- 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 ratio of the transmitted field strength to the incident field strength of an electromagnetic wave when it is incident upon an interface surface between media with two different refractive indices. 2. In a transmission line, the ratio of the amplitude of the complex transmitted wave to that of the incident wave at a discontinuity in the line. 3. The probability that a portion of a communications system, such as a line, circuit, channel or trunk, will meet specified performance criteria. Note: The value of the transmission coefficient is inversely related to the quality of the line, circuit, channel or trunk.
Industry:Telecommunications
The ratio of the total time that the individual channels experience the freeze-out condition to the total time of the active intervals, and their corresponding hangover times and front end delays, for all transmission trunks over a fixed interval of time, e.g., 1 minute.
Industry:Telecommunications
The ratio of the total radiated power to the total input power. Note: The total radiated power is the total input power less antenna dissipative losses.
Industry:Telecommunications
The ratio of the sum of the individual maximum demands of the various parts of a power distribution system to the maximum demand of the whole system. Note: The diversity factor is always greater than unity.
Industry:Telecommunications
The ratio of the speech power to the power of speech-correlated noise in a digital transmission system.
Industry:Telecommunications
The ratio of the signal power, at a given point in a transmission system, to a reference signal power. Note: The ratio is usually determined by applying a standard test tone at zero transmission level point (or applying adjusted test tone power at any other point) and measuring the gain or loss to the location of interest. A distinction should be made between the standard test tone power and the expected median power of the actual signal required as the basis for the design of transmission systems.
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
The ratio of the number of bits, unit elements, characters, or blocks incorrectly received and undetected, to the total number of bits, unit elements, characters, or blocks sent. Synonyms residual error rate, undetected error rate.
Industry:Telecommunications
The ratio of the power in a disturbing circuit to the induced power in the disturbed circuit observed at specified points of the circuits under specified terminal conditions. Note: Crosstalk coupling is usually expressed in dB. Synonym crosstalk coupling loss.
Industry:Telecommunications
The ratio of the number of misdelivered blocks to the total number of block transfer attempts during a specified period.
Industry:Telecommunications
