\\ More than 3500 Telecom abbreviations maintained by Ioan (Nini) Indreias // 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y All words A-bis Interface between the BSC and BTS in a GSM network A-TDMA Advanced Time Division Multiple Access A51/2/3/8X Encryption algorithms for GSM networks AA Administrative Authority AA Allocation Area AA Auto Answer AAA Authentication, Authorisation, and Accounting (OAM) AAB Automatic Answer Back AAC Alternate Access Carrier AAD Auditory Assistance Device AAL ATM Adaptation Layer AAP Alternate Access Provider AAR Automatic Alternate Routing AAR Automatic Alternative Routing AARP AppleTalk Address Resolution Protocol AAV Alternate Access Vendors AB Access Burst ABEND Abnormal end ABM Accunet Bandwidth Manager ABM Asynchronous Balanced Mode (HDLC) ABME ABM Extended ABR Area Border Router ABR Available Bit Rate (ATM) ABRD Automatic Baud Rate Detection ABS Alternate Billing Service ABS Alternative Billing Services ABS Application Bridge Server ABS Average Busy Stream ABSBH Average Busy Season Busy Hour (telephony) AC Access Connections AC Access Control (Token Ring, FDDI) AC Alternating Current AC Authentication Center ACA Asyncronous Communication Adapter ACB Annoyance Call Bureau ACC ANSI C++ Compiler ACCH Associated Control Channel (GSM) ACD Automatic Call Distribution/Distributor ACELP Algebraic Code Excited Linear Prediction ACF Access Control Field (DQDB) ACF Access Coordination Function ACF Advanced Communication(s) Function ACFA Advanced CMOS Frame Aligner ACG Automatic Call Gapping ACG Automatic Code Gapping ACI Answer Controller Interface ACIA Asyncronous Communications Interface Adapter ACK ACKnowledgement ACK Acknowledgment (DDCMP, BISYNC) ACL Access Control List ACM Address Complete Message (SS7) ACN Access Carrier Name ACN Advanced Communication Network ACN Application Context Name ACNA Automated Customer/Carrier Name and Address ACO Automatic Cut Off ACP Access/Action Control Point ACPI Advanced Configuration and Power Interface ACR Allowed Cell Rate ACR Anonymous Call Rejection ACR Automatic Call Routing ACS Asynchronous Communications Server ACSE Association Control Service Element (Application Layer) ACT Applied Computer Telephony ACTA America's Carriers Telecommunications Association ACTE Approvals Committee for Terminal Equipment ACTLU Activate Logical Unit (SNA) ACTPU Activate Physical Unit (SNA) ACTS Advanced Communications Technologies and Services ACTS Advanced Communications Technology Satellite ACTS Automatic Coin Telephone System ACU Alarm Control Unit ACU Antenna Combining Unit ACU Array Configuration Utility ACU Auto Callback Unit ACU Automatic Calling Unit ACUTA Association of College & University Telecommunications Administrators AD Administrative Domain ADAD Automatic Dialing-Announcing Device ADC Analog to Digital Converter ADCCP Advanced Data Communications Control Protocol (ANSI) ADD Automatic Dialing Device ADF Adapter Description File ADL Additional Directory Listing ADM Add/Drop Multiplexer ADMA Advanced DMA controller ADMD Administration Management Domain ADN Advanced Digital Network ADNS Advanced Data Network Solutions ADP Automatic Data Processing ADPCM Adapted Differential Pulse Code Modulation ADPCM Adaptive Differential PCM ADPCM Adaptive Digital PCM ADS-AIT Ameritech Advanced Data Services ADS Abstract Data Structure ADS Associated Directory Services ADSI Analog Display Services Interface ADSL Asymmetrical Digital Subscriber Line ADSP AppleTalk Data Stream Protocol ADSS All Dielectric Self-Supporting ADSU ATM DSU ADTS Automated Digital Terminal Systems AE Application Entity (GSM) AEP AppleTalk Echo Protocol AERM Alignment Error Rate Monitor AERM Alignment Error Rate Monitor (SS7) AF Audio Frequency AFC Automatic Frequency Control AFE Analog Front End AFI Authority and Format Identifier (ISO) AFP AppleTalk Filing Protocol AFPS Automatic Facility Protection Switching AFR Automatic Flexible Routing AFS Andrew File System AFSK Audio Frequency Shift Keying AGC Automatic Gain Control AGCH Access Grant Channel (GSM) AGND Analog Ground AGW Access Gateway AH Authentication Header AHT Average Handle Time AHT Average Hold Time AI Access Interface AI Artificial Intellegence AIM Asynchronous Interface Module AIN Advanced Intelligent Network AIN Advanced Intelligent Network (SS7) AIO Asynchronous Input/Output AIOD Automatic Identification of Outward Dialing AIP ATM Interface Processor (Cisco) AIRS Alarm Identification Reporting System (Harris) AIS-L Alarm Indication Signal-Line AIS-P Alarm Indication Signal-Path AIS-V Alarm Indication Signal-Virtual AIS Alarm Indication Signal (GSM) AIS Automatic Intercept System AIU Analog Interface Unit AIX Advanced Interactive Executive (IBM's Version of UNIX Operating System) ALI Address Location Information ALI Automatic Location Information ALIS Automatic Location Identification System ALIT Automatic Line Insulation Test ALJ Administrative Law Judge ALPS Airline Product Set (Cisco) ALPS Automatic Loop Protection Switching ALTS Alternate Local Transport Services ALU Arithmetic Logic Unit AM Active Monitor AM Administrative Module (AT&T 5ESS) AM Amplitude Modulation AMA Automatic Message Accounting AMACC Automatic Message Accounting Control Center AMADNS AMA Data Networking System AMATPS AMA Teleprocessing System AMD Advanced Micro Devices, Inc. AMI Alternate Mark Inversion AMI Alternative Mark Inversion AMIS Audio Messaging Interchange Specification AMLCD Active Matrix Liquid Crystal Display AMOS Access Mechanized Order System AMP Active Monitor Present (Token Ring) AMP Administrative Module Processor AMP AIN Maintenance Parameter AMPS Advanced Mobile Phone Service/System AMR Adaptive Multi-Rate codec AMRL Adjusted Main Ring Length AN Access Number ANC Access Network Controller ANI Automatic Number Identification ANI Automatic Number Identification (ISDN) ANM Ameritech Network Management ANM Answer Message ANP Automatic Numbering Plan ANR Automatic Network Routing ANS Advanced Network Systems ANSI American National Standards Institute ANVM Active Nonvolatile Memory ANW Advanced Netware AOA Angle Of Arrival AOC Advice Of Charge AoCC Advice of Charge Charging AoCI Advice of Charge Indication AOL America OnLine AON All Optical Network AOS Alternative Operator Services AP Access Point AP Access Provider AP Action Point AP Activation Platform AP Adjunct Processor AP Application Processor/Process/Program APA All Points Addressable APA Auto Port Aggregation APAD Asynchronous Packet Assembler/Disassembler APaRT Automated Packet Recognition/Translation (Cisco) APC Adjacent Point Code APD Avalanche Photo Diode APDU Application Protocol Data Unit API Application Program/Programming Interface APL Analog Private Line APN Access Point Name APNIC Asia Pacific Network Information Center APP Applications Portability Profile APPC Advanced Program-to-Program Communication (IBM) APPC Advanced Program-to-Program Communications APPN+ Next-generation APPN APPN Advanced Peer-to-Peer Networking (IBM) APR Alarm Processing Remote APS Automatic Protection Switching APSB Automatic Protection Switching Byte APT Telephony Applications System APTOS Automated Pricing, Terminals Operations & Services APTT Automatic Progression Trunk Testing APZ Telephony Control System AQL Acceptable Quality Level AR Access Registrar ARA AppleTalk Remote Access ARC ATM Research Consortium ARCnet Attached Resource Computer Network ARCOFI Audio Ringing Codec Filter ARCOS ARCOFI Coefficient Support Program ARD Automatic Ring Down ARE All Routes Explorer (Source Routing) ARFCN Absolute Radio Frequency Channel Number (GSM - UMTS) ARIB Association of Radio Industries and Businesses ARIN American Registry for Internet Numbers ARJ Admissions Reject (RAS) ARL Adjusted Ring Length ARM Asynchronous Response Mode (HDLC) ARP Address Resolution Protocol ARP Address Resolution Protocol (IETF) ARPA Advanced Research Project Agency ARPA Advanced Research Projects Agency ARPANET Advanced Research Projects Agency Network ARPU Average Revenue Per User ARQ Admissions Request (RAS) ARQ Automatic Repeat reQuest ARS Automatic Route Selection ARSB Automated Repair Service Bureau ARU Alarm Relay Unit ARU Automatic Response Unit ARU Audio Response Unit AS56 Accunet Switched 56 AS Autonomous System ASA Authorized Sales Agent ASA Average Speed of Answer ASAI Adjunct Switch Application Interface ASAM ATM Subscriber Access Multiplexer ASB Application Specific Bits ASBR Autonomous System Boundary Router ASC AIN Switch Capabilities ASCII American Standard Code for Information Interexchange ASCII American Standard Code for Information Interexchange (ANSI) ASCU Agent-Set Control Unit ASD Automated Software Distribution ASDS ACCUNET Spectrum of Digital Services (AT&T) ASE Amplified Spontaneous Emissions ASE Application Service Element (GSM) ASF Abstract Specification File ASI Alternate Space Inversion ASI ATM Service Interface ASIC Application Specific Integrated Circuit ASIP AlphaServer Intelligent Peripheral ASK Amplitude Shift Keying ASN.1 Abstract Syntax Notation One (ITU-T) ASN Abstract Syntax Notation (ITU-T) ASN Abstract System Notation ASN Auxiliary Signal Network ASP Active Server Pages ASP Advanced Speech Processor ASP AppleTalk Session Protocol ASP Application Service Provider ASP Assignment Source Point ASP Auxiliary Signal Path ASPI Advanced SCSI Programming Interface ASR Access Service Request ASR Answer-Seizure Ratio ASR Automatic Server Recovery (HP) ASR Automatic Speech Recognition AST Automatic Spanning Tree ASYNCH ASYNCHronous AT&T American Telephone and Telegraph Company AT Access Tandem switch AT Advanced Technology ATA Analogue Telephone Adapter ATAB Area Trunk Assignment Bureau ATB All Trunks Busy ATCP AppleTalk Control Protocol ATDM Asynchronous Time Division Multiplexing ATG Address Translation Gateway (Cisco) ATH Attention Hangup ATI Any Time Interrogation (GSM - UMTS) ATIS Alliance for Telecommunications Industry Solution ATM-LI ATM Link Identifier ATM-PCI ATM Protocol Control Information ATM-SDU ATM Service Data Unit ATM Asynchronous Transfer Mode ATM Automatic Teller Machine ATMM ATM Layer Management ATN Access Tandem Network ATP Acceptance Test Procedure ATP ALPS Tunneling Protocol. ATP AppleTalk Transaction Protocol ATP Application Transaction Programs ATS Advanced Telecommunications Services ATSC American Television Systems Committee ATSC Australian Telecommunication Standardization Committee ATU-C ADSL Transceiver Unit-Central office end ATU-R ADSL Transceiver Unit-Remote terminal end AU Access Unit AUC Authentication Center AUI Attachment Unit Interface AUI Attachment User Interface AUP Acceptable Use Policy AURP AppleTalk Update-based Routing Protocol AUSM ATM User Service Module AUX Apple UNIX AVBO Advanced Voice Busyout AVD Alternate Voice Data AVM ATM Voice Multiplexer AVR Automatic Voltage Regulator AVRU Automated Voice Response Unit AW Admin Workstation AW Administrative Weight AWG American Wire Gauge SMBZ - SaMBoZaur - test for propagation of define: