分组交换网 CHINAPAC ; PSPDN ; PSN

包交换网络 packet switched network ; [计] packet switching network ; packet network ; PSN

公共包交换网络 Public Packet Switched Network

公共交换网 public switching network

分组交换网络 Packet Switched Network ; PSN ; [计] packet switching network ; Packet Switching

中国公用分组交换网 CHINAPAC

公共电话交换网 public switched telephone network

电文交换网络 message switching network

电路交换网 Circuit-switched network ; [通信] circuit switching network