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同步数字传输系统（ＳＤＨ）技术先进，组网能力强，标准化程度高，维护管理方便，对未来发展具有适应性。文章在介绍了ＳＤＨ同步数字传输系统的产生和特点的基础上，介绍了ＳＤＨ传送网的结构、复用原理及与ＰＤＨ的互通
Synchronous Digital Transmission System (SDH) has advanced technology, strong networking capability, high standardization, convenient maintenance and management, and adaptability to future development. Based on the introduction of the generation and characteristics of SDH synchronous digital transmission system, the article introduces the structure of SDH transport network, multiplexing principle and interworking with PDH