| NA |
Network Aspects |
| NAB |
National Association of Broadcasters |
| NAK |
Negative AcKnowledgement |
| NASA |
National Aeronautics and Space Administration |
| NAT |
Network Access Terminal |
| NB |
Narrowband |
| NCC |
Network Control Centre |
| NCF |
Network Control Facility |
| NCR |
Non-Conformance Report |
| NCS |
Network Coordination Station |
| NCTA |
National Cable Television Association |
| NCTS |
Non-Conformance Tracking System |
| NEO |
Near Earth Object |
| NEP |
Nuclear Electric Propulsion |
| NF |
Noise Figure |
| NGSO |
Non Geostationary Orbit |
| NIC |
Near Instantaneous Companding |
| NiCd |
Nickel Cadmium |
| NiH |
Nickel Hydrogen |
| NIM |
Network Interface Module |
| NMC |
Network Management Centre |
| NMS |
Network Management System |
| NOAA |
National Oceanic and Atmospheric Administration |
| NOC |
Network Operations Centre |
| NORAD |
North American Aerospace Defence |
| NOTAM |
Notice to Airmen |
| NPR |
Noise/Power Ratio |
| NRTC |
National Rural Telecommunications Cooperative |
| NRZ |
Non Return to Zero |
| ns |
Nanosecond |
| NSC |
National Switching Centre |
| NSS |
Network Switching System |
| NSSL |
National Security Space Launch |
| NTN |
Non Terrestrial Network |
| NTO |
Dinitrogen Tetroxide |
| NTP |
Network Time Protocol |
| NTP |
Nuclear Thermal Propulsion |
| NTSC |
National Television Standards Committee (TV standard) |
| NVOD |
Near Video On Demand |
