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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

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

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+

Session Initiated Protocol+

SIP-T

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

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