- 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.
The reception of emissions from a space station in the broadcasting-satellite service by receiving equipment, which in some cases may be complex and have antennae larger than those used for individual reception, and intended for use: by a group of the general public at one location; or through a distribution system covering a limited area.
Industry:Telecommunications
The reception and retransmission by a radio station of signals that are received either from another radio station or from a wire, fiber optic, microwave, coaxial cable, or other link of an integrated land line and radio communications system component. 2. A terrestrial point-to-point communications system, such as a microwave-relay communications system or a satellite communications system. Note: The siting of radio-relay stations and the radio coverage diagrams of the antenna patterns are arranged for minimum interference with satellite Earth stations. The analog and digital baseband arrangements are similar to satellite systems. Radio-relay links may form part of the connection between an Earth station and a switching center.
Industry:Telecommunications
The rear part of the theater of war or theater of operations that contains the lines of communications, theater logistics bases, forward operating bases, and other agencies required for the immediate support and maintenance of the field forces. It extends back to the CONUS base.
Industry:Telecommunications
The real part of the propagation constant in any electromagnetic propagation medium. Note 1: The attenuation constant is usually expressed as a numerical value per unit length. Note 2: The attenuation constant may be calculated or experimentally determined for each medium. 2. For a particular propagation mode in an optical fiber, the real part of the axial propagation constant.
Industry:Telecommunications
The ratio, usually expressed in dB, of the power of a jamming signal to that of a desired signal at a given point such as the antenna terminals of a receiver.
Industry:Telecommunications
The ratio, at the junction of a transmission line and a terminating impedance or other discontinuity, of the amplitude of the reflected wave to the amplitude of the incident wave. Note 1: Return loss is usually expressed in dB. Note 2: Return loss is a measure of the dissimilarity between impedances in metallic transmission lines and loads, or between refractive indices in dielectric media, e.g., optical fibers. Note 3: In a metallic transmission line, return loss is given by where Z1 is the impedance toward the source and Z2 is the impedance toward the load, and the vertical bars indicate magnitude. Note 4: For dielectric media, e.g., optical fibers, see reflection loss.
Industry:Telecommunications
The ratio of total call attempts that result in call set-up failure to the total call attempts in a population of interest.
Industry:Telecommunications
The ratio of total call attempts that result in call set-up error to the total call attempts in a population of interest.
Industry:Telecommunications
The ratio of the transmitted power to the incident power. Note 1: In optics, transmittance is usually expressed as optical density or in percent. Note 2: Transmittance was formerly called "transmission. "
Industry:Telecommunications
The ratio of the power required at the input of a loss-free reference antenna to the power supplied to the input of the given antenna to produce, in a given direction, the same field strength at the same distance. Note 1: Antenna gain is usually expressed in dB. Note 2: Unless otherwise specified, the gain refers to the direction of maximum radiation. The gain may be considered for a specified polarization. Depending on the choice of the reference antenna, a distinction is made between: absolute or isotropic gain (Gi,) when the reference antenna is an isotropic antenna isolated in space; gain relative to a half-wave dipole (Gd) when the reference antenna is a half-wave dipole isolated in space and with an equatorial plane that contains the given direction; gain relative to a short vertical antenna (Gr,) when the reference antenna is a linear conductor, much shorter than one quarter of the wavelength, normal to the surface of a perfectly conducting plane which contains the given direction. Synonyms gain of an antenna, power gain of an antenna.
Industry:Telecommunications
