- Industry: 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.
1. The person or organization that purchases a Target of Evaluation. 2. The corroboration that the source of data received is as claimed.
Industry:Telecommunications
1. The independent variable used to express a function. Note: Examples of domains are time, frequency, and space. 2. In distributed networks, all the hardware and software under the control of a specified set of one or more host processors. 3. A unique context (e. G. , access control parameters) in which a program is operating; in effect, the set of objects a subject has the privilege to access. 4. The set of objects that a subject has the ability to access.
Industry:Telecommunications
1. The diminution, usually expressed in dB, of signal level in a communications medium. 2. The power, usually expressed in watts, consumed or dissipated by a circuit or component without accomplishing useful work or purpose; e. G. , heating (hysteresis loss) that occurs in the core of a transformer. 3. In computer security, a quantitative measure of harm or deprivation resulting from a compromise.
Industry:Telecommunications
A broadband communications technology in which multiple television channels, as well as audio and data signals, may be transmitted either one way or bidirectionally through an often hybrid (fiber and coaxial) distribution system to a single or to multiple specific locations. CATV originated in areas where good reception of direct broadcast TV was not possible. Now CATV also consists of a cable distribution system to large metropolitan areas in competition with direct broadcasting. The abbreviation CATV originally meant community antenna television. However, CATV is now usually understood to mean cable TV.
Industry:Telecommunications
A "mark" that has the same polarity as the previous "mark" in the transmission of alternate mark inversion (AMI) signals. Note: In some transmission protocols, AMI violations are deliberately introduced to facilitate synchronization or to signal a special event.
Industry:Telecommunications
A 7- or 10-digit call to the directory number of the public service answering point (PSAP) (where applicable) causing the E911 system (emergency 9-1-1 system) to send to the PSAP a multifrequency (MF) pulse train devoid of the caller's emergency service identification.
Industry:Telecommunications
1. The measures used to provide physical protection of resources against deliberate and accidental threats. 2. See communications security.
Industry:Telecommunications
1. The basis for coordinated dissemination of time signals, counted from 0000 at midnight. 2. In celestial navigation applications, the time which gives the exact rotational orientation of the Earth obtained from UTC by applying increments determined by the U. S. Naval Observatory. 3. A measure of time that conforms, within a close approximation, to the mean diurnal rotation of the Earth and serves as the basis of civil timekeeping. Note: Universal Time (UT1) is determined from observations of the stars, radio sources, and also from ranging observations of the Moon and artificial Earth satellites. The scale determined directly from such observations is designated Universal Time Observed (UTO); it is slightly dependent on the place of observation. When UTO is corrected for the shift in longitude of the observing station caused by polar motion, the time scale UT1 is obtained. When an accuracy better than one second is not required, Universal Time can be used to mean Coordinated Universal Time (UTC. ) Synonym Zulu Time. 4. The official civil time of the United Kingdom. Formerly called Greenwich Mean Time.
Industry:Telecommunications
1. In a scanned image system, electrical compensation for the distortion introduced by the limiting size of a scanning aperture. 2. In television technology, restoration of the depth of modulation to the higher (i. E. , higher Fourier) frequency components of the video signal, with the objective of achieving a subjective improvement in image quality. Note: Aperture correction is required to compensate for the properties of the camera lens, optical beam-splitting installation, and camera tube, all of which contribute to a reduced signal at higher spatial frequencies. Problems requiring aperture correction arise in a scanning system when the frequency response falls off as the effective wavelength of the detail to be resolved in the image approaches the dimension of the scanning aperture and becomes zero when that effective wavelength equals the dimension of the scanning aperture.
Industry:Telecommunications
1. In a public switched telecommunications network, the ultimate user, i. E. , customer, of a communications service. Note 1: Subscribers include individuals, activities, organizations, etc. Note 2: Subscribers use end instruments, such as telephones, modems, facsimile machines, computers, and remote terminals, that are connected to a central office. Note 3: Subscribers are usually subject to tariff. Note 4: Subscribers do not include communications systems operating personnel except for their personal terminals. 2. In cryptography, a party that has a keying relationship with a center or an entity that has a certificate from a certification authority.
Industry:Telecommunications
