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介绍了窄带综合业务数字网（Ｎ－ＩＳＤＮ）的业务特点及种类，对天津市建设Ｎ－ＩＳＤＮ的必要性、Ｎ－ＩＳＤＮ的网络结构和基本配置等有关建设方案和其他一些问题进行了初步的探讨。
Introduced the business characteristics and types of Narrowband Integrated Services Digital Network (N-ISDN), carried out the related construction schemes and other issues concerning the necessity of constructing N-IS-DN in Tianjin, the network structure and basic configuration of N-ISDN Preliminary discussion.