电路交换公用数据网络  circuit switched public data network

分组交换公用数据网  Packet Switched Public Data Network PSPDN

公用数据交换网  Public Switched Data Network PSDN

电路交换数据网  circuit switched data network

电路交换数据网络  CSAcircuit switched data network

电路交换数据  CSD; agricultural competence

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

高速电路交换数据  HRhigh speed circuit switched data; high speed circuit switched data

高速电路交换数据服务  high speed circuit switched data service

高速电路交换数据业务  high speed circuit switched data

数据电路交换设备  data circuit switching equipment

数据电路交换系统  data circuit switching system; data circuit switch system

增强电路交换数据  enhanced circuit switched data

增强型电路交换数据  enhanced circuit-switched data (ECSD; ECSAenhanced circuit switched data

PSTN公用交换电话网  PSTN

电路交换公共数据网  Circuit-Switched Public Data Network CSPDN

分封交换式公用数据网络  packet switched public data network

公用交换电话网  PSTN; PSTN:PublicSwitchTelephoneNetwork; public switching telephone network; public switched telephone network

公用交换电话网络  public switched telephone networks; PSTN; public switched telephone network