1-ESS x-ESS series of "Electronic Switching Systems" from AT&T/Lucent 3G Third Generation (Mobile Network) 3GPP Third-Generation Partnership Project 3WC Three Way calling 4GL Fourth-Generation Language 800 or 888 Freephone 802.x Series of LAN standards developed by IEEE 911 Emergency telephone number in North America AAV Alternative Access Vendor ABR Available Bit Rate Access Control, or Alternating Current, or Authentication Center (also AC AUC) ACD Automatic Call Distributor ACE Authentication Encryption ACEK Authentication Encryption Key ACK Acknowledgement ACP Access Control Point ACRE Authorization and Call Routing Equipment ADM Add-Drop Multiplexer (SDH Element) ADPCM Adaptive Differential Pulse Code Modulation ADSL Asymmetric Digital Subscriber Line AGRAS Air-Ground Radiotelephone Automated Service AIOD Automatic Identification of Outward Dialed calls AIN Advanced Intelligent Network (ANSI IN Standard) A-key Authentication key ALI Automatic Location Information AM Amplitude Modulation AMPS Advanced Mobile Phone System ANI Automatic Number Identification ANS Advanced Network Services ANSI American National Standards Institute ANSI-41 ANSI standard for mobile management (ANSI/TIA/EIA-41) ANT ADSL Network Terminator AOA Angle of Arrival AOL America On Line (ISP) API Application Programming Interface APPC Advanced Program-to Program Communications (IBM SNA) APPN Advanced Peer-to-Peer Network (IBM SNA) ARCnet Attached Resource Computer Network (Datapoint) ARDIS Advanced Radio Data Information Service ARP Address Resolution Protocol ARPA Advanced Research Projects Agency ARPU Average Revenue Per User ARPANET ARPA Network ARQ Automatic Repeat Request ARS Automatic Route Selection ASCII American Standard Code for Information Interchange ASIC Application-Specific Integrated Circuit ASN.1 Abstract Syntax Notation 1 (ISO) ASP Application Service Provider ASR Automatic Send Receive, Automatic Speech Recognition AT&T American Telephone & Telegraph ATIS Alliance for Telecommunications Industry Solutions (formerly ECSA) ATM Asynchronous Transfer Mode, Automatic Teller Machine ATSC Advanced Television Systems Committee AUI Attachment Unit Interface AWG American Wire Gauge AXE 10 Series of electronic telephone exchanges from L.M. Ericsson B2B Business-to-Business B2C Business-to-Consumer B8ZS Binary Eight Zero Substitution BACP Bandwidth Allocation Control Protocol BBS Bulletin Board System Bellcore Bell Communications Research, Inc. (Now Telcordia) BEP Back-End Processor BER Bit Error Rate BERT Bit Error Rate Test (or Tester) BIOS Basic Input-Output System B-ISDN Broadband ISDN BOC Bell Operating Company (USA) BONDING Bandwidth On Demand Interoperability Group bps bits per second BRI Basic Rate Interface (ISDN) BS Base Station Base Station Controller, or Binary Synchronous Communications BSC (IBM) BSS Base Station Sub-system (GSM) BSS Business Support Systems BTS Base Transceiver Station CAD Computer-Aided Design CAM Computer-Aided Manufacturing Customized Applications for Mobile-network Enhanced Logic CAMEL (GSM/ETSI) CAN Campus Area Network CANARIE Canadian Network for Advancement of Research, Industry, Education CAP Competitive Access Provider CAPS Common ISDN API Service CARS Cable Antenna Relay Services CASE Computer-Aided Software Engineering CATV Cable Television or Community Antenna Television CAVE Cellular Authentication and Voice Encryption CB Citizens Band CBR Constant Bit Rate CCC Clear Channel Capability CCCH Common Control Channel CCD Charge Coupled Device ComitéConsultatif International des Radiocommunications (now ITU- CCIR R) ComitéConsultatif International des Télégraphes et Téléphones (now CCITT ITU-T) CCR Customer Controlled Reconfiguration CCS Common Channel Signaling CCSS6 Common Channel Signaling System # 6 CD-R Compact Disk-Recordable CD-ROM Compact Disk-Read-Only Memory CDMA Code Division Multiple Access CDO Community Dial Office CDPD Cellular Digital Packet Data CDR Call Detail Record CENTREX Central Office Exchange (PBX-like Service) CEPT Conference of European Posts and Telecommunications CERN Centre Européen de RechercheNucléaire CGSA Cellular Geographic Service Areas CIR Committed Information Rate CLASS Custom Local Area Signaling Services CLEC Competitive Local Exchange Carrier CLI Calling Line Identification CMA Communications Management Association CMIP Common Management Information Protocol (ISO) CMIS Common Management Information Services (ISO) CMISE Common Management Information Service Element (ISO) CMOS Complementary Metal Oxide Semiconductors CMRS Commercial Mobile Radio Service CNET Centre National d'Études en Télécommunications (France Telecom) CNI Calling Number Identification CO Central Office Codec Coder/decoder CON Concentrator COO Cell of Origin CORBA Common Object Request Broker Architecture (OMG) COT Central Office Terminal cPCI Compact Peripheral Component Interconnect CPE Customer Premises Equipment CPN Cisco Powered Network (Ingredient Band) CPP Calling Party Pay CPS Cycles per second (Hertz) CPU Central Processing Unit CRC Cyclic Redundancy Check CRM Customer Relationship Management CSA Carrier Servicing Area CSM Communications Services Management CSMA/CD Carrier Sense Multiple Access with Collision Detection CSR Customer Service Representative CSU Channel Service Unit CT Cordless Telecommunications CTI Computer Telephony Integration CTIA Cellular Telecommunications Industry Association Cu Copper Local Loop CUG Closed User Groups D-AMPS Digital Advanced Mobile Phone Service DA Destination Address DAP Demand Access Protocol DARPA Defense Advanced Research Projects Agency DAT Digital Audio Tape dB deciBel DBMS Database Management System DBS Direct Broadcast Satellite Data Communications Equipment, or Distributed Computing DCE Environment DCU Distribution and Control Unit DDD Direct Distance Dialing DDS Dataphone Digital Service DECT Digital Enhanced (formerly, European) Cordless Telecommunication DES Data Encryption Standard DLCS Digital Loop Carrier System DLL Dynamic Link Library DLU Digital Line Unit DM Distributed Management DME Distributed Management Environment (OSF) DMI Distributed Management Interface Digital Multiplex Switch (Nortel Networks Switching Product Family DMS DMS 100, 200, «) DMT Discrete Multitone DMTF Desktop Management Task Force DNA Digital Network Architecture (Digital Equipment Corporation) DNS Domain Name Service DoD Department of Defense (USA) DOS Disk Operating System DOV Data Over Voice DPCM Differential Pulse Code Modulator DS Digital Service, Digital Signal DS-0 Digital Signal, Level 0 (64 kbps) DS-1 Digital Signal, Level 1 (1.544 Mbps) DS-1C Digital Signal, Level 1C (3.152 Mbps) DS-2 Digital Signal, Level 2 (6.312 Mbps) DS-3 Digital Signal, Level 3 (44.736 Mbps) DS-4 Digital Signal, Level 4 (274.176 Mbps) DSI Digital Speech Interpolation DSL Digital Subscriber Line DSP Digital Signal Processor DSS Decision Support System DSU Digital Service Unit DTAM Document Transfer and Manipulation (ISO) DTE Data Terminal Equipment DTMF Dual-Tone MultiFrequency DTU Data Transfer Unit DTV Digital Television DVB Digital Video Broadcasting DWDM Dense Wavelength Division Multiplexing DXI Data Exchange Interface E2E End-to-End E-911 Enhanced emergency telephone number (USA) E&M Ear and Mouth, or recEive and transMit (signaling) E-TDMA Expanded Time Division Multiple Access EAI Enterprise Application Integration EBCDIC Extended Binary Coded Decimal Interchange Code (IBM) EC European Community ECMA European Community Manufacturers Association ECSA Exchange Carrier Standards Association (now ATIS) EDGE Enhanced Data for GSM Evolution EDI Electronic Data Interchange EEROM Electronically Erasable Read-Only Memory EF&I Engineering, Furnishing and Installation EFT Electronic Funds Transfer EHF Extremely High Frequency (more than 30 GHz) EIA Electronic Industries Association EIR Equipment Identity Register EISA Extended Industry Standard Architecture EMEA Europe, Middle East & Africa (Business Region) EML/EMS Element Management Layer/ Element Management Service EMS Enhanced Messaging Services ENS Enhanced Network Services EOT End of Transmission EPI External Provisioning Interface ERMES European Radio Message System (standard for pagers) ERP Enterprise Resource Management ESCON Enterprise System Connection (IBM) ESMR Enhanced Specialized Mobile Radio ETSI European Telecommunications Standard Institute EU European Union FASB Financial Accounting Standards Board (USA) FAT File Allocation Table FC Frame Control, or Fiber Channel FCAPS Fault, Configuration, Accounts, Performance, Security (ISO) FCC Federal Communications Commission (USA) FCS Frame Check Sequence FDD Frequency Division Duplex FDDI Fiber Distributed Data Interface FDIC Federal Deposit Insurance Corporation (USA) FDMMA Frequency Division Multiplexing Multiple Access FEP Front-End Processor FHSS Frequency Hopping Spread Spectrum FIFO First-In First-Out FITL Fiber In The Loop FM Frequency Modulation FMS Fraud Management System FO Fiber Optic FOD Fax on Demand FR Frame Relay FRAD Frame Relay Access Device, or Assembler/ Disassembler FRS Family Radio Service FSK Frequency-Shift Keying FSS Fixed Satellite System FTAM File Transfer, Access, and Manipulation (ISO) FT1 Fractional T1 FTP File Transfer Protocol (TCP/IP) FTS Federal Telecommunications System FTTB Fiber To The Building FTTC Fiber To The Curb FTTK Fibre To The Kerb FTTH Fiber To The Home FWA Fixed Wireless Access GAN Global Area Network GATT General Agreement on Tariffs and Trade Gb gigabit GB gigabyte GDS Generic Digital Services GEO Geostationary-Earth-Orbit