- 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 packet switching, a self-contained packet, independent of other packets, that contains information sufficient for routing from the originating data terminal equipment (DTE) to the destination DTE without relying on prior exchanges between the equipment and the network. Note: Unlike virtual call service, when datagrams are sent there are no call establishment or clearing procedures. Thus, the network may not be able to provide protection against loss, duplication, or misdelivery.
Industry:Telecommunications
In opto-electronics, the frequency of incident radiant energy below which there is no photo-emissive effect.
Industry:Telecommunications
In optics, the reflection of a portion of incident light at a discrete interface between two media having different refractive indices. Note 1: Fresnel reflection occurs at the air-glass interfaces at the entrance and exit ends of an optical fiber. Resultant transmission losses, on the order of 4% per interface, can be reduced considerably by the use of index-matching materials. Note 2: The coefficient of reflection depends upon the refractive index difference, the angle of incidence, and the polarization of the incident radiation. For a normal ray, the fraction of reflected incident power is given by where R is the reflection coefficient and n1 and n2 are the respective refractive indices of the two media. In general, the greater the angle of incidence with respect to the normal, the greater the Fresnel reflection coefficient, but for radiation that is linearly polarized in the plane of incidence, there is zero reflection at Brewster's angle. Note 3: Macroscopic optical elements may be given antireflection coatings consisting of one or more dielectric thin-film layers having specific refractive indices and thicknesses. Antireflection coatings reduce overall Fresnel reflection by mutual interference of individual Fresnel reflections at the boundaries of the individual layers.
Industry:Telecommunications
In optics, the net angular deflection experienced by a light ray after one or more refractions or reflections.
Industry:Telecommunications
In optics, pertaining to a single wavelength of electromagnetic radiation or to a single color. Note: In practice, optical radiation is never perfectly monochromatic, i.e., it never consists of only one wavelength. It always has a finite spectral width, albeit narrow.
Industry:Telecommunications
In optics, pertaining to a light beam in which the far-field beam divergence is equal to that predicted by diffraction theory. 2. In focusing optics, pertaining to a light beam in which the impulse response or resolution limit is equal to that predicted by diffraction theory.
Industry:Telecommunications
In optics, characterized by a degree of coherence significantly less than 0. 88.
Industry:Telecommunications
In optics, an instrument for isolating narrow portions of the spectrum.
Industry:Telecommunications
In optics, an emission or absorption spectrum consisting of one or more narrow spectral lines, as opposed to a continuous spectrum.
Industry:Telecommunications
In optical-fiber technology, that surface of an optical fiber that is used to contact the transverse-alignment elements of a component such as a connector or mechanical splice. Note: For telecommunications-grade fibers, the reference surface is the outer surface of the cladding. For plastic-clad silica (PCS) fibers, which have a strippable polymer cladding (not to be confused with the polymer overcoat of an all-glass fiber,) the reference surface may be the core.
Industry:Telecommunications
