(800) 473-4237 / 508-992-6464 sales@focenter.com

FOC Acronyms

View: Glossary, Acronyms, Military Specifications for Connectors

All | # 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
There are currently 2053 names in this directory
#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
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-ISDN
Broadband ISDN

B-PON
Broadband passive optical network

B.C.
Bare Copper

B+S
Brown and Sharpe wire gauge, same as AWG

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
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.
Canadian Standards Association, a non-profit, independent organization which operates a listing service for electrical and electronic materials and equipment

C.V.
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
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
Cordless Telephone-First Generation, or any variety of North American, European, and Japanese analog cordless telephone

CT-2
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
A serial digital recording format

D-2 Format
A composite digital recording format

D-3 Format
A composite digital recording format

D-AMPS
Digital Advanced Mobile Phone System/Service

D.C.
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
Electronic Mail

E-Netz
German name for GMS 1800 network

E-TDMA
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.
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
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
Gigabit PON

G.7xx-
A family of ITU standards for audio compression

G.dmt
ADSL using Discrete Multitone Modulation

G.Lite
Universal ADSL (UADSL), DSL Lite or ADSL Lite

G.SHDSL
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
Graded-index multimode fiber

GI-POF
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
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
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
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
HDLS Terminal Unit-Central Office

HTU-R
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
See cdma2000® 1XRTT

IMT-CDMA Multicarrier 3X
See MC-3X

IMT-DS
International Mobile Telecommunications Direct Spread

IMT-MC
International Mobile Telecommunications Multi-Carrier

IMT-SC
International Mobile Telecommunications Single Carrier

IMT-TC
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
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
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
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
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
Mulitband Synchronous DS-CDMA

MS-DOS
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
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
Narrowband Advanced Mobile Phone Service

N-CDMA
Narrowband Code Division Multiple Access

N-ISDN
Narrowband Intergrated Service Digital Network

N/mm2
Newtons per squared mm

NA
Numerical aperture

NA W-CDMA
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
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
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
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

PDF
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
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
Registered Jack 11

RJ-45
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
Regular Pulse Excited-Long Term Prediction

RRD
Revised Resistance Design

RS
Recommended Standard

RS-170A
The EIA technical standard for NTSC color television

RS-232
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
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
The frequency spectrum from 2 GHz to 4 GHz used for land based microwave and some mobile satellite communications

S-UMTS
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
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
SIP Best Common Practice for Telephony

SIP-T
Session Initiation Protocol for Telephony

SIP+
Session Initiated Protocol+

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
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
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
An ITU-T standard for document conferencing

T.30
International standard protocol for standard transmission of taxes, originally meant for circuit-switched lines

T.37
Standard for store-and –forward FoIP (Fax-over-IP)

T.38
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
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
Universal Voice Module-Channelized

UVM-U
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
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
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
VDSL Transmission Unit Central Office

VU
Volume Unit

W
Watt or Wattage

W-CDMA
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
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
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

If you would like to offer Fiber Optic Center any requests for edits, changes or additions to this Glossary, please contact us at FOCGlossary@focenter.com.

We consider this a resource for everyone in our community and intend to make it as helpful as possible so share your thoughts on how we can keep improving.



Technical Information