Subscriber line interface circuit is an important part of digital program-controlled switching system.
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。
This paper reports a multi-feature stored program controlled (SPC) switching system which has voice and data exchange feature and multi-interface.
本文介绍一种具有话音和数据交换功能且具有多种用户接口的多功能交换系统。
应用推荐