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引言数字传输网就其基本设备或基本技术而言,可分为数字传输、数字复接和数字交换三部分。目前,国际上数字传输在工程上已经广泛应用,数字复接研究渐趋完善并开始工程应用,而数字交换基本上处于研究阶段。这与数字传输网的发展过程是一致的:简单的点间传输,只要有数字传输设备就可以了,传输路径出现分支,就需要数字复接设备;而形成网络
Introduction Digital transmission network for its basic equipment or basic technology, can be divided into digital transmission, digital multiplexing and digital exchange of three parts. At present, the digital transmission in the world has been widely applied in engineering. The research of digital multiplex connection has been gradually improved and started to be applied in engineering. The digital exchange is basically in the research phase. This is consistent with the development of digital transmission networks: simple point-to-point transmission, as long as digital transmission equipment on it, the transmission path of the branch, you need digital multiplexing equipment; and the formation of the network