- 産業: Telecommunications
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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 frame-relay transmission systems, 13-bit field that defines the destination address of a packet. The address is local on a link-by-link basis.
Industry:Telecommunications
In FM transmission, the process of restoring (after detection) the amplitude-vs. -frequency characteristics of the signal.
Industry:Telecommunications
In FM transmission, the intentional alteration of the amplitude-vs. -frequency characteristics of the signal to reduce adverse effects of noise in a communication system. Note: The high-frequency signal components are emphasized to produce a more equal modulation index for the transmitted frequency spectrum, and therefore a better signal-to-noise ratio for the entire frequency range.
Industry:Telecommunications
In FM broadcasting, the improvement in the signal-to-noise ratio of the high-frequency portion of the baseband, i.e., modulating, signal, which improvement results from passing the modulating signal through a preemphasis network. Note: Preemphasis increases the magnitude of the higher signal frequencies, thereby improving the signal-to-noise ratio. At the output of the discriminator in the FM receiver, a deemphasis network restores the original signal power distribution.
Industry:Telecommunications
In fiber optics, the efficiency of optical power transfer between two optical components. Note 1: The transfer may take place (a) between an active component, such as an LED, and a passive component, such as an optical fiber, or (b) between two passive components such as two optical fibers. Note 2: Coupling efficiency is usually expressed as the ratio, converted to percent, of the input power, i.e., the available power from one component, to the power transferred to the other component.
Industry:Telecommunications
In fiber optics, the cone within which optical power may be coupled into the bound modes of an optical fiber. Note: The acceptance cone is derived by rotating the acceptance angle about the fiber axis.
Industry:Telecommunications
In fiber optics, half the vertex angle of the cone of light emitted at the exit face of an optical fiber. Note: The cone boundary is usually defined (a) by the angle at which the far-field irradiance has decreased to a specified fraction of its maximum value or (b) as the cone within which there is a specified fraction of the total radiated power at any point in the far field. Synonym output angle.
Industry:Telecommunications
In fiber optics, a loss of optical power at a splice or connector, caused by a lateral, i.e., transverse, offset of the mating fiber cores, which offset causes an imperfect transfer of the optical signal from the "transmitting" fiber to the "receiving" fiber. Note: The effect of a given amount of lateral offset will depend on other parameters such as the relative diameters of the respective cores. For example: if, because of manufacturing tolerances, the "transmitting" core is smaller than the "receiving" core, the effect will be less than if both cores were the same size. 2. An analogous loss of optical power caused by lateral misalignment of the fiber and optical source. Synonym transverse offset loss.
Industry:Telecommunications
In fiber optics, half the vertex angle of that cone within which optical power may be coupled into bound modes of an optical fiber. Note 1: The axis of the cone is collinear with the fiber axis, the vertex of the cone is on the fiber end-face, and the base of the cone faces the optical power source. Note 2: The acceptance angle is measured with respect to the fiber axis. Note 3: Rays entering an optical fiber at angles greater than the acceptance angle are coupled into unbound modes.
Industry:Telecommunications
In fiber optics, a splice created by localized heating of the ends of the two fibers to be joined. Note: A properly made fusion splice results in a continuous length of material with minimal discontinuities at the splice.
Industry:Telecommunications
