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ACCS Automated Calling Card Service
ACD Automatic Call Distributor
ACDA Automatic Call Disposition Analyzer
ACE Automatic Calling Equipment
ACF Advanced Communications Functions
ACH Attempt per Circuit per Hour
ACOF Attendant Control Of Facilities
ACP ACtion Point
ACSNET Acedemic Computing Services NETwork
ACSU Advanced t-1 Channel Service Unit
ACTS Automated Coin Toll Service
ACU Alarm Control Unit
ACU Automatic Calling Unit
ADCCP Advanced Data Communications Control Procedure
ADCI Automatic Display Call Indicator
ADN Abbreviated Dialing Number
ADS Advanced Digital System
ADS Audio Distribution System
ADS Auxilary Data System
AFACTS Automatic FACilities Test System
AFADS Automatic Force Adjustment Data System
AFSK Automatic Frequency Shift Keying
AIC Automatic Intercept Center
AICC Automatic Intercept Communications Controller
AIOD Automatic Identificated Outward Dialing
AIS Automatic Intercept System
ALBO Automatic Line BuildOut
ALFE Analog Line Front End
ALGOL ALGOrhythmic computer Language
ALI Automatic Location Indentification
ALIT Automatic Line Insulation Testing
ALRU Automatic Line Record Update
ALS Automated List Service
AM Administrative Module
AM Amplitude Modulation
AMA Automatic Message Accounting
AMACS AMA Collection System
AMARC AMA Recording Center
AMASE AMA Standard Entry
AMAT AMA Transmitter
AMATPS AMA TeleProcessing System
AMERITECH AMERican Information TECHnologies
AMPS Advanced Mobile Phone Service
AN Associated Number
ANA Automatic Number Announcement
ANC All Number Calling
ANI Automatic Number Identification
ANIF Automatic Number Identification Failure
ANSI American National Standards Institute
AOSS Auxilliary Operator Service System
AP Attached Processor
APC AMARC Protocol Converter
APS Automatic Protection Switch
AR Alarm Report
ARC Audio Response Controller
ARIS Audichron Recorded Information System
ARS Alternate Route Selection
ARSB Automated Repair Service Bureau
ARU Audio Response Unit
ASCII American Standard Code for Information Interchange
ASOC Administrative Service Oversight Center
ASPEN Automatic System for Performance Evaluation of the Network
AT Access Tandem
AT&T American Telephone and Telegraph
ATB All Trunks Busy
ATC Automatic Transmission Control
ATH Abbreviated Trouble History
ATI Automatic Test Inhibit
ATIS Automatic Transmitter Identification System
ATM Automatic Teller Machine
ATMS Automated Trunk Measurement System
ATP All Tests Pass
ATR Alternate Trunk Routing
ATRS Automated Trouble Reporting System
ATTC Automatic Transmission Test and Control circuit
ATTCOM AT&T COMmunications
ATTIS AT&T Information System
AUDIX AUDio Information eXchange
AUTODIN AUTOmatic DIgital Network
AUTOSEVCOM AUTOmatic SEcure Voice COMmunications
AUTOVON AUTOmatic VOice Network
AUXF AUXillary Frame
AVD Alternate Voice Data
B6ZS Bipolar with 6 Zero Subsitution
B911 Basic 911
BAMAF BELLCORE AMA Format
BANCS Bell Administrative Network Communications System
BAPCO Bellsouth Advertising & Publishing COmpany
BCC Blocked Call Cleared
BCD Binary Coded Decimal
BCD Blocked Call Delayed
BCS Batch Change Supplement
BDT Billing Data Transmitter
BEF Band Elimination Filter
BELLCORE BELL COmmunications REsearch
BER Bit Error Rate
BERT Bit Error Rate Test
BETRS Basic Exchange Telecommunications Radio Service
BHC Busy Hour Calls
BISP Business Information System Program