Telecommunications terms starting with N

258 terms

  1. Nonconforming End Office Office that is not yet equipped or incapable of being equipped, for provision of originating and terminating Feature Group D LATA access service.
  2. noncooperative remote rekeying Synonym automatic remote rekeying.
  3. noncritical technical load Of the total technical load at a facility during normal operation, the part that is not required for synchronous operation.
  4. nonerasable storage Synonym read-only memory.
  5. nonlinear distortion Distortion caused by a deviation from a linear relationship between specified input and output parameters of a system or component.
  6. nonlinear scattering Direct conversion of a photon from one wavelength to one or more other wavelengths.
  7. nonloaded twisted pair A twisted pair that has no intentionally added inductance.
  8. nonoperational load Administrative, support, and housing power requirements. Synonym utility load.
  9. nonrepudiation 1. The capability, in security systems, that guarantees that a message or data can be proven to have originated from a specific person. 2.
  10. nonresonant antenna Synonym aperiodic antenna.
  11. nonsecret encryption Synonym public key cryptography.
  12. nonshifted fiber Synonym dispersion-unshifted fiber.
  13. nonsynchronous data transmission channel A data transmission channel in which separate timing information is not transferred between the data terminal equipment (DTE) and the data circuit…
  14. nonsynchronous network Synonym asynchronous network.
  15. nonsynchronous system See asynchronous transmission.
  16. Nonsynchronous Test Line The term "Nonsynchronous Test Line" denotes an arrangement in step-by-step end offices which provides operational tests which are not as complete as those…
  17. nonsynchronous transmission See asynchronous transmission.
  18. nontechnical load Of the total operational load at a facility during normal operation, the part used for support purposes, such as general lighting, heating…
  19. nontransparent mode A mode of operating a data transmission system in which control characters are treated and interpreted as such, rather than simply as data or text bits in…
  20. NORM state A state that exists on a permanent virtual circuit connection when there are no alarm conditions on either the originating or terminating endpoints.
  21. normal mode (application layer) The mode of ACSE (association control service element) operation that results in the transfer of ACSE semantics, using the presentation service. [T1.
  22. normal mode (presentation layer) The mode of operation of the Presentation Layer, which provides the full facilities of the presentation service. [T1.208-1989]
  23. normal resolution still image A still image transmitted in the ANSI Tl.314 video stream encoded to the same resolution as the previous motion video (i.e.
  24. normal routing The routing of a given signaling traffic stream under normal conditions (in the absence of failures). [T1.226-1992]
  25. normal/alarm (N/A) state bit A bit used in signaling packets to transfer information on alarm status across a permanent virtual circuit in the direction of transmission from the…
  26. normalized frequency (V) In an optical fiber, a dimensionless quantity, V, given by where a is the core radius, λ is the wavelength in vacuum, n1 is the maximum refractive index…
  27. North American Number Plan (NANP) A plan for the allocation of unique 10-digit address numbers. The numbers consists of a 3-digit area (numbering plan area) code, a 3-digit office code…
  28. North American Numbering Plan Numbering Resource Utilization/Forecasting (NRUF) Report The NANPA gathers forecast and utilization information to monitor and project exhaust in individual NPAs/area codes as well as in the NANP overall.
  29. not-ready condition At the data terminal equipment/data circuit-terminating equipment (DTE/DCE) interface, a steady-state condition that indicates that the DCE is not ready…
  30. Notarization 1. A method of changing a key-enciphering key so as to confirm the identities of the originator and the ultimate recipient. [After X9.8] 2.
  31. notch In a relatively wide band of frequencies, not necessarily of uniform amplitude, a narrow band of frequencies having relatively low amplitudes.
  32. notched filter Synonym band-stop filter.
  33. notched noise Noise from which a narrow band of frequencies has been removed. Note: Notched noise is usually used for testing devices or circuits.
  34. Np Abbreviation for neper.
  35. NPA Abbreviation for numbering plan area.
  36. NPA Code Relief NPA code relief refers to an activity that must be performed when and NPA nears exhaust of its 792 NXX capacity.
  37. NPA Relief Date The date by which the NPA is introduced and routing of normal commercial traffic begins.
  38. NRI Abbreviation for net radio interface.
  39. NRZ Abbreviation for non-return-to-zero.
  40. NRZ-M Synonym non-return-to-zero mark.
  41. NS/EP telecommunications Abbreviation for National Security or Emergency Preparedness telecommunications.
  42. NSA (National Security Agency) The NSA is the official cryptologic organization of the U.S. government. need-to-know: 1.
  43. NSFnet The high-speed national network that superseded ARPA Net as the framework of the Internet.
  44. NTI Northern Telecom Incorporated.
  45. NTN Abbreviation for network terminal number.
  46. NTSC standard Abbreviation for National Television Standards Committee standard. The North American standard (525-line interlaced raster-scanned video) for the…
  47. Nuclear Hardness A quantitative description of the resistance of a system or component to malfunction (temporary and permanent) and/or degraded performance induced by a…
  48. null The null type has one value, the null reference, represented by the literal null, which is formed from ASCII characters.
  49. null character (NUL) In transmission systems, a control character (a) that is used to accomplish media-fill stuffing or a time-fill stuffing in storage device or in a data…
  50. number portability A term used to describe the capability of individuals, businesses and organizations to retain their existing telephone number(s) and the same quality of…
  51. numbering plan area (NPA) 1. A defined geographic area identified by a unique three- digit code used in the North American Number Plan Area. [T1.207-1998] [T1.
  52. numerical aperture (NA) The sine of the vertex angle of the largest cone of meridional rays that can enter or leave an optical system or element, multiplied by the refractive…
  53. numerical aperture loss A loss of optical power that occurs at a splice or a pair of mated connectors when the numerical aperture of the "transmitting" fiber exceeds that of the…
  54. NVIS Near Vertical Incidence System (SINCGARS term).
  55. NXX code In the North American direct distance dialing numbering plan, a central office code of three digits that designates a particular central office or a given…
  56. Nyquist interval The maximum time interval between equally spaced samples of a signal that will enable the signal waveform to be completely determined.
  57. Nyquist rate The reciprocal of the Nyquist interval, i.e., the minimum theoretical sampling rate that fully describes a given signal, i.e.
  58. Nyquist's theorem A theorem, developed by H. Nyquist, which states that an analog signal waveform may be uniquely reconstructed, without error, from samples taken at equal…