- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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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.
The direct dialing of an international call from a customer in the NANP area to a customer outside the NANP area. The dialing format for an IDDD call is an international prefix followed by the international (E. 164) number, which typically consists of a country code and a national number.
Industry:Telecommunications
The diffraction pattern of an electromagnetic wave, which pattern is observed close to a source or aperture, as distinguished from a far-field diffraction pattern. Note: The pattern in the output plane is called the near-field radiation pattern. Synonym Fresnel diffraction pattern.
Industry:Telecommunications
The diffraction pattern of a source (such as an LED, ILD, or the output end of an optical fiber) observed at an infinite distance from the source. Note 1: A far-field pattern exists at distances that are large compared with s2/, where s is a characteristic dimension of the source and is the wavelength. For example, if the source is a uniformly illuminated circle, then s is the radius of the circle. Note 2: The far-field diffraction pattern of a source may be observed at infinity or (except for scale) in the focal plane of a well-corrected lens. The far-field pattern of a diffracting screen illuminated by a point source may be observed in the image plane of the source. Synonym Fraunhofer diffraction pattern.
Industry:Telecommunications
The diffraction pattern of a source (such as an LED, ILD, or the output end of an optical fiber) observed at an infinite distance from the source. Note 1: A far-field pattern exists at distances that are large compared with s2/, where s is a characteristic dimension of the source and is the wavelength. For example, if the source is a uniformly illuminated circle, then s is the radius of the circle. Note 2: The far-field diffraction pattern of a source may be observed at infinity or (except for scale) in the focal plane of a well-corrected lens. The far-field pattern of a diffracting screen illuminated by a point source may be observed in the image plane of the source. Synonym Fraunhofer diffraction pattern.
Industry:Telecommunications
The difference between available signal power and the minimum signal power needed to overcome system losses and still satisfy the minimum input requirements of the receiver for a given performance level. Note: System power margin reflects the excess signal level, present at the input of the receiver, that is available to compensate for (a) the effects of component aging in the transmitter, receiver, or physical transmission medium, and (b) a deterioration in propagation conditions. Synonym system power margin.
Industry:Telecommunications
The difference in power levels between the singing point and the operating gain of a system or component.
Industry:Telecommunications
The difference in loss at specified frequencies relative to the loss at 1004 Hz, unless otherwise specified.
Industry:Telecommunications
The difference between the theoretical gain of a very large antenna, such as the antennas in beyond-the-horizon microwave links, and the gain that can be realized in operation. Note 1: Aperture-to-medium coupling loss is related to the ratio of the scatter angle to the antenna beamwidth. Note 2: The "very large antennas" are referred to in wavelengths; thus, this loss can apply to line-of-sight systems also.
Industry:Telecommunications
The difference between the minimum clearance or authorization of information system (IS) users and the maximum sensitivity (e.g., classification and categories) of data processed by the system.
Industry:Telecommunications
The difference between the measured modulation rate and the theoretical modulation rate in a digital system.
Industry:Telecommunications
