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介绍了一种新的数字网—综合业务数字网（ＩＳＤ）的特点、优点和用途。给出了 一个利用综合业务数字网进行局域网互联的实例。
Describes the features, benefits, and uses of a new digital network, the Integrated Services Digital Network (ISD). An example of LAN interconnection using integrated services digital network is given.