- 産業: 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.
A test to determine whether a value conforms to specified criteria. Note: A reasonableness check can be used to eliminate questionable data points from subsequent processing. Synonym wild-point detection.
Industry:Telecommunications
A testing device that compares a received data pattern with a known transmitted pattern to determine the level of transmission quality.
Industry:Telecommunications
A testing device that permits a user to access individual leads of an interface cable, using jumper wires, in order to monitor, switch, or patch the electrical output of the cable.
Industry:Telecommunications
A theorem, developed by H. Nyquist, which states that an analog signal waveform may be uniquely reconstructed, without error, from samples taken at equal time intervals. The sampling rate must be equal to, or greater than, twice the highest frequency component in the analog signal. Synonym sampling theorem.
Industry:Telecommunications
A theorem, developed by H. Nyquist, which states that an analog signal waveform may be uniquely reconstructed, without error, from samples taken at equal time intervals. The sampling rate must be equal to, or greater than, twice the highest frequency component in the analog signal. Synonym sampling theorem.
Industry:Telecommunications
A theoretical concept of space devoid of all matter. Note: Free space also implies remoteness from material objects that could influence the propagation of electromagnetic waves.
Industry:Telecommunications
A thin slice of semiconducting material, such as a silicon crystal, upon which microcircuits are constructed by diffusion and deposition of various materials. Note: Millions of individual circuit elements, constituting hundreds of microcircuits, may be constructed on a single wafer. The individual microcircuits are separated by scoring and breaking the wafer into individual chips ("dice". )
Industry:Telecommunications
A thin, dielectric or metallic film, or several such films, applied to an optical surface to reduce its reflectance and thereby increase its transmittance. Note: For minimum reflection of a normal incident wave of a single wavelength, the antireflection coating may consist of a single layer and must have (a) a refractive index equal to the square root of the refractive indices of the materials bounding the coating, and (b) a thickness equal to one-quarter the wavelength in question (i.e., the wavelength within the material of which the coating consists. ) For minimum reflection of multiple wavelengths, additional layers must be added.
Industry:Telecommunications
A third circuit derived from two suitably arranged pairs of wires, called side circuits, with each pair of wires being a circuit in itself and at the same time acting as one conductor of the third circuit. Note: The side circuits are coupled to their respective drops by center-tapped transformers, usually called "repeat coils. " The center taps are on the line side of the side circuits. Current from the phantom circuit is split evenly by the center taps. This cancels crosstalk from the phantom circuit to the side circuits. Synonym phantom facility.
Industry:Telecommunications
A three-dimensional section of the radiation pattern of a directional antenna, bounded by one or more cones of nulls or by regions of diminished irradiance.
Industry:Telecommunications
