A [(interface BSS-MSC (GSM)] AAA Authentication, Authorization and Accounting (IETF) AAL ATM Adaptation Layer (protocolli di incapsulamento dati) AAR Automatic Alternate Routing AAV Alternative Access Vendor ABB Application Building Block Abis [interface BTS-BSC (GSM)] ABM Asynchronous Balanced Mode ABR Available Bit Rate AC Authentication Centre (GSM) ACA Adaptive Channel Allocation (MAC) ACD Automatic Call Distribution ACELP Algebraic Code Excited Linear Predictive compression ACK ACKnowledgement ACL Agent Command Language ACS Asian Cellular Satellite ACS ATM Circuit Steering ACTS Advanced Communication Technologies and Services ADC Analog-to-Digital Converter ADCCP Advanced Data Communications Control Procedure ADI Area of Dominant Influence ADM Adaptive Delta Modulation ADM Add-Drop Multiplexing (SDH) ADPCM Adaptive Differential Pulse-Code Modulation ADSI Analogue Display Services Interface ADSL Asymmetric Digital Subscriber Line ADT Admission, Discharge, and Transfer AFC Automatic Frequency Control AGC Automatic Gain Control AGCH Access Grant CHannel (GSM) A-GPS Assisted GPS AHP Analytic Hierarchy Process AIMN Advanced Intelligent Mobile Network AIN Advanced Intelligent Network AIOD Automatically Identifying Outward Dialing ALASCOM ALASkan COMmunications satellite corporation ALJ Administrative Law Judge ALT Alternative Local Transport ALU Arithmetic-Logic Unit AM Access Manager AM Amplitude Modulation AMA Automatic Message Accounting AMI Alternate Mark Inversion AMI Alterned Mark Inversion AMIS Audio Messaging Interchange Specification AMPS Advanced Mobile Phone Service (USA) AMR Adaptive MultiRate AMSC American Mobile Satellite Corporation ANI Automatic Number Identification ANSI American National Standards Institute AOA Angle Of Arrival AOS Alternate Operator Service AP Access Port APCM Adaptive Pulse Code Modulation API Application Programming Interface APMS Asian Pacific Mobile Satellite APPC Advanced Peer-to-Peer Communications APSI Alliance to Promote Software Innovation ARABSAT Arabian Satellite Consortium ARDIS Advanced Radio Data Information Service ARFA Assisted Receive Frame Acquisition ARM Asynchronous Response Mode ARP Address Resolution Protocol (IP) ARPAnet Advanced Research Projects Agency Network ARQ Automatic Retransmission on reQuest ARS Automatic Route Selection ARTEMIS Advanced Research Testbed for Medical Informatics ASC Afro-Asian Satellite Communications ASCII American Standard Code for Information Interchange ASIC Application-Specific Integrated Circuit ASK Amplitude Shift Keying ASN.1 Abstract Syntax Notation One AT&T American Telephone and Telegraph Corporation ATB All Trunks Busy ATM Asynchronous Transfer Mode ATM Automated Teller Machine AUG Administrative Unit Group (SDH) AUI Attachment Unit Interface (ethernet) AVI Audio Video Interlaced AVJ Adaptive Virtual Junction AVK Audio Video Kernel AVSS Audio/Video SubSystem AVT Audio-Video Transport (IETF) AWA Advanced Wireless Access AWG American Wire Gauge AWGN Additive White Gaussian Noise