- 업종: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
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.
A measure of a computer system or subsystem to perform its functions; for example, response time, throughput, number of transactions per second.
Industry:Telecommunications
A measure of confidence as described in CESG Computer Security Memorandum No. 3 - "UK Systems Security Confidence Levels". Note: ITSEC uses the term "assurance" rather than "confidence".
Industry:Telecommunications
A measure of the ability of a lens or optical system to form separate and distinct images of two objects with small angular separation. Note 1: An optical system cannot form a perfect image of a point (i.e., point source. ) Instead, it performs what is essentially a Fourier transform, and the resolving power of an optical system may be expressed in terms of an optical transform (transfer function) called the modulation transfer function (MTF. ) Note 2: The resolving power of an optical system is ultimately limited by (a) the wavelength involved, and (b) diffraction by the aperture, a larger aperture having greater resolving power than a smaller one. Note 3: While the term "resolving power" is usually applied to the traditional optical regime, it may also be applied to, e. G. , the radio regime, especially at, but not necessarily limited to, very short wavelengths, on the order of millimeters or centimeters. Note 4: Especially at longer wavelengths, certain schemes may be employed to create a very large synthetic aperture, thereby increasing resolving power. Some of these schemes involve precise measurements of the respective times of arrival, at geographically separate locations, of signals from separate sources. Synonym resolution.
Industry:Telecommunications
A measure of the ability of a lens or optical system to form separate and distinct images of two objects with small angular separation. Note 1: An optical system cannot form a perfect image of a point (i.e., point source. ) Instead, it performs what is essentially a Fourier transform, and the resolving power of an optical system may be expressed in terms of an optical transform (transfer function) called the modulation transfer function (MTF. ) Note 2: The resolving power of an optical system is ultimately limited by (a) the wavelength involved, and (b) diffraction by the aperture, a larger aperture having greater resolving power than a smaller one. Note 3: While the term "resolving power" is usually applied to the traditional optical regime, it may also be applied to, e. G. , the radio regime, especially at, but not necessarily limited to, very short wavelengths, on the order of millimeters or centimeters. Note 4: Especially at longer wavelengths, certain schemes may be employed to create a very large synthetic aperture, thereby increasing resolving power. Some of these schemes involve precise measurements of the respective times of arrival, at geographically separate locations, of signals from separate sources. Synonym resolution.
Industry:Telecommunications
A measure of the ability of a receiver to discriminate between a wanted signal on one frequency and unwanted signals on other frequencies.
Industry:Telecommunications
A measure of the ability of a timing synchronization system to minimize the clock difference between a master clock and any slaved clock.
Industry:Telecommunications
A measure of the ability to duplicate controllable conditions. Note: An example of resettability is the ability to reset the frequency controls of radio equipment.
Industry:Telecommunications
A measure of the attenuation caused by absorption of energy per unit of distance that occurs in an electromagnetic wave of given wavelength propagating in a material medium of given refractive index. Note: The value of the absorption index K' is given by the relation #f01 where K is the absorption coefficient, is the wavelength in vacuum, and n is the refractive index of the absorptive material medium. 2. The functional relationship between the Sun angle--at any latitude and local time--and the ionospheric absorption.
Industry:Telecommunications
A measure of the attenuation caused by absorption of energy that results from its passage through a medium. Note 1: Absorption coefficients are usually expressed in units of reciprocal distance. Note 2: The sum of the absorption coefficient and the scattering coefficient is the attenuation coefficient.
Industry:Telecommunications
A measure of the average occupancy of a facility during a specified period of time, normally a busy hour, measured in traffic units (erlangs) and defined as the ratio of the time during which a facility is occupied (continuously or cumulatively) to the time this facility is available for occupancy. Note: A traffic intensity of one traffic unit (one erlang) means continuous occupancy of a facility during the time period under consideration, regardless of whether or not information is transmitted. Synonym call intensity.
Industry:Telecommunications
