带交换功能数字用户集中器的设计与实现

Design and Implementation of the Digital Concentrator with Exchanging Function

文章简述了一种新型的线路集中器，这种集中器具有程控交换功能，采用灵活的存储程序控制，具有呼叫转移、遇忙回叫、电话会议、优先等多种服务功能，还具有故障诊断告警显示等功能。

This paper describes a new line concentrator. The concentrator is with program-controlled exchanging function. By way of flexible programmed-control, it has so many services as call-transfer, busy-recall, telephone-conference, priority, and so on. It also has breakdown diagnosis, alarm and display functions.