电路群拥塞信号
Circuit Group Congestion Signal CGC
B信道电路交换
B channel circuit switched
串接交换交换
tandem switching exchange
电路交换操作
circuit switching operation
电路交换的交换局
circuit switching exchange
电路交换公共数据网
Circuit-Switched Public Data Network CSPDN
电路交换公用数据网络
circuit switched public data network
电路交换连接
circuit switch connection
circuit-switched connection
电路交换数据传输服务
circuit switch data transmission service
circait-switched data-transmission service
circuit-switched data-transmission service
电路交换数据网
circuit switched data network
电路交换数据网络
CSAcircuit switched data network