ISDN用户-网络接口结构及实现

Structure and application of user-network interface in ISDN

ISDN的实现是当今通讯产业的重要课题．本文在阐述用户－网络接口结构的基础上，重点给出了2B＋D结构接口电路的实现方案．

At present, the application of ISDN is an important research project in the telecommunications industry. The structure of User-Network interface is expounded first.Then, in the most important part of this paper, the application circiut of 2B+D structure is explainded carefully.