Access: The service provided by our local exchange carriers or alternate access providers, that enables a user to enter a circuit and connect with an interexchange carrier.
Access Channels: Channels set aside by a cable operator for use by third parties, including the public, educational institutions, local governments, and commercial interests unaffiliated with the operator. (see also PEG and LEASED ACCESS).
(ACD) Automatic Call Distributor: A device that is able to distribute incoming calls to a certain group of terminals.
(A/D) Analog to Digital Converter: A device that constantly converts varying analog signals to digital signals.
(ADI) Area of Dominant Influence: A television market as delineated by the Arbitron Company.
Addressable: Capable of being activated or accessed remotely by signals sent from a cable system’s head end (addressable usually refers to descramblers and other set-top boxes).
(ADSL) Asymmetrical Digital Subscriber Line: A modem technology that provides greater bandwidth from ordinary telephone lines. Asymmetrical is able to provide faster one way speed connectivity between the central office and the customer premises.
Aerial Plant: Cable that is suspended above ground on telephone or utility poles.
(AIN) Advanced Intelligent Network: A network architecture that allows major foreign and US telecommunications companies to direct telephone calls based on activating points to the database used in Signaling System 7 (SS7).
Amplifier: A device that boosts the strength of electronic signals.
Analog: A mechanism or method in which data is represented by continuous variable physical quantities and that uses nondiscrete variations in frequency, amplitude or location to carry sounds, signals, mathematical data or other information.
(ANI) Automatic Number Identification: A function by which the directory number of a calling unit is automatically obtained.
(ARPA) Advanced Research Project Agency: An agency of the U.S. Department of Defense that funded the ARPANet as a research network.
Aspect Ratio: The ratio of a television screen’s width to its height (4:3 for NTSC, 16:9 for HDTV).
(AT) Access Tandem: A switching system that provides an interexchange carrier with access to more than one end office.
(ATM) Asynchronous Transfer Mode: A high-speed multiplexing and switching technique that uses fixed size of cells to support several types of traffic such as voice, data and video.
(ATV) Advanced Television: A series of digital television technologies that are designed to improve the current commercial-quality television system.