From Hill2dot0
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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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- 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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- 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 - 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 - 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-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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- 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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- 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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- 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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- 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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- 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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- ZB - Zettabyte
- ZCS - Zero Code Suppression
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