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介绍了光缆通信网络可靠性与有效性的基本概念及为提高可靠性采用的标准保护网络，对保护网络的核心问题———网络主备保护切换功能、技术参数、保护信道协议以及性能参数的测量方法等进行了重点的论述。指出，由于ＳＤＨ体系结构的不同，决定了主备保护切换系统有统一的标准，与ＰＤＨ系统相比，不但可靠性高，而且因信道的冗余，为网络智能化创造了条件。
This paper introduces the basic concepts of reliability and validity of optical fiber communication network and the standard protection network which is used to improve the reliability. The key problems of the protection network --- the switching function of main and backup protection, technical parameters, protection channel protocol and performance parameters Measurement methods were discussed. It is pointed out that due to the difference of SDH architecture, it is decided that the main and backup protection switching system has a uniform standard. Compared with the PDH system, it not only has high reliability but also creates the conditions for the network intelligence due to the redundancy of the channel.