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社会经济和文化的发展,不断提升了对通信服务的要求。为了适应瞬息万变的电子时代,许多国家的电信部门和电子工业部门不断开拓了新技术和新服务,使得原有的网络不胜负荷。为解决这样的问题,诞生了新的一系列的业务网如传真网、用户电报网等等。然而,网络多,接口种类多,这对使用和经营管理带来了诸多不便。因此,一个能够提供多种综合业务的网络——ISDN出现了。ISDN的中文含义是综合业务数字信息网,它是一种先进的电信业务,其本质和我们熟悉的电话业务完全一样,都是由电信局负责开通、安装、调试的电信业务。那么
The socio-economic and cultural development has continuously raised the demand for communications services. In order to adapt to the ever-changing electronic age, the telecom and electronics industries in many countries have constantly opened up new technologies and services to overwhelm the existing network. In order to solve such a problem, a new series of business networks such as fax network, customer telegraph network and so on were born. However, there are many networks and many kinds of interfaces, which bring a lot of inconveniences to the use and management. Therefore, a network that can provide a variety of integrated services - ISDN appeared. ISDN Chinese meaning is Integrated Services Digital Information Network, which is an advanced telecommunications services, its essence and we are familiar with the telephone service exactly the same, are responsible for the opening, installation, commissioning by the Bureau of telecommunications services. Then