- Industrie: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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The changing of one or more keys that are used for either COMSEC or TRANSEC functions.
Industry:Telecommunications
The changing from listening to transmissions intended for one broadcast area to listening to transmissions intended for another broadcast area. Note 1: An area broadcast shift may occur when a ship or aircraft crosses the boundary between listening areas. Note 2: Shift times, on the date a ship or aircraft is expected to pass into another area, must be strictly observed or the ship or aircraft will miss messages intended for it. Synonym radio watch shift.
Industry:Telecommunications
The branch of optics that describes light propagation in terms of rays. Note 1: Rays are bent at the interface between two dissimilar media, and may be curved in a medium in which the refractive index is a function of position. Note 2: The ray in geometric optics is perpendicular to the wavefront in physical optics. Synonym ray optics.
Industry:Telecommunications
The change in the observed frequency (or wavelength) of a wave, caused by a time rate of change in the effective path length between the source and the point of observation.
Industry:Telecommunications
The change in phase of a periodic signal with respect to a reference.
Industry:Telecommunications
The central region about the longitudinal axis of an optical fiber, which region supports guiding of the optical signal. Note 1: For the fiber to guide the optical signal, the refractive index of the core must be slightly higher than that of the cladding. Note 2: In different types of fibers, the core and core-cladding boundary function slightly differently in guiding the signal. Especially in single-mode fibers, a significant fraction of the energy in the bound mode travels in the cladding. 2. A piece of ferromagnetic material, usually toroidal in shape, used as a component in a computer memory device. Note: The type of memory referred to has very limited application in today's computer environment. It has been largely replaced by semiconductor and other technologies. 3. The material at the center of an electromechanical relay or solenoid, about which the coil is wound.
Industry:Telecommunications
The center of the assigned frequency band assigned to a station. 2. The frequency of the center of the radiated bandwidth. Note: The frequency of the rf carrier, whether suppressed or radiated, is usually given in parentheses following the assigned frequency, and is the frequency appearing in the dial settings of rf equipment intended for single-sideband or independent-sideband transmission. 3. The frequency coinciding with the center of an authorized bandwidth of emission. 4. The center of the frequency band assigned to a station.
Industry:Telecommunications
The carrier remaining after carrier suppression in a suppressed carrier transmission system. Note: Sometimes the residual carrier is used to provide the reference for an automatic frequency control system.
Industry:Telecommunications
The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for systematic inspection, detection, and correction of incipient failures either before they occur or before they develop into major defects. 2. Maintenance, including tests, measurements, adjustments, and parts replacement, performed specifically to prevent faults from occurring.
Industry:Telecommunications
