- 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 frequency band within which the emission of a station is authorized; the width of the band equals the necessary bandwidth plus twice the absolute value of the frequency tolerance. Where space stations are concerned, the assigned frequency band includes twice the maximum Doppler shift that may occur in relation to any point of the Earth's surface.
Industry:Telecommunications
The frequency associated with the difference between two discrete energy levels in an atomic system, given by where f 2,1 is the frequency associated with the difference between two energy levels, E2 and E1 (E2 > E1,) and is Planck's constant. Note: If a transition from E2 to E1 occurs, a photon with frequency f 2,1 is likely to be emitted. If the atomic system is at energy level E1, and a photon of frequency f 2,1 is absorbed, the energy level will be raised to E2.
Industry:Telecommunications
The free-space wavelength that corresponds to the critical frequency. Note: The critical wavelength is equal, in meters, to the speed of light (3 × 108 m/s) divided by the critical frequency in hertz.
Industry:Telecommunications
The formatting of data into blocks for purposes of transmission, storage, checking, or other functions. 2. Denying access to, or use of, a facility, system, or component. 3. The failure of a telecommunications network to meet a user service demand, because of the lack of an available communications path.
Industry:Telecommunications
The format used to express the time of an event. Note: The time of an event on the UTC time scale is given in the following sequence: hour, day, month, year; e.g., 0917 UT, 30 August 1997. The hour is designated by the 24-hour system.
Industry:Telecommunications
The formalization of a multidisciplinary agreement—regarding digital image characteristics, such as the structure of digital image files, the organization of the image data itself, and the definition of fully flexible, interoperable, scalable, and extensible systems—which agreement facilitates the exchange of such files across various technology interfaces.
Industry:Telecommunications
The form or point of interface, usually indicated by a command prompt, on some operating systems in which a command is entered. 2. Describing a system that uses a command-line interface.
Industry:Telecommunications
The fluctuation of the time interval error caused by the instability of a real clock.
Industry:Telecommunications
The fluctuation of the phase of a wave, relative to a reference. Note: The fluctuation is often from unknown causes.
Industry:Telecommunications
The first three digits (N) of the seven-digit telephone number assigned to a customer's telephone exchange service when dialed on a local basis. Synonym prefix.
Industry:Telecommunications
