telephone exchanges

Interconnection test of different telephone exchanges for electric power dispatching

程控调度交换机互联互通测试

How to handle common faults in crossbar system automatic telephone exchanges

纵横制电话交换机常见故障处理方法

The PTC Ceramics Used in Telephone Exchanges and Their Characteristics

程控交换机用的PTC限流器材料及其特性

In the early1970s , the majority of telephone exchanges were still electromechanical analog switches .

在70年代早期，大多数电话交换机还是机电模拟转换器。

This percentage is obtained by dividing the number of main lines connected to digital telephone exchanges by the total number of main lines .

这个百分比通过连接到数字电话交换机的主线数除以主线总数得到。

SPC exchanges have accounted for99.8 % of the country central office telephone exchanges and99.6 % of long distance transmission has been digitized .

全国局用交换机程控化比重达到99.8%，长途传输数字化比重达到99.6%；

At the same time , system-specific calls pop-up window function facilitates patients counsel station information through telephone and exchanges platform under specific circumstances .

同时系统特有的来电弹屏功能，方便患者通过电话咨询台位信息及在特定情况下调换台位。

Call or clear indicator for telephone switch-boards and exchanges

呼叫或拆线指示器，电话交换台和交换机用的

A telephone line connecting two exchanges directly .

直接联系两个交换器的电话线。

To ensure that any users of the telephone network can communication with all other users , it is necessary to rely on the telephone switchboard . The use of telephone exchanges , each phone will need a pair of transmission lines to connect to the switches .

要保证任何用户都能对电话网内所有其他用户建立电话通信，就要依靠电话交换机为每一个用户建立呼叫连接，采用电话交换机后，每一部电话都需要一对传输线与交换机连接。