Glossary Terms Beginning N

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NASA: National Aeronautical Space Administration (US).
Near-field: Zone of non-ionizing radiation.
Newsgathering: Journalistic and technical process of gathering news for broadcast.
Noise: Unwanted and unmodulated energy that is always present to some extent within any signal; interference or unwanted signals.
Noise figure: Figure of merit of a device, such as an LNA or receiver, expressed in dB, which compares the device with a perfect one.
Noise floor: Level of constant residual noise in a system.
Non-dedicated: Satellite capacity that is not dedicated for any particular purpose, e.g. telephony, Internet, DTH.
Non-ionizing radiation: Electromagnetic radiation encompassing the spectrum of ultraviolet radiation, light, infrared radiation and radio frequency radiation, with low energy, insufficient to permanently alter cell structures.
NT1: Network termination device - ISDN.
NT2: Point at which a second network termination device such as an ISDN switchboard is connected to the NT1 at the T-interface.
NTSC: National Television Systems Committee: generic term for US analogue colour television system used in North America and Japan, based upon 60 fields per second and 525 lines.