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主要论述了综合业务数字网（ＩＳＤＮ）的概念及特点，简要介绍了ＩＳＤＮ发展的目标———宽带综合业务数字网（Ｂ＿ＩＳＤＮ）及其实现的技术基础。
Mainly discusses the concept and characteristics of Integrated Services Digital Network (ISDN), briefly introduces the target of ISDN development --- Broadband Integrated Services Digital Network (B_ISDN) and the technical foundation of its realization.