so on.
SDH由SDH网络单元组成，其传输技术基础是帧结构，其网络功能包括一般性管理、故障管理、性能管理、配置管理、安全管理。
To build nationwide synchronized time net using SDH network, we must study the time delay in SDH network transmission path.
利用SDH网络组建全国的时间同步网，需要研究s DH网络传递路径的时延和时延误差。
This paper introduces superiority of ATM and SDH wideband transmission system. It discusses advantage of ATM and SDH, and ATM /SDH wideband information network.
论述ATM技术在SDH上实现宽带传输，讨论了ATM技术和SDH技术的优点，以及ATM／SDH技术建立宽带信息网的方案及其优势。
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