公用交换电话网
PSTN
PSTN:PublicSwitchTelephoneNetwork
public switching telephone network
public switched telephone network
公用电话网络
public switched telephone network
public telephone network
公众交换电话网络
public switched telephone network {= PSTN
public switch telephone network
分封交换电话网络
packet switching telephone network
交换电话网络
switched telephone network
公共电话交换网
PSTN Public switched telephone network
public switched telephone network
PSTN
公共交换电话网
public switched telephone networks
PSTN
公共交换电话网路
PSTN
public switched telephone network
公用电话网
PSTN
public phone network
public switched telephone network
public telephone network
beam-shaping