The vertical and horizontal telephone exchanging system has been the common communication tools in railway system since 1950.
纵横制电话交换机是铁路系统五十年代乃至目前使用相当普遍的通讯设备，其性能已难以满足目前通信业务管理的需要。
crossbar private automatic branch exchange system
纵横制自动电话小交换机
crossbar automatic telephone system
纵横制自动电话交换机
concourse-connection longitudinal-transverse auto-telephone exchange
汇接用纵横制自动电话交换机
Relays for crossbar telephone switching systems
GB/T3972-1992纵横制电话交换机用继电器
crossbar automatic exchange system
纵横制自动交换方式
machine driven switching system
机动制自动电话交换机
selecting chain
(纵横制交换机中的)互斥电路
Technical requirements and testing methods for crossbar private automatic branch exchange
GB/T5322-1985纵横制用户电话交换机技术要求和试验方法
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
computer telephone exchange
电脑自动电话交换机
all relay automatic telephone system
全继电器制自动电话交换机
automatic local exchange
市内电话自动交换机
automatic toll switching system
长途电话自动交换机
unit automatic exchange
内部自动电话交换机
private automatic telephone exchange
专用自动电话交换机
code switch automatic telephone system
码条式自动电话交换机
"Present-day telephone-circuit switching equipment is based on either electromechanical techniques (employing crossbar, Strowger, or rotary switches)"
目前，电话的电路交换设备或以机电技术(采用纵横制、步进制或旋转式接线器)，
step-by-step system local automatic telephone exchange
步进制市内用自动电话交换机
