1.
railway telephone exchange
铁路专用电话交换机
2.
private automatic telephone exchange
专用自动电话交换机
3.
Each telephone served by a private branch exchange.
由专用小交换机提供服务的电话分机。
4.
time multiplex telephone exchange
时分多路电话交换机
5.
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。
6.
But it has existed in the proprietary realms of PBXes and heavy metal (mainframes or minisystems).
但它只是存在于用户电话交换机和笨重的铁家伙（大型机或小型机）的专有王国中。
7.
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。
8.
identifier circuit
(自动电话交换机的) 识别电路
9.
Code for design of railway SPC digital switching engineering
铁路时分数字程控电话交换工程设计规范
10.
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）。
11.
Relays for crossbar telephone switching systems
GB/T3972-1992纵横制电话交换机用继电器
12.
traffic control electrically-operated indicator for roads, railways, airfields
交通管理电动指示器,公路、铁路、机场用
13.
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
14.
SSPs are telephone switches, interconnected by SS7 links, that originate, terminate or tandem calls.
SSP 是由 SS7 链路互连的电话交换机，用来发起、终止或汇接呼叫。
15.
computer telephone exchange
电脑自动电话交换机
16.
common battery exchange
共电制电话交换机局
17.
electronically controlled telephone exchange
电子控制电话交换机
18.
semielectronic telephone switching system
半电子制电话交换机