- 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.
Of an electromagnetic wave, propagation in which the direct ray from the transmitter to the receiver is unobstructed, i.e., the transmission path is not established by or dependent upon reflection or diffraction. Note: The need for LOS propagation is most critical at VHF and higher frequencies.
Industry:Telecommunications
Of an electromagnetic wave, scattering that is attributable to the intrinsic properties of the material through which the wave is propagating. Note 1: Ionospheric scattering and Rayleigh scattering are examples of material scattering. Note 2: In an optical fiber, material scattering is caused by micro-inhomogeneities in the refractive indices of the materials used to fabricate the fiber, including the dopants used to modify the refractive index profile.
Industry:Telecommunications
Of an electromagnetic wave, the property that describes the orientation, i.e., time-varying direction and amplitude, of the electric field vector. Note 1: States of polarization are described in terms of the figures traced as a function of time by the projection of the extremity of a representation of the electric vector onto a fixed plane in space, which plane is perpendicular to the direction of propagation. In general, the figure, i.e., polarization, is elliptical and is traced in a clockwise or counterclockwise sense, as viewed in the direction of propagation. If the major and minor axes of the ellipse are equal, the polarization is said to be circular. If the minor axis of the ellipse is zero, the polarization is said to be linear. Rotation of the electric vector in a clockwise sense is designated right-hand polarization, and rotation in a counterclockwise sense is designated left-hand polarization. Note 2: Mathematically, an elliptically polarized wave may be described as the vector sum of two waves of equal wavelength but unequal amplitude, and in quadrature (having their respective electric vectors at right angles and /2 radians out of phase. )
Industry:Telecommunications
Of an electronic circuit or device, the degree to which it is subject to malfunction or failure under the influence of electromagnetic radiation.
Industry:Telecommunications
Of an impaired (degraded) or unserviceable telecommunications service or facility, action taken to repair it and return it to service. Note: Permanent or temporary restoration may be accomplished by various means, such as patching, rerouting, substitution of component parts, etc.
Industry:Telecommunications
Of an insulating material, the maximum electric field strength that it can withstand intrinsically without breaking down, i.e., without experiencing failure of its insulating properties. Note: The theoretical dielectric strength of a material is an intrinsic property of the bulk material and is not dependent on the configuration of the material or the electrodes with which the field is applied. 2. For a given configuration of dielectric material and electrodes, the minimum electric field that produces breakdown. Note 1: At breakdown, the electric field frees bound electrons, turning the material into a conductor. Note 2: The field strength at which breakdown occurs in a given case is dependent on the respective geometries of the dielectric (insulator) and the electrodes with which the electric field is applied, as well as the rate of increase at which the electric field is applied. Note 3: The electric field strength is usually expressed in volts per meter.
Industry:Telecommunications
Of an optical cable, a parallel cord of strong yarn that is situated under the jacket (s) of the cable for the purpose of facilitating jacket removal preparatory to splicing or breaking out. Note: The rip cord is exposed by carefully removing or severing a portion of the jacket near the end of the cable. It is then grasped with the fingers, or usually, with a tool such as a pair of pliers, and pulled to sever the jacket for the remainder of the desired distance.
Industry:Telecommunications
Of an optical emitter, the spectral line having the greatest power. Synonym peak wavelength.
Industry:Telecommunications
Of an optical emitter, the spectral line having the greatest power. Synonym peak wavelength.
Industry:Telecommunications
Of an optical fiber, a plot of attenuation as a function of wavelength. Note: Spectral loss curves must be normalized with respect to distance before meaningful comparison among fibers can be made.
Industry:Telecommunications
