NTN Network Terminal Number
integrated national network
integrated national telecommunication system
National Network Congestion
NNC National Network Congestion
NNC National Network Congestion signal
NNSC National Network Service Center
NTA National Telecommunication Agency
NTIA National Telecommunication Industry Administration
railway of national network
(INMS)integration telecommunication network management system
aeronautical fixed telecommunication network
aeronautical telecommunication network
automatic fixed telecommunication network
data telecommunication network
electric power dispatching telecommunication network
electric power private telecommunication network