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通过电话线路复用器能在一条用户线上同时传输多路电话，作者基于ＩＳＤＮ的Ｕ接口技术实现了数字复用器，在文中重点介绍了其硬件与软件的实现
Through the telephone line multiplexer can transmit multiple telephone at the same time in a subscriber line, the author realizes the digital multiplexer based on ISDN U interface technology, and mainly introduces the hardware and software implementation