telephone exchanges

Over the connectionless IP network, the SIP-based VoIP system provides VoIP services with software exchanges, performing both fixed and mobile telephone switching and transmission functions, only showing differ-ence at access modes.

在无连接的IP网上，基于SIP的VoIP系统用软件交换机提供VoIP业务，既可完成固定电话的交换传输，也可完成移动电话的交换传输，差别仅仅是接入方式不同。

a range of dehydrator products is available as a fixed installation in telephone exchanges maintaining cable health.

干燥机系列产品对电话线缆进行脱水干燥，保证线路正常使用。

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

total capacity of urban and rural telephone exchanges (line)

三、城乡电话交换机总容量（门）

total capacity of urban telephone exchanges

市话交换机总容量

of course, once the two sides met, and then telephone exchanges to be much more convenient.

当然一旦双方见过面，再用电话往来就方便多了。

...plans to route every emergency call in Britain through just three telephone exchanges.

只通过3次电话转接来传送英国境内所有紧急呼叫的计划

interconnection test of different telephone exchanges for electric power dispatching

程控调度交换机互联互通测试

The principle, characters and realization method of long distance automatic connection between two subscriber's exchanges with loop carrier telephone terminal are presented.

提出了两台用户交换机之间通过环路载波机进行远距离自动转接的方案，并给出其原理、特点和实现方法。

in 2004 , the capacity of telephone exchanges includes local telephone exchanges.

2004年固定电话交换机容量含小灵通交换机。

kpn has replaced 1, 300 telephone exchanges with just 100 ip centres, and raised euro 1 billion by selling property as it did so.

KPN仅仅用了100部IP中枢就取代了1,300门电话交换机，而且通过出售那些财产筹集了10亿欧元。

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。

electronic technology enables telephone exchanges to cover an ever increasing number of telephone communications .

电子技术使得电话交换机可以处理大批量的电话用户。

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。

capacity of local telephone exchanges (unit)

市内电话交换机总容量（门）

plan of time automatic synchronization of spc telephone exchanges in tianjin local networks

天津本地网程控电话交换机时间自动同步方案

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