NAFTA North American Free Trade Agreement NAK Negative Acknowledgment NAP Network Access Point NAPT Network Address Port Translation NAS Network Access Server NASA National Aeronautics and Space Administration NAT Network Address Translation NATA North American Telecommunications Association NAUN Next Active Upstream Neighbour (Token Ring) NBS National Bureau of Standards NBTel New Brunswick Telephone Company NCB National Certification Bodies NCC Network Control Center NCC New Common Carrier NCIH North Carolina Information Highway NCP Network Control Point NCP Network Control Processor (Ardis) NCP Network Control Protocol NCTA National Cable Television Association NE Network Element NEC National Electric Code NECA National Exchange Carrier Association NetBIOS Network Basic Input/Output System NEXT Near End CROSS-Talk NFOEC National Fiber-Optic Engineering Conference NFPA National Fire Protection Association NFS Network File System protocol NGBT Negotiating Group on Basic Telecommunications NGDLC Next-Generation Digital Loop Carrier NGN Next Generation Network NGSO Non-GeoStationary Orbit NIC Network Interface Card (LANs) NII National Information Infrastructure N-ISBN Narrowband ISBN NIST National Institute of Science/Standards and Technology (USA) NIU Network Interface Unit NMC Network Management Center NMF Network Management Forum NML Network Management Layer NMS Network Management System NMS Network Management Station (SNMP) NMT Nordic Mobile Telephone NNI Network-Network Interface (ATM) NNTP Network News Transfer Protocol NORAD North American Aerospace Defence Command NOS Network Operating System NPRM Notice for Proposed Rule Making NRC Network Reliability Council NREN National Research and Engineering Network NRM Negotiated Rule Making NRM Normal Response Mode NRTL Nationally Recognized Testing Laboratory NRZ Non Return to Zero NS Name Server (DNS) NSA National Security Agency (USA) NSAP Network Service Access Point (ATM) NSF National Science Foundation NSFNet National Science Foundation Network NSM Network Status Monitoring NT Network Termination NTT Nippon Telegraph and Telephone Corporation NTU Network Terminating Unit NVOD Near Video on Demand NZDS Non Zero Dispersion Shifted (ITU-T G.655)