电路或线路交换
circuit or line switching
switching, circuit or line
circuit or line
switching
时间分开线路交换
TDCS Time Division Circuit Switching
线路交换电源供应器
line switching power supplies
线路交换公众数据网络
Circuit-switched Public Data Network
线路交换集中器
line switching concentrator
线路交换控制器
line switching controller
外来交换机线路
FXC Foreign eXchange Circuit