Holiday Update:
Fiber Optic Center will be closed December 24 and 25.
Due to potential early carrier pickups, PLEASE HAVE ALL ORDERS IN BY NOON ON MONDAY, DECEMBER 23.
We will resume our regular business hours on Thursday, December 26.
Fiber Optic Industry Acronyms - Fiber Optic Center
FIBER OPTIC CENTER Acronyms
#4ESS
4 Electronic Switching System (Class 4 switch)
#5ESS
5 Electronic Switching System (Class 5 switch)
0 or 0-
Zero Minus Dialing
0+
Zero Plus Dialing
0++
Zero Plus Plus Dialing
00+ or 00-
Double Zero Dialing
1+
One Plus Dialing
100BASE-T
Official project name for 100 Mb/s Fast Ethernet
100BASE-T4
100 Mb/s Fast Ethernet using 4-pair Category 3 cable
100BASE-TX
100 Mb/s Fast Ethernet using 2-pair Category 5 cable
100BT
100Base-T Ethernet
100VG-ANY LAN
100 Mb/s LAN using Demand Priority Protocol originally developed by Hewlett Packard and AT&T for Category 3 cable
10BASE-FL
An implementation of the Institute of Electrical and Electronic Engineers (IEEE) Ethernet standard on 62 5/125-µm fiber optic cable, a baseband medium of 10 Mbps
10BASE-T
An implementation of the Institute of Electrical and Electronic Engineers (IEEE) Ethernet standard on 24-AWG, unshielded, twisted-pair wiring, a baseband medium of 10 Mbps
10BASE2
An implementation of the Institute of Electrical and Electronic Engineers (IEEE) Ethernet standard on thin coaxial cable, a baseband medium of 10 Mbps The maximum segment length is just under 200m (656ft)
10BASE5
An implementation of the Institute of Electrical and Electronic Engineers (IEEE) Ethernet standard on twin axial cable, a baseband medium of 10 Mbps The maximum segment length is 500m (1,640ft)
10GbE
10 Gigabit Ethernet
1G
1st Generation wireless
2.5G
2 5 Generation wireless
2.75G
2 75 Generation wireless; humorous nickname for EDGE
23B + D
23 Bearer + 1 Delta Channels
281Q
Two Binary, One Quaternary
2B + D
2 Bearer + 1 Delta Channels
2G
2nd Generation Wireless
2W
Two-Wire Circuit
3G
3rd Generation wireless
3G.IP
Third Generation Internet Protocol Forum
3GPP
Third-Generation Partnership Project
3GPP2
Third Generation Partnership Project 2
4ESS
4 Electronic Switching System (Class 4 switch)
4G
4th Generation wireless
4W
Four-Wire Circuit
5ESS
5 Electronic Switching System (Class 5 switch)
802.11
Defined by the Institute of Electrical and Electronics Engineers (IEEE), these standards govern the use of wireless LANs
802.3
Defined by the Institute of Electrical and Electronic Engineers (IEEE), these standards govern the use of the Carrier Sense Multiple Access/Collision Detection (CSMA/CD) network access method used by Ethernet networks
802.5
Defined by the Institute of Electrical and Electronics Engineers (IEEE), these standards govern the use of the token ring network access method
822
Abreviation of Internet document RFC 822 (defining e-mail)
A
See Ampere (A)
A-Key / AKey
Authentication Key
A/D
Analog-to-digital
ABF
Air blown fiber
AC
Alternating Current
ACK
Abbreviation for the Acknowledge response in data communications
ACM
Aluminum conductor material
ACR
Attenuation to Crosstalk Ratio ACR is a comparison of signal strength to noise interference and is used as a bandwidth indicator
ADM
Add/drop multiplexer
ADSL
Asymmetric digital subscriber line
ADSS
All-dielectric self-supporting
AEIC
Association of Edison Illuminating Companies
AIA
Aluminum Interlocked Armor
AIM
Advanced Integration Module
AIN
Advanced Intelligent Network
AINAP
Advanced Intelligent Network Application Protocol
AIOD
Automatic Identification of Outward Dialing
AIS
1) Alarm Indication Signal; 2) Automated Information System
AIX
Advanced Interactive Executive
AIX 5L
See AIX
AL
Access Line
AL/MY
Acronym for Aluminum Mylar A laminated aluminum and polyester tape used for shielding wires
ALE
Automatic Link Establishment
ALU
Arithmetic Logic Unit
AM
Amplitude Modulation
AMC
Administrative Management Complex
AME
1) Automatic Message Exchange; 2) Amplitude Modulation Equivalent
AMI
Alternate Mark Inversion
AMIS
Audio Messaging Interchange Specification
AMPS
1) Advanced Mobile Phone Service; 2) Automatic Message Processing System
AMR
Advance multi Rate Codec
AMTA
America mobile Telecommunications Association
AMTS
Automated Maritime Telecommunications System
AN
Access Node
ANC
All Number Calling
ANI
Automatic Number Identification
ANSI
American National Standards Institution
AOC
Active optical cable
AON
All-optical network
AP
1) Access Point; 2) Anomalous Popagation
APC
1) Adaptive Predictive Coding; 2) Automatic Power Control
APD
Avalanche photodiode
API
Application Programming Interface
APIPA
Automatic Private IP Addressing
APL
Average Picture Level
APLT
Advanced Private Line Termination
APNIC
Asia Pacific Network Information Centre
APON
ATM Passive Optical Network
APPC
Advanced Program-to-Program Communication
APPI
Advanced Peer-to-Peer Internetworking
APPN
Advanced Peer-to-Peer Networking
APS
Automatic protection switching
APVD
Advanced plasma and vapor deposition
AR
Alternate Route
ARA
Apple Talk Remote Access
ARD
Automatic Ringdown
ARDIS
Advanced Radio Data Information System
ARFCN
Absolute Radio Frequency Channel Numbers
ARIB
Association of Radio Industries and Businesses
ARIN
American Registry for Internet Numbers
ARP
Address Resolution Protocol
ARPA
Advanced Research Projects Agency
ARPANET
Advanced Research Projects Agency Network
ARS
Automatic Route Selection
ART
Audible Ringing Tone
ARU
Audible Response Unit
AS
Analog Signal
ASA
The American Standards Association, former name of ANSI
ASCII
American Standard Code for Information Interchange
ASE
Amplified spontaneous emission
ASF
Active Streaming Format
ASIC
Application-Specific Intergraded Circuit
ASME
The American Society of Mechanical Engineers
ASOF
Application-specific optical fibers
ASP
Active Server Page; 2) Adjunct Service Point; 3) Application Service Provider
ASQ
American Society for Quality
ASR
Automated Speech Recognition
ASTM
American Society for Testing and Materials
AT
Attenuation
ATA
1) Advanced Technology Attachment; 2) Analog Telephone Adapter
ATAPI
Advanced Technology Attachment Packet Interface
ATB
All Trunks Busy
ATDM
Asynchronous Time-Division Mulitplexing
ATE
Automatic test equipment
ATIS
Alliance for Telecommunications Industry Solutions
ATM
Asynchronous Transfer Mode
ATSC
Advanced Television System Committee
ATTIS
AT&T Information Systems
ATU
ADSL Transceiver Unit
ATU-C
ADSL Transceiver Unit-Central Office
ATU-R
ADSL Transceiver Unit-Remote
ATV
Advanced Television
AU
Alternate Use
AUC
Authentication Center
AUI
Attachment Unit Interface
AVD
Alternate Voice Data
AVD Circuits
Alternate voice/data circuits
AVL
Automatic Vehicle Location
AVVID
Architecture for Voice, Video and Integrated Data
AWC
Abbreviation for American Wire Gauge A standard measurement of the size of a conductor
AWG
America Wire Gauge
AWGN
Additive White Gaussian Noise
AWM
Designation for Appliance Wiring Material
AX25
Amateur Radio X 25
AXE
An open architecture, Ericsson communications platform
B+S
Brown and Sharpe wire gauge, same as AWG
B-ISDN
Broadband ISDN
B-PON
Broadband passive optical network
B.C.
Bare Copper
B2B
Business-to-Business
B2C
Business-to-Business (e-Commerce)
B3ZS
Binary/Bipolar with 3 Zero Substitution
B6ZS
Binary/Bipolar with 6 Zero Substitution
B8ZS
Binary/Bipolar with 8 Zero Substitution
BACP
Bandwidth Allocation Control Protocol
BASR
Billing Automatic Send/Receive
BBC
Broadband Bearer Capability
BBN
Bolt, Beranek and Newmam
BCC
Block Check Characters
BCCH
Broadcast Control Channel
BCD
1) Binary Coded Decimal; 2) Broadcast Content Delivery
BCF
Billion Conductor Feet
BCH
Broadcast Channels
BCH Code
Bose-Chaudhuri-Hocquenghem Code
BCOB
Broadband Connection Oriented Bearer
BCOB-A
Bearer Class A
BCOB-X
Bearer Class X
BCP
Basic Call Process
BCSM
Basic Call State Model
BDCS
Broadband Digital Cross-Connect System
BDSL
Broadband DSL
BEC
Backward Error Correction
BECN
Backward Explicit Congestion Notification
BELR
Binary Equivalent Line Rate
BER
Bit Error Rate
BERT
Bit Error Rate Test/Tester
BETRA
Basic Exchange Telecommuncation Radio Service
BEX
Broadband Exchange
BI-MMF
Bend-insensitive multimode fiber
BIB
Backward Indicator Bit
BICC
Bearer Independent Call Control
BICI
Broadband Inter-Carrier Interface
BICSI
Building Industries Consulting Services International
BIF
Bend-insensitive fiber
BINHEX
Binary Hexadecimal
BIOS
Basic Input/Output System
BIP
Bit Interleaved Parity
BISDN
Broadband Integrated Service Digital Network
Bisync
Binary Synchronous Communications
BITS
Building Intergrated Timing Supply
BIU
Bus Interdace Unit
BLEC
Building Local Exchange Carrier
BLER
Block Error Rate
BLERT
Block Error Rate Test/Tester
BLES
Broadband Loop Emulation Services
BNM
Broadband Network Module
BOC
Bell Operating Company
BootP
Bootstrap Protocol
BOP
Bit Oriendted Protocol
Bot
Short for “robot”
BP
1 Breakeven Point; 2) Bypass
BPDU
Bridge Protocol Data Unit
BPF
Billion paired feet
BPI
Baseline Privacy Interface
Bps
1) Bits Per Second; 2) Bytes Per Second
BPSK
Binary Phase Shift Keying
BPV
Bipolar Violation
BRA
Basic Rate Access
BREW
Binary Runtime Environment for Wireless
BRF
Bridge Relay Function
BRI
Basic Rate Interface
BROUTER
A combination bridge and router, performing the functions of both in a single device
BS
Base Station
BSA
Basic Serving Arrangement
BSC
1) Base Station Controller; 2) Binary Synchronous Communications
BSE
Basic Service Element
BSIC
Base Station Identity Code
BSN
Backward Sequence Number
BSS
Base Station System
BT
1) Bandwidth Time Product; 2) Burst Tolerance
BTA
Basic Trading Area
BTAM
Basic Telecommunication Access Method
BTS
Base Transceiver Station
BTU
British Thermal Unit The quantity of heat required to raise the temperature of 1 lb of water 1°F
BUS
Broadcast and Unknown Server
BW
Bandwidth
BWA
Broadband Wireless Access
Byte
1) Bit Asynchronous Transmission Entity; 2) Typically a group of eight binary digits
C
1) A structured, procedural programming language; 2) Celsius - A temperature rating system where water freezes at zero degrees and boils at one hundred degrees
C Format
A video recording format commonly used in commercial recording
C Symbol
Designated for: capacitance, bias supply and centigrade
C-band / Cband
The C-band is the “conventional” DWDM transmission band, occupying the 1530 to 1565 nm wavelength range, as specified by the ITU-T G 692 Most EDFAs operate in the C-band
C-SJ
Same as SJ except extra-flexible conductor
C-SJO
Same as SJO except extra-flexible conductor
C.S.A. / CSA
Canadian Standards Association, a non-profit, independent organization which operates a listing service for electrical and electronic materials and equipment
C.V. / CV
Abbreviation for continuous vulcanization
C/I
Carrier-to-Interface Ratio
C/N
Carrier-to-Noise Ration
CA
Conditional Access/Authority
CAC
Carrier Access Code
CAD/CAM
Computer-Aided Design/Computer-Aided manufacturing See Radiomobile division for more information on AVL
CAI
Common Air Interface
CALC
Customer Access Line Charge
CALEA
Communications Assistance for Law Enforcement Act
CAN
Campus Area Network
CAP
1) Carrierless Amplitude and Phase Modulation; 2) Competitive Access Provider
CAPI
Common ISDN API
CARS
Cable Television Relay Service
CAS
Channel-Association Relay Service
CATV
Community Antenna Television
CAU
Controller Access Unit
CAV
Component Analog Video, a three circuit video format where the signal is transmitted in their component form, Luminance (Y) and Color Difference (R-Y and B-Y)
CBCH
Cell Broadcast Channel
CBO
Rubber insulated Brewery Cord
CBR
1) Committed Bit Rate; 2) Constant Bit Rate
CBT
Core-Based Trees
CC
1) Common Carrier; 2) Cost Component; 3) Cross Connection
CCCH
Common Control Channel
CCDF
Complementary Cumulative Distribution Function
CCH
Control Channel
CCIS
Common Channel Interoffice Signaling
CCITT
International Telephone and Telegraph Consultative Committee An international standards setting body for the telecommunications industry In 1985, the CCITT chartered the TIA/EIA with drafting the 568 Standards we use today
CCLC
Carrier Common Line Charge
CCS
1) Centi Common Line Charge; 2) Common Channel Signaling
CCSA
Common Control Switching Arrangement
CCTV
Closed Circuit Television
CD
Chromatic dispersion
CD-ROM / CDROM
Compact Disc, Read-Only-Memory
CDDI
Copper Distribution Data Interface
CDF
1) Channel Definition Format; 2) Cumulative Distribution Function
CDG
CDMA Development Group
CDM
Code Division Multiplex
CDMA
Code Division Multiple Access
Cdma2000 1xEV
The EV means “Evolution”
Cdma20001xEV-DO
The 1xEv-DoO means “1x-Evoltion-Data Optimized” (or Evolution- Data Only)
Cdma20001xEV-DV
The EV-DV means “1xEvolution-Data and Voice ”
Cdma20001xRTT
The RTT means single carrier Radio Transmission Technology
CDMA3Xrtt
Code Division Multiple Access 3-Carrier Radio Transmission Technology
cdmaOne®
Code Division Multiple Access One
CDP
Code Domain Power
CDPD
Cellular Domain Power
CDR
Call Detail Record
CDV
Cell Delay Variation
CDVCC
Coded Digital Verification Color Code
CDVT
Cell Delay Variation Tolerance
CE
Conditioning Equipment
CE Code, CEC
Canadian Electrical Code
CEBEC
Belgium Approval Agency; Comite Electrotechnique Belge Service de la Marque
CEC
Canadian Electrical Code
CEE
European Standards Agency; International Commission on Rules for the Approval of Electrical Equipment
CELP
Code-Book Excited Linear Predictive
CEN
Comite Europeen De Normalisation
CEN/ISSS
European Committee for Standardization/ Information Society Standardization System
CES
Circuit Emulation Service
CES Internetworking Function
See CES-IWF
CES-IWF
CES Internetworking Function
CEV
Controlled Environmental Vault
CFA
1) Carrier Facility Assignment; 2) Carrier Failure Alarm
CFIN
Carrier Frequency Identification Number
CFP
C form factor pluggable
CFR
Code of Federal Regulations (US)
CFTC
Copper From The Curb
CGA
Carrier Group Alarm
CGI
Common Gateway Interface
CGMP
Cisco Group Multicast Protocol
CGSA
Cellular Geographic Services Area
CHAP
Challenge Handshake Authentication Protocol
CHTML
Compact HTML
CI
Customer Installation
CIC
Carrier Identification Code
CICS
Customer Identification Code
CID
Customer Information Control System
CIDR
Channel Identifier
CIF
Common Intermediate Format
CIR
Committed Information Rate
CLASS
Custom Local Area Signaling Services
CLDC
Connected Limited Device Configuration
CLE
Customer Located Equipment
CLEC
Competitive Local Exchange Carrier
CLEI
Common Language Equipment Identifier
CLI
Command Line Interface
CLI, CLID
Calling Line Identification
CLLI
Common Location Language Identifier
CLP
Cell Loss Priority
CMA
Construction and Maintenance Agreement
CMIP
Common Management Information Protocol One of many network management information exchange protocols The current favorite is SNMP
CMR
Cellular Mobile Radio
CMRS
Commercial Mobile Radio Service
CMS
Call Management Service
CMTS
Cable Modem Termination System
CNG
Comfort Noise Generation
CNI
Communication Network Intelligence
CNI, CNID
Calling Number Identification
CNR
Carrier-to-noise ratio
CO
Central Office
COAM
Customer Owned And Maintained
COAX
Coaxial Cable
COCOT
Customer Owned Coin Operated Telephone
CODE
1) A set of unambiguous symbols and rules specifying the way in which data may be represented 2) In data communications, a system of rules and conventions according to which the signals representing data can be formed, transmitted, received and processed
CODEC
Compressor/Decompressor
COM
Component Object Model
COP
Character Oriented Protocol
CORBA
Common Object Request Broker Architecture
CORD
Center for Occupational Research and Development
COS
Class of Service
COT
Central Office Terminal
COW
Cell Site On Wheels
CP
Call-Progress Tones
CP-IWF
Customer Premises Interworking Function
CPAKTM
A 100-Gb/s C form factor pluggable optical transceiver from Cisco
CPD
Call Processing Data
CPE
1) Chlorinated Polyethylene; 2) Customer Premise Equipment
CPL
1) Commercial Private ; 2) Call Processing Language
CPM
Continuous Phase Modulation
CPN
Calling Party Number
CPNI
Calling Party Number Identification
CPS
Characters Per Second
CPSB
CompactPCI Packet Switching Backplane
CPU
Central Processing Unit
CR
Custom Record
CRC
Cyclic Redundancy Check/Code
CREDFACS
Conduit, Raceway, Equipment Ducts, and Facilities
CRIS
Customer Record Information System
CRM
Customer Relationship Management
CRTP
Compressed Real-Time Transmission Protocol
CS
1) Calling Seconds; 2) Carrier System
CS-95
Phelps Dodge High Performance Conductors trade name for extra high strength copper alloy
CS-ACELP
Conjugate Structure Algebraic Code Excited Linear Prediction
CSA
1) Carrier Service Area; 2) Canadian Standards Association
CSD
Circuit-Switch Data
CSF
Cutoff shifted fiber
CSM
Central strength member
CSMA
Carrier Sense Multiple Access
CSMA/CA
See Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
CSMA/CD
Carrier Sense Multiple with Collision Detection
CSO
Composite second order
CSPDN
Circuit Switch Public Data Network
CSPE
Insulating and jacketing compound based on chlorosulfonated polyethylene Also known as Hypalon (DuPont registered trademark)
CSRZ
Carrier suppressed return-to-zero
CSRZ-DQPSK
Carrier suppressed return-to-zero differential quadrature phase shift keying, a technology that makes it possible to generate DWDM signals with bit rates of 100 Gb/s and beyond per channel and transmit them over long distances
CSTA
Computer Supported Telephony Application
CSU
Channel Service Unit
CSU/DSU
Channel Service Unit/ Data Service Unit
CSV
Circuit-Switch Voice
CT
1) Computer Telephony; 2) Cross Talk (also XT)
CT-1 / CT1
Cordless Telephone-First Generation, or any variety of North American, European, and Japanese analog cordless telephone
CT-2 / CT2
Cordless Telephone-Second Generation, a digital cordless telephone standard generally used in a residential cordless phone, a Telepoint application, or in a small office wireless-public-branch-exchange system CT-2 handsets can initiate, but cannot receive calls
CT2
Cordless Telephone 2 Also written CT-2
CTD
Cell Transfer Delay
CTI
Computer Telephone Intergration
CTIA
1) Cellular Telecommunications and Internet Association; 2) Cellular Telecommunications Industry Association
CTS
1) Clear To Send; 2) Cordless Telephone System
CTT
Click-to-Talk
CTTC
Copper To The Curb
CU
Control Unit
CUT
Coordinated Universal Time
CV
Continuous Vulcanization
CW
Center wavelength, or continuous wave
CWDM
Coarse wavelength division multiplexing
CXC
Coaxial Cable, CSA (Canadian Standards Association) Cable Designation
CXR
Carrier
D TYPE
A description for the 9, 15 and 25 pin connectors widely used for data communications and microcomputer peripherals It looks very loosely like a "D" when viewed vertically
D-1 Format/ D1 Format
A serial digital recording format
D-2 Format / D2 Format
A composite digital recording format
D-3 Format / D3 Format
A composite digital recording format
D-AMPS
Digital Advanced Mobile Phone System/Service
D.C. / DC
Direct Current
D/A
Digital-to-analog
DA
Distribution Area
DAC
1) Digital to Analog Converter; 2) Discretion Access Control
DACS
Digital Access and Cross-Connection System
DAL
Dedicated Access Line
DAMA
Demand Assigned Multiple Access
DASD
Directly Accessible Storage Device IBM’s term for local hard disk
DAT
Digital Audio Tape
DAVIC
Digital Audio Video Council
dB
Decibel
dB Loss
The loss of a signal in a conductor expressed in decibels
dB/km
1) See Decibel/kilometer (dB/km); 2) A logarithmic unit describing the ratio of loss of power per kilometer distance These values are always referenced to a specific wavelength, e g , 0 35 dB/km at 1310 nm, and are used by fiber and cable manufacturers to define the optical fiber’s attenuation
DB15
A standardized connector with 15 pins for Ethernet transceivers
DB25
A standardized connector with 25 pins for parallel or serial connections
DB9
A standardized connector with nine pins for token ring and serial connections
dBc
Decibel Carrier
dBd
Decibel Dipole
DBFA
Dual-band fiber amplifier
dBi
Decibel Isotropic
dBm
Decibel Milliwatt
DBMS
Data Base Management System
DBN
Data Base Node
DBS
Direct Broadcast Satellite
DC
Direct current
DCA
1) Dynamic Channel Allocation; 2) Defense Communications Agency (Now DISA)
DCB-MHB
Digital Video Broadcasting-Multimedia Home Platform
DCC
Data communication channel
DCCH
Dedicated Control Channel
DCE
1) Data Communications Equipment; 2) Distributed Computing Environment
DCF
Dispersion-compensating fiber
DCM
Dispersion compensation module
DCN
Data Communication Network
DCOM
Distributed Component Object Model
DCR
Direct current resistance
DCS
1) Defense Communications System; 2) Digital Cross-connection System
DCS 1800
Digital Cordless Standard 1800
DCT
1) Digital Consumer Terminal; 2) Discrete Cosine Transform; 3) Digital European Cordless Telephone/ Telecommunication/ Technology
DDCMP
Digital Data Communication Message Protocol
DDD
Direct Distance Dialing
DDL
1) Data Definition Language; 2) Data Description Language
DDN
Defense Data Network
DDS
1) Dataphone Digital Service; 2) Digital Data Service
DE
Discard Eligible
DEK
Data Encryption Key
DEMUX
Demultiplex
DES
Data Encryption Standard
DF
Distribution Frame
DFARS
Department of Defense Federal Acquisition Regulation Supplement Governs purchases made by the Department of Defense Includes regulations for the purchase of materials made from Specialty Metals (including stainless steel) Often referred to as the “Berry Amendment”
DFB
Distributed feedback (laser)
DFE
Decision Feedback Equalizer
DFSK
Double-frequency shift keying
DFT
Discrete Fourier Transform
DGD
Differential group delay
DGE
Dynamic gain equalizer
DHCP
Dynamic Host Configuration Protocol
DHTML
Dynamic Hypertext Makeup Language
DIACID
A molecule with two carboxylic acid (-COOH) functional groups
Diameter
Distance measured across the center of a circle circumscribing the wires of a strand or the strands of a wire rope
DIAMINE
A molecule with two amine (-NH2) functional group
DIB
Dual-insulated buffer
DID
Direct Inward Dialing
DINS
Dialed Number Identification Service
DIOL
A molecule with two alcohol (-OH) functional groups; also called "dialcohol"
DIP
Dual in-line package
DISA
1) Defense Information Systems Agency; 2) Direct Inward System Access
DISC
Disconnect Command
DISOSS
Distributed Office Support System by IBM
DIW
See Network Communications Cable (NCC) and Twisted Pair
DL
1) Dial Level; 2) Downlink
DLC
1) Data Link Control; 2) Digital Loop Carrier
DLCI
Data Ling Connection Identifier
DLE
Data Link Escaper character
DLL
Dynamic Link Library
DLSw
Data Ling Switching
DM
Delta Modulation
DMA
Direct Memory Access
DMD
Differential mode delay
DMI
Digital Multiplexed Interface
DML
Directly-modulated laser
DMOPRP
Switch Profile Loading procedure for a Nortel DMS-250 programmable switch, which accomplishes Network Database Updates
DMT
1) Digital Media Platform; 2) Discrete MuiltTone
DMZ
Demilitarization Zone
DN
Directory Number
DNA
Digital Network Architecture
DNC
Distributed Network Computing
DNIC
Data Network Identification Code
DNPA
Data Numbering Plan Area
DNS
Domain Name System/ Service/ Server
DOCSIS
Data Over Cable Service Interface Specification
DOD
Direct Outward Dialing
DOM
Document Object Model
DOP
Degree of polarization
DOPL
Differential optical path loss
DOS
Disk Operating System
DP
1) Dial Pulsing; 2) Dialing Plan
DP-QPSK
Dual polarization quadrature phase-shift keying
DPCM
Differential Pulse-Code Modulation
DPM
Digital Phase Modulation
DPNSS
Digital Private Network Signaling System Standard
DPSK
Differential Phase-Shift Keying
DPSS
Diode-pumped solid-state
DQDB
Distributed Queue Dual Bus
DQPSK
Differential Quadrature Phase-Shift Keying
DRT
Plastic range and dryer cord (CSA)
DS
1) Data Set; 2) Direct Sequence; 3) Directory Server; 4) Digital Signal/System/Service
DS-0
(also DSO) Digital Signal Level Zero
DS-1
(also DS1) Digital Signal Level 1
DS-1C
(also DS1C) Digital Signal Level 1C
DS-2
(also DS2) Digital Signal Level 2
DS-3
(also DS3) Digital Signal Level 3
DS-x
Digital Signal X
DSA
1) Dial Services Assistance; 2) Distributed System Architecture
DSB
Double-Sideband transmission
DSB-RC
Double-Sideband Reduced Carrier
DSB-SC
Double-Sideband Suppressed-Carrier
DSF
Dispersion-shifted fiber
DSL
Digital Subscriber Line
DSLAM
Digital Subscriber Line Access Multiplixer
DSN
1) Defense Switched Network; 2) Distributed System Network
DSP
Digital Signal Processing/Processor
DSR
Digital Signal Rate
DSS
1) Decision Support Signal; 2) Dial Selective Signaling; 3) Digital Satellite Service; 4) Digital Signature Standard
DSSS
Direct Sequence Spread Spectrum
DSU
Digital Service Unit
DSX 1 / DSX 3
A DS-1 / DS-3 Cross Connect
DSX-1
DS-1 Cross Connect
DT
1) Data Terminal; 2) Dial Tone
DTAP
Direct Transfer Application Part
DTE
Data Terminal Equipment
DTMF
Dial Tone Multi-Frequency
DTV
Digital Television
DTX
Discontinuous Transmission
DUA
Direct User Agent
DUT
Device under test.
DVB
Digital Video Broadcasting
DVB Project
Digital Video Broadcasting Project
DVD
Digital Versatile Disk
DWDM
Dense Wave Division Multiplexing
DWLL
Fixed-Wireless Local Loop
DWMT
Discrete Wavelet Multi-Tone
DWT
Discrete Wavelet Transform
DXI
Data Exchange Interface
E
Voltage, electromotive force
E-band
Defined by ITU-T G 692 as “extended” for wavelengths between 1360 and 1460 nm This band includes the high OH peak in single-mode fibers G 652D fiber is designed for transmission within the extended band In FTTx systems, the term can be confused with the enhancement band, which the ITU-T G 983 and G 984 PON FTTx standards define as the wavelengths between 1550 and 1560 nm for RF overlay transmission of video signals
E-Block Carrier
A 10-MHz personal-communications-services carrier serving a basic trading area in the 1885-to-1890-MHz frequency range paired with 1965-to-1970-MHz
E-business
Electronic Business
E-ISUP
Extended-ISUP
E-mail / Email
Electronic Mail
E-Netz
German name for GMS 1800 network
E-TDMA / ETDMA
Extended/Enhanced Time Division Multiple Access
E1
Europa 1 Euproean equivalent to T1 (but higher bandwidth) Also written as E-1
E3
Europa 3 Euproean equivalent to T3 (but higher bandwidth) Also written as E-3
E911
Enhanced 911
E911 POTS
Enhanced 911 Plain Old Telephone Service
EA
Economic Area
EAL
Evolution Assurance Level
EAP
Extensible Authentication Protocol
EAS
Extended Area Service
EB
Exabyte
Eb/N0
Bit Energy-to-Noise Density
EBCDIC
Extended Binary Code Decimal Interchange Code
EBONE
European Backbone
EBX
Embedded Board, eXpandable
EC
1) Coverage; 2) Echo Cancellation; 3) Electronic Commerce; 4) Exchange Character; 5) Electronically Controlled Coupling
ECDSA
Elliptic Curve Digital Signature Algorithm
ECH
Echo-Cancelled Hybrid
ECIA
Electronics Components Industry Association
ECMA
European Computer Manufacturers Association
ECSA
Exchange Carrier Standards Association
ECTF
Enterprise Computer Telephony Forum
ECTFE
Ethylene chloro-triflouroethylene (Halar®)
EDA
Equipment distribution area
EDFA
Erbium-doped fiber amplifier
EDGE
Enhances Data rates for GMS Evolution
EDI
Electronic Data/Documents Interchange
EDOA
Erbium-Doped Optical Amplifier
EDTV
Extended Definition Television
edu
“Education;” one of the top-level Internet domain names
EEE
Electronic Equipment Enclosure
EEHO
Either End Hop Off
EEMAC
Electrical and Electronic Manufacturers Association of Canada (U S counterpart is NEMA)
EEPROM
Electrically Erasable Programmable Read-Only Memory
EF
Encircled flux
EFCI
Explicit Forward Congestion Indication
EFM
Ethernet in the first mile
EFR
Enhanced Full Rate
EFS
Error-Free Seconds
EFT
Electronic Funds Transfer
EFTS
Abbreviation for Electronic Funds Transfer System
EGP
Exterior Gateway Protocol
EHF
Extremely High Frequency
EIA
Electronic Industry Association
EIA/TIA
North American Standards organization
EIA/TIA 568B
North American commercial building telecommunications wiring standard
EIA/TIA 569A
North American commercial building standard for telecommunications pathways and spaces Its purpose is to standardize specific design and construction practices within and between buildings which are in support of telecommunications media and equipment
EIA/TIA 606
North American administration standard for the telecommunications infrastructure of commercial buildings Its purpose is to provide guidelines for a uniform administration scheme for the cabling infrastructure
EIR
Equipment Identity Register
EIRP
Effective Isotropic Radiated Power
EISA
Extended Industry Standard Architecture An independent alternative to IBM’s Micro-channel for 32 bit computers
EKMS
Electronic Key Management System
EKTS
Electronic Key Telephone Service
ELEC
See EtherLEC
ELED
Edge-emitting diode
ELF
Extremely Low Frequency
ELINT
Electronics Intelligence
ELSEC
Electronics Security
EMB
Effective modal bandwidth
EMC
Electromagnetic Compatibility
EMD
Equilibrium modal distribution
EME
Electromagnetic Environment
EMF
Electromotive force (voltage)
EMI
Electromagnetic Interference
EMP
Electromagnetic Pulse
EMR
Electromagnetic Radiation
EMRC
Energy Mines and Resources Canada
EMRP
Effective Monopole Radiated Power
EMS
1) Element Management System; 2) Electronic Message System
EMSED
Emanations Security
EMTOX
Exchanged of Mixed Traffic over X 25
EMV
Electromagnetic Vulnerability
EN 50173
The European standard for generic cabling for customer premises
EN 50174
A proposed European cabling systems planning and installation standard developed by CENELEC
ENG
Electronic News Gathering
ENQ
Enquiry
ENUM
Electromagnetic Numbering
EO
Electrical–optical
EOC
Embedded Operations Channel
EOM
End-Of-Message
EOT
End-Of-Transmission character
EPA
Environmental Protection Agency (US)
EPD
1) Early Packet Discard; 2) Early Path Delay
EPDM
Ethylene-propylene-dene monomer rubber
EPON
Ethernet PON
EPR
Ethylene-propylene copolymer rubber
EPROM
Erasable Programmable Read Only Memory
EPSCS
Enhanced Private Switched Comms Service
ERK
Emergency restoration kit
ERL
Echo Return Loss
ERM
1) Enterprise Relationship Management; 2) Enterprise Resource Message System
ERMES
European Radio Message System
ERP
1) Effective Radiated Power; 2) Enterprise Resource Planning
ES
1) Errored Second; 2) Expert System
ESC
Escape character
ESCON
Enterprise System Connection
ESD
Electrostatic Discharge
ESDI
Enhanced Small Device Interface
ESF
Extended Super Frame
ESL
Estimated splice loss
ESMR
Enhanced Specialized Mobile Radio
ESN
Electronic Serial Number
ESS
1) Electronic Switching System; 2) Employee Self-Service
ESTA
Australian approval agency, Electricity Trust of South Australia
ETACS
Extended Total Access Communications System
ETB
End-of-Transmission Block character
ETFE
Ethylene tetrafluoroethylene
EtherLEC
Ethernet Local Exchange Carrier
ETIS
E- and Telecommunications Informatics Services
ETN
Electronic Tandem Network
ETP
The European Telecommunications Platform
ETPC
Electrolytic Tough Pitch Copper
ETSI
European Telecommunications Standards Institute
ETX
End-of-Text characters
EVC
Equivalent voice channels
EVM
Error Vector Magnitude
EXZ
Excessive Zeroes
F
1) Frequency; 2) Fahrenheit
F.P.A. / FPA
General Cable's trademark for polyethylene fused to aluminum for use as cable shielding
FAA
Federal Aviation Administration
FACCH
Fast Associated Control Channel
FACH
Forward Access Channel
FAQ
Frequently-Asked-Questions
FAT
1) File Allocation Table; 2) Fiber access terminal
FAW
Frame Alignment Word
Fax
Facsimile
FBC
Facilities-Based Carrier
FBG
Fiber Bragg grating
FBT
Fused biconical taper
FC
Fibre Channel
FCC
Federal Communications Commission
FCCH
Frequently Correction Channel
FCIA
Fibre Channel Industry Association
FCIP
Fibre Channel over IP
FCS
Frame Check Sequence
FD
Full Duplex
FDB
Fiber demarcation box
FDD
Frequency-Division Duplex
FDDI
Fiber Distributed Data Interface
FDF
Fiber distribution frame
FDH
Fiber Distribution Hub
FDI
Fiber Distribution Interface
FDM
Frequency-Division Mulitplexing
FDMA
Frequency-Division Multiple Access
FDU
Fiber istribution unit
FEBE
Far End Block Error
FEC
Forward Error Control/Correction
FEP
1) Front End Processor; 2) Fluorinated Ethylene Propylene
FER
Frame Erasure/Error Rate
FET
Field effect transistor
FEU
Fourty-foot Equivalent Unit (same as two TEU)
FEXT
Far End CrossTalk
FFT
Fast Fourier Transform
FG
Feature Group
FGA
Feature Group A (followed by B, C and D
FH
Frequency Hopping
FHMA
Frequency-Hopping Multiple Access
FHPE
Foamed high density polyethylene
FHSS
Frequency-Hopping Spread Spectrum
FI
Approval agency of Finland; Electrical Inspectorate
FIFM
Fiber in the first mile
FIFO
First-In, First-Out
FILM
Fiber in the last mile
FIPS
Federal Information Processing Standard
FIR
Finite Impulse Response
FITL
Fiber In The Loop
FLOPS
Floating-Point Operations per Second
FM
Frequency Modulation
FNC
Federal Networking Council (formerly FRICC)
FO
Common abbreviation for "fiber optic "
FO-2, FO-6
See TIA/IEEE STANDARDS COMMITTEES
FOCIS
Fiber Optic Connector Intermateability Standard
FOCS
Fiber Optic Communication System
FOIRL
Fiber Optic Inter-Repeater Link
FOMA
Freedom of Mobile multimedia Access
FOT
Fiber Optic Terminal
FOTP
Fiber Optic Test Procedures
FOTR
Fiber Optic Transceiver
FOTS
Fiber Optic Transmission Systems
FP
Fabry-Perot (laser)
FPL
Designation of cable which meets Vertical Tray flame test for Fire Protection Signaling Systems
FPLMTS
Future Public Land Mobile Telecommunications System
FPLP
Designation of Plenum Cable which meets Steiner Tunnel Test for Fire Protection Signaling Systems
FPLR
Designation of Riser Cable which meets Riser flame test for Fire Protection Signaling Systems
FPS
Frames Per Second
FR
1) Frame Relay; 2) Frequency Response
FR-1 / FR1
A flammability rating established by Underwriters' Laboratories for wires and cables that pass a specially designed vertical flame test This designation has been replaced by VW-1
FRA
Fixed-Radio Access
FRAD
Frame Relay Access Devise
FRD
Fire Retardant
FRF
1) Frame Relay Forum; 2) Free Software Foundation
FRNC
Flame Retardant Non Corrosive
FRP
Fiberglass Rodent Protection
FRSP
Frame Relay Service Provider
FSAN
Full Service Access Network
FSK
Frequency Shift Keying
FSM
Finite State Machine
FSO
1) Foreign Serving Office; 2) Free-Space Optical
FSWDM
Full spectrum wavelength division multiplexing
FT
1) Fault Tolerance; 2) Fourier Transform
FTP
File Transfer Protocol
FTSA
Fiber to Service Area
FTTA
Fiber to the Antenna
FTTB
Fiber to the Building or Business
FTTC
Fiber To The Curb/Cabinet
FTTD
Fiber to the Desk
FTTH
Fiber To The Home
FTTN
Fiber to the Node
FTTO
Fiber to the Office
FTTx
Fiber to the Premises
FUNI
Frame-based ATM User Network Interface
FWD
Free World Dialup
FWHM
Full width, half maximum
FWM
Four wave mixing
FX
Foreign Exchange
FXO
Foreign Exchange Office
FXS
Foreign Exchange Service, Foreign Exchange Station
G round Potential
Zero potential with respect to the ground or earth
G-PON / GPON
Gigabit PON
G.7xx-
A family of ITU standards for audio compression
G.dmt / Gdmt
ADSL using Discrete Multitone Modulation
G.Lite / G Lite
Universal ADSL (UADSL), DSL Lite or ADSL Lite
G.SHDSL / GSHDSL
Single paid High-bit-rate Digital Subscriber Line
G/T
Antenna Gain-to-Noise-Temperature
GAN
Global Area Network
Gb
1) Gigabit; 2) Gigabyte
GbE
Gigabit Ethernet
GBH
Group Busy Hour
GBIC
Gigabit interface converter
Gbps
1) Gigabits per second; 2) Gigabytes per second
GBR
The same signals as RGB
GBRS
The color signal set that includes Sync
GCAC
Generic Connection Admission Control
GCRA
Generic Cell Rate Algorithm
GCT
Greenwich Civil Time
GD
Group delay
GDF
Group Distribution Frame
GDP
Gateway Discovery Protocol
GEM
G-PON encapsulation method
GEO
Geostationary/Geosynchronous Earth Orbit
GERAN
GSM Edge Radio Access Network
GETS
Government Emergency Telecommunications Service
GFF
Gain flattening filter
GFP
Global Functional Plane
GGP
Gateway-to-Gateway Protocol
GGSN
Gateway GPRS Support Node
GHOST
GSM Hosted SMS Teleservices
GHz
Gigahertz
GI-MMF / GIMMF
Graded-index multimode fiber
GI-POF / GIPOF
Graded-index plastic optical fiber
GIAC
Global Information Assurance Certification
Giga
One billion (US)
GII
Global Information Infrastructure
GIIF
Global Integrated Services Digital Network Industry Forum
GIX
Global Internet eXchange
GLULAM
Synonym for structural-glued-laminated timber
GMCF
Global Mobile Commerce
GMII
Gigabit MII
GMPCS
Global Mobile Personal Communications by Satellite
GMSK
Gaussuian Minimum Shift Keying
GMT
Greenwich Mean Time
GND
Ground
GNU
A recursive acronym for “GNU’s Not Unix,” a Unix-like operating system
GOF
Graphic Interchange Format
GOS
Grade of Service
Gosip
Government OIS Procurement
Gov
“Government;” one of the top-level Internet domain names
GPIB
General purpose interface bus Also known as the IEEE-488 bus One method of providing communication between various test equipment and controllers
GPRS
General Packet Radio Service
GPS
Global Positioning System
GR-303 / GR303
Generic Requirement 303
GRE
Generic Routing Encapsulation (Crisco invention)
GRIN
Gradient index
GRND
Ground abbreviated
GS
Grade of Service
GSM
Global System for Mobile Communication
GSMA
Global System for Mobile Association
GSTN
General Switched Telephone Network
GT
Global Title (SS7)
gTLD
Generic Top-Level Domain name
GTO
Gast tube sign and oil-burner ignition cable 5,000V-15,000V
GTS
Global Telecommunications Society
GTT
Global Title Translation
GUI
Graphical User Interface
H
Magnetic Intensity and Henry (a unit of inductance)
H2GT
HyperLAN2 Global Forum
HAAT
Height Above Average Terrain
HASB
High air-speed blown
HC
Horizontal cross-connect
HCDS
High Capacity Digital Service
HCI
Human-Computer Interaction
HCM
High-performance voice Compression Modules
HD
1) Half Duplex; 2) Half Distortion
HDA
Horizontal distribution area
HDB3
High Density Bipolar Three Zeros Substitution
HDD
Hard Disk Drive
HDLC
High-Level Data Ling Control
HDML
Handheld Device Markup Language
HDPE
High-density polyethylene
HDSL
High bit-rate Digital Subscriber Line
HDSL-2 / HDSL2
2nd generation HDSL
HDTP
Handheld Device Transport Protocol
HDTV
High Definition Television
HDX
Half-Duplex
HEC
Header Error Check
HEHO
Head End Hop Off
HEMP
High-Altitude Electromagnetic Pulse
HEO
Highly Elliptical Orbit
HERF
Hazards of Electromagnetic Radiation to Fuel
HERO
Hazards of Electromagnetic Radiation to Ordnance
HERP
Hazards of Electromagnetic Radiation to Personnel
HF
High Frequency
HFC
Hybrid Fibre Coax
HFDF
High-Frequency Distribution Frame
HFOC
Hardened fiber-optic connector
HIDS
Host-based Intrusion Detected System
HIPPI
High performance parallel interface
HIT
Induced Electrical Impulse
HLD
High-Level Designator
HLL
High Level Language
HLR
Home Location Registration
HMAC
Hash-based Message Authentication Code
HMFOC
Hardened multifiber optical connector
HMI
Human Machine Interface
HML
Multiline Hunt Group
HO-HO / HOHO
Hop-On Hop-Off
HOST
Term describing a Host computer A central computer responsible for the control of time-share terminals and other peripherals Usually associated with minicomputers and mainframes
HP
Horizontal Pitch
HPCC
High-Performance Computing and Communications
HPCS
High-Performance Computing System
HPD
Rubber and asbestos-insulated heater cord No braid on individual conductors but with braid overall Also made with neoprene insulation and no asbestos or PVC/NBC
HPLMN
Home Public Land Mobile Network
HPN
Two-conductor, neoprene-insulated heater cord Parallel construction For use in damp locations
HPR
High-Performance Routing
HPSK
Hybrid Phase Shift Key
HR/DSSS PHY
High Rate/Direct Sequence Spread Spectrum Physical Layer
HRFWG
Home Radio Frequency Working Group
HRU
HDSL Repeater Unit
HS
600V rated Rubber insulated Heater Cord
HSCI
High-Speed Communications Interface (Cisco)
HSCSD
High Speed Circuit Switched Data
HSJ
300V rated Rubber insulated Heater Cord
HSRP
Hot Standby Router Protocol
HSSI
High-Speed Serial Interface
HSTR
High-speed Token Ring
HTML
Hypertext Markup Language
HTTP
Hypertext Transfer Protocol
HTTPD
Hypertext Transfer Protocol Daemon
HTU-C / HTUC
HDLS Terminal Unit-Central Office
HTU-R / HTUR
HDSL Terminal Unit- Remote
HUB
1 A central point of connection for several circuits 2 A device which electrically converts a logical topology to a different physical topology An ARCNET hub enables physically star-wired nodes to be seen as a logical, token-passing bus Hubs can be active (powered), or passive (non-powered) Active hubs sometimes are capable of allowing longer cabling lengths than passive units
HVAD
Hybrid vapor axial deposition
Hz
Hertz
I
In-Phase
I/O
Input/Output
I/O CHANNEL
A high-speed bus used to interconnect peripherals with the CPU
I2R
Formula for power in watts, where I = current in amperes, R = resistance in ohms Also see Watt
IAB
Internet Architecture Board
IABS
Integrated Access Billing System
IACS
International Annealed Copper Standard
IAD
Integrated Access Device
IAEI
International Association of Electrical Inspectors
IANA
Internet Assigned Number Authority
IBM
International Business Machines Corporation
IC
Integrated Circuit
ICA
International Communications Association
ICANN
Internet Corporation for Assigned Names and Numbers
ICAP
Interactive Communicating Application
ICC
International Color Code Standard for wire jacket colors; Hot=Brown, Neutral=Blue, Ground=Green/Yellow
ICCF
Interexchange Carrier Compatibility Forum
ICD
Internet Corporation Device
ICEA
Abbreviation for Insulated Cable Engineers Association
ICEA S-95-658-1999
Standard for nonshielded power cables rated 2000 volts or less for the distribution of electrical energy covers THHN/THWN, XHHW and RHH/RHW/USE cables
ICMP
Internet Control Message Protocol
ICO
Intermediate Circular Orbit
ICO RTT
ICO
ICP
IMA Control Protocol
ICW
Internet Call Waiting
ID
Internal Diameter
IDC
Insulation Displacement Connection
iDEN®
Integrated Digital Enhanced Network
IDF
Intermediate Distribution Frame
IDFT
Inverse Discrete Fourier Transform
IDLC
Integrated Digital Network
IDN
Intergraded Digital Network
IDSL
Intergraded Services Digital Subscriber Line
IDT
Intergraded Digital Terminal
IEC
Interexchange Carrier
IEEE
Institute of Electronics Engineers
IEEE 802
IEEE committee to develop LAN standards
IEEE 802.11
Designation for the IEEE subcommittee which is developing the wireless local-area network standard This standard is being formulated to provide interoperability of wireless local-area-network products
IEEE 802.3
Ethernet standards
IEEE 802.X
Guidelines describing the physical and data link layers of the OSI network model for various topologies
IETF
Internet Engineering Task Force
IF
Intermediate Frequency
IFC
Intra Fiber Cabling
iFCP
Internet Fibre Channel Protocol
IFFT
Inverse Fast Fourier Transform
IGMP
Internet Group Management Protocol
IGP
Interior Gateway Protocol
IIS
Internet Information Server
IL
Insertion Loss.
IL/RL
Insertion Loss / Return Loss.
ILD
Injection laser diode
ILEC
Incumbent Local Exchange Carrier
ILMI
Integrated Local Management Interface
ILTA
Integrable tunable laser assemblies
IM
Instant Messaging
IMA
Inverse Multiplexing of ATM
IMAP
Internet Message Access Protocol
IMC
Internet Mail Consortium
IME
Interfacing Management Entity
IMEI
International Mobile Equipment Identifier
IMS
IP Multimedia Subsystem
IMSA
International Municipal Signal Association
IMSI
International Mobile Station Identity
IMT
Inter-Machine Trunk
IMT-CDMA Multicarrier / IMTCDMA
See cdma2000® 1XRTT
IMT-CDMA Multicarrier 3X / IMTCDMA
See MC-3X
IMT-DS / IMTDS
International Mobile Telecommunications Direct Spread
IMT-MC / IMTMC
International Mobile Telecommunications Multi-Carrier
IMT-SC / IMTSC
International Mobile Telecommunications Single Carrier
IMT-TC / IMTTC
International Mobile Telecommunications Time Code
IMTC
International Multimedia Telecommunications Consortium
IMTS
Improved Mobile Telephone Service
IMX
Intelligent Multiservice Switch
IN
Intelligent Network
INAP
Intelligent Network Application Protocol
InGaAsP
Indium gallium arsenide phosphide
INP
Interim Number Portability
INTUF
International Telecommunications Users Group
IO
Information Outlets
IOS
Internetworking Operating System
IOT
Inter-Office Trunk
IP
1) Interexchange Plant; 2) Internet Protocol
IP PBX
Internet Protocol Private Branch Exchange
IP Rating
Ingress Protection Rating, a two digit code, and an optional letter, specifying the level of protection from foreign objects with the first digit referring to protection from solids and the second digit referring to protection from liquids The optional letter can be appended to classify only the level of protection against access to hazardous parts by persons or to provide additional information related to the protection of the device
IP SAN
Internet Protocol Storage Area Network
IPA
Isopropyl alcohol
IPC IPCC
Interprocess Communication
IPCEA
Insulated Power and Cable Engineers Association
IPL
Initial Program Load
Ipsec
Internet Protocol Security
IPTV
Internet Protocol Television
IPX
Internet Packet Exchange
IPXCP
IPX Control Protocol
IR
Infrared
IRC
1) International Record Carrier; 2) Internet Relay Chart
IrDA
Infrared Data Association
IRQ
Interrupt ReQuest
IRTF
Internet Research Task Force
IS
Interim Standard
ISA
1) Industry Standard Architecture; 2) Instrument Society of America
ISAPI
Internet Server Application Program Interface
ISC
International Sorftswitch Consortium
ISDN
Integrated Services Digital Consortium
ISI
Inter-Symbol Interference
ISIS
Intermediate System-to-Intermediate System
ISMA
Internet Streaming Media Alliance
ISO
International Standards Organization
ISP
Internet Service Provider
ISS
Internet Security Scanner
ISV
Independent Software Vendor
IT
Information Technology
ITAC
International Telework Association and Council
ITC
Independent Telephone Company
ITG
IP Telephony Gateway
ITMC
International Test and Maintenance Centers
ITS
1) Information Transport System (for premises systems); 2) Intelligent Transportation System (for highway systems)
ITSP
Internet Telephony Service Provider
ITU
International Telecommunication Union
ITU-T / ITUT
International Telecommunication Union, Telecommunications Standardization Sector
IVD
Inside vapor deposition
IVM
Instant Voice Messaging
IVR
Interactive Voice Response
IWF
Interworking Function
IXC
Inter-Exchange Carrier
J/S
Jamming to Signal Ratio
J2ME
Java 2 Micro Edition
JAIN
Java APIs for Integrated Networks
JANET
Joint Academic Network
JCC
JAIN Call Control
JDBC
Java Database Connectivity
JMS
Java Message Service
JPEG
Joint Photographic Experts Group
JSC
Joint Spectrum Center
JSP
Java Server Center
JTACS
Japanese Total Access Communications System
JTAPI
Java Telephony Application Programming Interface
JTIDS
Joint Tactical Information Distribution System
JTRB
Joint Telecommunications Resources Board
K
1) Kelvin (temperature); 2) Kilobyte; 3) Metric "Kilo" or 1000; 4) Constant used to denote insulation resistance
K-Band / KBand
Radio spectrum in the 18GHz to 27GHz range used by satellite communications systems
KB
Kilobyte (1924 bytes)
Kbps
Kilobyte (1000s) per second
KCM
1000 circular mils
kcmil
One thousand circular mils (MCM)
KDC
Key Distribution Center
KEK
Key-Encrypting-Key
KeV
1000 electron volts
KHz
Kilohertz
km
Kilometer
KPSI
Tensile strength in thousands of pounds per square inch
KTS
Key Telephone System
kV
Kilovolt (1000 volts)
kVA
Kilovoltampere
KWH
Kilowatt hours (1000 watt hours)
L
Symbol for inductance
L1 and L2
Level 1 and Level 2 memory caches in a computer
L2F Protocol
Layer Two Forwarding Protocol
L2TP
Layer Two Tunneling Protocol
LAA
Longest Available Agent
LAC
L2TP access concentrator
LAI
Location Area Identity
LAN
Local Area Network
LANE
LAN Emulation
LANE UNI
LANE User-Network Interface
LAP
Local Access Provider
LAPB
Link Access Protocol/Procedure Balanced
LAPD
Link Access Protocol/Procedure on the D Channel
LAPM
Link Access Protocol/Procedure for Modems
LASER
Light Amplification by Stimulated Emission of Radiation
LAT
Local Area Transport
LATA
Local Access and Transport Area
LBS
Location-Based Services
LC-ATM / LCATM
Label-Controlled ATM interface
LCA
Local Calling Area
LCD
Liquid Crystal Display
LCI
Logical Channel Identifier
LCN
Logical Channel Number
LCP
Link Control Protocol
LCR
Least Cost Routing
LCV
Line Code Violation
LD
Long Distance
LDAP
Lightweight Directory Access Protocol
LDCELP
Low-delay CELP
LDIF
LDAP Data Interchange Format
LDP
Label Distribution Protocol
LDPE
Low Density Polyethylene
LDS
Local Digital Switch
LEAP
Lightweight Extensible Authentication Protocol
LEARP
LAN Emulation Address Resolution Protocol
LEC
Local Exchange Carrier
LEC BAN
Local Exchange Carrier Billing Account Number
LECS
LAN Emulation Configuration Server
LED
Light-Emitting Diode
LEO
Low Earth Orbit
LERG
Local Exchange Routing Guide
LES
LAN Emulation Server
LFIB
Label Forwarding Information Base
LFSR
Linear Feedback Shift Register
LGN
Logical Group Node
LIA
Laser Institute of America
LID
Local Injection and Detection
LIS
Logical IP Subnet
LL
Leased Line
LLC
Logical Link Control
LMDS
Local Multipoint Distributed Service
LMI
Local Management Interface
LNA
Low Noise Amplifier
LNP
Local Number Portability
LNS
Phone lines, “#LNS” means number of lines
LOCA
Loss of Coolant Accident
LOF
Loss of Frame
LOS
1) Line of Sight; 2) Loss of Signal
LPC
Linear Predictive Coding
LRC
Longitudinal Redundancy Check
LSA
Least Square Approximation
LSB
Least Significant Bit
LSO
Local Serving Office
LSP
Link-State Packet
LSU
Logical Storage Unit
LSZH
Low Smoke Zero Halogen
LT
Line Termination
LTGF
Loose Tube Gel Filled
LTU
Line Termination Unit
LULT
Line Unit LT
LWP
Low water peak
m
Meter
mA
Milliampere (one-thousandth of an ampere)
MAC
Media Access Control
MAE
Metropolitan Area Ethernet
MAHO
Mobile Assisted Handoff
MAN
Metropolitan Area Network
MAP
Multiple Application Platform, Linux powered chassis (Viavi); Mobile Application Part.
MARS
1) Mulitcast Address Resolution Server; 2) Mulitcast Address Resolution Server
MASER
1) Microwave Amplification by Stimulated Emission of Radiation
MATV
Master Antenna Television System
MAU
1) Media Access Unit; 2) Multistation Access Unit
MB
Megabyte
MBone
Mulitcast Backbone
Mbps
Megabites per second
MBS
Macimum Burst Size
MC
Main cross-connect
MC-CDMA / MCCDMA
Multi-Carrier Code Division Multiple Access
MCA
Micro-Channel Architecture
MCC
1) Maintenance Control Circuit; 2) Mobile Country Code
MCF
Million Conductor Feet
MCIA
Native Client Interface Architecture
MCM
1) Multi-Carrier Modulation; 2) One Thousand Circular Mils
MCPC
Mode conditioning patchcord
Mcps
Mega Chips per Second
MCR
Minimum Cell Rate
MCU
Multipoint Conferencing Unit
MCVD
Modified chemical vapor deposition
MCX
Micro Coaxial
MDA
Mobile Data Association
MDF
1) Medium Density Fiberboard; 2) Main Distribution Frame
MDPE
Medium-density polyethylene
MDSL
Multi-Rate Digital Subscriber Line
MDU
Multiple Dwelling Unit
MEM
Micro-electro-mechanical
MEMS
Micro-Electromechanical Sytems
MEO
Medium Earth Orbit
MERS
Most Economical Route Selection
MeT
Mobile Electronic Transactions Limited
MexE
Mobile Station Application Execution Environment
MFD
Mode-Field Diameter
MFJ
Modified Final Judgement
MFRA
MPLS and Frame Relay Alliance
MFT
One thousand feet
MFU
Multiple family unit
MG
1) Master Group; 2) Media Gateway
MGC
Media Gateway Controller
MGCP
Media Gateway Control Protocol
MH
Mobile Host
MHO
The unit of conductance equal to the reciprocal of the unit of resistance (ohm)
MHV
Miniature High Voltage
MHz
Megahertz
MIB
Management Information Base
Micro
One millionth
MIDP
Mobile Information Device Profile
MII
Media Independent Interface
MIL
1) Military specification for wire; 2) 0 001" (1/1000 inch) one 1000th of an inch
MIL-DTL-17
DSCC specification for Radio Frequency cables, flexible and semi-rigid
MIL-SPEC
United States Defense Standard, often called a military standard, "MIL-STD", or "MIL-SPEC" A MIL-SPEC for quality standards for electronic parts is MIL-STD-202
Milli
One-thousandth
MIME
Multi-Purpose Internet Mail Extensions
MIN
Mobile Identifications Numbers
minEMBc
Minimum calculated effective modal bandwidth
MiniBNC
Miniature bayonet Neill-Concelman
MIPS
Million Instructions Per Second
MJ
Modular Jack
ML-PPP
Multilink PPP
MLM
Multilongitudinal mode
MM
Mulitmedia Message
MMCX
Miniature micro-connector with snap on coupling mechanism
MMDS
Mulitchannel Multipoint Distributed Service
MMF
Multimode fiber
MMI
Man-Machine Interface
MMJ
Modified Modular Jack
MMM
Mobile Media Mode
MMS
Multimedia Messaging Service
MMSE
Multimedia Messaging Service Environment
MMTA
MultiMedia Telecommunications Association
MNP
Microcom Networking Protocol
MP
Mulitplexing
MPD
Mode power distribution
MPE
Multi-Pulse Excited
MPEG
Motion Picture Experts Group
MPF
Million paired feet
MPLS
Multi-Protocol Label Switching
MPO
Multifiber push-on connector
MPoA
Multi-Protocol Over ATM
MPT
Multipoint-to-Point Tunneling
MRB
Master Boot Record
MRCL
Maximum rated cable load
MRD
Manual Ring Down
MRO
Maintenance, repair and overhaul
MS
Mobile Station
MS-CDMA / MSCDMA
Mulitband Synchronous DS-CDMA
MS-DOS / MSDOS
Microsoft Disk Operating System
MSA
1) Metropolitan Serving Area; 2) Metropolitan Statistical Area
MSAU
Multi-Station Access Unit
MSB
Most Significant Bit
MSC
Mobile Switching Center
MSDS
Material safety data sheet
MSG
Multiservice Switching Forum
MSIR
Microsoft Internet Explorer
MSK
Minimum Shift Keying
MSO
Multiple System Operator
MSP
Managed Service Provider
MSS
1) Mobile Satellite System; 2) Mobile Service Station
MST
Multifiber service terminal
MSTP
Multiservice transport platform
MT
Mobile Terminal
MT-RJ / MTRH
Mechanical transfer registered jack
MTA
Major Trading Area
MTBF
Mean Time Between Failures
MTDC
Multitenant Data Center
MTJ
Master Test Jumper, launch and receive test cables, high quality Jumpers used to connect between the MAP/PCT instrument and the DUT.
MTP
Message Transfer Part
MTP (MPO)
Multi-channel (4 to 72) connector from USConec (MPO is generic version).
MTS
Message Telephone/Toll Service
MTSO
Mobile Telephone Switching Office
MTTR
Mean Time To Repair
MTU
1) Maintenance Termination Unit; 2) Multiple Tenant Unit
MTW
Thermoplastic insulated machine tool wire
MU
Message Unit
MULTOS
Multiple Operating System
MUTOA
Multiuser telecommunications outlet assembly
MUX
Multiplexer
mV
Millivolt; One thousandth of a volt
MVL
Multiple Virtial Lines
MVT
Moisture Vapor Transmission
mW
Milliwatt; One thousandth of a watt
N-AMPS / NAMPS
Narrowband Advanced Mobile Phone Service
N-CDMA / NCDMA
Narrowband Code Division Multiple Access
N-ISDN / NISDN
Narrowband Intergrated Service Digital Network
N/mm2
Newtons per squared mm
NA
Numerical aperture
NA W-CDMA / WCDMA
North American Wideband CDMA
NAA
Next Available Agent
NACC
North American Color Code; Hot=Black, Neutral=White, Ground=Green
NACN
North American Cellular Network
NACS
NetWare Asynchronous Communication Services
NADC
North America Digital Cellular
NAK
Negative Acknowledgement
NAM
Number Assignment Module
NANC
North American Numbering Council
NANOG
North American Network Operator’s Group
NANP
North America Numbering Plan
NAP
1) Network Access Point; 2) Network Access Provider
NARUC
National Association of Regulatory Utility Commissioners
NAT
Network Address Translation
NATA
North American Telecommunications Association
NATOA
National Asociation of Telecommunications Officers and Advisors
NBH
Network Busy Hour
NBMA
Mon-Broadcast Multi-Access
NBR
Butadiene-acrylonitrile copolymer rubber, a material with good oil and chemical resistance
NBS
National Bureau of Standards
NC
1) Network Computer; 2) No Circuit
NC Codes
Network Channel Codes
NCAS
Non-Call Associated Signaling
NCC
Network control center
NCCF
Network Communications Control Facility
NCP
Network Control Program
NCS
Net Control Station
NDIS
Network Driver Interface Specifications
NDUB
Network-Determined User Busy
NE
Network Element
NEBE
Near End Block Error
NEBS
Network Equipment Building System
NEC
National Electric Code
NECA
National Exchange Carrier Association
NEMA
National Electric Manufacturers Association
NEP
Noise Equivalent Power
NESC
National Electrical Safety Code
NFPA
National Fire Protection Association
NFS
Network File System
NGI
Next Generation Internet
NGN
Next Generation Network
NI
Network Interface
NIC
Network Interface Card
NIC Code
Network Channel Interface Code
NID
Network Interface Device
NIOSH
National Institute of Occupational Safety and Health
NIST
National Institute of Standards and Technology
NIU
Network Interface Device
NM
Non-metallic sheathed cable, braid or plastic covered For dry use, 60°C
NM-B / NMB
Non-metallic sheathed cable, plastic covered
NMC
Network Management Center
NMS
Network Managenent System
NMT
Nordic Mobile Telephone
NMTS
Nordic Mobile Telephone Service
NMVT
Network Mangement Vector Transport
NNI
Network-Node interface
NNTP
Network News Transfer Protocol
NOC
Network Operations Center
NOS
Network Operations System
NPF
Network Processing Forum
nrt-VBR
Non Real Time Variable Bit Rate
NRZ
Non-Return-to-Zero
NRZ-M / NRZM
Non-Return-to-Zero Mark
ns
Nanosecond
NSAP
Network Service Access Point
NSGR
Network Standards Generic Requirements
NSP
Network Service Provider
NSS
Network Switching Subsystem
NT
Network Termination
NTACS
Narrowband Total Access Communications System
NTIA
National Telecommunications and Information Administration
NTIS
National Technical Information Service
NTN
1) National Telecommunications Network; 2) Network Terminal Number
NTP
Network Time Protocol
NTSC
National Television Standards Committee
NTU
Network Termination Unit
NUL
Null Character
NVE
Network Visible Entity
NVIS
Near-Vertical-Incidence Skywave
NXX
Network Numbering Exchange
NZ-DSF / NZDSF
Non-Zero-Dispersion-Shifted Fiber
OA
Optical amplifier
OAC
Overlay Area Code
OADM
Optical Add Drop Mulitplexer
OAN
Optical Access Networking
OAS
Office Automation Systems
OC
Optical Carrier
OC-n or OCn
Optical Carrier Level n Signal
OCDMA
Optical code division multiple access
OCQPSK
Orthogonal Complex Quadrature Phase Shift Keying
OCR
Optical Character Recognition
OCX
Object Linking and Embedding (OLE) control
OD
Outside Diameter
ODI
Open Datalink Interface
ODN
Optical Distribution Network
ODU
Optical Demultiplexer Unit
OE
Optical-to-Electrical
OEE
Optical Entrance Enclosure
OEIC
Optoelectronic Integrated Circuit
OEM
Original Equipment Manufacturer
OEO
Optical–electrical–optical
OFCP
Optical fiber conductive plenum
OFCR
Optical fiber conductive riser
OFDM
Orthogonal Frequency-Division Multiplex
OFHC
Oxygen-free, high-conductivity copper
OFNP
Optical fiber nonconductive plenum
OFNR
Optical fiber nonconductive riser
OFSTP
Optical fiber system test procedures
OHG
Operators Harmonization Group
OHMS
A measure of resistance
OI
Optical isolator
OLE
Object Linking Embedding
OLS
Optical line system
OLT
Optical line terminal
OLTP
Online Transaction Processing
OLTS
Optical loss test set
OM
Optical multimode
OMA
Open Mobile Alliance
OMU
Optical multiplexer unit
ONT
Optical network terminal
ONU
Optical Network Unit
OPA
1) Outside-Premise-Addressability Unit; 2) Online Privacy Alliance
OPGW
Optical power ground wire
OPM
Optical power meter
OPS
Optical protection switch
OPX
Off Premises Extension
OQPSK
Offset Quadrature Phase Shift Keying
ORB
1) Object Request Broker; 2) Office Repeater Bay
org
Generic top-level Internet domain name
ORL
Optical return loss
OS
Operating System
OS/NE
Operations System/Network Element
OSA
1) Optical spectrum analyzer; 2) Optical subassembly; 3) Optical Society of America
OSHA
Occupational Health and Safety Administration
OSI Model
Open System Interconnection Model
OSNR
Optical signal-to-noise ratio
OSP
Outside plant
OSPF
Open Shortest Path System
OSS
Operations Support System
OSSI
Operations Support System Interface
OTASP
Over-The-Air Service Provisioning
OTDM
Optical time-division multiplexing
OTDR
Optical Time-Domain Reflectometer
OTN
Optical transport network
OUT
Optical translator unit
OXC
Optical cross connect
P2MP
Point to multipoint
P2P
Point to point
P2P-
Peer-to-Peer
PA
Power Amplifier
PABX
Private Automatic Branch Exchange
PACS
Personal Access Communications System
PAD
Packet Assembler/Disassembler
PAL
1) Phase Alternation by Line; 2) Public Access Line
PAM
Pulse Amplitude Modulation
PAN
Personal Area Network
PAP
Password Authentication Protocol
PAS
Personal Access System
PB
Petabyte
PBT
Poly-Butylene Terephthalate
PBX
Private Branch Exchange
PCB
Printed Circuit Board
PCI
Peripheral Component Interconnect PC Bus Interface
PCM
Pulse Code Modulation
PCT
Passive Component Tester, application that runs on MAP.
PCVD
Plasma activated chemical vapor deposition
PDA
Personal Data Assistant
PDC
1) Pacific Digital Cellular; 2) Personal Digital Cellular
1) Portable Document Format; 2) Probability Density Function
PDFA
Praseodymium-doped fiber amplifier
PDH
Plesiosynchronous Digital Hierarchy
PDL
Polarized dispersion loss
PDLC
Polarization dependent loss compensation
PDM
Polarization division multiplexing
PDN
Public Data Network
PDS
Premise Distribution system
PDU
Protocol Dada Unit
PE
Polyethylene
PEL
Permissible Exposure Limit
PET
polyethylene terephthalate
pH
Measure of Acidity
PIC
Primary Interexchange Carrier
PIC Code
Pre-subscribed/Primary Inter-LATA Carrier Code
PICMG
PCI Industrial Computer Manufacturers Group
PICMG 2.16
PICMG “Ethernet backplane” standards
PICO
One-millionth of one-millionth
PIN
Positive-intrinsic-negative
PIN-FET
Positive-intrinsic-negative field-effect transistor
PING
Packet INternet Groper
PINT
PSTN/Internet INTernetworking
PKCS
Public-Key Cryptography Standards
PKI
Public Key Infrastructure
PL
Private Line
PLC
Packet Loss Concealment
PLI
Pounds per linear inch
PLL
Phase Locked Loop
PLMN
Public Land Mobile Network
PLOAM
Physical layer operations, administration, and maintenance
PM
Phase Modulation
PM-QPSK / PMQPSK
Polarization multiplexed quadrature phase shift keying
PMD
Polarization mode dispersion
PMDC
Polarization mode dispersion compensation
PMR
Private Mobile Radio
PNCQPSK
Psuedo-Noise Complex Quadrature Phase Shift Keying
PNNI
Private Network Node Interface
PnP
Plug and Play
POCS
Plain Old Cable Service
POF
Plastic optical fiber
POI
Point of Interface
PON
Passive Optical Network
POP
Point o Presence
POTP
Passive optical transport platform
POTS
Plain Old Telephone Service
PP
Polypropylene
PPD
Partial Packet Discard
PPE
Personal protective equipment
PPM
Parts per million
PPP
Point-to-Point Protocol
PPP/MD
Point-to-Point Protocol/Mulitlink Protocol
PPTP
Point-to-Point Tunneling Protocol
PRA
Primary Rate Access
PRBS
Pseudo-Random Binary Sequence
PRI
Primary Rate Interface
PRMA
Packet Reservation Multiple Access
PROM
Programmable Read-Only Memory
PRP
Primary Routing Point
PRS
Primary Reference Signal
PS
polystyrene
PSACR
See POWER SUM ATTENUATION TO CROSSTALK RATIO
PSAP
Public-Service Answering Point
PSC
Public Service Commission
PSD
Power Spectral Density
PSI
Pounds per square inch
psia
Pounds per square inch absolute
PSK
Phase Shift Keying
PSN
1) Packet-Switching Network; 2) Public Switching Network
PSTN
Public Switching Telephone Network
PTFE
Polytetrafluoroethylene
PU
Physical Unit
PUC
Public Utilities Commission
PUC/PSC
Public Utility Commission/Public Service Commission
PUR
Polyurethane
PVA
polyvinyl alcohol
PVC
1) Permanent Virtual Circuit/Connection; 2) Polyvinyl Chloride
PVD
Polyvinylidene Fluoride (see also Kynar®)
PVP
Permanent Virtual Path
PWM
Pulse-Width Modulation
PXC
Photonic cross connect
Q
Quadrature-Phase
QA
Quality Assurance
QAM
Quadrature Amplitude Modulation
QC
Quality Control
QCIF
Quarter Common Interchange Format
QDM
Double-band amplitude modulation
QLLC
Qualified Logical Link Control
QoS
Quality of Service
QPM
QoS Policy Manager
QPSK
Quadrature Phase-Shift Keying
QRS
Quasi-Random Signal
QRSS
1) Quasi-Random Signal Sequence; 2) Quasi-Random Signal Source
QRST
Quasi-Random Test Signal
QRW
Quasi-Random Word
QSIG
Q Signaling
Quad
A four conductor cable
QWP
Query With Permission
R
Interface
RA
Remote Access
RACE
Research in Advanced Communications Equipment
RACH
Random Access Channel
RAN
Radio Access Network
RBOC
Regional Bell Operating Company
RBS
Rated breaking strength
RC
1) Radio Configuration; 2) Rate Center; 3) Repeating Coil
RCC
Radio Common Carrier
RCCN
Radio Common Carrier Number
RCVR
Receiver
RD
Resistance Design
RDBMS
Radio Data Base Management System
RDRAM
Rambus Direct RAM
REA
Rural Electrification Administration
REAG
Regional Economical Area Grouping
REL
Recommended Exposure Limit set by NIOSH
REXX
An interpreted script language development by IBM
RF
Radio Frequency
RFC
Request for Comment
RFI
1) Radio Frequency Interference; 2) Request for Information
RFoG
Radio frequency over glass
RFP
Request For Proposal
RFQ
Request For Quote
RFTS
Remote fiber test system
RG/U
Radio Government, Universal
RGB
(Red, Green and Blue), the basic parallel component set, in which a signal is used for each primary color
RIN
Relative intensity noise
RIP
Routing Information Protocol
RITL
Radio In The Loop
RJ
Registered Jack
RJ-11 / RJ11
Registered Jack 11
RJ-45 / RJ45
Registered Jack 45
RL
Return Loss.
RLCG
Resistance (R, ohms/km), Inductance (L, mH/km), Capacitance (C, nF/km), and Conductance (G, mho/km)
RLE
Run Length Encoding
RLIN
Return loss of input connector.
RLOUT
Return loss of output connector (if measured).
RMII
Reduced Media Independent Interface
RML
Restricted mode launch
RMON
Remote Monitoring
RMS or rms
Root-mean-square
ROADM
Reconfigurable optical add/drop multiplexer
RoHS
European Union directive that stands for "the Restriction of the use of certain Hazardous Substances in electrical and electronic equipment" This directive bans the placing on the EU market of new electrical and electronic equipment containing more than agreed levels of lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE) flame retardants It went into effect July 1, 2006
ROJ
The designation to Remove Outer Jacket
ROM
Read-Only Memory
ROSA
Receiver optical subassembly
ROW
Rights of way
RPC
Remote Procedure Call
RPE-LTP / RPELTP
Regular Pulse Excited-Long Term Prediction
RRD
Revised Resistance Design
RS
Recommended Standard
RS-170A / RS170A
The EIA technical standard for NTSC color television
RS-232 / RS232
Recommenced Standards 232 (Physical interface between DCE and DTE)
RSA
Rural Service Area
RSSI
Received Signal Strength Indication
RSVP
Resource Reservation Protocol
RT
Ringback Tone
rt-VBR / rtVBR
Real-Time Variable Bit Rate
RTCP
Real-Time Control Protocol
RTE
Real-Time Enterprise
RTM
Reference test method
RTMS
Radio Telephone Mobile System
RTP
Real-Time Transfer Protocol
RTSP
Real-Time Streaming Protocol
RTU
Remote Termination Unit
RU
Rack unit
RUS
Rural Utilities Service
Rx
Receive or receiver
S
S Interface
S-band / Sband
The frequency spectrum from 2 GHz to 4 GHz used for land based microwave and some mobile satellite communications
S-UMTS / SUMTS
Satellite Universal Mobile Telephone System/Standards
S/I
Signal-to-Inference Ratio
S/N
Signal-to-Noise Ratio
SA
Switched Access
SAA
Systems Application Architecture
SAC
Service Access Code
SACCH
Slow Associated Control Channel
SAE
Society of Automotive Engineers
SAFT
Shear Adhesion Failure Temperature
SALT
Speech Application Language Tags
SAM
Service Access Multiplexer
SAMA
Spread Aloha Multiple Access
SAMM
Service Access, Mediation, and Management
SAN
Storage area network
SANZ
Standards Association of New Zealand
SAP
Service Access Point
SAR
1) Specific Absorption Rate; 2) Segmentation and Reassembling
SAT
Set-up Audio Tone
SAT-CDMA / SATCDMA
Satellite-based CDMA
SBC
1) Session Border Controller; 2) Soft bare copper
SBR
A copolymer of styrene and butadiene Also GR-S or Buna-S Most commonly used type of synthetic rubber
SBS
Stimulated Brillouin scattering
SC
1) Signaling Converter; 2) Switching Center
SCC
Specialized Common Carrier
SCCH
Signaling Common Channel
SCCP
1) Signaling Connection Control Part; 2) Skinny Client Control Protocol
SCE
Service Creation Environment
SCF
Service Control Function
SCH
Synchronization Channel
SCN
Switched Circuit Network
SCP
Service Control Point
SCR
Sustainable Cell Rate
SCSI
Small Computer System Interface
SCTE
Society of Cable Telecommunications Engineers
SD
Service drop cable
SDARS
Satellite Digital Audio Radio Service
SDCCH
Slow Dedicated Control Channel
SDH
Synchronous Digital Hierarchy
SDK
Software Developers’ Kit
SDLC
Synchronous Data Link Control
SDM
Spatial Division Multiplexing
SDMA
Space Division Mulitple Access
SDN
Software Defined Network
SDP
Session Definition/Description Protocol
SDR
Software Defined Radio
SDRF
Software Defined Radio Forum
SDSL
Symmetric Digital Subscriber Line
SDTV
Standard Definition Television
SDU
Service Data Unit
SDV
Switched digital video
SE
Above ground service entrance cable, not protected against mechanical abuse Flame-retardant, moisture-resistant covering Overall neoprene sheath, 60°C-75°C
SECAM
Sequential Couleur avec Memoire
SEFT
Severely Errored Framing Second
SER
Service round entrance cable (Type SE, Style R)
SERDES
Serializer/deserializer
SET
Secure Electronic Transaction
SEU
Service Entrance Cable (type SE, style U) (Unarmored)
SF
Super Frame
SFF
Small form factor
SFHMA
Slow Frequency-Hopped Mulitple Access
SFP
Small form factor pluggable
SFS
Single-Frequency Signaling
SFTS
Single-Frequency and Time Signal
SG
Signaling Gateway
SGCP
Simple Gateway Control Protocol
SGML
Standard Generalized Markup Language
SGNT
Special Grade Network Trunked
SGTRAN
Signaling Transport
SHDSL
See G SHDSL
SHF
Super High Frequency
SHR
Self-healing ring
SHV
Safe High Voltage
SI
International System of Units
SIA
Steel Interlocked Armor
SIC
Specific Inductive Capacity
SID
1) Silence Insertion Descritiptor; 2) Sudden Ionospheric Disturbance
SIGINT
Signal Intelligence
SIM
Subscriber Identity Module
SIM Card
Subscriber Identity Module Care
SIMD
Single Instruction Multiple Data
SIMPLE
SIP for Instant Messaging and Presence Leveraging Extensions
SIN
SIP/IN Internetworking
SIP
Session Initiation Protocol
SIP BCP-T / BCPT
SIP Best Common Practice for Telephony
SIP+
Session Initiated Protocol+
SIP-T / SIPT
Session Initiation Protocol for Telephony
SIPPING
Session Initiation Protocol Project Investigation
SLA
Service Level Agreement
SLC
Subscriber-Loop Carrier
SLED
Surface-emitting LED
SLEE
Service Logic Execution Environment
SLIC
Subscriber line interface circuit
SLIP
Serial Line Internet Protocol
SLM
Single-longitudinal mode (laser)
SMA
Subminiature type A connector
SMB
Subminiature B
SMC
Subminiature C
SMDS
Switched Mulitmegabit Data Service
SMF
Single-mode fiber
SMFCB
Subcarrier Modulated Fibre-Coax Bus
SMG
Supermastergroup
SMII
Serical MII
SMON
Switch Monitor
SMP
Symmetric Multiprocessing
SMPE
Society of Motion Picture and Television Engineers
SMPTE
Society of Motion Picture Television Engineers
SMR
Specialized Mobile Radio
SMS
Short Message Service
SMSC
Short Messaging Service
SMT
Surface Mount Technology
SMTP
Simple Mail Transfer Protocol
SNA
System Network Architecture
SNMP
Simple Network Management Protocol
SNR
Signal-to-Noise Ratio
SO
1) Service Order; 2) Switching Office
SOA
Semiconductor optical amplifier
SOAP
Simple Object Access Protocol
SOH
Start of Header
SOHO
Small Office/Home Office
SONET
Synchronous Optical Network
SOP
State of polarization
SPARC
Sealable Processor Architecture
SPC
1) Stored Program Control; 2) Silver plated copper
SPCW
Silver Plated Copper Weld
SPIE
Society of Photographic Instrumentation Engineers
SPIRITS
Services in the PSTN/IN Requesting Internet Services
SPM
Self phase modulation
SQA
Software Quality Assurance
SQL
Structured Query Language
SR
Spread Rate
SRAM
Static RAM
SRD
Portable range or dryer cable
SS
1) Spread Spectrum; 2) Supervisory Signal
SSB
Single Sideband Radio
SSCOP
Service Specific Connection Oriented Protocol
SSD
Shared Secret Data
SSID
Service Set Identifier
SSMA
Sub-Subminiature A
SSP
Service Switching Point
STB
Set-Top Box
STD
Selective Transmit Diversity
STEL
Short term exposure limit
STM
Synchronous Transfer Mode
STP
Shielding Twisted Pair
STS
1) Serving Translation Scheme; 2) Shared Tenant Service; 3) Synchronous Translations Scheme
STS-n / STSn
Synchronous Transport Signal-n
STW
Hard usage cord, jacketed
STX
Start Of Text
SU
Service User
SVC
Switched Virtual Circuit
SVOD
Switched video on demand
SW-CDMA / SWCDMA
Satellite-based Wideband CDMA
SW1
Switch connected to output J1.
SW2
Switch connected to J2 or to Detector.
SWC
Service Wire Center
SWR
Standing Wave Ratio
SX
Simplex Signaling
SYSGEN
System Generation
T
Interface (between ISDN NT1 and NT2)
T.120 / T120
An ITU-T standard for document conferencing
T.30 / T30
International standard protocol for standard transmission of taxes, originally meant for circuit-switched lines
T.37 / T37
Standard for store-and –forward FoIP (Fax-over-IP)
T.38 / T38
Standard for real-time FoIP (Fax-over-IP)
T1
Tier 1 T-Carrier
T1C
Tier 1C = DS1c-formatted (concatenated) digital signal at 3 153 Mbps ; the equivalent of 48 voice channel
T2
Tier 2 = DS-2-formatted digital carrier signal at 6 312 Mbps ; the equivalent of 94 voice channel
T3
1) Tier 3
TABS
Telemetry Asynchronous Block Serial
TACACS
Terminal Access Controller Access Control System
TACS
Total Access Communications System
TADIL
Tactical Data Information Link
TAI
Temporary Mobile Station Identity
TAPI
Telephony Application Program Interface
TARP
TID Address Resolution Protocol
TASI
Time-Assignment Speech Interpolation
TAT
Trans-Atlantic Telecommunications (cable)
TAXI
Transparent asynchronous transmitter receiver interface
TB
1) Terabyte; 2) Terminal Block
TBD
To Be Determined
TBOS
Protocol-Telemetry Byte-Oriented Serial Protocol
TC
1) Telephony Controller; 2) Traffic Contact; 3) Toll Center
TCA
Telecommunications Access
TCAM
Telecommunications Access Method
TCAP
Transaction Capability Application Part
TCF
Technical Control Facility
TCH
Traffic Channel
TCIF
Telecommunications Industry Forum
TCM
1) Time Compression Multiplexing; 2) Trellis Code Modulation
TCP
Transmission Control Protocol
TCP/IP
Transmission Control Protocol/Internet Protocol
TD-SCDMA / TDSCDMA
Time Division Synchronous CDMA
TDD
1) Telecommunication Device for the Deaf; 2) Time Division Duplex
TDM
Time Division Multiplexer/Multiplexing
TDMA
Time Division Multiple Access
TDN
Temporary Directory Number
TDR
Time Domain Reflectometry/ Time Domain Reflectometer
TDTD
Time Division Transmit Diversity
TE
ISDN Terminal Equipment
TE1
ISDN Terminal Equipment Type 1
TEC
Thermoelectric cooler
TED
Trunk Encryption Device
TEHO
Tail End Hop Off
TEK
Traffic Encryption Key
TEM
Telecom Equipment Manufacturer
TETRA
Trans-European Trunked Radio Access
TEW
Canadian Standard Association type appliance wires
TFE
Teflon (tetrafluoroethylene)
TFFN
Fixture wire, thermoplastic-covered with flexible stranding and nylon sheath, 90°C dry
TFTP
Trivial File Transfer Protocol
Tg
Glass transition temperature below which a polymer is a hard glassy material
TGW
Trunking Gateway
TH
Transmission Header
THHN
90°C, 600 V nylon jacketed building wire
THICKNET
IEEE 802 3 10BASE-5 systems
THIN ETHERNET
10BASE-2 system
THz
Terahertz
TIA
Telecommunications Industry Association
TIC
Token-Ring Interface Coupler
TID
1) Terminal Identifier; 2) Tunnel Identifier
TINA Consortiun
Telecommunications Information Networking Architecture Consortium
TIRKS
Trunk Integrated Records Keeping System
TKIP
Temporal key Integrity Protocol
TL
Transmission Level
TLD
Top-Level Domain
TLS
Transport Layer Security
TLV
Threshold Limit Value set by the ACGIH
TM
1) Traffic Management; 2) Melting Temperature
TM Forum
Telemanagement Forum
TMC
Traffic management center
TMN
Telecommunications Managenment Network
TMRS
Traffic Measurement And Recording Systems
TNC
Threaded Neill Concelman
TO
Toll Office
TOP
Technical Office Protocol
TOS
Type of Service
TOSA
Transmitter optical subassembly
TP
Tunneling Protocol
TPON
Telephony over Passive Optical Network
TR
Toll Restriction
TSAPI
Telephony Services Application Programming Interface
TSCA
Toxic Substance Control Act
TSGR
Transport Systems Generic Requirements
TSP
Telecommunications Service Priority Service
TSPS
Traffic Service Position System
TSS
Tandem Switching System
TSTD
Time Switched Transmit Diversity
TT
Trunk Type
TTA
Telecommunications Technology Association
TTC
Telecommunications Technology Priority Service
TTL
Transistor-transistor logic
TTS
Text-to-Speech
TTTN
Tandem Tie Trunk Network
TTY
Teletypewriter
TUR
Trunk Utilization Report
TVoIP
TV over IP
TW
Thermoplastic vinyl-jacketed building wire
TWA
Time weighted average
TX/RX
Transmit/Receive
U
A vertical unit of measurement (1 75 inches)
UA
User Agent
UAC
User Agent Client
UADSL
Universal ADSL
UART
Universal Asychronous Reveiver/Transmitter
UAS
User Agent Server
UCLC
Universal Digital Channel
UDP
User Datagram Protocol
UF
Thermoplastic underground feeder and branch circuit cable
UFB
Underground feeder cable
UG
Universal Government
UHDTV
Ultra high definition television
UHF
Ultra High Frequency
UI
Unit Interval
UIM
Usre Idnetity Module
UL
1) Underwriter’s Laboratories; 2) Uplink (Also written as U/L)
ULF
Ultra Low Frequency
ULP
Upper-Layer Protocol
UMTS
Universal Mobile Telephone System/Standard
UNE
Unbundled Element
UNI
User Network Interface
UNNI
Unlicensed National Information Infrastructure
UPC
Specific fiber optic contact polishing protocol (process), yielding improved return loss
UPN
User Provided Number
UPnP
Universal Plug and Play
UPS
Uninterruptible Power Supply
UPT
Universal Personal Telecommunications
URI
Uniform Resource Identifier
URL
Uniform Resource Locator
USART
Universal Synchronous/Asynchronous Receiver Transmitter
USASI
United States of America Standards Institute—now called ANSI (American National Standards Institute)
USB
Universal Serial Bus
USE
Underground Service Entrance Cable
USTA
United Stated Telephone Association
UT
Universal Time
UTC
Coordinated Universal Time
UTP
Unshielded Twisted Pair
UTRA
UMTS Terrestrial Radio Access
UUCP
UNIX-to-UNIX Copy Protocol
UUT
Unit Under Test
UV
Ultraviolet Light
UVM-C / UVMC
Universal Voice Module-Channelized
UVM-U / UVMU
Universal Voice Module-Unchannelized
UWB
Ultra Wide Band
UWC
Universal Wireless Consortium
UWCC
Universal Wireless Communications Consortium
V
1) Interface (between an ISDN ET and LT or LE); 2) Vertical side of MDF; 3) Volt
VA
Volt Ampere
VAC
Volts Alternating Current
VAD
Voice Activity Detection, Voice Activity Detector
VADSL
Very High Speed ADSL
VAN
Value Added Network
VANS
Value-Added Network Service
VAR
Value-Added Reseller
VARS
Volt-Amperes Reactive
VB
Visual Basic
VBR
Variable Bit Rate
VBScript
Visual Basic Script
VC
1) Virtual Channel; 2) Virtual Circuit
VCA
Voice Connecting Arrangement
VCC
Virtual Channel Connection, Virtual Circuit Channel
VCD
Virtual Circuit Descriptor
VCI
Virtual Channel Identifier
VCL
Virtual Channel Link
VCSEL
Vertical-Cavity Surface-Emitting Laser
VDA
Video Distribution Amplifier
VDT
Video/Visual Display Terminal
VDU
Video/Visual Display Unit
VF
Voice Frequency
VFC
Voice frequency channels
VFCT
Voice Frequency Carrier Telegraph
VFTG
Voice Frequency Telegraph
VG
Voice Grade
VGF
Voice Grade Facility
VHE
Virtual Time Environment
VHF
Very High Frequency
VHSLD
Very-High bit rate Digital Subscriber Line
VIP
Video Information Provider
VITA
VMEbus International Trade Association
VLAN
Virtual LAN
VLF
Very Low Frequency
VLR
Visitor Location Register
VMOA
Voice and Multimedia over ATM
VNL
Via Net Loss
VOA
Variable optical attenuator
VoATM
Voice over Asynchronous Transfer Mode
VoB
Voice over Broadband
VOC
Volatile Organic Compound
VoCable
Voice over Cable
VOD
Video On Demand
Vodas
Voice-Operated Device Anti-Sing
VoDSL
Voice over Digital Subscriber Line
VoE
Voice over Ethernet
VoFr
Voice Over Frame Relay
Vogad
Voice-Operated Gain-Adjusting Device
VoHDLC
Voice over DLC
VoIP
Voice Over Internet Protocol
Volt
Standard Unit of Electromotive Force or Electrical Pressure
VoMBN
Voice over Multiservice Broadband Network
VON®
Voice on the Net
VON® Coalition/ VON Coalition
Voice on the Net Coalition
VoP
Voice over Packet
VoWiFi
Voice over WiFi
VoWIP
Voice over Wireless IP
VoWLAN
Voice over Wireless Local Area Network
VoWLL
Voice over Wirless Local Loop
VP
Virtial Path
VPC
Virtial Path Connection
VPDN
Virtial Private Dial-up Netwrok
VPI
Virtual Path Connection
VPIM
Voice Profile for Internet Messaging
VPML
Virtual Reality Modeling Language
VPN
Virtual Path Identifier
VPON
Video passive optical network
VRU
Voice Response Unit
VSAT
Very Small Aperture Terminal
VSB
Vestigial Sideband
VSELP
Vector Sum Excited Linear Predictive
VSPT
Voice Services Provisioning Tool
VSWR
Voltage Standing Wave Ratio
VT
1) Virtual Terminal; 2) Virtual Tributary
VT-n / VTn
Virtual Tributary Level N
VTAM
Virtual Telecommunications Access Method
VtoA
Voice and Telephony over ATM
VTP
Virtual Terminal Protocol
VTR
Video Tape Recorder, an electro-mechanical device that records, stores and reproduces an electronic signal that contains audio, video and control information
VTU
Video Teleconferencing Unit
VTU-C / VTUC
VDSL Transmission Unit Central Office
VU
Volume Unit
W
Watt or Wattage
W-CDMA / WCDMA
Wideband Code Division Multiple Access
W/O/G
Without ground
W3C
W3 Consortium
WA
Work area
WAIS
Wide Area Information Server
WAN
Wide Area Network
WAP
Wireless Application Protocol
WARC
World Administrative Radio Conference/Consortium
WASP
Wireless Application Service Provider
WATS
Wide Area Telecommunications Service
WB
Wideband
WBMP
Wireless Bitmap
WC
Wire Center
WCA
Wireless Communications Association
WCS
Wireless Communications Services
WDM
Wavelength Division Multiplexing
WDM-PON / WDMPON
Defined by FSAN as a next generation (NG2) network in which each subscriber is assigned their own wavelength
WECA
Wireless Ethernet Compatibility Alliance
WEP
Wired Equivalent Privacy
WGQ
Weighted Fair Queuing
WHMIS
Workplace Hazardous Material Information System
WIC
Wavelength independent coupler
WiFi
Wireless Fidelity
WiMAX
Worldwide Interoperability for Microwave Access, also know as IEEE 802 16
WIMS W-C / WC
Wireless Mulitmeda and Messaging Services Wideband CDM
WIN
Wireless Intelligent Network
WISP
Wireless Local Service Provider
WLAM
Wireless Local Area Network
WLL
Wireless Local Loop Sometimes called Radio in the Loop, Fixed Radio Access to Fixed Wireless Local Loop
WLNP
Wireless Local Number Portability
WM
Wireless Instant Messaging
WML
Wireless Markup Language
WMLScript
Wireless Markup Language Script
WORD
Number of bits transmitted in parallel on a data bus
WOS
Wireless Office Systems
WPA
WiFi Protected Access
WPABX
Wireless Private Automatic Branch Exchange
WPAN
Wireless Personal Area Network
WPCDMA
Wideband Packet Code Division Multiplex Access
WRC
World Radiocommunication Conference
WRED
Weighted Random Early Detection
WSS
Wavelength selectable switch
WTLS
Wireless Transport Layer Security
WWAN
Wireless Wide Area Network
WWMCS
Worldwide Military Command and Control System
WWW
World Wide Web
WXC
Wavelength cross connect
X
Variable for Electrical Reactance
XC
Cross-Connect
XFP
10 Gigabit small form factor pluggable
XHTML
Extensible Hypertext Markup Language
XLP
Cross-linked polyethylene
XMD
10 Gb/s miniature device
XMISSION
Transmission
XMIT
Transmit
XML
Extensible Markup Language
Xmodem
File transfer protocol
XO
Crystal Oscillator
XOFF
ASCII Transmitter Off Character
XON
ASCII Transmitter On Character
XPM
Cross phase modulation
XT
Crosstalk
Z
Variable for Electrical Impedance
ZBTSI
Zero Byte Time Slot Interchange
ZDA
Zone Distribution Area
ZWP
Zero Water Peak