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