Beware, this page is old, 1996.
Acronym Listing
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A | B |
C | D | E |
F | G | H |
I | J | K |
L | M | N |
O | P | Q |
R | S | T |
U | V | W |
X | Y | Z
-2-
2B1Q Two Binary One Quaternary
[Top]
-4-
4GL Fourth Generation Language
[Top]
-A-
A/D Analog-to-Digital
AAL ATM Adaptation Layer
AARP AppleTalk Address Resolution Protocol
AAV Alternate Access Vendors
ABM Asynchronous Balanced Mode (HDLC)
ABR Available Bit Rate (ATM)
ABS Alternate Billing Service
ABS Average Busy Stream
ABSBH Average Busy Season Busy Hour (telephony)
AC Access Control (Token Ring, FDDI)
AC Alternating Current
ACD Automatic Call Distribution
ACF Access Control Field (DQDB)
ACF Advanced Communication Function
ACK Acknowledgement (DDCMP, BISYNC)
ACM Address Complete Message (SS7)
ACSE Association Control Service Element (Application Layer)
ACTLU Activate Logical Unit (SNA)
ACTPU Activate Physical Unit (SNA)
ACTS Advanced Communications Technology Satellite
ADCCP Advanced Data Communications Control Procedures (ANSI)
ADM Add/Drop Multiplexer
ADPCM Adaptive Differential Pulse Code Modulation
ADSL Asymmetrical Digital Subscriber Line (Bellcore)
ADSP AppleTalk Data Stream Protocol
AEP AppleTalk Echo Protocol
AFI Authority and Format Identifier (ISO)
AIA Aerospace Industry Association
AIAG Automotive Industry Action Group
AIN Advanced Intelligent Network
AIP ATM Interface Processor
AIRS Alarm Identification Reporting System (Harris Corp.)
AIX Advanced Interactive Executive (IBM's Version of UNIX Operating
System)
ALU Arithmetic Logic Unit
AM Active Monitor
AM Administrative Module (AT&T 5ESS)
AM Amplitude Modulation
AMI Alternate Mark Inversion
AMP Active Monitor Present (Token Ring)
AMP Administrative Module Processor
AMPS Advanced Mobile Phone System
ANI Automatic Number Identification (ISDN)
ANM Ameritech Network Management
ANR Automatic Network Routing
ANS Advanced Network and Services, Inc.
ANS American National Standard
ANSI American National Standards Institute
AP Application Program
APD Avalanche Photodiode
APDU Application Protocol Data Unit
API Applications Programming Interface
APL Analog Private Line
APP Applications Portability Profile
APPC Advanced Program-to-Program Communication (IBM)
APPN Advanced Peer-to-Peer Networking (IBM)
APS Automatic Protection Switching
APT Telephony Applications System
APZ Telephony Control System
ARE All Routes Explorer (Source Routing)
ARM Asynchronous Response Mode (HDLC)
ARP Address Resolution Protocol (IETF)
ARPA Advanced Research Projects Agency
ARPANET Advanced Research Projects Agency Network
ARQ Automatic Repeat Request
AS Autonomous System
ASCII American Standard Code for Information Interchange (ANSI)
ASDS ACCUNET Spectrum of Digital Services (AT&T)
ASI Alternate Space Inversion
ASIC Application Specific Integrated Circuit
ASK Amplitude Shift Keying
ASN Abstract Syntax Notation (ITU-T)
ASN.1 Abstract Syntax Notation One (ITU-T)
ASP Advanced Speech Processor
ASP AppleTalk Session Protocol
AT Advanced Technology
AT&T American Telephone and Telegraph
ATDM Asynchronous Time-Division Multiplexing
ATM Asynchronous Transfer Mode
ATM Automatic Teller Machine
ATP AppleTalk Transaction Protocol
ATP Application Transaction Programs
ATSC American Television Systems Committee
ATSC Australian Telecommunication Standardization Committee
AUI Attachment Unit Interface
AURP AppleTalk Update-based Routing Protocol
AUX Apple UNIX
AWG American Wire Gauge
[Top]
-B-
B Bridge
B Interpolated Pictures (MPEG)
B-CDMA Broadband Code-Division Multiple Access
B-ICI Broadband Intercarrier Interface (ATM)
BISDN Broadband Integrated Services Digital Network (ISDN)
B-ISUP Broadband ISDN User Part (SS7)
B-LE Broadband Local Exchange (B-ISDN)
B-TA Broadband Terminal Adapter (B-ISDN)
B-TE Broadband Terminal Equipment (B-ISDN)
B/R Bridge/Router
B8ZS Binary Eight Zero Substitution
BA Balanced Asynchronous (HDLC)
BANCS Bell Administrative Network Communications System
BAS Basic Activity Subset
BAsize Buffer Allocation Size (DQDB, SMDS)
BBN Bolt, Beranak, and Newman
BBS Bulletin Board Service
Bc Committed Burst Size (FR)
BCC Block Calls Cleared (telephony)
BCC Block Check Character (BISYNC)
BCC Bus Control Card
BCD Binary Coded Decimal
BCD Blocked Calls Delayed (telephony)
BCDIC Binary Coded Decimal Interchange Code
BCLB Broadband Connectionless Bearer Service (ATM)
BCOB Broadband Connection-Oriented Bearer Service (ATM)
BCS Basic Combined Subset
BDT Telecommunications Development Bureau
Be Excess Burst Size (FR)
BECN Backward Explicit Congestion Notification (LAPF)
BERT Bit Error Rate Test
BEtag Beginning-End Tag (DQDB, SMDS)
BGP Border Gateway Protocol (IETF)
BGS Business and Government Services (USW !nterprise)
BHCA Busy Hour Call Attempts
BHCC Busy Hour Call Completions
BIB Backward Indicator Bit (SS7)
BIOS Basic Input/Output System
BIP Bit Interleaved Parity (SONET, SDH)
BISYNC Binary Synchronous Communications protocol (IBM)
BITNET Because It's Time Network
BIU Basic Information Unit
BLSR Bidirectional Line Switched Ring
BLU Basic Link Unit (SNA)
BNC Bayonet Neil Councilman
BNS Broadband Network Service
BOB Breakout Box
BOC Bell Operating Company
BOM Beginning of Message (DQDB, SMDS)
BPAD BISYNC Packet Assembler/Disassembler (PSPDN)
BPDU Bridge Protocol Data Unit (LAN)
BPRZ Bipolar Return to Zero
BPX Broadband Packet Exchange (StrataCom)
BRCS Business and Residence Centrex Services
BRE Bridge Relay Element
BRI Basic Rate Interface (ISDN)
BRITE Basic Rate Interface Transmission Equipment
BRLU Broadband Remote Line Unit
BRS Business Recovery Service
BSA Basic Service Arrangement
BSBH Busy Season Busy Hour (telephony)
BSC Binary Synchronous Communications protocol (IBM)
BSD Berkeley Software Distribution
BSE Basic Service Element
BSN Backward Sequence Number (SS7)
BSRF Basic System Reference Frequency
BSS Basic Synchronized Subset
BSS Broadband Switching System
BT Burst Tolerance (ATM)
BTA Basic Trading Area
BTAM Basic Telecommunications Access Method (SNA)
BTU Basic Transmission Unit
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-C-
C/R Command/Response (HDLC)
CAD Computer-Aided Design
CAE Computer-Aided Engineering
CAGR Compound Annual Growth Rate
CAM Computer-Aided Manufacturing
CAM Content-Addressable Memory
CAMEL Call Management Language
CAN Cosmopolitan Area Network
CAP Carrierless Amplitude/Phase modulation
CAP Competitive Access Provider
CAS Channel Associated Signaling
CASE Common Application Service Element
CASE Computer-Aided Software Engineering
CAT Computer-Aided Tomography
CATIA Computer-Assisted Three-dimensional Interactive Application
CATV Community Antenna Television
CBDS Connectionless Broadband Data Service (ETSI)
CBEMA Computer and Business Equipment Manufacturers Association
CBR Constant Bit Rate (ATM)
CBX Computerized Branch Exchange
CC Cluster Controller (IBM)
CC Connect Confirmation
CC Country Code (ITU-T)
CCG Central Clock Generator
CCIR International Radio Consultative Committee (ITU)
CCIS Common Channel Interoffice Signaling (AT&T)
CCITT International Telegraph and Telephone Consultative Committee (ITU)
CCNC Common Channel Signaling Network Control
CCR Commitment, Concurrency, and Recovery (Application Layer)
CCS Common Channel Signaling
CCS Hundred Call Seconds per Hour
CD Call Disconnect (SS7)
CD Collision Detection (LAN)
CD Compact Disc
CD-ROM Compact Disc-Read Only Memory
CDC Control Data Corporation
CDMA Code-Division Multiple Access
CDPD Cellular Digital Packet Data
CDVT Cell Delay Variation Tolerance (ATM)
CEI Comparably Efficient Interconnection
CEI Connection Endpoint Identifier (LAPD)
CEO Chief Executive Officer
CEPT Conference of European Postal and Telecommunications Administrations
CERN European Council for Nuclear Research
CERT Computer Emergency Response Team
CEV Controlled Environmental Vault
CFO Chief Financial Officer
CGM Computer Graphics Metafile
CHO Choke Packet
CIIII Computer Inquiry III (DOJ)
CIB CRC32 Indication Bit (DQDB, SMDS)
CIC Country Indicator Code
CICS Customer Information Control System
CIDR Classless Interdomain Routing (IETF)
CIDX Chemical Industry Data Exchange
CIM Computer Integrated Manufacturing
CIO Chief Information Officer
CIR Committed Information Rate (FR)
CIRC Cross Interleaved Reed-Solomon Code
CISC Complex Instruction Set Computer
CIX Commercial Internet Exchange
CLASS Custom Local Area Signaling Services (Bellcore)
CLID Calling Line Identification (ISDN, CLASS)
CLLM Consolidated Link Layer Management (FR)
CLNP Connectionless Network Protocol (ISO, ITU-T)
CLNS Connectionless Network Service (ISO, ITU-T)
CLP Cell Loss Priority (ATM)
CLTS Connectionless-mode Transport Service
CM Communications Module (AT&T 5ESS)
CM Connection Manager
CMIP Common Management Information Protocol (ISO, ITU-T)
CMISE Common Management Information Service Element (ISO, ITU-T)
CMOL CMIP Over LLC
CMOT CMIP Over TCP/IP
CMP Communications Module Processor
CMU Carnegie Mellon University
CN Common Name
CNE Certified NetWare Engineer
CNM Customer Network Management
CNMA Customer Network Management Agent
CNS Complementary Network Service
CO Central Office
CO Connection-Oriented
COLAN Central Office-based LAN
COM Continuation of Message (DQDB, SMDS)
COMC Communications Controller (SNA)
Companding Compressing/Expanding
CONS Connection-Oriented Network Service (ISO, ITU-T)
COS Corporation for Open Systems
COSE Common Open Software Environment
COT Central Office Terminal
CP Control Point
CP Coordination Processor
CPE Customer Premises Equipment
CPI/C Common Programming Interface for Communication
CPU Central Processing Unit
CR Connect Request (SS7)
CRC Cyclic Redundancy Check
CRS Configuration Report Server
CRT Cathode Ray Tube
CRV Call Reference Value (Q.931)
CS Convergence Sublayer (ATM)
CSA Carrier Serving Area
CSAA California State Automobile Association
CSDN Circuit Switched Data Network
CSMA Carrier Sense Multiple Access (LAN)
CSMA/CA Carrier Sense Multiple Access with Collision Avoidance (LAN)
CSMA/CD Carrier Sense Multiple Access with Collision Detection (LAN)
CSNET Computer Science Network
CSPDN Circuit Switched Public Data Network
CSU Channel Service Unit
CT Computerized Tomography
CT Cordless Telephone
CTIA Cellular Telecommunications Industry Association
CTS Clear To Send (EIA-232-E)
CU Control Unit
CVSD Continuously Variable Slope Delta modulation
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-D-
D/A Digital-to-Analog
D/C DLCI/Control (LAPF)
DA Destination Address (LAN)
DA Device Address (SNA)
DAC Dual Attachment Concentrator (FDDI)
DACS Digital Access and Cross-connect System
DAL Direct Access Line
DAP Data Access Protocol (DEC's DNA - Application Layer)
DAP Directory Access Protocol (AppleTalk)
DARPA Defense Advanced Research Projects Agency
DAS Dual Attachment Station (FDDI)
DASD Direct Access Storage Device
DAU Data Adapter Unit
DBMS Database Management System
DBS Direct Broadcast Satellite
DC Direct Current
DCA Digital Communications Associates
DCC Data Communications Channel (SONET)
DCE Data Circuit-terminating Equipment
DCE Distributed Computing Environment
DCER Data Circuit-terminating Equipment Ready
DCM Digital Circuit Multiplication (same as DSI)
DCN Data Communications Network
DCP Digital Communications Protocol
DCS Digital Communications System
DCS Digital Cross-connect System
DCS-1800 Digital Cordless Standard
DCT Discrete Cosine Transform
DD Database Description
DD Domain Directory
DDCMP Digital Data Communications Message Protocol (DNA)
DDD Direct Distance Dialing
DDM Digital Data Multiplexer
DDN Defense Data Network
DDP Datagram Delivery Protocol (AppleTalk)
DDS DATAPHONE® Digital Service (AT&T specific)
DDS Digital Data Service
DE Discard Eligibility (LAPF)
DECmcc DEC Management Control Center
DECT Digital European Cordless Telephone
DES Data Encryption Standard (NIST)
DF Don't Fragment (IP)
DFC Data Flow Control
DFS Distributed File System
DID Direct Inward Dialing
DILIC Dual Inline Integrated Circuit
DIP Dual Inline Package
DISC Disconnect
DL Data Link
DLC Digital Loop Carrier
DLCI Data Link Connection Identifier (LAPD, LAPF)
DLE Data Link Escape (BISYNC)
DLH Data Link Layer Header
DLM Distributed Lock Manager
DLS Data Link Switching (IBM)
DLT Data Link Layer Trailer
DLU Digital Line Unit
DM Delta Modulation
DM Disconnected Mode (HDLC)
DMA Direct Memory Access (computers)
DMAC Direct Memory Access Control
DMB Dynamic Multipoint Bridging
DME Distributed Management Environment
DMS Digital Multiplex Switch
DNA Digital Network Architecture
DNIC Data Network Identification Code (X.121)
DNS Domain Name System (IETF)
DNU Digital Networking Unit
DOD Direct Outward Dialing
DoD Department of Defense
DOE Department of Energy
DOJ Department of Justice
DOV Data Over Voice
DPC Destination Point Code (SS7)
DPSK Differential Phase Shift Keying
DQDB Distributed Queue Dual Bus (IEEE 802.6)
DRAD Digital Remote Antenna Driver
DRAM Dynamic Random Access Memory (RAM)
DS Digital Signal
DS Directory Synchronization
DSA Directory System Agent
DSAP Destination Service Access Point (LLC)
DSE Data Switching Equipment
DSG Data Systems Group
DSI Digital Speech Interpolation
DSL Digital Subscriber Line
DSMA Digital Sense Multiple Access
DSP Digital Signal Processing
DSP Display System Protocol (packet switching)
DSP Domain Specific Part
DSPU Downstream Physical Unit
DSR Data Set Ready
DSS Digital Subscriber Signaling system (ISDN, B-ISDN)
DSS Digital Switched Services
DSSS Direct Sequence Spread Spectrum
DSU Data Service Unit
DSX Digital System Cross-Connect
DTE Data Terminal Equipment
DTLU Digital Terminal Line Unit
DTMF Dual Tone Multifrequency
DTR Data Terminal Ready (EIA-232-E)
DTR DTE Ready (RS-232-C)
DTS Digital Transmission Systems
DTV Digital Television
DUA Directory User Agent
DVM Data over Voice Multiplexer
DVT Digital Video Terminal
DXI Data Exchange Interface (ATM, SMDS)
[Top]
-E-
E-TDMA Extended Time-Division Multiple Access
E/O Electrical-to-Optical
EA Address field Extension (HDLC)
EARN European Academic Research Network
EBCDIC Extended Binary Coded Decimal Interchange Code
EC European Community
ECMA European Computer Manufacturer Association
ECN Explicit Congestion Notification (FR)
ECSA Exchange Carriers Standards Association
ED Ending Delimiter (LAN)
EDI Electronic Data Interchange (ANSI)
EDIFACT Electronic Data Interchange For Administration, Commerce,
and Trade (ANSI)
EDP Electronic Data Processing
EEO Extremely Elliptical Orbit
EFCI Explicit Forward Congestion Indicator (ATM)
EFM Eight-Fourteen Modulation
EFS End-of-Frame Sequence (LAN)
EGP Exterior Gateway Protocol (IETF)
EHF Extremely High Frequency
EHP Electron-Hole Pairs
EI Expansion Interface
EIR Excess Information Rate (FR)
EIA Electronics Industry Association
EISA Extended Industry Standard Architecture
ELAP EtherTalk Link Acces Protocol (AppleTalk)
ELF Extremely Low Frequency
EMA Enterprise Management Architecture
EMBARC Electronic Mail Broadcast to a Roaming Computer
EMG Extension Module Group
EMI Electromagnetic Interference
EMS Element Management System (Network Mgmt.)
EMS Expanded Memory Specification
EN Egress Node
EN End Node
ENIAC Electronic Numerical Integrator and Calculator
ENQ Enquiry
ENS Enterprise Network Services
EO End Office
EOB End of Bus (DQDB)
EOC Embedded Operations Channel (SONET)
EOD End of Dialing
EOM End of Message (DQDB, SMDS)
EOT End of Transmission (BISYNC)
EPROM Erasable Programmable Read Only Memory
ER Egress Router
ES Echo Suppressor
ES End-System (ISO)
ES-IS End System-Intermediate System
ESCON Enterprise System Connection (IBM)
ESDI Enhanced Small Device Interface
ESF Extended Superframe Format (T-1)
ESIG European SMDS Interest Group
ESMR Enhanced Specialized Mobile Radio
ESN Equipment Serial Number
ESP Enhanced Service Provider
ESS Electronic Switching System
ETB End of Text Block (BISYNC)
ETC Exchange Terminal Circuit
ETR Early Token Release (Token Ring, FDDI)
ETSI European Telecommunications Standards Institute
ETX End of Text (BISYNC)
EUnet European UNIX Network
EWOS European Workshop for Open Systems
[Top]
-F-
f Frequency
FAQ Frequently Asked Questions
FAS Frame Alignment Sequence (T-1)
FAT File Allocation Table (Operating Systems)
FB Framing Bit
FCC Federal Communications Commission
FCC Forward Control Channel
FCIF Full Common Intermediate Format
FCS Frame Check Sequence (Data Link Protocols)
FDA Food and Drug Administration
FDDI Fiber Distributed Data Interface (ANSI)
FDM Frequency-Division Multiplexing
FDMA Frequency-Division Multiple Access
FDX Full-Duplex
FEC Forward Error Correction
FECN Forward Explicit Congestion Notification (LAPF)
FEP Front End Processor (IBM)
FET Field Effect Transistor
FFS For Further Study
FG Frame Ground
FGD Feature Group D
FH Frame Handler
FIB Forward Indicator Bit (SS7)
FID Format Identification (SNA)
FIFO First In First Out
FIPS Federal Information Processing Standards (mandated for RFPs
effective 8/15/90)
FIRP Federal Internetworking Requirements Panel
FITL Fiber In The Loop
FM Frequency Modulation
FM Function Management
FOIRL Fiber Optic Inter-Repeater Link
FOTS Fiber Optic Transmission System
FQPCID Fully Qualified Procedure Correlation Identifier
FR Frame Relay
FRAD Frame Relay Access Device
FRF Frame Relay Forum
FRMR Frame Reject (HDLC)
FRP Fragmentation Protocol (VINES)
FRS Frame Relay Service
FRS Frame Relay Switch
FS Frame Status
Fs Signal Framing Bits (T-1)
FSK Frequency Shift Keying
FSN Forward Sequence Number (SS7)
FSS Fixed Satellite Service
Ft Terminal Framing Bits (T-1)
FT-1 Fractional T-1
FTAM File Transfer, Access, and Management (ISO)
FTP File Transfer Protocol (IETF)
FTTC Fiber to the Curb
FTTH Fiber to the Home
FUNI Frame User-Network Interface (ATM)
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-G-
GE General Electric
GEO Geosynchronous Earth Orbit
GEOS Geosynchronous Earth Orbit Satellites
GFC Generic Flow Control (ATM)
GFI General Format Identifier (X.25)
GFLOPS One Billion Floating Point Operations per Second
GIO Generic Interface for Operations (SMDS)
GOSIP Government Open Systems Interconnection Profile
GPS Global Positioning System
GRIN Graded-Index Fiber
GSA General Services Administration
GSM Global System for Mobile Communications
GSS Group Switching Subsystem
GUI Graphical User Interface
[Top]
-H-
HCM High Capacity Multiplexing
HCS Header Check Sequence
HCSPR Hundred Call Seconds Per Hour
HCV High Capacity Voice
HDB3 High Density, Bipolar 3
HDLC High-level Data Link Control (ISO)
HDSL High-bit-rate Digital Subscriber Line
HDT Host Digital Terminal
HDTM Half-Duplex Transmission Module (X.25)
HDTV High Definition Television
HDX Half-Duplex
HE Header Extension (DQDB, SMDS)
HEC Header Error Control (ATM)
HEL Header Extension Length (DQDB, SMDS)
HeNe Helium-Neon
Hex Hexadecimal
HF High Frequency
HFC Hybrid Fiber/Coax
HFS Hierarchical File Storage
HIBCC Health Industry Business Communications Council
HILI Higher Layers and Internetworking (IEEE 802)
HLL High Level Language
HLM Heterogeneous LAN Manager
HLPI Higher Layer Protocol Identifier (DQDB, SMDS)
HLR Home Location Register
HMA High Memory Area
HMW High Molecular Weight
HNPA Home Numbering Plan Area
HOB Head of Bus (DQDB)
HOSTID Host Identifier
HP/UX HP's Version of UNIX Operating System
HPAD Host Packet Assembler/Disassembler (BPAD)
HPC High Performance Computing
HPFS High Performance File System
HPR High Performance Routing
HQ Headquarters
HS High Speed
HSLAN High Speed LAN
HSC Hierarchical Storage Controller
HSSI High-Speed Serial Interface (ANSI)
HT Holding Time
HTTP HyperText Transfer Protocol (IETF)
HTU HDSL Transmission Unit
[Top]
-I-
I Intrapictures (MPEG)
I/G Individual/Group (MAC)
I/O Input/Output
IA5 International Alphabet #5 (ITU-T)
IAB Internet Architecture Board (formerly Activities)
IACS Integrated Access and Crossconnect System
IAM Initial Address Message (SS7)
IAM Initial Address Message (SS7)
IANA Internet Address Naming Authority
IC Integrated Circuit
ICB Individual Case Basis
ICCB Internet Control and Configuration Board
ICI Inter-carrier Interface (SMDS)
ICI Interexchange Carrier Interface (Bellcore)
ICMP Internet Control Message Protocol (IETF)
ICP Internet Control Protocol
IDCT Inverse Discrete Cosine Transform (DCT)
IDE Intelligent Drive Electronics
IDF Intermediate Distribution Frame
IDI Initial Domain Identifier (ISO)
IDN Integrated Digital Network
IDNX Integrated Digital Network Exchange
IDP Internet Datagram Protocol
IDS Information Display System (BISYNC)
IE Information Element (ISDN/B-ISDN DSS)
IEC Interexchange Carrier
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers
IESG Internet Engineering Steering Group
IETF Internet Engineering Task Force
IFC Installed First Cost
IFRB International Frequency Registration Board
IGES Initial Graphics Exchange Specification
IGOSS
Industry/Government Open Systems Specification
IGP Interior Gateway Protocol (IETF)
IGRP Interior Gateway Routing Protocol (Cisco)
IHL Internet Header Length (IP)
ILD Injection Laser Diode
IMP Interface Message Processor (ARPANET)
IMTS Improved Mobile Telephone Service
IMUX Intelligent Multiplexer
IN Ingress Node
IN Intelligent Network (AIN)
InARP Inverse Address Resolution Protocol (IETF)
INL Internodal Link
INMARSAT International Maritime Satellite Organization
INP Internet Nodal Processor
InterNIC Internet Network Information Center
IOP Input/Output Processor
IP Intelligent Peripheral (AIN)
IP Internet Protocol (IETF)
IPC Interprocess Communication
IPS Instructions per Second
IPX Internet Packet Exchange (NetWare)
IR Infrared
IR Ingress Router
IR Instruction Register
IRA Individual Retirement Account
IRDS Information Resource Dictionary System
IRM Inherited Rights Mask
IRP Individual Routing Processor
IRQ Interrupt Request
IRSG Internet Research Steering Group
IRTF Internet Research Task Force
IS Information Systems
IS Interim Standard (ISO)
IS Intermediate System (ISO)
IS-IS Intermediate System-Intermediate System (ISO)
ISA Industry Standard Architecture
ISAM Index Sequential Access Method
ISDN Integrated Services Digital Network
ISI USC Information Sciences Institute
ISLAN Integrated Services LAN (IEEE 802.9)
ISLU ISDN Line Unit (AT&T 5ESS)
ISM Industrial, Scientific, and Medical
ISN Information Systems Network
ISO International Organization for Standardization
ISP Internet Service Provider
ISR Intermediate Session Routing
ISSI Interswitching System Interface (SMDS)
ISSIP Interswitching System Interface Protocol
ISUP ISDN User Part (SS7)
ISV Independent Software Vendor
IT Information Technology
IT Information Type
ITAC-T International Telecommunications Advisory Committee-Telecommunications
ITB Intermediate Text Block (BISYNC)
ITN Independent Telecommunication Network
ITU International Telecommunication Union
ITU-D International Telecommunication Union-Telecommunication
Development Sector (formerly BDT)
ITU-R International Telecommunication Union-Radio Communication
Sector (formerly CCIR and IFRB)
ITU-T International Telecommunication Union-Telecommunication
Standardization Sector (formerly CCITT)
IVD Internal Vapor Deposition
IVDM Integrated Voice Data Multiplexer
IVR Interactive Voice Response
IVS Interactive Video Services
IWF Interworking Connection
IWU Interworking Unit (B-ISDN)
[Top]
-J-
JIT Just in Time
JPEG Joint Photographic Experts Group (ISO)
JvNCnet John von Neumann Computer Center Network
JTM Job Transfer and Management
JUNET Japan UNIX Network
[Top]
-K-
K/D Keyboard/Display
[Top]
-L-
LADS Local Area Data Service
LAN Local Area Network
LAP Link Access Procedure (X.25)
LAPB Link Access Procedure Balanced (X.25)
LAPD Link Access Procedure for the D-channel (ISDN)
LAPF Link Access Procedure to Frame Mode Bearer Services (FR, ISDN)
LAPF-Core Core Aspects of the Link Access Procedure to Frame Mode
Bearer Services (FR, ISDN)
LAPM Link Access Procedure for Modems (V.42)
LAPX Link Access Procedure half-duplex (X.32)
LASS Local Area Signaling Services
LAT Local Area Transport (DEC)
LATA Local Access and Transport Area
LAVC Local Area VAX Cluster (DEC)
LBT Listen Before Talk
LC Logical Channel
LCD Liquid Crystal Display
LCGN Logical Channel Group Number (X.25)
LCM Line Concentrator Module
LCN Logical Channel Number (X.25)
LD Laser Diode
LD Local Directory
LDDI Local Distributed Data Interface (ANSI)
LE Local Exchange (ISDN)
LE/PH Local Exchange/Packet Handler (ISDN)
LEC Local Exchange Carrier
LED Light Emitting Diode
LEN Length
LEN Low Entry Networking
LEO Low Earth Orbit
LEOS Low Earth Orbit Satellites
LF Largest Frame
LF Low Frequency
LFSID Local Form Session Identifier
LGC Line Group Controller
LH Link Header
LI Length Indicator
LIDB Line Information Database (ISDN)
LIFO Last In First Out
LIPX Large Internet Packet Exchange (NetWare)
LLAP LocalTalk Link Access Protocol (Apple)
LLC Logical Link Control (IEEE 802.2)
LLI Logical Link Identifier
LMDS Local Multipoint Distribution System
LMI Local Management Interface
LOH Line Overhead (SONET)
LOP Line of Position
LOS Line of Sight
LP Link Printer
LPC Linear Predictive Coding
LPDA2 Link Problem Determination Aid 2 (IBM)
LPP Lightweight Presentation Protocol
LPP Link Peripheral Processor
LPVS Link Packetized Voice Subsystem
LRC Longitudinal Redundancy Check (BISYNC)
LS Link State
LSB Least Significant Bit
LSI Large Scale Integration
LSL Link Support Layer
LT Link Trailer
LTE Line Terminating Equipment (SONET)
LTG Line Trunk Groups
LU Line Unit
LU Logical Unit (SNA)
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-M-
M2M Manager-to-Manager
MAC Media Access Control (IEEE 802)
MAN Metropolitan Area Network
MAP Maintenance Administration Panel
MAP Management Application Protocol
MAP Manufacturing Automation Protocol (GM)
MAR Memory Address Register
MAU Medium Attachment Unit (Ethernet)
MAU Multistation Access Unit (Token Ring)
MB Message Buffer
MCA MicroChannel Architecture (IBM)
MCI Microwave Communications, Inc.
MCR Minimum Cell Rate (ATM)
MDB Management Database
MDBS Mobile Database Station
MDF Main Distribution Frame
MDI Medium-Dependent Interface
MDR Memory Data Register
MDS Multipoint Distribution Services
MED Modem Equivalent Device
MEO Medium Earth Orbit
MEOS Medium Earth Orbit Satellites
M-ES Mobile End System
MF Media Filter
MF Medium Frequency
MF More Fragments (IP)
MF Multifrequency
MFJ Modified Final Judgement
MFLOPS Millions of Floating point Operations Per Second
MFS Metropolitan Fiber Systems
MHS Message Handling System (X.400)
MIB Management Information Base (Network Mgmt.)
MIC Medium Interface Connector (FDDI)
MID Message Identifier (ATM, SMDS)
MID Multiplexing Identifier (ATM)
MIMD Multiple Instruction stream, Multiple Data stream
MIME Multipurpose Internet Mail Extensions (IETF)
MIN Mobile ID number
MIPS Millions of Instructions Per Second
MIS Management Information Systems
MIT Massachusettes Institute of Technology
MITI Ministry of International Trade and Industry (Japan)
MLC Multilink Control Field (X.25)
MLID Multiple Link Interface Driver
MLM Multi-Longitudinal Mode
MLP Multilink Protocol (X.25)
MLS Multiple Listing Service
MMDS Multichannel, Multipoint Distribution System
MMF Multimode Fiber
MMS Manufacturing Message Specification
MMU Memory Management Unit
MNPVC Multinetwork PVC (FR NNI)
M/N/T Main/Satellite/Tributary Network
MOP Maintenance Operations Protocol
MOSFET Metal Oxide Semiconductor Field Effect Transistor
MPEG Motion Picture Experts Group (ISO)
MPR Multiprotocol Router
MPTN Multiprotocol Transport Network
MPX Multiprocessor Extension
MRI Magnetic Resonance Imaging
MS Message Store
MSB Most Significant Bit
MSC Mobile Switching Center
MSG Message
MSO Mobile Switching Office
MSO Multiple Systems Operator
MSP Marketing and Sales Productivity
MSS Maximum Segment Size (TCP)
MSS Mobile Satellite Systems
MST Multislotted Token
MSVC Meta-Signaling Virtual Channel
MTA Major Trading Area
MTA Message Transfer Agent
MTBF Mean Time Between Failure
MTP Message Transfer Part (SS7)
MTS Message Transfer System
MTTR Mean Time to Repair
MTU Maximum Transmission Unit (TCP)
MVS Multiple Virtual Storage
[Top]
-N-
N(R) Receive Sequence Number of Frame (HDLC)
N(S) Send Sequence Number of Frame (HLDC)
N-AMPS Narrowband Advanced Mobile Phone System
N-ISDN Narrowband Integrated Services Digital Network (ISDN)
NA Numerical Aperture
NABER National Association of Business and Educational Radio
NAC Null Attachment Concentrator (FDDI)
NAK Negative Acknowledgement (BISYNC, DDCMP)
NANP North American Numbering Plan
NAP Network Access Point (Internet)
NAS Network Application Support
NASA National Aeronautics and Space Administration
NASDAQ National Association of Securities Dealers Automated Quotations
NATA North American Telecommunications Association
NAU Network Accessible Unit (SNA)
NBP Name Binding Protocol (NetWare)
NBS National Bureau of Standards (now NIST)
NC Number of unallocated channels at node
NCCF Network Communication Control Facility
NCP NetWare Core Protocol (NetWare)
NCP Network Control Program (SNA)
NCP Network Control Protocol
NCS Network Computing System
NCTA National Cable Television Association
NCTE Network Channel Terminating Equipment
NDIS Network Driver Interface Specifications (Microsoft & 3Com)
NDS Netware Directory Services
NE Network Element
NEARnet New England Academic and Research Network
NEAT Network Expert Advisory Tool (Harris Corp.)
NED NetView - DECnet Interface Option
NetBEUI NetBIOS Extended User Interface (IBM)
NetBIOS Network Basic Input/Output System (BIOS)
NETID Network Identifier
NetRPC Network Remote Procedure Call (Sun)
NFS Network File System (Sun)
NI Network Interface
NIC Network Interface Card (LAN)
NICE Network Information and Control Exchange
NIST National Institute of Standards and Technology (formerly
NBS)
NIU Network Interface Unit (T-carrier)
NIUF North American ISDN Users Forum
NL Network Layer
NL Number of unallocated channels on link
NLDM Network Logical Data Manager
NLM NetWare Loadable Module
NLPID Network Layer Protocol Identifier
NLSP NetWare Link Services Protocol
NM Network Management
NM Network Module
NMC Network Management Center
NMP Network Management Protocol
NMS Network Management Systems
NMVT Network Management Vector Transport protocol
NN Network Node
NNI Network Node Interface (ATM)
NNI Network-to-Network Interface (FR)
NOC Network Operations Center
NOCC Network Operations Control Center
NOS Network Operating System
NPA Numbering Plan Area
NPDA Network Problem Determination Application
NPDU Network Layer Protocol Data Unit
NPI Numbering Plan Identification
NPSI NCP Packet Switching Interface (SNA)
NRC Non-Recurring Charges
NREN National Research and Education Network
NRZ Non-Return to Zero
NRZI Non-Return to Zero Inverted
NS/DOS Networking Services/DOS
NSA National Security Agency
NSA National Security Association
NSAP Network Service Access Point (ISO)
NSF National Science Foundation
NSFnet National Science Foundation Network
NSP Network Service Protocol
NT Network Termination (ISDN)
NT New Technology
NT Node Type
NTAS New Technology Advanced Server (Microsoft)
NTO Network Terminal Option
NTSC National Television System Committee
NTT Nippon Telephone and Telegraph
NUI Network User Identification (X.25)
NVE Network-Visible Entities
NVOD Near Video On Demand
NVRAM Nonvolatile Random Access Memory (RAM)
NWDA National Wholesale Drug Association (pioneering EDI standards
for pharmacists & suppliers)
[Top]
-O-
O/E Optical-to-Electrical
OAM Operations, Administration, and Maintenance
OAM&P Operations, Administration, Maintenance, and Provisioning
OC Optical Carrier (SONET)
OCC Other Common Carriers
OCCA Open, Cooperative Computing Architecture
ODA Open Document Architecture
ODI Open Data-link Interface (Novell)
ODIF Open Document Interchange Format
OEM Original Equipment Manafacturer
OID Object Identifier
OLC Optical Loop Carrier
OLTP OnLine Transaction Processing
OMAP Operations, Maintenance, and Administration Part (SS7)
ONA Open Network Architecture
ONC Open Network Computing
ONMS Open Network Management System
ONU Optical Network Unit
OOP Object-Oriented Programming
OOPS Object-Oriented Programming System
OPC Origination Point Code (SS7)
ORM Optically Remote switching Module
OS Operating System
OSF Open Software Foundation
OSI Open Systems Interconnection (ISO, ITU-T)
OSIRM Open Systems Interconnection Reference Model (ISO, ITU-T)
OSI/CS OSI/Communications Subsystem
OSI/FS OSI File Services
OSI/NMF OSI Network Management Forum
OSINET OSI Network
OSO Originating Screening Office
OSPF Open Shortest Path First (IETF)
OSS Operation Support Systems
OTF Open Token Foundation
OU Organizational Unit
OUI Organizationally Unique Identifier (SNAP)
OVD Outside Vapor Deposition
OVw OpenView Windows
[Top]
-P-
P Predicted Pictures (MPEG)
P(R) Receive Sequence Number of packet (PLP)
P(S) Send Sequence Number of packet (PLP)
P.O. Purchase Order
P/F Poll/Final (HDLC)
PA Preamble (LAN)
PACS Personal Access Communications System
PAD Packet Assembler/Disassembler (X.25)
PAM Pulse Amplitude Modulation
PANS Pretty Amazing New Stuff (B-ISDN)
PAP Printer Access Protocol
PAP Process/Application Protocol
PAR Positive Acknowledgement with Retransmission
PARC Xerox Palo Alto Research Center
PBX Private Branch Exchange
PC Program Counter
PCB Process Control Block
PCI Peripheral Components Interface
PCIO Program Controlled I/O
PCM Pulse Code Modulation
PCMCIA Personal Computer Memory Card International Association
PCN Personal Communications Network
PCNE Protocol Converter for Non-SNA Equipment
PCR Peak Cell Rate (ATM)
PCS Personal Communications Services
PCU Premises Control Unit
PD Propagation Delay
PDA Personal Digital Assistant
PDM Physical Medium Dependent (FDDI)
PDN Public Data Network
PDS Premises Distribution System
PDU Protocol Data Unit
PEL Picture Element
PEP Partitioned Emulation Program
PF Polycenter Framework
PH Packet Handler (ISDN)
Pho Photonic
PHY Physical Layer
PIC Polyolefin Insulated Cable
PIC Programmable Interrupt Controller
PID Protocol Identifier (SNAP)
PIDX Petroleum Industry Data Exchange
PIN Positive Intrinsic Negative
PIU Path Information Units (SNA)
PLCP Physical Layer Convergence Protocol (DQDB)
PLP Packet Layer Protocol (X.25)
PLU Primary Logical Unit
PM Peripheral Modules
PM Phase Modulation
PM Physical Medium
PMA Physical Medium Attachment
PMD Physical Medium Dependent (FDDI)
POD Programmable Option Devices
POH Path Overhead (SONET)
POP Point of Presence
POS Point of Sale
POSI Promotion of OSI
POSIT Profiles for Open Systems Interworking Technologies
POSIX Portable Operating System Interface for UNIX
POST Power-On Self Test
POTS Plain Old Telephone Service
PP Payload Pointer
PPDU Presentation Protocol Data Unit
ppm Pulses per Minute
PPP Point-to-Point Protocol (IETF)
PPS Packets Per Second
pps pulse per second
PRC Primary Reference Clock
PRI Primary Rate Interface (ISDN)
PROFS Professional Office System
PROM Programmable Read Only Memory
PRSIG Pacific Rim SMDS Interest Group
PSB Public Service Board
PSC Public Service Commission
PSDN Packet Switched Data Network
PSI Packet Switching Interface (DNA)
PSK Phase Shift Keying
PSPDN Packet Switched Public Data Network
PSTN Public Switched Telephone Network
PSW Program Status Word
PTE Path Terminating Equipment (SONET)
PTI Packet Type Identifier (X.25)
PTI Payload Type Identifier (ATM)
PTM Packet Transport Mode
PTN Public Telephone Network
PTT Post, Telephone, and Telegraph
PU Physical Unit (SNA)
PUC Public Utility Commission
PVC Permanent Virtual Circuit
PVN Private Virtual Network
[Top]
-Q-
Q-bit Qualified data bit (X.25)
QAM Quadrature Amplitude Modulation
QASPR QUALCOMM Automatic Satellite Position Reporting
QCIF Quarter Common Intermediate Format
QLLC Qualified Logical Link Control (SNA)
QOS Quality of Service
QPSK Quadrature Phase Shift Keying (DQDB)
QPSX Queued Packet Synchronous Exchange
[Top]
-R-
R R reference point (ISDN)
R Router
R&D Research & Development
RAID Redundant Array of Inexpensive Disks
RAM Random Access Memory
RARP Reverse Address Resolution Protocol (IETF)
RBOC Regional Bell Operating Company
RC Receiver Signal Element Timing (EIA-232-E)
RCC Reverse Control Channel
RCE Remote Channel Extenders
RCF Routing Control Field
RCVR Receiver Sequence Number
RD Received Data (EIA-232-E)
RD Request Disconnect (HDLC)
RDF Route Designator Field
RDSS Radio Determination Satellite Service
RDTD Restricted Differential Time Delay
REJ Reject (HDLC)
REM Ring Error Monitor
REP Repeat
RESP Response
RET Returning
RF Radio Frequency
RFC Request For Comments (IETF)
RFH Remote Frame Handler (ISDN)
RFI Radio Frequency Interference
RFP Request For Proposal
RG Research Group
RG Ring Ground
RH Request/Response Header
RHC Regional Holding Company
RI Ring In (Token Ring MAU)
RI Ring Indicator (EIA-232-E)
RIF Routing Information Field (Source Routing)
RII Routing Information Indicator (Source Routing)
RIM Request Initializaiton Mode (HDLC)
RIP Routing Information Protocol (IETF)
RIPE Réseau IP Européen
RISC Reduced Instruction Set Computer
RJE Remote Job Entry
RLSD Received Line Signal Detect (EIA-232-E)
RMDR Remainder
RMON Remote Network Monitoring
RNA Ribonucleic Acid
RNR Receiver Not Ready (HDLC)
RO Ring Out (Token Ring MAU)
ROM Read-Only Memory
ROMP Remote Operations Microprocessor
ROR Rate of Return
ROSE Remote Operation Service Element (Application Layer)
RPC Remote Procedure Call
RPOA Recognized Private Operating Agency
RPS Ring Parameter Server
RR Receiver Ready (HDLC)
RRQ Return Request
RSA Rivest, Shamir, Adleman (encryption)
RSCS Remote Time Spooling Communications Subsystem
RSCV Route Selection Control Vector
RSM Remote Switching Module (telephony)
RSS Remote Switch Subsystem
Rsvd Reserved
RSX Real-Time Resource Sharing Executive
RT Remote Terminal
RT Rotation Time
RT Routing Type
RTMP Routing Table Maintenance Protocol (AppleTalk)
RTP Routing Update Protocol (VINES)
RTS Request To Send (EIA-232-E)
RTSE Remote Transfer Service Element (Application Layer)
RU Request/Response Unit
RVI Reverse Interrupt (BISYNC)
RW Receiver Window
[Top]
-S-
S S reference point (ISDN)
S-MIC STP Medium Interface Connector (Token Ring MAU)
S/DMS SONET/Digital Multiplex System
S/N Signal-to-Noise Ratio
SA Source Address
SA Subarea
SAA Systems Application Architecture (IBM)
SAAL Signaling ATM Adaptation Layer (ATM)
SABM Set Asynchronous Balanced Mode (HDLC)
SABME Set Asynchronous Balanced Mode Extended (HDLC)
SAC Single Attachment Concentrator (FDDI)
SAP Service Access Point (generic)
SAP Service Advertising Protocol (NetWare)
SAPI Service Access Point Identifier (LAPD)
SAR Segmentation and Reassembly (ATM)
SARM Set Asynchronous Response Mode (HDLC)
SAS Single Attachment Station (FDDI)
SASE Specific Applications Service Element (subset of CASE, Application
Layer)
SB Signal Battery
SBI Synchronous Backplane Interface
SCA System Communication Architecture
SCAI Switch-to-Computer Applications Interface
SCCP Signaling Connection Control Point (SS7)
SCO Santa Cruz Operation
SCP Service Control Point (SS7)
SCP Session Control Protocol
SCR Sustained Cell Rate (ATM)
SCSI Small Computer Systems Interface
SCTE Serial Clock Transmit External (EIA-232-E)
SD Starting Delimiter (LAN)
SDH Synchronous Digital Hierarchy (ITU-T)
SDLC Synchronous Data Link Control (IBM)
SDM Space-Division Multiplexing
SDS Scientific Data Systems
SDSU SMDS Data Service Unit
SDTV Standard Definition (digital) Television
SDU Service Data Unit
SE Status Enquiry (FR)
Sec Section
SECAM Sequential Color with Memory
Seq# Sequence Number
SF Single Frequency
SF Status Field
SF Superframe Format (T-1)
SFS Start of Frame Sequence (LAN)
SG Signal Ground
SG Study Group (ITU-T)
SGML Standard Generalized Markup Language
SGMP Simple Gateway Management Protocol (IETF)
SHARP Self-Healing Alternate Route Protection
SHF Super High Frequency
SHNS Self-Healing Network Service
SID System ID number
SIF Signaling Information Field
SIG SMDS Interest Group
SIG Special Interest Group
SILS Standard for Interoperable LAN Security (IEEE 802.10)
SIM Set Initialization Mode (HDLC)
SIMD Single Instruction stream, Multiple Data stream
SIO Scientific and Industrial Organizations (ITU-T)
SIO Service Information Octet
SIP SMDS Interface Protocol
SIR Sustained Information Rate (SMDS)
SITA Society of International Aeronautical Telecommunications
SJF Shortest Job First
SLC Subscriber Loop Carrier
SLEE Service Logic Execution Environment
SLIP Serial Line Interface Protocol (IETF)
SLM Single Longitudinal Mode
SLP Single-Link Procedures (X.25)
SLU Secondary Logical Unit
SM Switching Module (AT&T 5ESS)
SMAP System Management Application Part
SMB Server Message Block
SMDS Switched Multimegabit Data Service (Bellcore)
SMF Single-Mode Fiber
SMP Simple Management Protocol
SMP Switching Module Processor
SMP Symmetric Multiprocessing
SMR Specialized Mobile Radio
SMTP Simple Mail Transfer Protocol (IETF)
SN Sequence Number (ATM, DQDB, SMDS)
SN Switching Network
SNA Systems Network Architecture (IBM)
SNADS SNA Distributed Services
SNAP Subnetwork Access Protocol (IEEE 802)
SNDR Sender
SNI Subscriber Network Interface (SMDS)
SNMP Simple Network Management Protocol (IETF)
SNMPv2 Simple Network Management Protocol version 2 (IETF)
SNP Sequence Number Protection
SNRM Set Normal Response Mode (HDLC)
SNRME Set Normal Response Mode Extended (HDLC)
SOH Section Overhead (SONET)
SOH Start of Header (BISYNC)
SONET Synchronous Optical Network (BISYNC)
SP Signaling Point (ANSI)
SPA Specific Poll Address (SS7)
SPAG Standards Promotion and Application Group (BISYNC)
SPAN Space Physics Analysis Network
SPARC Scalable Performance Architecture
SPCL Spectrum Cellular
SPDU Session Protocol Data Unit
SPE Synchronous Payload Envelope (SONET)
SPF Shortest Path First
SPID Service Profile Identifier (ISDN)
SPM Space Switch Module
SPP Sequenced Packet Protocol (NetWare)
SPTN Single Protocol Transport Network
SPX Sequenced Packet Exchange (NetWare)
SQ Signal Quality Detector (EIA-232-E)
SQL Structured Query Language
SR Source Routing (IBM)
SR-TB Source Routing-Transparent Bridging (IEEE)
SRAM Static Random Access Memory (RAM)
SRD Secondary Received Data (EIA-232-E)
SREJ Selective Reject (HDLC)
SRF Specifically Routed Frames (Token Ring SR)
SRI SIP Relay Interface (SMDS)
SRT Source Routing Transparent
SS Spread Spectrum
SS Switching System (SMDS)
SS6 Signaling System 6
SS7 Signaling System 7
SSA Station Select Address (BISYNC)
SSAP Session Service Access Point (LLC)
SSB Single Sideband
SSBSC Single Sideband Suppressed Carrier
SSCP System Services Control Point
SSM Single Segment Message (DQDB, SMDS)
SSP Service Switching Point (SS7)
SSP Siemens Switching Processor
SSS Subscriber Switching Subsystem
SST Synchronous Service Transport
ST Segment Type (DQDB, SMDS)
ST Signaling Terminal
STA Spanning Tree Algorithm (LAN)
STACK Start Acknowledgement
STD Secondary Transmitted Data (EIA-232)
STDM Statistical Time-Division Multiplexing
STE Section Terminating Equipment (SONET)
STE Signaling Terminal (V.75)
STE Signaling Terminal Equipment
STE Spanning-Tree Explorer (LAN)
STM Synchronous Transfer Mode
STM Synchronous Transport Module (SDH)
STP Service Traffic Position
STP Shielded Twisted Pair (Physical Layer)
STP Signal Transfer Point (SS7)
STP Spanning Tree Protocol (Data Link, Bridges)
STS Synchronous Transport Signal (SONET)
STX Start of Text (BISYNC)
SVC Signaling Virtual Channel (ATM)
SVC Switched Virtual Circuit (Packet Switching)
SVI Subvector Identifier
SVV Subvector Value
SXS Step-by-Step (Switching)
SYN Synchronization
SYNTRAN Synchronous Transmission
[Top]
-T-
T T reference point (ISDN)
T Tip
TA Terminal Adapter (ISDN)
TAG Technical Advisory Group (IEEE 802)
TAM Timer Active Monitor
TASI Time Assigned Speech Interpolation
TAXI Transparent Asynchronous Transmitter/Receiver Interface (Physical Layer)
TB Transparent Bridging
TC Transmission Control
TC Transmitted Signal Element Timing (DCE Source, EIA-232)
TC Transport Connection
Tc Committed Rate Measurement Interval (FR)
TCAM Telecommunications Access Method (SNA)
TCAP Transaction Capabilities Application Part (SS7)
TCIF Telecommunications Industry Forum
TCM Time Compression Multiplexing
TCM Trellis Coding Modulation
TCN Topology Change Notification
TCP Transmission Control Protocol (IETF)
TCU Telecommunications Control Unit (SNA)
TCU Trunk Coupling Unit
TD Transmitted Data (EIA-232-E)
TDCC Transportation Data Coordination Committee
TDD Time-Division Duplexing
TDM Time-Division Multiplexing
TDMA Time-Division Multiple Access
TDR Time Domain Reflectometer
TDX Time Delay to X
TDY TIme Delay to Y
TE Terminal Equipment (ISDN)
TE1 Terminal Equipment type 1 (ISDN capable)
TE2 Terminal Equipment type 2 (non-ISDN)
TEI Terminal Endpoint Identifier (LAPD)
TH Transmission Header
THT Token Holding Timer (FDDI, Token Ring)
TIA Telecommunications Industry Association
TL1 Transaction Language-1
TLAP TokenTalk Link Access Protocol (Apple)
TLB Translation Lookaside Buffer
TLH Transport Layer Header
TLP Transmission Level Point
TLS Transparent LAN Service
TM Terminal Multiplexer
TMS Time-Multiplexed Switch
TMS Transport Management System
TN Transit Node
TOA Type of Address (X.25)
TOH Transport Overhead (SONET)
TOP Technical and Office Protocol (Boeing)
TOPS Traffic Operator Position System
TOS Type of Service (IP)
TP Transaction Processing
TP Transport Protocol (ISO)
TP Twisted Pair
TP-PMD Twisted Pair Physical Medium Dependent (FDDI)
TPAD Terminal Packet Assembler/Disassembler (BISYNC-BPAD)
TPAU Twisted Pair Attachment Unit
TPDU Transport Protocol Data Unit
TR Token Ring
TRA Traffic Routing Administration
TRSS Token Ring Subsystem
TRT Token Rotation Timer (FDDI, Token Ring)
TSAP Transport Service Access Point
TSAT T-1 rate Small Aperture Terminal
TSI Time Slot Interchange
TSM Time Switch Module
TSM Timer Standby Monitor
TSO Terminating Screening Office
TSR Terminate and Stay Resident
TSS Telecommunication Standardization Sector (ITU-T)
TSS Trunk and Signaling Subsystem
TSSI Time Slot Sequence Integrity
TST Time-Space-Time (Switching Process)
TSTS Time-Space-Time-Space
TTD Temporary Text Delay (BISYNC)
TTL Transistor-Transistor Logic
TTP Timed Token Protocol (FDDI)
TTRT Target Token-Rotation Time (FDDI)
TU Trunk Unit
TUP Telephone User Part (SS7)
TW Transmitter Window
TWA Two-Way Alternate (HDLC)
TWS Two-Way Simultaneous (HDLC)
[Top]
-U-
U U reference point (ISDN)
U-MIC UTP Medium Interface Connector (Token Ring MAU)
U/L Universal/Local (MAC)
UA Unbalanced Asynchronous (HDLC)
UA Unnumbered Acknowledgement (HDLC)
UA User Agent
UAN User Access Node
UART Universal Asynchronous Receiver Transmitter
UBR Unspecified Bit Rate (ATM)
UCA Utility Communications Architecture
UCS Universal Communications Standards
UDI Unrestricted Digital Information (ISDN)
UDP User Datagram Protocol (IETF)
UHF Ultra High Frequency
UI Unnumbered Information (HDLC)
UISG Utility Industry Standards Group
ULTRIX DEC's version of UNIX
UMB Upper Memory Block
UN Unbalanced Normal
UNI User-Network Interface (ATM, FR)
UNMA Unified Network Management Architecture
UP Unumbered Poll
UPT Universal Personal Telecommunications
URL Uniform Resource Locator
USAA United Services Automobile Association
USART Universal Synchronous Asynchronous Receiver Transmitter
USAT Ultra Small Aperture Terminal
UTAM Unlicensed PCS Ad Hoc Committee for 2-GHz Microwave
UTC Coordinated Universal Time
UTP Unshielded Twisted Pair (Physical Layer)
UUCP UNIX-UNIX Copy
[Top]
-V-
VAN Value-Added Network
VAP Value-Added Process
VAX Virtual Address Extension (DEC)
VAXen Two or more VAXes
VBNS Very High-speed Backbone Network Service
VBR Variable Bit Rate (ATM)
VBR-NRT Variable Bit Rate-Non-Real-Time (ATM)
VBR-RT Variable Bit Rate-Real-Time (ATM)
VC Virtual Channel (ATM)
VC Virtual Circuit (PSN)
VC Virtual Container (SDH)
VCC Virtual Channel Connection (ATM)
VCI Virtual Channel Identifier (ATM)
VCI Virtual Circuit Identifier (ATM)
VCR Video Cassette Recorder
VCS Virtual Circuit Switch
VESP Video Enhanced Service Providers
VF Voice Frequency
VGA Video Graphics Array
VHDSL Very High bit rate Digital Subscriber Line
VHF Very High Frequency
VI Vector Identifier
VICS Voluntary Interindustry Communications Standards for EDI
VINES Virtual Networking System (Banyan)
VIP VINES Internet Protocol
VL Vector Length
VLBR Very Low Bit Rate
VLF Very Low Frequency
VLSI Very Large Scale Integration
VM Virtual Machine
VM Virtual Memory
VME Versa Module Europe
VMS Virtual Memory System (DEC)
VOD Video on Demand
VP Virtual Path
VPC Virtual Path Connection
VPI Virtual Path Identifier
VPN Virtual Private Network
VRC Vertical Redundancy Check
VSAM Virtual Storage Access Method
VSAT Very Small Aperture Terminal
VSB Vestigial Sideband
VSELP Vector Sum Excited Linear Prediction
VT Virtual Terminal (ISO)
VT Virtual Tributary
VTAM Virtual Telecommunications Access Method (SNA)
VTE Virtual Terminal Environment
VTP Virtual Terminal Protocol (ISO)
[Top]
-W-
WACK Wait Acknowledgement (BISYNC)
WACS Wireless Access Communications System
WAIS Wide Area Information Server (IETF)
WAN Wide Area Network
WARC World Administrative Radio Conference
WATS Wide Area Telecommunications Service
WB/BB Wideband/Broadband
WDM Wavelength-Division Multiplexing
WFW Windows For Workgroups (Microsoft)
WGS Workgroup Systems
WII Worldwide Information Infrastructure
WIMP Windows, Icons, Mouse, and Pull-down menus (Xerox)
WIN Wireless In-building Network
WINForum Wireless In-building Network Forum
WINS Warehouse Industry National Standards Guidelines
WWW World-Wide Web (IETF)
WYSIWYG What You See Is What You Get
[Top]
-X-
XA Exchange Access (SMDS)
XAPIA X.400 API Association
XDF Extended Distance Feature
XID Exchange Identification (HDLC)
XMP X/Open Management Protocol
XMS Extended Memory Specification
XNS Xerox Network Systems
XPG X/Open Portability Guide
XTP Express Transfer Protocol
[Top]
-Z-
ZBTSI Zero Byte Time Slot Interchange
ZCS Zero Code Suppression
ZIP Zone Information Protocol (AppleTalk)
ZIS Zone Information Socket
ZIT Zone Information Table
[Top]
© Copyright 1996, Motorola, Inc. All rights reserved.
Last modified: Tue, Jul 9, 1996 at 6:08 PM EDT