- 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.
In the military community, the system-specific characteristics, not dictated by the individual components' electrical performance characteristics, but necessary in order to permit internal and external interoperability.
Industry:Telecommunications
In the modulation of a carrier, a change from one significant condition to another. Note 1: Examples of signal transitions are a change from one electrical current, voltage, or power level to another; a change from one optical power level to another; a phase shift; or a change from one frequency or wavelength to another. Note 2: Signal transitions are used to create signals that represent information, such as "0" and "1" or "mark" and "yyspace. " 2. For channel-associated signaling, a change in state of the A bit for 2-state signaling, A and/or B bit in 4-state signaling, or the A, B, C, and/or D bit for 16-state signaling.
Industry:Telecommunications
In the modulation of a carrier, a change from one significant condition to another. Note 1: Examples of signal transitions are a change from one electrical current, voltage, or power level to another; a change from one optical power level to another; a phase shift; or a change from one frequency or wavelength to another. Note 2: Signal transitions are used to create signals that represent information, such as "0" and "1" or "mark" and "yyspace. " 2. For channel-associated signaling, a change in state of the A bit for 2-state signaling, A and/or B bit in 4-state signaling, or the A, B, C, and/or D bit for 16-state signaling.
Industry:Telecommunications
In the modulation of a carrier, one of the values of the signal parameter chosen to represent information. Note 1: Examples of significant conditions are an electrical current, voltage, or power level; an optical power level; a phase value; or a frequency or wavelength chosen to represent a "0" or a "1"; or a "mark" or a "yyspace. " Note 2: The duration of a significant condition is the time interval between successive significant instants. Note 3: A change from one significant condition to another is called a "signal transition. " Note 4: Signal transitions are used to create signals that represent information, such as "0" and "1" or "mark" and "space. " Note 5: Significant conditions are recognized by an appropriate device. Each significant instant is determined when the appropriate device assumes a condition or state usable for performing a specific function, such as recording, processing, or gating.
Industry:Telecommunications
In the North American direct distance dialing numbering plan, a central office code of three digits that designates a particular central office or a given 10,000-line unit of subscriber lines; "N" is any number from 2 to 9, and "X" is any number from 0 to 9.
Industry:Telecommunications
In the numeration system commonly used in scientific notation, the real number that is raised to a power denoted by the exponent and then multiplied by the coefficient to determine the value of the number represented without the use of exponents. Note: An example of a base is the number 6. 25 in the expression 2. 70 × 6. 251. 5 42. 19. The 2. 70 is the coefficient and the 1. 5 is the exponent. In the decimal numeration system, the base is 10 and in the binary numeration system, the base is 2. The value e 2. 718 is the natural base. 2. A reference value. 3. A number that is multiplied by itself as many times as indicated by an exponent.
Industry:Telecommunications
In the optical regime, an element that selectively transmits or blocks a range of wavelengths, polarizations, etc. , or selectively displaces a beam, e.g., by virtue of birefringence.
Industry:Telecommunications
In the optical regime, the property of an element (rod or slab of material) that (a) has a refractive index gradient that is a defined function of the radial distance from its optical axis, and (b) by virtue of which gradient, is capable of focusing light in a manner after that of a conventional simple lens. Note 1: For example, a self-focusing slab (i.e., a plane-parallel, usually circular) element that is analogous in function to a convex simple lens, is relatively thin with respect to its diameter. By virtue of the fact that its refractive index is at a maximum along its optical axis (which is perpendicular to the faces of the slab,) and decreases radially as a function of distance from the optical axis, it is able to bring a beam of light to a focus. If the thickness of the slab is increased greatly, so that it becomes a rod having a length very many times its diameter, it is able to relay a beam or image in a cyclical fashion in much the same manner as a series of discrete conventional lenses and bring it to a final focus, e. G. , at or just outside the endface of the rod. (This phenomenon should not be confused with the relaying of images by means of a spatially coherent bundle of a large number of individual optical fibers, each having a diameter of microscopic proportions, and each of which in effect relays a single pixel, and within which bundle no focusing takes place. ) Note 2: Within a self-focusing element, the rays traverse curved paths, unlike the straight internal paths that characterize conventional lenses or lens elements that are made of homogeneous materials having a uniform refractive index. In a conventional single- or multi-element lens, the rays may change direction abruptly at a refractive discontinuity, such as an air-glass boundary, or the boundary between the crown and flint elements of an achromatic lens, but within each such element, the ray paths are straight. Note 3: Self-focusing elements do not produce images of a quality that may be obtained with the best conventional multi-element lenses.
Industry:Telecommunications
In the output of a nonlinear system, a frequency produced by intermodulation of harmonics of the frequencies present in the input signal.
Industry:Telecommunications
In the output signal of a device, distortion caused by the presence of frequencies that are not present in the input signal. Note: Harmonic distortion is caused by nonlinearities within the device.
Industry:Telecommunications
