| N | ||
| 1. | N | Newtons |
| 2. | N(r) | Receive Sequence Number |
| 3. | N(s) | Send Sequence Number |
| 4. | NA | Numerical aperture |
| 5. | NA | Network Aspects, North America |
| 6. | NA/WCPE | North American WCPE |
| 7. | NAB | National Association of Broadcasters |
| 8. | NACD | Network Automatic Call Distribution |
| 9. | NACK | Negative ACKnowledgment |
| 10. | NACLA | National Cooperation for Laboratory Accreditation |
| 11. | NADH | North American Digital Hierarchy |
| 12. | NAFTA | North American Free Trade Agreement |
| 13. | NAG | Network Reference Models, Acronyms & Definitions, & Guide to Standards Ad Hoc |
| 14. | NAI | Network Access Identifier |
| 15. | NAK | Negative Acknowledgment |
| 16. | NAK-NS | Negative Acknowledgment - Not Supported |
| 17. | NAK-NU | Negative Acknowledgment - Not Understood |
| 18. | NAL | Network Adaptation Layer |
| 19. | NAM | Number Assignment Module |
| 20. | NAMPS | Narrowband AMPS |
| 21. | NANC | North American Numbering Council |
| 22. | NANP | North American Numbering Plan |
| 23. | NANPA | North American Numbering Plan Administration (Administrator) |
| 24. | NAP | Network Access Point |
| 25. | NAR | Numbering, Addressing & Routing Committee of ETSI NA2 |
| 26. | NAS | Network Access Servers |
| 27. | NASA | National Aeronautics & Space Administration |
| 28. | NASC | Number Administration Service Center |
| 29. | NASDA | National Space Development Agency of Japan |
| 30. | NASNA | National Association of State 9-1-1 Administrators |
| 31. | NASRNG | Network Access Server Requirements |
| 32. | NAT | Network Address Translation |
| 33. | NATA | North American Telephone Association |
| 34. | NATO | North Atlantic Treaty Organization |
| 35. | NAVDEC | Network Access Server & Voice on IP Device Control |
| 36. | NB | Block Down converter |
| 37. | NBC | Non-backward Compatible |
| 38. | NBDG | New Business Development Group |
| 39. | NBR | New Business Release |
| 40. | NBS | National Bureau of Standards, Net Broadcast Service |
| 41. | NC | Network Codes, Network Channel, Network Computer |
| 42. | NCA | Non-Call Associated |
| 43. | NCAG | Network Commonality Ad Hoc Group |
| 44. | NCaps | Capabilities with No sub-fields |
| 45. | NCAS | Non-Call Associated Signaling |
| 46. | NCC | Network Color Code, Network Control Center |
| 47. | NCG | Number Consulting Group |
| 48. | NCI | Network Channel Interface, Non Coded Information |
| 49. | NCL | Networks Communications Laboratory |
| 50. | NCOS | Network class of service |
| 51. | NCP | Network Connection Point, Network Control Point, Network Control Program |
| 52. | NCRP | National Council of Radiation Protection & Measurement |
| 53. | NCS | Nurse Call System |
| 54. | NCSA | National Center for Supercomputing Applications, National Computer Security Association |
| 55. | NCTA | National Cable Television Association |
| 56. | NCTE | Network Circuit Terminating Equipment, Network Channel Terminating Equipment |
| 57. | ND | NSF Message data Indication |
| 58. | NDA | Non-Disclosure Agreement |
| 59. | NDC | National Destination Code |
| 60. | NDF | New Data Flag |
| 61. | NDIS | Network Driver (or Device) Interface Specification |
| 62. | NDS | Network Documentation System |
| 63. | NDSS | Network Directed System Selection |
| 64. | NE | Network Entity, Network Element |
| 65. | NEBS | Network Equipment Builder Standard, Network Equipment Building Systems |
| 66. | NEC | National Electric Code |
| 67. | NECQ | National Electronic Components Quality Assessment System |
| 68. | NEF | Network Element Function, Network Element Function block |
| 69. | NEFA | Near End Failure |
| 70. | NEI | Network Element Interface |
| 71. | NEL | Network Element Layer |
| 72. | NEMA | National Electrical Manufacturers Association |
| 73. | NENA | National Emergency Number Association |
| 74. | NEP | Network Equipment Provider |
| 75. | NES | Network Element Server |
| 76. | NET | Norme Europeenne de Telecommunication |
| 77. | NetBIOS | Network Basic Input Output System |
| 78. | NetPC | Net Personal Computer |
| 79. | NEW FORUM | Former COCOM |
| 80. | NEXT | Near End Cross Talk |
| 81. | NF | Noise Figure |
| 82. | NFAS | Non-Facilities-Associated Signaling |
| 83. | NFPA | National Fire Protection Agency |
| 84. | NGDLC | Next Generation Digital Loop Carrier |
| 85. | NGI | Next Generation Internet [aka Internet2] |
| 86. | NGN | Next Generation Network |
| 87. | NGOF | Next Generation Optical Fiber |
| 88. | NGSO | Non-Geostationary Satellite Orbit |
| 89. | NHR | Next Hop Resolution |
| 90. | NHRP | Next Hop Routing Protocol [allows routers to dynamically discover the data link address for other routers on a WAN cloud; particularly important for ATM, Frame Relay, SMDS and X.25 environments. Today it is necessary to configure the network layer and dat |
| 91. | NHRP | Next Hop Resolution Protocol, Next Hop Routing Protocol |
| 92. | NI | National ISDN, Network Element |
| 93. | NI-1 | National ISDN-1 |
| 94. | NI-2 | National ISDN-2 |
| 95. | NIA | Network Indicate Address |
| 96. | NIBS | National Institute for Building Standards |
| 97. | NIC | Network Independent Clocking, Network Information Center, Network Interface Card, National ISDN Council |
| 98. | NiCd | Nickel Cadmium |
| 99. | NID | Network Identification, Network Interface Device, Network Interface or Demarcation, Node ID |
| 100. | NIDAB | Narrow Band Digital Broadcasting |
| 101. | NII | National Information Infrastructure |
| 102. | NIM | Network interface module |
| 103. | NiMH | Nickel Metal Hydride |
| 104. | NIO | Network Input Output |
| 105. | NIP | Number Identification Presentation |
| 106. | NIS | Network Information Service |
| 107. | NISDN | National ISDN |
| 108. | N-ISDN | Narrowband ISDN |
| 109. | NISP | Network Inventory & Service Provisioning |
| 110. | NIST | National Institute for Standard s and Technology |
| 111 | NIU | Network Interface Unit |
| 112. | NIU | Network Interface Unit |
| 113. | NIUF | National ISDN Users Forum, North American ISDN Users Forum |
| 114. | NLC | Node Line Card |
| 115. | NLD | Non-Linear Distortion |
| 116. | N-LLC | Narrowband Logical Link Control |
| 117. | NLM | Network Loadable Module |
| 118. | NLP | Network Layer Protocol , Non-Linear Processor |
| 119. | NLPID | Network Layer Protocol ID |
| 120. | NLS | Native Language Support |
| 121. | nm | Nanometer |
| 122. | NM | Network Management |
| 123. | NMA | Network Management & Administration, Network Monitoring & Analysis |
| 124. | NMAG | Network Management Ad hoc Group |
| 125. | NMAS | Network Management System |
| 126. | NMC | Network Management Center, Network Model Coverage |
| 127. | NMCS | NMC System |
| 128. | NME | Network Management Entity |
| 129. | NMF | Network Management Forum |
| 130. | NML | Network Management Layer |
| 131. | NMM | Network Map Management |
| 132. | NMO | NM Option, NetMetrix Operation |
| 133. | NMP | Network Management Protocol |
| 134. | NMS | Network Management System |
| 135. | NMSI | National Mobile Station Identification |
| 136. | NMT | Nordic Mobile Telephone |
| 137. | NMX | Normas Mexicanas (non-mandatory Mexican standard) |
| 138. | NNI | Network-to-Network Interface |
| 139. | NNM | Network Node Manager |
| 140. | NNTP | Network News Transfer Protocol |
| 141. | NO PROBLEM | NOn PROprietary reliaBLe Electronic Mail |
| 142. | NOC | Network Operations Center |
| 143. | NOF | Network Operations Forum |
| 144. | NOI | Notice of Inquiry |
| 145. | NOM | Mexican National Standards |
| 146. | NOS | Network Operating System |
| 147. | NOTE | Network Office Terminating Equipment |
| 148. | NP | Network provider |
| 149. | NP | Non-Public, Number Portability |
| 150. | NPA | Network Planning Area , Network Provider Access, Numbering Plan Area |
| 151. | NPAC | Number Portability Administration Center |
| 152. | NPC | Network Parameter Control |
| 153. | N-PCS | Narrowband PCS |
| 154. | NPDB | Number Portability Database |
| 155. | NPI | Numbering Plan Indicator |
| 156. | NPID | Network Provider Identification |
| 157. | NPR | Noise Power Ratio |
| 158. | NPRM | Notice of Proposed Rule Making |
| 159. | NPRP | Number Portability Routing Protocol |
| 160. | NPS | Network Planning System |
| 161. | NPSI | Network Packet Switching Interface |
| 162. | NPV | Net Present Value |
| 163. | NR | Nordstrom-Robinson |
| 164. | NRC | Negotiated Rulemaking Committee, Network Reliability Council |
| 165. | NRM | Network Reference Model, |
| 166. | NRP | Node Route Processor |
| 167. | NRR | Network Restoration Ratio |
| 168. | NRTL | Nationally Recognized Test Laboratory |
| 169. | NRZ | Non-Return to Zero |
| 167. | NRZI | Non-Return to Zero on Ones |
| 168. | NS | Network Systems |
| 169. | NS/EP | National Security & Emergency Preparedness |
| 170. | NSA | Non-Service-Affecting, Network Systems Architecture lab, National Security Agency |
| 171. | NSAM | Network, System and Application Management |
| 172. | NSAP | Network Service Access Point |
| 173. | NSB | National Standardization Body |
| 174. | NSC | Non-Standard Facilities Command, Network Service Center |
| 175. | NS-cap | Non-Standard capability |
| 176. | NSFNET | National Science Foundation NETwork |
| 177. | NSI | Network Service Interface |
| 178. | NSIE | Network Security Information Exchange |
| 179. | NSM | Network Status Monitor, Networked Systems Management, Network Service Module |
| 180. | NSMA | National Spectrum Managers Association |
| 181. | NSMD | Network and Systems Management Division |
| 182. | NSN | Network Services Node |
| 183. | NSO | National Standard Organization |
| 184. | NSP | Network Services Part, National Signaling Point, Node Switch Processor |
| 185. | NSS | Network (and switching) Sub-System, Non-Standard Setup |
| 186. | NSTAC | National Security Telecommunications Advisory Committee |
| 187. | NSTC | National Science and Technology Center |
| 189. | NT | Network Termination |
| 190. | NTCA | National Telephone Cooperative Association |
| 191. | NTE | Network Terminating Equipment |
| 192. | NTIA | National Telecommunications & Information Administration |
| 193. | NTP | Network Termination Point, Network Transaction Processors, Network Time Protocol |
| 194. | NTQ | Near Toll Quality |
| 195. | NTR | Network Timing Reference marker |
| 196. | NTRAC | New Technical Recommendation Application Committee |
| 197. | NTSC | National Television Standards Committee, National Television System Committee |
| 198. | NTT | Nippon Telegraph and Telephone Corporation |
| 199. | NTTC | National Technology Transfer Center |
| 200. | NUI | Network User Identification |
| 201. | NVCASE | National Voluntary Conformity Assessment System Evaluation |
| 202. | NVLAP | National Voluntary Laboratory Accreditation Program |
| 203. | NVoD | Near Video on Demand |
| 204. | NVRAM | Non-Volatile RAM |
| 205. | NWK | Network, Layer 3 of the WCPE protocol stack |
| 206. | NYCE | Certification Body accredited by SECOFI (Mexico) |
| 207. | NYIIX | New York International Internet Exchange |