A

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
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