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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.
The realization of ISDN is an important issue in today’s communications industry. This paper elaborates the structure of user-network interface, based on which the realization of 2B + D structure interface circuit is given.