- 産業: 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.
A ray of electromagnetic radiation that follows the path of least possible propagation time between transmitting and receiving antennas. Note: The path of least propagation time is not always the shortest distance path.
Industry:Telecommunications
A ray that undergoes a change of velocity, or in the general case, both velocity and direction, as a result of interaction with the material medium in which it travels. 2. In an optical fiber, a ray that is refracted from the core into the cladding. Specifically a ray having direction such that where r is the radial distance from the fiber axis, (r) is the azimuthal angle of projection of the ray at r on the transverse plane, (r) is the angle the ray makes with the fiber axis, n (r) is the refractive index at r, n (a) is the refractive index at the core radius, a. Refracted rays correspond to radiation modes in the terminology of mode descriptors.
Industry:Telecommunications
A read/write, nonsequential-access memory used for the storage of instructions and data. Note 1: RAM access time is essentially the same for all storage locations. Note 2: RAM is characterized by a shorter access time than disk or tape storage. Note 3: RAM is usually volatile.
Industry:Telecommunications
A recommended practice intended to provide a method of coding video index information in which various picture- and program-related source data can be carried in conjunction with the video signal. Note: There are three classes of video index data based on type and use of the data. Class 1 contains information that is required to know how to use the signal. Class 2 contains heritage information for better usage of the signal. Class 3 contains other information not required to know how to use the signal.
Industry:Telecommunications
A record of all calls originated or received by a switching system. Note: SMDRs are usually generated by a computer.
Industry:Telecommunications
A record of the documents visited during a Web session, which list allows users to access previously visited pages more quickly or to generate a record of a user's progress. Synonym bookmark list, go list, hotlist.
Industry:Telecommunications
A record, within a domain name server, that describes an Internet resource. Note: A resource record consists mainly of a domain name, its type, and a value.
Industry:Telecommunications
A reduction in regulation of (a) tariffs, (b) market entry and exit, and/or (c) facilities in public telecommunication services.
Industry:Telecommunications
A redundancy-reduction technique for facsimile in which a run of consecutive picture elements having the same state (gray scale or color) is encoded into a single code word.
Industry:Telecommunications
A reference optical source to which emitting and detecting devices are compared for calibration purposes. Note: In the United States, recognized standard optical sources must be traceable to the National Institute of Standards and Technology (NIST,) formerly the National Bureau of Standards (NBS. )
Industry:Telecommunications
