- 産業: 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 flat, circular, plastic disk coated with material on which bits may be stored in the form of highly reflective areas and significantly less reflective areas, from which the stored data may be read when illuminated with a narrow-beam source, such as a laser diode. Note: The bits are stored sequentially on a continuous spiral track.
Industry:Telecommunications
A flat, circular, rigid plate with a magnetizable surface on one or both sides of which data can be stored. Note: A hard disk is distinguished from a diskette by virtue of the fact that it is rigid. Early in the development of computer technology, hard disks, often multiple disks mounted on a common spindle, were interchangeable and removable from their drives, which were separate from the processor chassis. This technology is still in use, especially in conjunction with large mainframe computers, but physically smaller computers use hard disks that are in sealed units, along with their control electronics and read/write heads. The sealed units are usually installed permanently in the same chassis that contains the processor.
Industry:Telecommunications
A flexible insulated wire used in field telephone and telegraph systems. Note 1: WD-1 and WF-16 are types of field wire. Note 2: Field wire usually contains conductors and high-tensile-strength strands serving as strength members.
Industry:Telecommunications
A flexible rod antenna, usually between 1/10 and 5/8 wavelength long, supported on a base insulator.
Industry:Telecommunications
A foreign object present within, for example, an optical fiber or a crystal.
Industry:Telecommunications
A form of amplitude-modulation in which the carrier is transmitted at a controlled level below that which is required for demodulation, but at a level sufficient to serve as a frequency reference.
Industry:Telecommunications
A form of binary telegraph transmission in which positive and negative direct currents denote the significant conditions. Synonym double-current transmission.
Industry:Telecommunications
A form of common-channel signaling where the signaling channel serves one or more trunk groups, at least one of which terminates at a point other than the signal transfer point at which the signaling channel terminates.
Industry:Telecommunications
A form of diphase modulation, combined with signal conditioning, that (a) eliminates the dc component of the signal, (b) enhances timing recovery, and (c) facilitates transmission over voice frequency (VF) circuits or coaxial cables.
Industry:Telecommunications
A form of electronic messaging in which addressed messages or files are entered by users into a computer or network of computers. Note: Other users may obtain, at their convenience and request, messages or files available to them. Synonym electronic bulletin board.
Industry:Telecommunications
