随着新的一代器件,尤其是数字集成电路的出现,有力地促进了数字通信的发展,建立以数据交换,电话、电报,传真和电视为中心的专用通信网和通用通信网也已为时不远。本文仅闸述了国内民用增量调制系列通信网的网模型以及建立通信网时应注意的几个问题。 With the advent of a new generation of devices, especially digital integrated circuits, which have strongly promoted the development of digital communications, it has also been time to establish private and public communications networks centered on data exchange, telephone, telegraph, facsimile and television Not far. This article only describes the network model of domestic civil incremental modulation series communication network and some problems that should be noticed when establishing communication network.