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。
SDH transmission network is a complicated network system, the attendant should accumulate experience and steadily improve fault treatment ability for keeping the network to running normally.
SDH传输网络是一个复杂的网络系统，维护人员必须在实践中不断积累经验，提高网络故障的处理能力。
Associated with the expansion of network, the optimization scheme of transmission net - work is proposed to solve the dispatching of service across the different SDH ring.
介绍了城域传输网络的现状，并对sdh环叠加和环相套的扩容方案存在的问题进行了讨论。
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