Acronyms

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#

  • 10GigE - 10 Gigabit Ethernet
  • 128QAM - One Hundred Twenty Eight Phase Quadrature Amplitude Modulation
  • 16QAM - Sixteen Phase Quadrature Amplitude Modulation
  • 1FB - Single Flat-rate Business (telephony)
  • 1G - First Generation Wireless
  • 1MB - Single Message-rate Business (telephony)
  • 1xRTT - One times Radio Transmission Technology
  • 256QAM - Two Hundred Fifty Six Phase Quadrature Amplitude Modulation
  • 2B1Q - Two Binary One Quaternary
  • 2F-BLSR - Two-Fiber Bidirectional Line Switched Ring
  • 2G - Second Generation
  • 3DES - Triple Data Encryption Standard
  • 3G - Third Generation
  • 3GPP - Third Generation Partnership Project
  • 3GPP2 - Third Generation Partnership Project 2
  • 3xRTT - Three times Radion Transmission Technology
  • 4B5B - Four Bits Five Bits
  • 4F-BLSR - Four-Fiber Bidirectional Line Switched Ring
  • 4G - Fourth Generation
  • 64QAM - Sixty-Four Phase Quadrature Amplitude Modulation
  • 8-PSK - Eight Phase Shift Keying

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A

  • A/D - Analog-to-Digital
  • AA - Authenticaton and Authorization
  • AAA - Authentication, Authorization, and Accounting
  • AAC - Advanced Audio Coding
  • AAHOA - Asian American Hospitality Owner's Association
  • AAL - ATM Adaptation Layer
  • AAL1 - ATM Adaptation Layer Type 1
  • AAL2 - ATM Adaptation Layer Type 2
  • AAL5 - ATM Adaptation Layer Type 5
  • ABC - American Broadcasting Company
  • ABS - Alternate Billing Service
  • ABR - Available Bit Rate
  • AC - air Conditioning
  • AC - Alternating Current
  • AC - Authentication Center
  • AC-3 - Audio Coding 3
  • ACD - Automatic Call Distributor
  • ADCCP - Advanced Data Communication Control Procedures
  • ADM - Add/Drop Multiplexer
  • ADPCM - Adaptive Pulse Code Modulation
  • A-DSG - Advanced-Mode DOCSIS Set-Top Gateway
  • ADSL - Asymmetric Digital Subscriber Line
  • ADSL2 - Asymmetric Digital Subscriber Line 2
  • AES - Advanced Encryption Standard
  • AES - Audio Engineering Society
  • AF - Assured Forwarding
  • AfriNIC - African Network Information Centre
  • AFSK - Audio Frequency Shift Keying
  • AGM - Absorbed Glass Mat (battery)
  • AH - Authentication Header
  • AIN - Advanced Intelligent Network
  • AJAX - Asynchronous JavaScript and XML
  • ALI - Automatic Location Identification
  • AM - Amplitude Modulation
  • AMI - Alternate Mark Inversion
  • AMP - Active Monitor Present (Token Ring)
  • AMP - Administrative Module Processor
  • AMPS - Analog Mobile Phone System
  • ANI - Automatic Number Identification
  • ANS - American National Standard
  • ANSI - American National Standards Institute
  • AOL - America OnLine
  • AP - Application Program
  • AP - Access Point (wireless networks)
  • APC - Angled Physical Contact
  • API - Application Programming Interface
  • APIPA - Automatic Private Internet Protocol Addressing
  • APNIC - Asia Pacific Network Information Centre
  • ARIN - American Registry for Internet Numbers
  • ARP - Address Resolution Protocol
  • ARPA - Address and Routing Parameter Area
  • ARPA - Advanced Research Projects Agency
  • ARPANET - Advanced Research Projects Agency Network
  • ARPU - Average Revenue per User
  • AS - Application Server
  • AS - Autonomous System
  • ASCAP - American Society of Composers, Authors, & Publishers
  • ASCII - American Standard Code for Information Interchange
  • ASI - Asynchronous Serial Interface (television)
  • ASK - Amplitude Shift Keying
  • ASN.1 - Abstract Syntax Notation One
  • ASP - Application Service Provider
  • ASP - Active Server Pages
  • ASTN - Automatic Switched Transport Network
  • ATS - Automatic Transfer Switch
  • AT&T - American Telephone and Telegraph (originally)
  • ATDN - AOL Transit Data Network
  • ATM - Asynchronous Transfer Mode
  • ATSC - Advanced Television System Committee
  • ATIS - Alliance for Telecommunications Industry Solutions
  • AVP - Attribute-Value Pair (used in describing protocols)

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B

  • B-ISDN - Broadband Integrated Services Digital Network
  • B&W - Black & White
  • B2B - Business-to-Business
  • B8ZS - Binary Eight Zero Substitution
  • BC - Business Class
  • BCE - Business Class Ethernet
  • BCP - Business Class Phone
  • BCP - Business Continuity Plan(ning)
  • BDCBB - Battery Distibution Circuit Breaker Bay
  • BDFB - Battery Distribution Fuse Bay
  • BECN - Backward Explicit Congestion Notification
  • BER - Bit Error Rate
  • BFSK - Binary Frequency Shift Keying
  • BGCF - Breakout Gateway Control Function
  • BGP - Border Gateway Protocol
  • BH - Busy Hour (telephony)
  • BIA - Business impact analysis (or Business Impact Assessment)
  • BISYNC - Binary Synchronous Communication
  • Bit - Binary Digit
  • BITS - Building Integrated Timing Supply
  • BLSR - Biductional Line Switched Ring
  • BMI - Broadcast Music Incorporated
  • BMP - Bitmap
  • BOC - Bell Operating Company
  • BOOTP - Bootstrap Protocol
  • BPDU - Bridge Protocol Data Unit
  • BPON - Broadband Passive Optical Network
  • BPRZ - Bipolar Return to Zero
  • bps - Bits per second
  • BPSK - Binary Phase Shift Keying (or Bi-Phase Shift Keying)
  • BRI - Basic Rate Interface
  • BS - Base Station
  • BSC - Base Station Control
  • BSkyB - British Sky Broadcasting
  • BSS - Base Station Subsystem
  • BSS - Business Support System
  • BSA - Basic Service Arrangement
  • BTS - Base Transceiver Station
  • BTU - British Thermal Unit
  • BV16 - BroadVoice 16

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C

  • CA - Certificate Authority
  • CA - Computer Associates
  • CAC - Connection Admission Control
  • CAD - Computer Aided Design
  • CAGRA - Compound Annual Growth Rate
  • CAN - Campus Area Network
  • CAP - Competitive Access Provider
  • CAPTCHA - Completely Automatic Public Turing Test to Tell Computers and Humans Apart
  • CAR - Committed Access Rate
  • CAS - Channel-Associated Signaling
  • CAS - Content-Addressable Storage
  • CAT - Conditional Access Table (television)
  • CATV - Community Antenna Television
  • CBK - Common Body of Knowledge
  • CBR - Constant Bit Rate
  • CBS - Columbia Broadcasting System
  • CBS - Committed Burst Size
  • CC - Country Code
  • CCITT - International Telegraph and Telephone Consultative Committee (from the French)
  • CCK - Complementary Code Keying
  • CCO - Chief Compliance Officer
  • CCS - Centum Call Seconds (telephony)
  • CCS - Common Channel Signaling
  • ccTLD - Country Code Top-Level Domain
  • CCTV - Closed Circuit Television
  • CD - Collision Detection
  • CD - Compact Disc
  • CDL - Complex Directory Listing
  • CDM - Code Division Multiplexing
  • CDMA - Code Division Multiple Access
  • CE - Customer Edge
  • CEN - Carrier Ethernet Network
  • CES - Circuit Emulation Service
  • CERN - European Center for Nuclear Research
  • CF - Charging Function
  • CGI - Common Gateway Interface
  • CHAP - Challenge Handshake Authentication Protocol
  • CIA - Confidentiality, Integrity, and Availability
  • CICS - Customer Information Control System
  • CIDR - Classless Interdomain Routing
  • CIN - Composite Intermodulation Noise
  • CINR - Carrier to Interference-plus-Noise Ratio
  • CIO - Chief Information Officer
  • CIR - Committed Information Rate
  • CISO - Chief Information Security Officer
  • CISSP - Certified Information Systems Security Professional
  • CLASS - Custom Local Area Signaling Services
  • CLEC - Competitive Local Exchange Carrier
  • CLID - Calling Line Identification
  • CLLI - Common Language Location Identifier
  • CLLM - Consolidated Link Layer Management
  • CLNS - Connectionless Network Service (ISO)
  • CLO - Control Link Oscillator
  • CLP - Cell Loss Priority
  • CMS - Call Management Server
  • CMTS - Cable Modem Termination System
  • CNAME - Calling Name
  • CNAME - Canonical Name (DNS)
  • CNR - Carrier-to-Noise Ratio
  • CO - Central Office
  • CONS - Connection-Oriented Network Service (ISO)
  • COPS - Common Open Policy Service
  • COPS-PR - COPS Policy Provisioning
  • CoS - Class of Service
  • COT - Central Office Terminal
  • CPCP - Conference Policy Control Protocol
  • CPE - Customer Premises Equipment
  • CPM - Cost per thousand
  • CPU - Central Processing Unit
  • CRC - Cyclic Redundancy Check
  • CRM - Customer Relationship Management
  • CRS - Cell Relay Service
  • CRT - Cathode Ray Tube
  • CS - Circuit Switched
  • CS-ACELP - Conjugate-Structure Algebraic Code Excited Linear Prediction
  • CSA - Carrier Serving Area
  • CSC - Customer Service Center
  • CSCF - Call Session Control Function
  • CSMA - Carrier Sense Multiple Access
  • CSMA/CA - Carrier Sense Multiple Access with Collision Avoidance
  • CSMA/CD - Carrier Sense Multiple Access with Collision Detection
  • CSO - Chief Security Officer
  • CSO - Composite Second Order
  • CSU - Channel Service Unit
  • CSU/DSU - Channel Service Unit/Data Service Unit
  • CSV - Comma Separated Values
  • CTB - Composite Triple Beat
  • CTI - Computer Telephony Integration
  • CTV - Conventional Television
  • CWDM - Coarse Wavelength Division Multiplexing

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D

  • dB - Decibel
  • dBd - Decibel (Dysole antenna)
  • dBi - Decibel (Isotropic antenna)
  • dBmV - Decibel (milli volt source)
  • DA - Destination Address
  • DA - Distribution Area
  • DACS - Digital Access and Cross-connect System
  • DARPA - Defense Advanced Research Projects Agency
  • DC - Direct Current
  • DCE - Data circuit-terminating equipment
  • DCS - Digital Cross-Connect System
  • DCT - Discrete Cosine Transform
  • DDD - Direct Distance Dialing
  • DDNS - Dynamic Domain Name System
  • DDoS - Distributed Denial of Service
  • DDP - Datagram Delivery Protocol (Apple)
  • DDS - Digital Data Services
  • DE - Discard Eligible
  • DEC - Digital Equipment Company
  • DES - Data Encryption Standard
  • DFB - Distributed Feedback
  • DFT - Discrete Fourier Transform
  • DH - Diffie-Hellman
  • DHCP - Dynamic Host Configuration Protocol
  • DIA - Dedicated Internet Access
  • DID - Direct Inward Dialing
  • Diffserv - Differentiated Services
  • DL - Data Link
  • DLC - Digital Loop Carrier
  • DLCI - Data Link Connection Identifier
  • DLL - Data Link Layer
  • DLSw - Data Link Switching
  • DMT - Discrete Multitone Technology
  • DMZ - Demilitarized Zone
  • DNIS - Dialed Number Identification Service
  • DNS - Domain Name System
  • DOCSIS - Data Over Cable Service Interface Specification
  • DoD - Department of Defense
  • DOD - Direct Outward Dialing
  • DoS - Denial of service
  • DPI - Digital Program Insertion
  • DPI - Dots Per Inch
  • DPS - Department of Public Safety
  • DPSK - Differential Phase Shift Keying
  • DQDB - Distributed Queue Dual Bus
  • DRM - Digital Rights Management
  • DRP - Disaster Recovery Plan(ning),(ner)
  • DS - Digital Signal
  • DSB-SC-AM - Double Sideband Suppressed Carrier Amplitude Modulated
  • DSCP - Differentiated Services Code Points
  • DSL - Digital Subscriber Line
  • DSLAM - DSL access multiplexer
  • DSR - Digital Satellite Receiver
  • DSS - Digital Signature Standard
  • DSSS - Direct Sequence Spread Spectrum
  • DSU - Data service unit
  • DTCP - Digital Text Copy Protection
  • DTE - Data Terminal Equipment
  • DTI - DOCSIS Timing Interface
  • DTMF - Dual Tone Multifrequency
  • DTMF - Dual Tone Multiplexer
  • DV - Digital Video
  • DVD - Digital Versatile Disk (formerly Digital Video Disk)
  • DVI - Digital Visual Interface (connector)
  • DVP - Digital Video Processor
  • DVR - Digital Video Recorder
  • DVS - Digital Video Standard
  • DWRR - Deficit Weighted Round Robin
  • DWDM - Dense wavelength division multiplexing
  • DXI - Data Exchange Interface

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E

  • E-LAN - Ethernet LAN
  • E-Line - Ethernet Line
  • e-NodeB - Evolved NodeB
  • E-MBMS - Enhanced Multimedia Broadcast Multicast Service
  • E-Tree - Ethernet Tree
  • E-UNI - Ethernet User-to-Network Interface
  • E-UTRAN - Evolved UTRAN
  • EAP - Extensible Authentication Protocol
  • EAPOL - Extensible Authentication Protocol over LAN
  • EAS - Emergency Alert System (television)
  • EB - Exabyte
  • EBS - Excess Burst Size
  • ECN - Explicit Congestion Notification
  • ECSA - Exchange Carriers Standards Association
  • EDGE - Enhanced Data Rates for GSM Evolution
  • EDI - Electronic Data Interchange
  • EDTV - Extended Definition Television
  • EF - Expedited Forwarding
  • EGP - Exterior Gateway Protocol
  • EHF - Extremely High Frequency
  • EIA - Electronic Industries Alliance
  • EIGRP - Enhanced Interior Gateway Routing Protocol
  • EIR - Excess Information System
  • EIS - Executive Information System
  • EKTS - Electronic Key Telephone System
  • ELAN - Ethernet LAN
  • ELF - Extremely Low Frequency
  • EMI - Electromagnetic Interference
  • EMM - Entitlement Management (television)
  • EMTA - Embedded Multimedia Terminal Adapter
  • ENUM - Electronic Numbering
  • EOC - Embedded Operations Channel
  • EOD - Entertainment on Demand
  • EOF - End of Frame
  • EON - Expanded Optical Network
  • EoS - Ethernet over SONET
  • EoSONET - Ethernet over SONET
  • EPC - Evolved Packet Core
  • EPG - Electronic Program Guide
  • EPL - Ethernet Private Line
  • EPLAN - Ethernet Private LAN
  • EPON - Ethernet Passive Optical Network
  • EPS - Evolved Packet System
  • ERM - Edge Resource Manager
  • ERP - Enterprise Resource Planning
  • ES - Elementary Stream (television)
  • ESCON - Enterprise Systems Connection
  • ESD - Electrostatic Discharge
  • ESF - Extended Superframe
  • ESP - Encapsulation Security Payload
  • ESPN - Entertainment and Sports Programing Network
  • ESS - Electronic Switching System
  • ETR - External Timing Reference
  • ETSI - European Telecommunications Standards Institute
  • EV-DO - Evolution Data Optimized (or Data Only)
  • EVC - Ethernet Virtual Connection
  • EVM - Error Vector Magnitude
  • EVPL - Ethernet Virtual Private Line
  • EVPLAN - Ethernet Virtual Private LAN

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F

  • F-P - Fabry-Perot
  • FAT - Forward Application Transport (television)
  • FB - Framing Bit
  • FC - Fibre Channel
  • FC/IP - Fibre Channel over IP
  • FCAPS - Fault, Configuration, Accounting, Performance, and Security (management)
  • FCC - Federal Communications Commission
  • FCoE - Fibre Channel over Ethernet
  • FCS - Frame Check Sequence
  • FDD - frequency Division Duplex
  • FDDI - Fiber Distributed Data Interface
  • FDI - Feeder Distribution Interface (or Fiber Distribution Interface)
  • FDL - Facilities Data Link
  • FDM - Frequency Division Multiplexing
  • FDMA - Frequency Division Multiple Access
  • FDX - Full Duplex
  • FEC - Forward Equivalence Class
  • FEC - Forward Error Correction
  • FECN - Forward Explicit Congestion Notification
  • FHSS - Frequency Hopping Spread Spectrum
  • FICON - Fiber Connection
  • FIFO - First In, First Out
  • FM - Frequency Modulation
  • FOT - Fiber Optic Terminal
  • FPS - Frames per second
  • FRAD - Frame Relay Access Device
  • FRASI - Frame relay-to-ATM service interworking
  • FRBS - Frame Relay Bearer Services
  • FRC - Federal Radio Commission
  • FSK - Frequency Shift Keying
  • FSPF - Fabric Shortest Path First
  • FTG - Free to Guest
  • FTP - File Transfer Protocol
  • FTTC - Fiber-to-the-Curb
  • FTTH - Fiber-to-the-Home
  • FTTN - Fiber-to-the-Neighborhood
  • FTTN - Fiber-to-the-Node
  • FTTP - Fiber-to-the-Premises
  • FTTX - Fiber-to-the-X
  • FUNI - Frame User-to-Network Interface
  • FXO - Foreign eXchange Office
  • FXS - Foreign eXchange Station

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G

  • G.SHDSL - Single-Pair High-Speed Digital Subscriber Line
  • GB - Gigabyte
  • Gbps - Gigabits per second
  • GBIC - Gigabit Interface Converter (or Gigabit Interface Connector)
  • GDP - Gross Domestic Product
  • GED - Generic Embedded Device
  • GEPON - Gigabit Ethernet Passive Optical Network
  • GFC - Generic Flow Control
  • GFP - Generic Framing Procedure
  • GFP-F - Generic Framing Procedure-Frame
  • GFP-T - Generic Framing Procedure-Transparent
  • GFR - Guaranteed Frame Rate
  • GGSN - Gateway GPRS Support/Serving Node
  • GHz - Gigahertz
  • GIF - Graphical Interchange Format
  • GigE - Gigabit Ethernet
  • GIPS - Global IP Sound
  • GLB - Gramm-Leach-Bliley Act
  • GMPLS - Generalized Multiprotocol Label Switching
  • GMPλS - Generalized Multiprotocol Lambda Switching
  • GMSC - Gateway Mobile Switching Center
  • GMSK - Gaussian Minimum Shift Keying
  • GoP - Group of Pictures (video)
  • GoS - Grade of Service (telephony)
  • GPON - Gigabit Passive Optical Network
  • GPRS - General Packet Radio Service
  • GPS - Global Positioning System
  • GRE - Generic Routing Encapsulation
  • GRIN - Graded-index (optical fiber)
  • GSM - Global System for Mobile Communications
  • gTLD - Generic Top-Level Domain
  • GTS - Generic Traffic Shaping
  • GUI - Graphical user interface

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H

  • HBA - Host Bus Adapter (Fibre Channel)
  • HBI - Horizontal Blanking Interval (Video)
  • HBO - Home Box Office
  • HBS - Home Business Services
  • HBS - Home Business Solutions
  • HD - Hard Disk
  • HD - High Day (telephony)
  • HD - High Definition (television)
  • HDCP - High-bandwidth Digital Content Protection
  • HDLC - High-level Data Link Control
  • HDMI - High-Definition Multimedia Interface
  • HDS - High-Speed Data
  • HDSL - High-bit-rate Digital Subscriber Line
  • HDT - Host Digital Terminal
  • HDTV - High Definition Television
  • HDX - Half duplex
  • HE - Headend
  • HEC - Header Error Control
  • HF - High Frequency
  • HFC - Hybrid Fiber/Coax
  • HIPAA - Health Insurance Portability and Accountability Act
  • HIPPI - High Performance Parallel Interface
  • HITS - Headend in the Sky
  • HLR - Home Location Register
  • HM - Hum Modulation
  • HomeRF - Home Radio Frequency
  • HOSTID - Host Identifier
  • HOV - High Occupany Vehicle
  • HSD - High Speed Data
  • HSDPA - High-Speed Downlink Packet Access
  • HSPA - High Speed Packet Access
  • HSRP - Hot Standby Router Protocol
  • HSS - Home Subscriber Server
  • HSSI - High-Speed Serial Interface
  • HSUPA - High-Speed Uplink Packet Access
  • HTML - HyperText Markup Language
  • HTTP - HyperText Transport Protocol
  • HTTPS - HyperText Transport Protocol over SSL
  • HTU-C - HDSL Termination Unit-Central Office
  • HTU-R - HDSL Termination Unit-Remote
  • HVAC - Heating, Ventilating, and Air Conditioning
  • Hz - Hertz

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I

  • I - In phase (television)
  • I-CSCF - Interrogating-Call Session Control Function
  • I/O - Input/Output
  • IaaS - Infrastructure as a Service
  • IAB - Internet Architecture Board (Internet)
  • IAD - Integrated Access Device
  • IAHC - International Ad Hoc Committee (Internet)
  • IANA - Internet Assigned Numbers Authority (Internet)
  • IAP - Internet Access Provider
  • IAPP - Inter-Access Point Protocol
  • IBGP - Internal Border Gateway Protocol
  • IBM - International Business Machines
  • IC - Integrated Circuit
  • ICANN - Internet Corporation for Assigned Names and Numbers
  • ICB - Individual Case Basis
  • ICC - Interstate Commerce Commission
  • ICMP - Internet Control Message Protocol
  • iCPE - Intelligent Customer Premises Equipment
  • IDC - Internet data center
  • IDS - Intrusion Detection System
  • IDP - Internet Datagram Protocol (Xerox)
  • IE - Internet Explorer
  • IEC - Interexchange Carrier
  • IEEE - Institute of Electrical and Electronics Engineers
  • IETF - Internet Engineering Task Force
  • IF - Intermediate Frequency
  • IGP - Interior Gateway Protocol
  • IGRP - Interior Gateway Routing Protocol
  • IHL – IP Header Length
  • IKE - Internet Key Exchange
  • iLBC - Internet Low Bit Rate Codec
  • ILEC - Incumbent Local Exchange Carrier
  • IM - Instant Messaging
  • IMA - Inverse Multiplexing for ATM
  • IMAP - Internet Message Access Protocol
  • IMP - Interface Message Processor
  • IMS - Information Management System
  • IMS - IP Multimedia Subsystem
  • IMS-MGW - IMS Media Gateway Function
  • IN - Intelligent Network
  • InARP - Inverse Address Resolution Protocol
  • INCITS - International Committee for Information Technology Standards
  • IOF - Interoffice Facilities
  • IP - Internet Protocol
  • IPCP - IP Control Protocol
  • IPG - Interactive Program Guide
  • iPIC - International Primary (or Preferred or Presubscribed) Interexchange Carrier
  • IPS - Intrusion Prevention System
  • IPsec - Internet Protocol Security
  • IPT - IP Telephony
  • IPTV - IP Television
  • IPv4 - Internet Protocol Version 4
  • IPv5 - Internet Protocol Version 5
  • IPv6 - Internet Protocol Version 6
  • IPX - Internetwork Packet Exchange (Novell)
  • IR - Infrared
  • IRD - Integrated Receiver Decoder (satellite)
  • IRE - Institute of Radio Engineers
  • IRT - Integrated Receiver Transcoder (satellite)
  • IS-IS - Intermediate System-Intermediate System
  • ISAKMP - Internet Security Association and Key Management Protocol
  • iSCSI - Internet Small Computer System Interface
  • ISC - Intersystem Channel
  • ISC - Intersystem Coupling
  • ISDN - Integrated Services Digital Network
  • ISL - Inter-Switch Link (Fibre Channel)
  • ISO - International Organization for Standardization
  • ISOC - Internet Society
  • ISP - Internet Service Provider
  • ISR - Integrated Services Router
  • ISUP - ISDN User Part
  • IT - Information Technology
  • ITFS - Interactive Television Fixed Services
  • ITSP - Internet Telephony Service Provider
  • ITU - International Telecommunication Union
  • ITU-T - International Telecommunication Union Telecommunication Standardization Sector
  • IUA - ISDN User Adaptation
  • IV - Initialization Vector
  • IVR - Interactive Voice Response
  • IVS - Interactive Video Service
  • IXC - Interexchange Carrier

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J

  • JBOD - Just a bunch of disks
  • JPEG - Joint Photographic Experts Group

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K

  • KB - Kilobyte
  • kbps - Kilobits per second
  • KDC - Key Distribution Center
  • KM - Knowledge Management
  • KSU - Key Service Unit
  • KTS - Key Telephone System

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L

  • L2F - Layer 2 Forwarding
  • L2TP - Layer 2 Tunneling Protocol
  • LAC - L2TP Access Controller
  • LACNIC - Latin America Carribean Network Information Centre
  • LACP - Link Aggregation Control Protocol
  • LAG - Link Access Group
  • LAN - Local Area Network
  • LAP - Link Access Procedure
  • LAPB - Link Access Procedure Balanced (X.25)
  • LAPD - Link Access Procedure for the D-Channel (ISDN)
  • LAPF - Link Access Procedure for Frame-Mode Bearer Services
  • LAPM - Link Access Procedure for Modems
  • LASER - Light Amplification Stimulated Emission from Radiation
  • LATA - Local Access and Transport Area
  • LC - Logical Channel
  • LCAS - Link Capacity Adjustment Scheme
  • LCD - Liquid Crystal Display
  • LCP - Link Control Protocol
  • LD - Long Distance
  • LDP - Label Distribution Protocol
  • LEC - Local Exchange Carrier
  • LED - Light Emitting Diode
  • LEN - Length
  • LER - Label Edge Router
  • LF - Low Frequency
  • LIDB - Line Information Database
  • LLC - Logical Link Control
  • LLQ - Low Latency Queuing
  • LMDS - Local Multipoint Distribution Service
  • LNB - Low Noise Block (satellite)
  • LNP - Local Number Portability
  • LNS - L2TP Network Server
  • LOS - Line of Sight
  • LPC - Linear Predictive Coding
  • LPIC - Local Primary (or Preferred or Presubscribed) Interexchange Carrier
  • LSDB - Link State Database
  • LSP - Link State Packet
  • LSP - Label Switched Path
  • LSR - Label Switch(ing) Router
  • LSSU - Link Status Signal Unit
  • LTE - Long Term Evolution
  • LUN - Logical Unit Number (SCSI)
  • LVD - Low Voltage Disconnect

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M

  • M-CMTS - Modular CMTS
  • M2PA - MTP2 User Peer-to-Peer Adaptation
  • M2UA - MTP2 User Adaptation
  • M3UA - MTP3 User Adaptation
  • mA - Milliamp (measurement of electrical current)
  • MAC - Media Access Control
  • MAN - Metropolitan Area Network
  • MATV - Master Antenna Television
  • MB - Megabyte
  • Mbps - Megabits per second
  • MC - Message Center
  • MD - Message Digest
  • MD5 - Message Digest 5
  • MDF - Main Distribution Frame
  • MDS - Multipoint Distribution Service
  • MDU - Multiple Dwelling Unit
  • MEF - Metro Ethernet Forum
  • MEN - Metropolitan Ethernet Network
  • MER - Modulation Error Rate
  • MES - Metro Ethernet Service
  • MES - Metro Ethernet Solutions
  • MF - Medium Frequency
  • MF - Multifrequency
  • MFJ - Modified Final Judgment
  • MFSK - Minimum Frequency Shift Keying
  • MGCF - Media Gateway Control Function
  • MgS - Managed Security
  • MGW - Media Gateway
  • MHz - Megahertz
  • MIB - Management Information Base
  • MIC - Message Integrity Code
  • MIME - Multipurpose Internet Mail Extensions
  • MIMO - Multiple Input-Multiple Output
  • MIPS - Millions of Instructions per Second
  • MIT - Management Information Tree (Network Management)
  • MIT - Massachusetts Institute of Technology
  • MLFR - Multilink Frame Relay
  • MLP - Multi-Link PPP
  • MLPPP - Multi-Link Point-to-Point Protocol
  • MLT - Mechanized Line Testing
  • MLT - Multi-Link Trunking (Nortel)
  • MLT-3 - Multilevel Threshold 3
  • MM - Mobility Management Message
  • MMDS - Multichannel Multipoint Distribution Service
  • MME - Mobility Management Entity
  • MMF - Multimode Fiber
  • MN - Matched Node
  • MoCA - Multimedia over Cable Alliance
  • MOS - Mean Opinion Score
  • MOU - Memorandum of Understanding
  • MOU - Minutes of Usage (telephony)
  • MOV - Metal Oxide Varistor
  • MP - Multilink PPP
  • MP2MP - Multipoint-to-Multipoint
  • MP3 - Moving Picture Experts Group Layer-3 Audio
  • MPEG - Moving Picture Experts Group
  • MPLS - Multiprotocol Label Switching
  • MPTS - Multiple Program Transport Stream (television)
  • MRC - Monthly Recurring Charge
  • MRFC - Multimedia Resource Function Controller
  • MRFP - Multimedia Resource Function Processor
  • ms - Millisecond
  • MS - Mobile Station
  • MS-CHAP - Microsoft Challenge Handshake Authentication Protocol
  • MSAN - Multi-Service Access Network
  • MSC - Mobile Switching Center
  • MSK - Minimum Shift Keying
  • MSO - Multiple Service Operator
  • MSO - Multiple System Operator
  • MT-RJ - Mechanical Transfer Registered Jack (optical connector)
  • MTA - Multimedia Terminal Adapter
  • MTBF - Mean Time Between Failure
  • MTC - Main Telecommunications Center
  • MTC - Master Telecommunications Center
  • MTP - Message Transfer Part
  • MTSO - Mobile Telephone Switching Office
  • MTTR - Mean Time To Repair
  • MTU - Multi-tenant building
  • MUSICAM - Masking-pattern Adapted Universal Subband Integrated Coding and Multiplexing
  • MX - Message Exchange

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N

  • NAC - Network Access Control
  • NAC - Network Admission Control
  • NADC - North American Digital Cellular
  • NANP - North American Numbering Plan
  • NAP - Network Access Point
  • NAPT - Network Address Port Translation
  • NASA - National Aeronautics and Space Administration
  • NAT - Network Address Translation
  • NBC - National Broadcasting Company
  • NBS - National Bureau of Standards (now NIST)
  • NCS - Network Computing System
  • NCTA - National Cable and Telecommunications Association
  • NEC - National Electric Code
  • NETID - Network Identifier
  • NFAS - Non-Facility Associated Signaling
  • NFS - Network File System
  • NG-ADM - Next Generation Add/Drop Multiplexer
  • NG-DWDM - Next Generation Dense Wavelength Division Multiplexing
  • NG-SONET - Next Generation Synchronous Optical Network
  • NIC - Network Interface Card
  • NID - Network Interface Device
  • NIST - National Institute of Standards and Technology (formerly NBS)
  • NIU - Network Interface Unit
  • NL - Network Layer
  • NLOS - Near Line of Sight
  • nm - Nanometer
  • NMS - Network Management Station
  • NMS - Network Management System
  • NNI - Network Node Interface
  • NNI - Network-to-Network Interface
  • NNTP - Network News Transfer Protocol
  • NOC - Network Operations Center
  • NPA - Numbering Plan Area
  • NRC - Non-Recurring Charge
  • NSF - National Science Foundation
  • NSFnet - National Science Foundation Network
  • NSN - National Significant Number
  • NSS - Network Subsystem
  • NTP - Network Time Protocol
  • NTSC - National Television System Committee

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O

  • OAM&P - Operations, Administration, Maintenance, and Provisioning
  • OC - Optical Carrier
  • OCAP - Open Cable Application Platform
  • OFDM - Orthogonal Frequency Division Multiplexing
  • OFDMA - Orthogonal Frequency Division Multiplexed Access
  • OLAP - Online Analytical Processing
  • OLCP - Online Complex Processing
  • OLT - Optical Line Terminal
  • OLTP - Online Transaction Processing
  • ONT - Optical Network Terminal
  • OOB - Out of Band
  • OS - Operating System
  • OSI - Open Systems Interconnection
  • OSI-RM - Open Systems Interconnection Reference Model
  • OSPF - Open Shortest Path First
  • OSS - Operation Support System
  • OTDR - Optical Time-Domain Reflectometer: SONET, AT&T
  • OUI - Organizational Unique Identifier

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P

  • P - Provider (Used in MPLS to describe the provider core router)
  • P2MP - Point-to-Multipoint
  • P2P - Peer-to-peer
  • P2P - Point-to-point
  • P-CSCF - Proxy-Call Session Control Function
  • PaaS - Platform as a Service
  • PAL - Phase Alternating Line
  • PAM - Pulse Amplitude Modulation
  • PAN - Personal Area Network
  • PAP - Password Authentication Protocol
  • PARC - Palo Alto Research Center (Xerox)
  • PAT - Port Address Translation
  • PAT - Program Association Table (television)
  • PB - Petabyte
  • PBS - Public Broadcasting Service
  • PBX - Private Branch Exchange
  • PC - Personal Computer
  • PC - Professional Channel (television)
  • PCI - Payment Card Industry
  • PCI DSS - Payment Card Industry Data Security Standard
  • PCL - Path Control Layer (IBM)
  • PCM - Pulse Code Modulation
  • PCMM - Packet Cable Multimedia
  • PCMCIA - Personal Computer Memory Card International Association
  • PCR - Peak Cell Rate
  • PCR - Program Clock Reference (television)
  • PCRF - Policy and Charging Rules Function
  • PCS - Personal Communication Services
  • PDA - Personal Digital Assistant
  • PDF - Policy Decision Function
  • PDN - Packet Data Network
  • PDSN - Packet Data Support/Serving Node
  • PE - Provider Edge
  • PEG - Public, Education, Government (TV Channels)
  • PES - Packetized Elementary Stream
  • PESQ - Perceptual Evaluation of Speech Quality
  • PGP - Pretty Good Privacy
  • PGW - PDN Gateway
  • PH - Packet Handler
  • PHY - ATM Physical Layer
  • PIC - Preferred (or Primary or Presubscribed) Interexchange Carrier
  • PID - Packet Identification
  • PIN - Personal Identification Number
  • PING - Packet Internet Groper
  • Pixel - Picture Element
  • PKC - Public Key Cryptography
  • PLP - Packet Layer Protocol (X.25)
  • PMP - Point-to-Multipoint
  • PMT - Program Map Table
  • PoC - Push-to-Talk over Cellular
  • POD - Point of Deployment
  • PON - Passive Optical Network
  • POP - Point of Presence
  • POP - Post Office Protocol
  • POP3 - Post Office Protocol version 3
  • POS - Packet Over SONET
  • POS - Point of Sale
  • POTS - Plain Old Telephone Service
  • PPE - Personal Protective Equipment
  • PPP - Point-to-Point Protocol
  • PPPoA - Point-to-Point Protocol over ATM
  • PPPoE - Point-to-Point Protocol over Ethernet
  • PPTP - Point-to-Point Tunneling Protocol
  • PPV - Pay Per View
  • PQ - Priority Queuing
  • PRI - Primary Rate Interface
  • PS - Packet Switched
  • PSAP - Public Safety Answering Point
  • PSIP - Program and System Information Protocol
  • PSK - Phase Shift Keying
  • PSS - Personal Security Suite
  • PSTN - Public Switched Telephone Network
  • PTR - Pointer
  • PUC - Public Utilities Commission
  • PVC - Permanent Virtual Circuit
  • PVR - Personal Video Recorder

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Q

  • Q - Quadrature (television)
  • QAM - Quadrature Amplitude Modulation
  • QBLink - Quick Books Link
  • QPSK - Quadrature Phase Shift Keying
  • QoE - Quality of Experience
  • QoS - Quality of Service

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R

  • R-S - Reed-Solomon
  • RADIUS - Remote Authentication Dial-In User Service
  • RADSL - Rate Adaptive Digital Subscriber Line
  • RAID - Redundant Array of Independent Disks
  • RAN - Radio Access Network
  • RARP - Reverse Address Resolution Protocol
  • RAS - Remote Access Server
  • RBOC - Regional Bell Operating Company
  • RC4 - Rivest Code 4
  • RCA - Radio Corporation of America
  • RCF - Remote Call Forwarding
  • RD - Route Distinguisher
  • RDBMS - Relational Database Management System
  • RDC - Regional Data Center
  • RED - Random Early Detection
  • RF - Radio Frequency
  • RFC - Request For Comments
  • RFI - Radio Frequency Interference
  • RFID - Radio Frequency Identification
  • RFP - Request for Proposal
  • RGB - Red Green Blue
  • RIP - Routing Information Protocol
  • RIPE - Réseaux Internet Protocol Européens
  • RIPE NCC - Réseaux Internet Protocol Européens Network Coordination Center
  • RIR Regional Internet Registry
  • RJ - Recommended Jack
  • RMON - Remote Network Monitoring
  • RNC - Radio Network Control
  • RNR - Receiver Not Ready
  • ROI - Return On Investment
  • RPO - Recovery Point Objective
  • RPR - Resilient Packet Ring
  • RR - Receiver Ready
  • RSA - Rivest, Shamir, Adleman
  • RSM - Remote Switching Module
  • RSTP - Rapid Spanning Tree Protocol
  • RSVP - Resource Reservation Protocol
  • RSVP-TE - Resource Reservation Protocol with Traffic Engineering
  • RT - Remote Terminal
  • RTCP – Real-time Transport Control Protocol
  • RTO - Recovery Time Objective
  • RTP - Real-time Transport Protocol
  • rtPS - Real-time Polling Service (part of DOCSIS)
  • RU - Rack Unit

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S

  • S-CSCF - Serving-Call Session Control Function
  • S-HTTP - Secure Hypertext Transfer Protocol
  • S/MIME - Secure Multipurpose Internet Mail Extensions
  • S/N - Signal-to-Noise Ratio
  • S/PDIF - Sony/Philips Digital Interface Format
  • SA - Security Association
  • SA - Source Address
  • SAA - Service Assurance Agent
  • SaaS - Software as a Service
  • SAD - Silicon Avalanche Diode
  • SAE - System Architecture Evolution
  • SAN - Storage Area Network
  • SANS - System Administration, Networking and Security
  • SAP - Second Audio Program (television)
  • SAP - Service Access Point
  • SBB - Set-Back Box
  • SBC - Session Border Controller
  • SC - Subscription Channel (optical connector)
  • SCCP - Signaling Connection Control Part
  • SCCP - Skinny Client Control Protocol
  • SC-FDMA - Single Carrier FDMA
  • SCM - Supply Chain Management
  • SCP - Service Control Point
  • SCSI - Small Computer Systems Interface
  • SCTE - Society of Cable Telecommunications Engineers
  • SCTP - Stream Control Transmission Protocol
  • SD - Starting Delimiter
  • SDH - Synchronous Digital Hierarchy
  • SDI - Synchronous Digital Interface
  • SDLC - Synchronous Data Link Control
  • SDM - Space Division Multiplexing
  • SDP - Session Description Protocol
  • SDSL - Symmetric Digital Subscriber Line
  • SDTV - Standard Definition Television
  • SDV - Switched Digital Video
  • SDV-SM - SDV Session Manager
  • SECAM - Sequential Color with Memory
  • SEG - Security Gateway
  • SESAC - Society of European Songwriters, Artists, and Composers
  • SET - Secure Electronic Transactions
  • SF - Single Frequency
  • SF - Superframe
  • SFA - Sales Force Automation
  • SFTP - Secure File Transfer Protocol
  • SGSN - Serving GPRS Support/Serving Node
  • SGW - Signaling Gateway
  • SHA - Secure Hash Algorithm
  • SHA-1 - Secure Hash Algorithm 1
  • SHF - Super High Frequency
  • SIB - Service Independent Building Block
  • SIGTRAN - Signaling Transport
  • SIM - Subscriber Identity Module
  • SIMPLE - SIP for Instant Messaging and Presence Level Extensions
  • SIP - Session Initiation Protocol
  • SKC - Secret Key Cryptography
  • SL - Signaling Link
  • SLA - Service Level Agreement
  • SLF - Subscription Locator Function
  • SLIP - Serial Line Internet Protocol
  • SMB - Small/Medium/Business
  • SMDR - Station Message Detail Recording
  • SMDS - Switched Multimegabit Data Service
  • SMF - Single-Mode Fiber
  • SMPTE - Society of Motion Picture and Television Engineers
  • SMTP - Simple Mail Transfer Protocol
  • SNA - Systems Network Architecture
  • SNAP - Subnetwork Access Protocol
  • SNET - Southern New England Telephone
  • SNMP - Simple Network Management Protocol
  • SNR - Signal-to-Noise Ratio
  • SNS - Simple Name Server (Fibre Channel)
  • SOA - Service Oriented Architecture
  • SOC - System Operations Center
  • SOF - Start of Frame
  • SOHO - Small Office, Home Office
  • SoIP - Storage over IP
  • SONET - Synchronous Optical Network
  • SOX - Sarbanes-Oxley Act
  • SP - Signaling Point
  • SPAN - Services and Protocols for Advanced Networks
  • SPE - Synchronous Payload Envelope
  • SPQ - Strict Priority Queuing
  • SPTS - Single Program Transport Stream (television)
  • SPVC - Switched Permanent Virtual Circuit
  • SPX - Synchronous Packet Exchange
  • SQL - Stuctured Query Language
  • SRP - Spacial Reuse Protocol
  • SRTP - Secure Real-time Transport Protocol
  • SS7 - Signaling System 7
  • SSB - Single Sideband
  • SSH - Secure Shell
  • SSID - Service Set Identifier
  • SSL - Secure Sockets Layer
  • SSP - Service Switching Point
  • ST - Segment Type (DQDB, SMDS)
  • ST - Signaling Terminal
  • ST - Straight Tip (optical connector)
  • STB - Set-Top Box
  • STC - Satellite Telecommunications Center
  • STC - Secondary Telecommunications Center
  • STDM - Statistical Time Division Multiplexing
  • sTLD - Sponsored Top-Level Domain
  • STM - Synchronous Transfer Mode
  • STM - Synchronous Transport Module
  • STP - Shielded Twisted Pair
  • STP - Signaling Transfer Point
  • STP - Spanning Tree Protocol
  • STS - Synchronous Transport Signal
  • SVC - Switched Virtual Circuit
  • SUA - SCCP User Adaptation
  • SVC - Switched Virtual Circuit
  • SWC - Serving Wire Center
  • SYN - Synchronize bit (TCP)

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T

  • TA96 - 1996 Telecommunications Act
  • TACACS - Terminal Access Controller Access Control System
  • TB - Terabyte
  • TB - Transparent Bridging (or Transparent Bridge)
  • Tbps - Terabits per second
  • TCAP - Transaction Capabilities Application Part
  • TCBH - Time-Consistent Busy Hour
  • TCM - Trellis Coded Modulation
  • TCO - Total Cost of Ownership
  • TCP - Transmission Control Protocol
  • TCP/IP - Transmission Control Protocol/Internet Protocol
  • TDD - Time Division Duplex
  • TDM - Time Division Multiplexing
  • TDMA - Time Division Multiple Access
  • TDR - Time Domain Reflectometer
  • TE - Traffic Engineering
  • TEA - Tiny Encryption Algorithm
  • TFTP - Trivial File Transfer Protocol
  • TH - Transmission Header
  • TIA - Telecommunications Industry Association
  • TIPHON - Telecommunications and Internet Protocol Harmonization over Networks
  • TISPAN - Telecommunications and Internet Converged Services and Protocols for Advanced Networking
  • TKIP - Temporal Key Integrity Protocol
  • TLD - Top-Level Domain
  • TLS - Transport Layer Security
  • TM - Terminal Multiplexer
  • TMN - Telecommunications Management Network
  • ToS - Type of Service: IP
  • TP - Twisted Pair
  • TRS - Telephone Relay Service
  • TSNFC - Two-Stage Noise Feedback Coding
  • TTD - Time to Data
  • TTL – Time To Live (IP
  • TTY - Telephone Typewriter
  • TV – Television
  • TWA - Two Way Alternate
  • TWC - Time Warner Cable

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U

  • UADSL - Universal ADSL
  • UBE - Unsolicited Bulk Email
  • UBR - Unspecified Bit Rate
  • UCE - Unsolicited Commercial Email
  • UDP - User Datagram Protocol
  • UDRP - Uniform Domain-Name Dispute-Resolution Policy
  • UDWDM - Ultradense Wavelength Division Multiplexing
  • UHF - Ultra High Frequency
  • UM - Unified Messaging
  • UMTS - Universal Mobile Telecommunications System
  • UNI - User-to-Network Interface
  • UPC - Untra Physical Contact
  • UPnP - Universal Plug and Play
  • UPS - Uninterruptible Power Supply
  • UPSR - Unidirectional Path Switched Ring
  • URI - Uniform Resource Identifier
  • URL - Uniform Resource Locator
  • USB - Universal Serial Bus
  • UTP - Unshielded Twisted Pair
  • UTRAN - UMTS Terrestrial Radio Access Network
  • UV - Ultraviolet

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V

  • V2B - Video to Backbone (television)
  • VBI - Vertical Blanking Interval (Video)
  • VBR - Variable Bit Rate
  • VBR-NRT - Non-Real-Time: ATM
  • VBR-RT - Real-Time: ATM
  • VC - Video Codec
  • VC - Virtual Channel
  • VC - Virtual Circuit
  • VCAT - Virtual Concatenation
  • VCC - Virtual Channel Connection
  • VCI - Virtual Channel Identifier
  • VCR - Video Cassette Recorder
  • VCSEC - Virtual Cavity Surface Emitting Laser
  • VDSL - Very High-Speed Digital Subscriber Line
  • VF - Voice Frequency
  • VGA - Video Graphics Array
  • VHF - Very High Frequency
  • VINES - Virtual Networking System (Banyan)
  • VIP - VINES Internet Protocol (Banyan)
  • VLF - Very Low Frequency
  • VLAN - Virtual LAN
  • VLR - Visitor Location Register
  • VLSM - Variable Length Subnet Mask
  • VOD - Video On Demand
  • VoIP - Voice Over IP
  • VOM - Volt-Ohm Meter
  • VP - Virtual Path
  • VPC - Virtual Path Connection
  • VPI - Virtual Path Identifier
  • VPLS - Virtual Private LAN Service
  • VPN - Virtual Private Network
  • VRF - VPN Routing and Forwarding Table
  • VSB - Vestigial Side Band (modulation)
  • VT - Virtual Tributary
  • VTP- Virtual Terminal Protocol (ISO)
  • VTP - VLAN Trunk Protocol
  • VRLA - Valve Regulated Lead Acid (battery)

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W

  • WAN - Wide Area Network
  • WAP - Wireless Access Point
  • WAP - Wireless Application Protocol
  • WDM - Wavelength Division Multiplexing
  • WEP - Wired Equivalency Protocol
  • WFQ - Weighted Fair Queuing
  • WG - Working Group
  • Wi-Fi - Registered mark of the Wi-Fi Alliance
  • WiMAX - Worldwide Interoperability for Microwave Access (802.16)
  • WISP - Wireless Internet Service Provider
  • WLAN - Wireless Local Area Network
  • WPA - Wi-Fi Protected Access
  • WPAN - Wireless Personal Area Network
  • WRED - Weighted Random Early Detection
  • WRR - Weighted Round Robin
  • WWDM - Wide Wavelength Division Multiplexing
  • WWN - World Wide Name
  • WWW - World Wide Web

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X

  • XCAP - XML Configuration Access Protocol
  • xDSL - x-Type Digital Subscriber Line
  • XML - Extensible Markup Language
  • XMOD - Cross Modulation
  • XNS - Xerox Network System (Xerox)

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Y

  • YB - Yottabyte

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Z

  • ZB - Zettabyte
  • ZCS - Zero Code Suppression