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?