local (urban) telephone switching system

Technical requirements and testing methods for local crossbar telephone switching systems

GB/T6878-1986纵横制市内电话交换机技术要求和试验方法

automatic local exchange

市内电话自动交换机

step-by-step system local automatic telephone exchange

步进制市内用自动电话交换机

unit automatic exchange

内部自动电话交换机

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）。

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）

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

machine driven switching system

机动制自动电话交换机

automatic toll switching system

长途电话自动交换机

ESSEX (Experimental Solid State Exchange)

实验固体电话交换机

crossbar automatic telephone system

纵横制自动电话交换机

private automatic telephone exchange

专用自动电话交换机

time multiplex telephone exchange

时分多路电话交换机

railway telephone exchange

铁路专用电话交换机