- Industry: Telecommunications
- Number of terms: 29235
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
For a computer program, (a) the structure, relationships, and arrangement of the components of the program, (b) the program interfaces, and (c) the interface requirements for the program operating environment.
Industry:Telecommunications
For a computer, a device that handles the transfer of data between internal memory and peripheral equipment.
Industry:Telecommunications
For a frame relay logical connection, the average number of end user bits transferred per second, in one direction, across a user-network interface as measured over an interval of duration 't'. The measurement interval 't' is network dependent.
Industry:Telecommunications
For a given class of emission, the width of the frequency band which is just sufficient to ensure the transmission of information at the rate and with the quality required under specified conditions. Note: Emissions useful for the adequate functioning of the receiving equipment, e.g., the emission corresponding to the carrier of reduced carrier systems, must be included in the necessary bandwidth. (See Annex J of NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management for formulas used to calculate necessary bandwidth. ) 2. The calculated spectral width of an emission. Calculations are made using procedures set forth in part 2 of this chapter. The bandwidth so calculated is considered to be the minimum necessary to convey information at the desired rate with the desired accuracy.
Industry:Telecommunications
For a given propagation mode of an electromagnetic wave, the ratio of the field strength at a specified height to the field strength at the surface of the Earth.
Industry:Telecommunications
For a given wavelength, an expression of the transmittance of an optical element. Note 1: Optical density is expressed by log10 (1/T) where T is transmittance. Note 2: The higher the optical density, the lower the transmittance. Note 3: Optical density times 10 is equal to transmission loss expressed in decibels, e.g., an optical density of 0. 3 corresponds to a transmission loss of 3 dB.
Industry:Telecommunications
For a particular message path, any intermediate network between a branch point and a subsequent branch point or convergence point is a selected network.
Industry:Telecommunications
For a periodic function, the number of cycles or events per unit time. 2. The number of cycles occurring per second of an electrical or electromagnetic wave; a number representing a specific point in the electromagnetic spectrum.
Industry:Telecommunications
For a photodetector, a figure of merit used to characterize performance, equal to the reciprocal of noise equivalent power (NEP,) normalized to unit area and unit bandwidth. Note: Specific detectivity, D*, is given by #f44 where A is the area of the photosensitive region of the detector and f is the effective noise bandwidth. Synonym D-Star.
Industry:Telecommunications
For a plane electromagnetic wavefront incident on a plane boundary between two dielectric media having different refractive indices, the angle of incidence at which transmittance from one medium to the other is unity when the wavefront is linearly polarized with its electric vector parallel to the plane of incidence. Note 1: Brewster's angle B, is given by where n1 and n2 are the refractive indices of the respective media, and 1 and 2, their respective electric permittivities. Note 2: For a randomly polarized ray incident at Brewster's angle, the reflected and refracted rays are at 90° with respect to one another.
Industry:Telecommunications
