在交换系统中，同一或不同交换网络的引入线和引出线之间的连接部分或电路。
Within a switching system, a connection or circuit between inlets and outlets of the same or different switching networks.
模拟用户线接口电路是数字程控交换系统的重要组成部分。
Subscriber line interface circuit is an important part of digital program-controlled switching system.
本文叙述了一种适用于低速数字信道的地址编码时分交换系统的新的电路方案。
A new circuit scheme for the address coded TDM switching system of low speed digital channels is discussed in this paper.
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