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详细介绍了ISDN（2B＋D）第一类用户／网络终端设备（NT1）的基本特性、主要功能、完整结构等，同时还提出了NT1的实现方法和供电系统的设计。
The basic characteristics, main functions and complete structure of the first type of user / network terminal equipment (NT1) of ISDN (2B + D) are introduced in detail. At the same time, the realization method of NT1 and the design of power supply system are also proposed.