- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
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 lowest frequency in the HF band at which the received field intensity is sufficient to provide the required signal-to-noise ratio for a specified time period, e.g., 0100 to 0200 UTC, on 90% of the undisturbed days of the month.
Industry:Telecommunications
The lowest excitation level at which laser output is dominated by stimulated emission rather than by spontaneous emission.
Industry:Telecommunications
The lower layers of atmosphere, in which the change of temperature with height is relatively large. It is the region where clouds form, convection is active, and mixing is continuous and more or less complete. 2. The layer of the Earth's atmosphere, between the surface and the stratosphere, in which temperature decreases with altitude and which contains approximately 80% of the total air mass. Note: The thickness of the troposphere varies with season and latitude. It is usually 16 km to 18 km thick over tropical regions, and less than 10 km thick over the poles.
Industry:Telecommunications
The loss that occurs when energy is transferred from one circuit, circuit element, or medium to another. Note: Coupling loss is usually expressed in the same units--such as watts or dB--as in the originating circuit element or medium. 2. In fiber optics, the power loss that occurs when coupling light from one optical device or medium to another.
Industry:Telecommunications
The loss that could be provided by a digital loop carrier system or a fiber-in-the-loop system when a short customer analog access cable results in below-average attenuation.
Industry:Telecommunications
The loss resulting from the insertion of a device in a transmission line, expressed as the reciprocal of the ratio of the signal power delivered to that part of the line following the device to the signal power delivered to that same part before insertion. Note: Insertion loss is usually expressed in dB. 2. In an optical fiber system, the total optical power loss caused by insertion of an optical component, such as a connector, splice, or coupler.
Industry:Telecommunications
The loss of energy by an electromagnetic wave because of scattering, refraction, and/or absorption during its passage through a volume of the atmosphere containing precipitation such as rain, snow, hail, or sleet.
Industry:Telecommunications
The longitudinal center of symmetry of an optical fiber, i.e., the locus of points that are determined by the centers of mechanical symmetry of the outside diameters of fiber cross sections sampled continuously along the length of the fiber.
Industry:Telecommunications
The logical link between the device performing an electronic surveillance access function and the LEA (law enforcement agency) that primarily carries call-identifying information.
Industry:Telecommunications
The logical connection between extended superframe termination points (i.e., path terminations) on the customer access (CA) and the customer installation (CI. )
Industry:Telecommunications
