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介绍四川省ＳＤＨ干线网建设工程中引进的各种ＳＤＨ设备的性能、特点和组网功能，并就网路结构与主要系统指标、光中继距离等工程设计问题进行了论述。（ｅｄ）
This paper introduces the performance, features and networking functions of various SDH equipment introduced in the construction of SDH trunk network in Sichuan Province and discusses the engineering design issues such as the network structure, major system indexes and optical relay distance. (Ed)