PNNI Private Network-Network Interface
Private Network-Network Interface (PNNI)
private telephone network
GSTN General Switched Telephone Network
PSTN Public switched telephone network
public switched telephone network
电话公网
电话网
公用电话网络
公用电话网
公共电话交换网
公用交换电话网
固定电话网络
公共交换电话网路
公用交换电话网络
public switched telephone network {= PSTN}
switched telephone network
APD avalanche photodiodeanalog private network signaling system
APIanalog private network signaling system
APManalog private network signaling system
communication private network
distributed virtual private network
DPCMdigital private network signaling system
DPLLdigital private network signaling system
enterprise’s virtual private network
Government Private Network