AAL

ATM Adaptation Layer

AAS

Automated Auction System (FCC)

ABATS

Automated Bit-Access Test System

ABM

Accunet Bandwidth Manager (AT&T)

ABR

Available Bit Rate

AC

Access Control, Address Copied, Alternating Current, Authentication Center

ACD

Automatic Call Distributor

ACELP

Algebraic Code-Excited Linear Predictive

ACP

Access-Control Point

ADA

Americans with Disabilities Act

ADCR

Alternate-Destination Call Routing (AT&T)

ADM

Add-Drop Multiplexer

ADN

Advanced Digital Network (Pacific Bell)

ADPCM

Adaptive Differential Pulse Code Modulation

ADSL

Asymmetrical Digital Subscriber Line

AFP

Apple File Protocol

AGRAS

Air-Ground Radiotelephone Automated Service

AIODC

Automatic Identification of Outward Dialed Calls

AIN

Advanced Intelligent Network

ALI

Automatic Location Information

AM

Amplitude Modulation

AMPS

Advanced Mobile-Phone Service

ANI

Automatic Number Identification

ANR

Automatic Network Routing (IBM Corporation)

ANSI

American National Standards Institute

ANT

ADSL Network Terminator

AOL

America Online

APC

Access-Protection Capability (AT&T)

API

Application Programming Interface

APPC

Advanced Program-to-Program Communications (IBM Corporation)

APPN

Advanced Peer-to-Peer Network (IBM Corporation)

APC

Automatic Protection Switching

ARCnet

Attached Resource Computer Network (Datapoint Corporation)

ARB

Adaptive Rate Based (IBM Corporation)

ARP

Address-Resolution Protocol

ARPA

Advanced Research Projects Agency

ARQ

Automatic Repeat Request

ARS

Action-Request System (Remedy Systems, Inc.)

AS

Autonomous System

ASCII

American Standard Code for Information Interchange

ASIC

Application-Specific Integrated Circuit

ASN.1

Abstract Syntax Notation 1

ASP

Application Service Provider

ASTN

Alternate Signaling Transport Network (AT&T)

AT&T

American Telephone and Telegraph

ATIS

Alliance for Telecommunications Industry Solutions (formerly, ECSA)

ATM

Asynchronous Transfer Mode

ATSC

Advanced Television Systems Committee

ATT

Auction-Tracking Tool (FCC)

AUI

Attachment Unit Interface

AWG