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IsDN全称INTEGRATED SERVICE DIGITAL NETWORK,它是在70年代末期由美国贝尔实验室提出。其用意是要在现有数字化电信交换网中建立一个可提供多种通信业务的综合网络——综合业务数字网。 随着计算机网络技术及应用的迅速发展,ISDN各类终端的互通性操作性的加强及价格的下降;尤其是INTERNET被广泛的应用,使西方许多国家的ISDN需求大大提高,ISDN的网络迅速发展扩大。从1992年开始,世界上一些主要通信发达国家中的ISDN进入迅猛
IsDN full name INTEGRATED SERVICE DIGITAL NETWORK, it was made in the late 70’s by the United States Bell Labs. The intention is to create an integrated network of integrated services that provides a wide range of communications services in existing digital telecommunications networks. With the rapid development of computer network technologies and applications, the interoperability of ISDN terminals is enhanced and the price is reduced. In particular, the wide application of INTERNET has greatly increased the ISDN requirements of many western countries and the rapid development of ISDN networks expand. Since 1992, the ISDN in some major developed countries in the world has rapidly entered the ISDN