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１．３．３ 综合业务数字网（ＩＳＤＮ）综合业务数字网ＩＳＤＮ，通常是以综合数字电话网（ＩＤＮ：采用数字传输与数字交换综合而成的电话网）为基础发展演变而成的通信网，能够提供端到端的数字链接，用来支持包括话音和非话业务在内的多种电信业务，用户能够通过有限的一
1.3.3 Integrated Services Digital Network (ISDN) The Integrated Services Digital Network ISDN, which is typically a communications network based on the evolution of an integrated digital telephone network (IDN: a telephone network that is a combination of digital transmission and digital switching) , Can provide end-to-end digital link to support a variety of telecommunications services, including voice and non-voice services, users can pass a limited one