private telephone exchange

railway telephone exchange

铁路专用电话交换机

A private telephone exchange that automatically connects internal "branch" lines to the external circuits of a telephone system.

一种自动地将内部用户线连接到电话系统外线的专用电话交换机。

private automatic telephone exchange

专用自动电话交换机

Each telephone served by a private branch exchange.

由专用小交换机提供服务的电话分机。

If not, the call went to the company's in-house telephone switching system, or PBX (private branch exchange).

如果没有，电话就转到公司内的电话交换系统（即PBX，用户电话交换机）。

Relays for crossbar telephone switching systems

GB/T3972-1992纵横制电话交换机用继电器

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

computer telephone exchange

电脑自动电话交换机

common battery exchange

共电制电话交换机局

electronically controlled telephone exchange

电子控制电话交换机

semielectronic telephone switching system

半电子制电话交换机

Such a switch replaces dedicated circuit-switching hardware with IP switching technology

这样的交换机是利用IP交换技术代替专用的电路交换硬件。

machine driven switching system

机动制自动电话交换机

Intranet Telephony: Will your LAN Replace Your PBX?

内部网电话：局域网会替代用户电话交换机吗？

Intranet Telephony: Will your LAN Replace Your PBX? (2)

内部网电话：局域网会替代用户电话交换机吗？（2）

step-by-step system local automatic telephone exchange

步进制市内用自动电话交换机

concourse-connection longitudinal-transverse auto-telephone exchange

汇接用纵横制自动电话交换机

What functions does the mobile phone exchange have7

移动电话交换机起什么作用?