A
 | AAL ATM Adaptation Layer
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| ABM Asynchronous Balanced Mode
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| ABR Available Bit Rate
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| ABS Automatic Backup System
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| ACD Automatic Call Distribution A phone system that transfers an incoming call to the agent at the beginning of a queue |
| ACDR |
Audio Compact Recording Player
A home jukebox that can play MP3files, music, records and organize tracks digitaly on CD & CDR's
| ACK Acknowledge A term used in communications starting with the handshake
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| ACL Access Control List
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| ACL Audit Control Language
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| ACL Asynchronous Connection Less link
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| ACO Authentification Ciphering Offset
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| ACP Adjacent Channel Power
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| ACR Allowed Cell Rate Term used in connection with ATM
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| ADC Analogue to Digital Converter Converts analogue to digital
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| ADCCP |
Advanced Data Communications Control Protocol
| ADI |
Area of Dominant Influence
| ADM |
Add Drop Multiplexor
| ADP |
Automated Data Processing
| ADPCMAdvanced Differential Pulse Code Modulation
Method of voice compression
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| ADRAdvanced Digital Recording
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| ADSIAnalogue Display Services Interface
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| ADSLAsymmetrical Digital Subscriber Line
A telephone line with uneven transmission rates; half the transmissions can attain speeds up to 640kbps while the other half can attain speeds of 1.544 Mbps or greater in the opposite direction.
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| ADTAdvanced Data Type
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| ADXAutomatic Data eXchange
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| AFCAutomatic Frequency Control
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| AFCAnti Ferromagnetically Coupled
Type of magnetic recording media with Ruthenium applied between surface of disk between two layers
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| AFEAdvanced Function Engines
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| AFTAutomatic Fine Tuning
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| AGCAutomatic Gain Control
Algorithm to normalise volume regardless of speakers position to microphone
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| AGPAccelerated Graphics Port
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| AHAuthentification Header
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| AHIPAuthentification Header Internet Protocol
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| AIArtificial Intelligence
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| AIDApplication IDentifier
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| AIFFAudio Interchange File Format
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| AIIActive Input Interface
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| AINAdvanced Intelligent Network
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| AISAlarm Indicating Signal
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| AITAdvanced Intelligent Tape
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| AIXIBM version of Unix operating system
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| ALCAutomatic Level Control
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| ALIAutomatic Location Identifier
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| ALSCAutomatic Level and Slope Control
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| ALUArithmetic Logic Unit
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| AM Amplitude Modulation
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| AME Advanced Metal Evaporated
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| AML Amplitude Modulated Link
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| AMPS Advanced Mobile Phone Service The analogue wireless transmission standard deployed during the 1980's in the US.
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| ANI Automatic Number Identification
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| ANS Automatic Noise Suppression Reduces background noise from audio signal
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| ANSI American National Standards Institute Sets standards. Similar to ISO
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| AOI Active Output Interface
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| AOS Alternative Operator Service
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| APDU Application Protocol Data Unit
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| API Application Program Interface A language and message format used by an application program to communicate with an operating system or other system program.
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| APIPA Automatic Private Internet Protocol Addressing
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| APL Automatic Picture Level
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| APM Advanced Power Management
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| APS Advanced Photo System
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| APS Automatic Protection Switching
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| ARM Asynchronous Response Mode
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| ARP Address Resolution Protocol Used to map an IP address to a physical hardware address
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| ARPU Average Revenue Per User
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| ARQ Automatic Repeat reQuest
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| ARU Audio Response Unit
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| ASC Automatic Slope Control
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| ASCII American Standard Code for Information Interchange A code for representing English characters as numbers. Enables transfer of text from one computer to another.
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| ASF Advanced Streaming Format
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| ASGC Automatic Slope and Gain Control
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| ASIC Application Specific Integrated Circuit An integrated chip used for specific usage as opposed to generic
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| ASK Apmlitude Shifting Key
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| ASP Application Server Provider Business to business provider of services such as software hosting
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| ASP Active Server Pages Dynamic web pages combining ActiveX and HTML
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| ATCommonly referred to as the IBM clone, the AT was
the replacement for the XT 8088
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| ATAPI Advanced Technology Attachment Packet Interface Standard defining the device characteristics for IDE
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| ATCAbsolute Time Command
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| ATD Asynchronous Time Division
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| ATE ATM Terminating Equipment
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| ATEL Advanced TElevision Laboratory
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| ATIS Alliance for Telecommunications Industry Solutions
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| ATL Automated Tape Library A mechanism used to archive, store and retrieve data.
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| ATM Asynchronous Transfer Mode A high speed cell switching network technology that handles data and real-time voice and video.
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| ATM Automated Teller Machine Commonly referred to a the "hole in the wall". A unit which allows user interface with centrally held, financial data over a network.
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| ATSAbsolute Time Sequence
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| ATSC Advanced Television Systems Committe
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| ATV Advanced TeleVision
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| AUI Attachment Unit Interface Used in connection with "thick" ethernet
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| AV Audio Visual
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| AV Anti Virus
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| AVI Audio Video Interleaved Digital video and audio files for windows |