Telecom Glossary
- 3G – Third Generation
- 3GPP, 3GPP2 – Third Generation Partnership Project, Project 2
- AAA – Authentication, Authorization and Accounting
- AAL – ATM Adaptation Layer
- ACD – Automatic Call Distribution
- ACTS – Automated Coin Toll Service
- ADPCM – Adaptive Differential Pulse Code Modulation
- AG – Access Gateway
- AH – Authentication Header
- AIN – Advanced Intelligent Network
- AIS – Alarm Indication Signaling
- AIX – Advanced Interactive Executive
- ALCAP – Access Link Control Application Protocol
- AMR – Adaptive Multi-Rate
- ANDSF – Access Network Discovery and Selection Function
- ANSI – American National Standards Institute
- AP – Application Part
- API – Application Programming Interface
- APP – Application Marker
- APS – Automatic Protection Switching
- ARP – Address Resolution Protocol
- AS – Application Server
- ASN-1 – Abstract Syntax Notation One Encoder / Decoder
- ASP – Application Service Provider
- ASR – Audio Response System
- ATCA – Advanced Telecommunications Computing Architecture
- ATM – Asynchronous Transfer Mode
- ATMARP – Asynchronous Transfer Mode Address Resolution Protocol
- AuC – Authentication Center
- B-ISUP – Broadband ISDN User Part
- B2BUA – Back-to-Back User Agent
- BDP – Business Decision Point
- BGCF – Breakout Gateway Control Function
- BICC – Bearer Independent Call Control
- BM-SC – Broadcast / Multicast Service Center
- BMC – Broadcast Multicast Control
- BOOTP – Bootstrap Protocol
- BRAS/MSS – Broadband Remote Access Switch / Multi Service Switch
- BS – Base Station
- BSC – Base Station Controller
- BSS – Base Station System
- BSSAP – Base Station System Application Part
- BSSGP – Base Station Subsystem GPRS Protocol
- BTS – Base Transceiver System
- BTSM – BTS Management
- CALA – Caribbean and Latin America
- CAMEL – Customized Applications for Mobile Networks Enhanced Logic
- CAN – Connectivity Access Network
- CAP – CAMEL Application Part
- CAPEX – Capital Expenditure
- CBC – Cell Broadcast Center
- CBN – Common Bonding Network
- CC – Call Control, Connection Confirm
- CCF – Charging Control Function
- CCPU – Continuous Computing
- CD-ROM – Compact Disc Read-Only Memory
- CDMA – Code Division Multiple Access
- CDVT – Cell Delay Variation Tolerance
- CFR – Code of Federal Regulations
- CGF – Charging Gateway Function
- CGW – Charging Gateway
- CID – Channel Identifier
- CISPR – Comite International Spécial des Peturbations Radioélectriques (or International Special Committee on Radio Interference)
- CLEI – Common Language Equipment Identifier
- CLI – Command Line Interface
- CLIP – Classical IP
- CM – Connection Manager
- CN – Core Network
- COPS – Common Open Policy Service
- COPS-PR – COPS Policy Provisioning
- CORBA – Common Object Request Broker Architecture
- COTS – Commercial Off-The-Shelf
- CP-TA – Communications Platforms Trade Association
- CPU – Central Processing Unit
- CRF – Charging Rules Function
- CS – Circuit Switched
- CS2K – Communication Server 2000
- CSA – Canadian Standards Association
- CSCF – Call Session Control Function
- CSE – CAMEL Service Environment
- CSU – Computer Switching Unit
- CSV – Comma Separated Values
- DAT – Digital Audio Tape
- DES – Diagnostic Error Signaling
- DFT/HA – Distributed Fault-Tolerant / High Availability
- DFT – Distributed Fault-Tolerant
- DHCP – Dynamic Host Configuration Protocol
- Diameter – Signaling protocol for AAA functions in IMS networks
- DiffServ – Differentiated Services
- DL – Data Link, Down Link
- DLT – Digital Linear Tape
- DNS – Domain Name System
- DPI – Deep Packet Inspection
- DPM – Downtime Performance Measurement
- DS-0 – Digital Signal Zero (64Kbps)
- DS-1 – Digital Signal One (1.544Mbps)
- DS-3 – Digital Signal Three (44.7Mbps)
- DS – Differentiated Services
- DSCP – Dynamic Subnet Configuration Protocol
- DSL – Digital Subscriber Line
- DSLAM – Digital Subscriber Line Access Multiplexer
- DSMIP – Dual Stack Mobile IP
- DSP – Digital Signal Processing
- DSU – Digital Switching Unit
- DTMF – Dual Tone Multi-Frequency
- DVD – Digital Video Disk
- DVMRP – Distance Vector Multicast Routing Protocol
- E1 – European Format Digital Signal Level 1
- EADPCM – Embedded Adaptive Differential Pulse Code Modulation
- EAP – Extensible Authentication Protocol
- eBM-SC – Enhanced Broadcast / Multicast Service Center
- eBS – Evolved Base Station
- ECF – Event Charging Function
- ECMP – Equal Cost Multi-Path
- EIA – Electronic Industries Association
- EIR – Equipment Identification Register
- EM – Element Manager
- EMC – Electromagnetic Compatibility
- EMS – Element Management System
- EN – European Norm
- eNb – E-UTRAN NodeB
- ENUM – Telephone Number Mapping
- EPC – Evolved Packet Core
- EPS – Evolved Packet System
- ePDG – Enhanced Packet Data Gateway
- ESI – End System Identifier
- ESP – Encapsulating Security Payload
- ETS – European Telecommunication Standard
- ETSI – European Telecommunications Standards Institute
- E-UTRAN – Evolved UTRAN
- F1 – F1 Class of OAM
- F3 – Virtual Path OAM
- F5 OAM – Virtual Circuit OAM
- FA – Foreign Agent
- FAP – Femto Access Point
- FCC – Federal Communications Commission
- FGW – Femto Gateway
- FITs – Failures per Billion Hours of Operation
- FMECA – Fault Modes, Effects and Criticality Analysis
- FP – Framing Protocol
- FR – Frame Relay
- FRU – Field Replaceable Unit
- FT/HA – Fault-Tolerant / High Availability
- FTP – File Transfer Protocol
- FTTx – Fiber to the curb / home / premises
- GAN – Generic Access Network
- GANC – Generic Access Network Controller
- GbE – Gigabit Ethernet
- GERAN – GSM Edge Radio Access Network
- GGSN – Gateway GPRS Support Node
- GK – Gatekeeper
- GMLC – Gateway Mobile Location Center
- GMM/SM – GPRS Mobility Management and Session Management
- GMSC – Gateway MSC
- GPRS – General Packet Radio System
- GPS – Global Positioning System
- GRE – Generic Routing Encapsulation
- GSM – Global System for Mobile Communications
- GSN – GPRS Support Node
- GSP – Global Service Provider
- GTP – GPRS Tunneling Protocol
- GTT – Global Title Translation
- GUI – Graphical User Interface
- GW – Gateway
- H.248 – MEGACO, Media Gateway Control Protocol
- H.323 – Umbrella protocol for H.255.0, H.245, H.450
- HA – High Availability
- H-AAA – Home AAA
- HDLC – High-level Data Link Control
- HDTV – High Definition Television
- HLR – Home Location Register
- HNB – Home NodeB
- HSS – Home Subscriber Server
- I-CSCF – Interrogating Call Session Control Function
- i-SCSI – Internet Small Computer Systems Interface
- I/F – Interface
- I/O – Input / Output
- IA – Intel Architecture
- IAD – Integrated Access Device
- IBN – Isolated Bonding Network
- ICMP – Internet Control Message Protocol
- IEC – Inter Exchange Carrier
- IEEE – Institute of Electrical and Electronics Engineers
- IETF – Internet Engineering Task Force
- IGMP – Internet Group Management Protocol
- IKE – Internet Key Exchange
- ILMI – Integrated Local Management Interface
- IM – Instant Messaging
- IM-SSF – IP Multimedia – Service Switching Function
- IME – Interface Management Entity
- IMS – IP Multimedia Subsystem
- IMS-MGW – IP Multimedia Subsystem Media Gateway Function
- IN – Intelligent Network
- INAP – Intelligent Network Application Protocol
- InATMARP – Inverse ATMARP
- IOS – Inter-Operability Specifications
- IP – Internet Protocol
- IP PBX – Internet Protocol Private Branch Exchange
- IP-SP – IP-Signaling Point
- IPBCP – IP Bearer Control Protocol
- IPoA – IP over ATM
- IPsec – IP Security
- IPT – Integrated Project Team
- IPTV – IP Television
- IRIG-B – Inter Range Instrumentation Group mod B
- ISC – IMS Service Control
- ISDN – Integrated Services Digital Network
- ISG – Intelligent Services Gateway
- ISO/IEC – International Organization of Standardization / International – Electrotechnical Commission
- ISUP – ISDN User Part
- ITU-T – International Telecommunications Union Telecom sector
- IUA – ISDN Q.921 User Adaptation Layer
- IVR – Interactive Voice Response
- IWGW – Interworking Gateway
- IWMSC – Interworking MSC
- JFS – Journaling File System
- JTAG – Joint Test Action Group
- KVM – Keyboard Video Mouse
- L1 – Layer 1 in OSI Model (Physical Layer)
- L2 – Layer 2 in OSI Model (Data Link layer)
- L2F – Layer 2 Forwarding
- L2TP – Layer 2 Tunneling Protocol
- LAN – Local Area Network
- LAPB – Link Access Procedure Balanced
- LAPC – Link Access Procedure for Control Plane
- LAPD – Link Access Protocol on D channel
- LAPDm – LAPD Mobility
- LAPV5 DL – Link Access Protocol V5 Data Link
- LAPV5 EF – Link Access Protocol V5 Envelope Function
- LB – Load Balancing
- LBS – Location-Based Services
- LCS – Location Services
- LDAP – Lightweight Directory Access Protocol
- LDF – Load Distribution Function
- LE – Local Exchange
- LL – Local Loop
- LLC – Logical Link Control
- LMA – Local Mobility Anchor
- LMI – Local Management Interface
- LMU – Location Management Unit
- LNP – Local Number Portability
- LOC – Location Center
- LSR – Label Switch Router
- LTE – Long-Term Evolution
- M2PA – MTP2 Peer-to-Peer Adaptation Layer
- M2UA – MTP2 User Adaptation Layer
- M3UA – MTP3 User Adaptation Layer
- MAC – Media Access Control
- MAG – Mobile Access Gateway
- MAP – Mobile Application Part
- MBMS – Multimedia Broadcast Multicast Service
- MBS – Maximum Burst Size
- MCE – Multi-cell / multicast Coordination Entity
- MCU – Multipoint Conference Unit
- MD 5 – Message-Digest Algorithm
- MD – Manufacture Discontinue
- MDM – Media Device Manager
- MEGACO – Media Gateway Control Protocol (H.248)
- Mesh-BN – Meshed Bonding Network
- MFC – Most Favored Customer
- MFRP – Multimedia Function Resource Processor
- MG – Media Gateway
- MGC – Media Gateway Controller
- MGCF – Media Gateway Control Function
- MGCP – Media Gateway Control Protocol
- MGW – Media Gateway
- MIB – Management Information Base
- MIMO – Multiple Input, Multiple Output
- MIP – Mobile IP
- MIPS – Million Instructions Per Second
- MM – Mobility Management
- MME – Mobile Management Entity
- MMS – Multimedia Messaging Service
- MNP/LNP – Mobile / Local Number Portability
- MPLS – Multi-Protocol Label Switching
- MPoA – Multi-Protocol over ATM
- MRFC – Multimedia Resource Function Controller
- MRFP – Multimedia Resource Function Processor
- MSC – Mobile Switching Center
- MSCF – Messaging Service Control Function
- MTP – Message Transfer Part
- NA – North American
- NAPT – Network Address Port Translation
- NAS – Network Attached Storage, Not Access Stratum
- NAT – Network Address Translation
- NBAP – Node B Application Part
- NEBS – Network Equipment Building System
- NEDS – Network Equipment Development Standard
- NFS – Network File System
- NGN – Next Generation Network
- NIC – Network Interface Card
- NNI – Network-Network Interface
- NRE – Non-recoverable Engineering
- NS – Network Services
- NSRP – Network Service-Ready Platform
- NTP – Network Time Protocol
- OAM – Operations, Administration & Maintenance
- OC-3 – Optical Carrier Level 3 (155.5Mbps)
- OC-12 – Optical Carrier Level 12 (622.1Mbps)
- OC-48 – Optical Carrier Level 48 (2.488Gbps)
- OC-192 – Optical Carrier Level 192 (9.953Gbps)
- OC-768 – Optical Carrier Level 768 (39.81Gbps)
- OEM – Original Equipment Manufacturer
- OFDM – Orthogonal Frequency Division Multiplexing
- OFDMA – Orthogonal Frequency Division Multiple Access
- OFM – Outage Frequency Measurement
- OM – Operational Measurement
- OPEX – Operating Expense
- OSA – Open Service Access
- OSA-GW – Open Service Access – Gateway
- OSA-SCS – Open Services Architecture Service Capability Server
- OSI – Open Systems Interconnection
- OSP – Open Settlement Protocol
- OSPF – Open Shortest Path First
- OSS – Operations Support System
- OXC – Optical Cross Connect
- P-CSCF – Proxy Call Session Control Function
- P-MSC – Packet Mobile Switching Center
- PBX – Private Branch Exchange
- PCAP – Positioning Calculation Application Part
- PCI – Peripheral Component Interconnect
- PCR – Peak Cell Rate
- PDCP – Packet Data Control Protocol
- PDF – Policy Decision Function
- PDG – Packet Data Gateway
- PDSN – Packet Data Support Node
- PEC – Product Engineering Code
- PG-MSC – Packet Gateway Mobile Switching Center
- PGW – Packet Gateway
- PHP – PHP Hypertext Preprocessor embedded scripting language
- PHY – Physical Layer
- PI – Product Integrity
- PICMG – PCI Industrial Computers Manufacturers Group
- PKM – Privacy Key Management
- PLOA – Protocol Layers Over ATM
- PMC – PCI Mezzanine Card
- PMIP – Proxy Mobile IP
- POTS – Plain Old Telephone Service
- PPC – PowerPC
- PPP – Point-to-Point Protocol
- PPTP – Point-to-Point Tunneling Protocol
- PRI – Primary Rate Interface
- PSF – Protocol-Specific Function
- PSTN – Public Switched Telephone Network
- PTM – Packet Telephony Manager
- PTT – Push-to-Talk
- PVC – Permanent Virtual Circuit
- PVG – Packet Voice Gateway
- QoE – Quality of Experience
- QoS – Quality of Service
- RFP – Request for Proposal
- RFQ – Request for Quote
- RIP – Routing Information Protocol
- RLC – Radio Link Control
- RLC/MAC – GPRS Radio Link Control / Medium Access Control
- RNC – Radio Network Controller
- RNSAP – Radio Network Subsystem Application Part
- ROI – Return on Investment
- RR – Radio Resource
- RRC – Radio Resource Control
- RTCP – Real-time Control Protocol
- RTP – Real-time Transport Protocol
- RTPC – Signaling Route Management Transfer Prohibited Control
- S-CSCF – Serving Call Session Control Function
- SABP – Service Area Broadcast Protocol
- SAE – System Architecture Evolution
- SAF – Service Availability Forum
- SAN – Storage Area Network
- SBC – Session Border Controller, Single Board Computer
- SCCP – Signaling Connection Control Part
- SCF – Switching Control Function
- SCIM – Service Capability Interaction Manager
- SCP – Service Control Point
- SCR – Sustained Cell Rate
- SCS – Service Capability Server
- SCSI – Small Computer System Interface
- SCTP – Stream Control Transmission Protocol
- SDH – Synchronous Digital Hierarchy
- SDHLR – Super Distributed Home Location Register
- SDK – Software Development Kit
- SDP – Session Description Protocol
- SEG – Security Gateway
- SFP – Small Form-factor Pluggable
- SG – Signaling Gateway
- SGF – Set Graphic Rendition
- SGSN – Serving GPRS Support Node
- SHA-1 – Secure Hash Algorithm-1
- SIGTRAN – Signaling Transport
- SIP – Session Initiation Protocol
- SLF – Subscription Locator Function
- SM – Session Management
- SMLC – Serving Mobile Location Center
- SMP – Symmetrical Multi-Processing
- SMS – Short Messaging Service
- SMSC – Short Message Service Center
- SNA – Storage Network Architecture
- SNC – Synchronous Network Clock
- SNDCP – SubNetwork-Dependent Convergence Protocol
- SNMP – Simple Network Management Protocol
- SNTP – Simple Network Time Protocol
- SONET – Synchronous Optical Network
- SPARC – Scalable Processor Architecture
- SPG – Signaling Processor Gateway
- SRF – Specialized Resource Function
- SRNC (UMB) – Session Reference Network Controller
- SRNC (WCDMA) – Serving RNC
- SRTP – Secure Real-Time Protocol
- SS – Supplementary Services
- SS7 – Signaling System 7
- SSC1 – Seismic Server Cabinet 1
- SSCF – Service Specific Coordination Function
- SSCOP – Service Specific Connection Oriented Protocol
- SSCS – Service Specific Convergence Sublayer
- SSF – Service Switching Function
- SSH – Secure Shell
- SSP – Signaling Service Point
- SSS – Signaling Software Subsystem
- STC – Signaling Transport Converter
- STM – Synchronous Transfer Mode
- STP – Signaling Transfer Point
- SUA – SCCP User Adaptation Layer
- SVC – Switched Virtual Circuit
- T1 – Digital Carrier Facility for Digital Signal Level 1
- TAPA – Trillium Advanced Portability Architecture
- TAS – Telephony Application Server
- TC – Transmission Convergence Sublayer
- TCAP – Transaction Capability Application Part
- TCP – Transmission Control Protocol
- TCP/IP – Transmission Control Protocol / Internet Protocol
- TCO – Total Cost of Ownership
- TDM – Time Division Multiplexing
- TEM – Telecom Equipment Manufacturer
- TFTP – Trivial File Transfer Protocol
- THIG – Topology Hiding Internetwork Gateway
- TNL – Transport Network Layer
- TLS – Transport Layer Security
- TRX – Transcoder
- TTS – Text-To-Speech
- TUCL – TCP / UDP Convergence Layer
- TUP – Telephony User Part
- UAS – Universal Audio Server
- UBR – Unspecified Bit Rate
- UDP – User Datagram Protocol
- UE – User Equipment
- UL – Underwriters Laboratory
- UMA – Unlicensed Mobile Access
- UMB – Ultra Mobile Broadband
- UMTS – Universal Mobile Telecommunications System
- UNC – Universal Naming Convention
- UNI – User-Network Interface
- UP – User Plane
- USP – Universal Signaling Point
- UTRAN – UMTS Terrestrial Radio Access Network
- UUI – User-to-User Indicator
- V5.2 – V5.2 Interface Signaling
- V5UA – V5.2-User Adaptation Layer
- V-AAA – Visitor AAA
- VBR – Variable Bit Rate
- VC – Virtual Connection
- VCC – Virtual Channel Connection
- VCCI – Voluntary Control Council for Interference
- VCI – Virtual Channel Identifier
- VCL – Virtual Channel Links
- VLAN – Virtual Local Area Network
- VLR – Visiting Location Register
- VNS – Voice Navigation System
- VO – Validation Office
- VoATM – Voice over ATM
- VoD – Video on Demand
- VoIP – Voice over Internet Protocol
- VP – Virtual Path
- VPI – Virtual Path Identifier
- VPL – Virtual Path Links
- VPN – Virtual Private Network
- VRRP – Virtual Router Redundancy Protocol
- VrTx – Virtual Real-Time Executive real-time operating system
- VXML – Voice Extensible Markup Language
- WAG – Wireless Access Gateway
- WCDMA – Wideband CDMA
- WLAN – Wireless Local Area Network
- WRR – Weighted Round Robin
- WSF – Wireless Service Framework
- X.25 – Packet switched data network protocol
- XFS – X Font Server
