- Отрасли: 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.
In certain materials, the increase in electrical conductivity that results from increases in the number of free carriers generated when photons are absorbed. Note: The photons must have quantum energy sufficient to overcome the band-gap in the material in question.
Industry:Telecommunications
In certain materials, the changes in the electrical characteristics caused by photon absorption.
Industry:Telecommunications
In certain local-area-network protocols, a group of bits that serves as a symbol of authority, is passed among data stations, and is used to indicate the station that is temporarily in control of the transmission medium.
Industry:Telecommunications
In cellular technology (mobile telephone technology,) the use of a wireless telephone outside a specified tariffed geographic area defined by the service provider (which area is usually called the "home" area); outside of the home area, additional charges usually apply.
Industry:Telecommunications
In cellular mobile, the geographical area covered by the smaller of: a base station, or a subsystem (sector antenna) of that base station corresponding to a specific logical identification on the radio path. Note: Mobile stations in a cell may be reached by the corresponding radio equipment of the base station. 2. The service area of an individual transmitter location in a cellular system. 3. In communications, a string that contains a header and user information. Note 1: A cell is dedicated to one user for one session. Cells for a given system are usually of fixed length and smaller than a frame, such as 424 bits for a cell, compared to 1024 for a frame. Note 2: In asynchronous transfer mode (ATM) systems, a cell consists of 53 bytes, i.e., a 5-byte header field and a 48-byte information field. Note 3: A cell does not have error-correction capability and is therefore suited for low-BER communications systems, such as digital fiber optic systems. 4. In OSI, a fixed-length block labeled at the Physical Layer of the Open Systems Interconnection--Reference Model (OSI--RM. ) 5. In computer systems, an addressable, internal hardware location. 5. In computer applications, a single location on a spreadsheet.
Industry:Telecommunications
In cellular mobile systems, the process of transferring a phone call in progress from one cell transmitter and receiver and frequency pair to another cell transmitter and receiver using a different frequency pair without interruption of the call. Synonym handover. 2. In satellite communications, the process of transferring ground-station control responsibility from one ground station to another without loss or interruption of service.
Industry:Telecommunications
In CATV systems, a bidirectional high-speed digital communications interface, located on a subscriber's or user's premises, and used, for example, for Internet access or other digital communications.
Industry:Telecommunications
In carrier telephone transmission, equipment that accepts the signal from a group receiver output and attenuates it to the proper signal level for insertion, without frequency translation, at the input of a group transmitter.
Industry:Telecommunications
In carrier telephone transmission, equipment that accepts the multiplexed signal from a supergroup receiver output, amplifies it without frequency translation, and provides the proper signal level to the input of a supergroup transmitter equipment.
Industry:Telecommunications
In carrier sense multiple access with collision avoidance (CSMA/CA) networks and in carrier sense multiple access with collision detection (CSMA/CD) networks, the algorithm used to schedule retransmission after a collision such that the retransmission is delayed by an amount of time derived from the slot time and the number of attempts to retransmit.
Industry:Telecommunications
