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论述了综合业务数字网（ＩＳＤＮ）及其标准用户──网络接口的基本概念；对用户网络接口的体系结构作了较为详细的说明，给出了具体的软件实现方法和硬件接口电路（ＳＮＩＣ）．在此基础上，提出了ＩＳＤＮ标准数字话音终端和基于基本接入能力（２Ｂ＋Ｄ）的多功能数字终端的设计方案。
The basic concepts of Integrated Services Digital Network (ISDN) and its standard user ─ ─ network interface are discussed. The architecture of user network interface is described in detail. The specific software implementation method and hardware interface circuit (SNIC) . On this basis, the design scheme of ISDN standard digital voice terminal and multi-function digital terminal based on basic access capability (2B + D) is proposed.