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本文主要介绍了综合通信网络的发展过程及其各个阶段的主要原理，重点阐述了Ｂ—ＩＳＤＮ的核心技术，为ＡＴＭ网络广泛应用提供了可靠的理论基础。
This article mainly introduces the development process of integrated communication network and the main principles of each phase. The core technologies of B-ISDN are mainly described, which provides a reliable theoretical basis for the extensive application of ATM network.