Always under construction By Hugh Stegman nv6H

(2) Certified Public Accountant

CPAS Cellular Priority Access Service

CPCA Camp Parks Communications Annex (USAF)

CPDL Controller-Pilot Data Link

CPDLC Controller-Pilot Data Link Communications

CPE Customer Premise Equipment (telco)

CPFSK Continuous-Phase Frequency Shift Keying

CPM Continuous Phase Modulation

CPO Chief Petty Officer

CPR Cardio-pulmonary resuscitation

CPRM Content Protection for Recordable Media

CPS (1) Characters Per Second

(2) Cellular Priority Services (US NCS)

cps Cycle per second (one Hertz)

CPT Captain (US Army)

CPU Central Processing Unit (computer h/w)

CPW CoPlanar Waveguide

CPX Command Post Exercise (NATO)

CQ General call: "Hello all stations"

CQD "Hello All Stations, Distress," no longer used

CQFP Ceramic Quad Flat Pack

CQWW CQ World Wide (Amateur DX contest)

CR Carriage Return

CRAF Civil Reserve Air Fleet

CRATT Crypto Radio Teletype (usually military & encrypted)

CRC (1) Cyclic Redundancy Check (computer error test)

(2) CONUS Replacement Center

(3) Control & Reporting Center

CRE Control & Reporting Element

CREW Counter RCIED Electronic Warfare (Nested Acronym)

CREN Corporation for Research and Educational Networking

CRIS Communications Resource Information Sharing (US NCS)

CRM Computer Resource Management

CRO (1) Cathode-Ray Oscilloscope

(2) Croatia (country code)

(3) Coaxial Resonator Oscillator

CROSS Centres Regionaux Opérationnels de Surveillance et de Sauvetage

(French RCC, see RCC)

CROWD36 Russian diplomatic MFSK mode

CRPLF French language: Francophonic Public Radio Community

CRR Carrier

CRRL Canadian Radio Relay League

CRS Coastal Radio Station

CRT Cathode-Ray Tube (usually a computer terminal)

CRTC Combat Readiness Training Center

CS (1) combat support

(2) communication squadron

(3) Chicken S-it

(4) Chemical Shield (a tear gas)

CS&C Office of Cybersecurity and Communications (DHS)

CSAF Air Force Chief of Staff

CSAR Combat Search and Rescue

CSARP Common SAR Processor

CSB Corps support battalion

CSC (1) Combat Support Center (AFOC)

(2) Combat stress control

(3) Computer Software Component

CSCI Computer Software Configuration Item

CSE Client/Server Environment

CSEL Combat Survivor Evader Locator (pilot survival radio)

CSG (1) Carrier Strike Group

(2) Corps support group

CSH Combat support hospital

csh C-shell, popular Unix command interpreter

CSL Coupled Slot Antenna

CSM Combined Symbol Matching

CSMA/CD Carrier Sense Multiple Access/ Collision Detection

CSOM Computer Software Operators Manual

CSP Communications Support Processor

C-SPAN Cable-Satellite Public Affairs Network (US)

CSQ Carrier SQuelch

CSS (1) Combat service support

(2) Central Security Service (US SIGINT, run by NSA director)

(3) Cascading Style Sheets

(4) Content Scrambling System (DVD encryption)

CSSCS Combat Service Support Control System

CST (1) Central (US) Standard Time

(2) Caribbean Support Tender

(3) Civil Support Team

CSTARS COMBAT SENT Technical Acquisition Receiver System

CSU Computer Software Unit

CT (1) Center Tap

(2) ("Charlie Tango") - Communications Technician (on an aircraft)

(3) Cordless Telephone

CT-2 Cordless Telephone - 2nd generation

CTA Control Area

CTAF Common Traffic Advisory Frequency

CTAPS Contingency Tactical Air Combat System

CTBT Comprehensive Test Ban Treaty

CTC (1) Centralized Traffic Control (railroad)

(2) Counter-Terrorism Command

CTCSS Continuous Tone Coded Squelch System ("PL")

CTI Computer - Telephone Integration

CTIA Cellular Telecommunications Industry Assn

CTLZ Control Zone

CTP (1) Common Tactical Picture

(2) Critical Technical Parameter

CTR (1) Common Technical Regulations

(2) Combat Training Range

Ctrl (1) Control

(2) Computer's control key, sometimes shown with a ^

CTS Clear To Send (Serial I/O handshaking line)

CTT Commander's Tactical Terminal

CU CW brevity code: "See you"

CUAGN CW brevity code: "See you again"

CUBIC Common User Baseline for the Intel Community

CUCV commercial utility cargo vehicle

CUL CW brevity code: "See you later"

CUSEC Central U.S. Earthquake Consortium (HF net)

CV (1) USN Aircraft Carrier

(2) Vice Commander

CVBG Carrier Battle Group

CVDL Continuously Variable Delay Line

CVIC Carrier Intelligence Center

CVN US nuclear aircraft carrier

CW (1) Continuous Wave (usually Morse code)

(2) Clockwise (rotation)

(3) Composite Wing

CWDE Chemical Warfare Defense Ensemble

CWIS Campus-Wide Information System

CWISP Campus-Wide Information System Protocol

CWLU Crew Wireless LAN Unit

CWOC Composite Wing Operations Center

CWP Central West Pacific (MWARA)

CWS Combat Weather System

CWSS COP Web Services System

CYGNSS Cyclone Global Navigation Satellite System

CZ (Panama) Canal Zone (obsolete)

D (1) Down

(2) Diode

D/A Digital/Analog converter

D/L (1) Downlink

(2) Download

D2 Degrade and Destroy

D2C D-2 Small Cassette

D3 Degrade Disrupt Deny

D4 (1) Degrade Disrupt Deny Destroy

(2) Deny, Disrupt, Degrade, & Destroy

D4EN Degrade, Disrupt, Delay, Destroy, Exploit, or Neutralize

DA (1) Directional antenna

(2) Department of the Army

DA-2 Station changes directional pattern at night (FCC)

DAB Digital Audio Broadcasting

DAB+ Newer DAB standards, not backward compatible

DAC (1) Digital-to-Analog Converter

(2) Disaster Assistance Center (FEMA)

(3) Disaster Application Center

DACN (1) Department and Agency Continuity Network (FEMA)

(2) Direction de l'Aviation Civile Nord (North France aviation)

DACT Data Automated Control Terminal

DAE Disaster Assistance Employee

DAGS Data Architecture and Gateway Services

dah Morse code dash [~]

DAMA Demand Assigned Multiple Access (UHF SATCOM)

D-AMPS Digital Advanced Mobile Phone System

DAMSON Doppler And Multipath Sounding Network

DAQ Data Acquisition

DAQCS (1) Distress Alert Quality Control System

(2) Data Acquisition and Quality Control System

DARN (1) Dual Auroral Radar Network

(2) Disaster Amateur Radio Network, SoCal 440 MHz system

DARO Defense Airborne Reconnaissance Office

DARP Defense Airborne Reconnaissance Program

DARPA Defense Advanced Research Projects Agency

DARS Digital Audio Radio Service (US)

DARTS Dynamic Avionics Real-Time Scheduling

DAS (1) Data Aquisition System

(2) Distributed Antenna System

DASR Digital Airport Surveillance Radar

DAT Digital audio tape

D-ATIS (1) Digital Automated Terminal Information Service

(2) Digital Air Traffic Information Service (FAA)

DAWS Defense Automated Warning System

DB (1) Directional Beacon

(2) Dead body

dB Decibel (1/10 Bel, a logarithmic voltage or power ratio)

dBA Sound level (corrected to "A" scale dB)

dBc Decibels referenced to full-rated peak envelope power

DBCS Double byte character set

dBd Decibel gain over dipole antenna

dBi Decibel gain over (theoretical) isotropic antenna

dBic Db gain over circular isotropic

DBM (1) Doubly balanced mixer

(2) Data Block Message

dBm Decibels over 1 mW into 50 ohms, usually rf, 0 dBm = 0.316 Vp

DBMS Data Base Management System

DBPSK Differential Binary Phase-Shift Keying

DBS Direct broadcasting satellite/ system/ service

dBW Db over one watt

DC Direct Current

DC1 Device Control 1 (ASCII flow control)

DC2 Device Control 2 (ASCII)

DC3 Device Control 3 (ASCII flow control)

DC4 Device Control 4 (ASCII)

DCA (1) Defense Communications Agency (now DISA)

(2) Defensive counter Air

(3) Dual-Capable Aircraft

DCAC Defense Communications Agency Circular (now DISA)

DCCP Datagram Congestion Control Protocol

DCD Data Carrier Detect (packet modems)

DCDR Deputy Commander

DCE (1) Data Communication Equipment (like a modem)

(2) Distributed Computing Environment

DCFL Direct-Coupled Field-Effect Transistor Logic

DCG Deputy commanding general

DCI (1) Defensive Counter Information

(2) Director of Central Intelligence

DCID Director of Central Intelligence Directive

DCO Defense Coordinating Officer

DCOM Distributed Component Object Model (Windoze)

DCP (1) Data Collection Platform

(2) Defense Cryptologic Program

DCPA Defense Civil Preparedness Agency, now FEMA

DCR Direct Conversion Receiver ("Homodyne")

DCS (1) Defense Communications System

(2) Disaster Communications System, amateur, from RACES

(3) Digital Coded Squelch

(4) Distributed Control Systems

(5) Digital Communication System (also DCS-1800)

DCT (1) Digital Communications Terminal

(2) Direct Cosine Transform

DCTN Defense Commercial Telecommunications Network

DCW Digital Chart of the World

DD (1) Dual Diversity

(2) Digital Data

DDC Digital Down-Converter

DDD Maritime preamble for relayed distress message

DDDS Defense Data Dictionary System

DDM DoD Data Model

DDN Defense Data Network

DDNS Dynamic Domain Naming System/Server (Internet)

DDO Dynamic Drive Overlay (used by Disk Manager on the PC)

DDOS Distributed Denial Of Service (attack)

DDPO Defense Dissemination Program Office

DDR (1) Dual Diversity Receiver

(2) Double Data Rate (memory)

(3) Deutsche Demokratische Republik (1949-1990)

DDRR Direct Driven Ring Radiator (antenna)

DDRS Defense Data Repository System

DDS (1) Direct Digital Synthesis

(2) Defense Dissemination System

(3) Doctor of Dental Surgery

DDT (1) Delay/Denial Technology

(2) Dynamic Debugging Tool, named for old pesticide

DE Morse code prosign meaning "from"

DEA Drug Enforcement Administration (US)

DEC Digital Equipment Corporation, made some nice computers

DECCA Low-frequency CW phase comparison navigation (company name)

DECM Deceptive Electronic Countermeasures

DECnet DEC's name for networking protocols and products

DECT Digital European Cordless Telecommunications

DEFCON DEFense CONdition, 1-5; 5 is peace, 1 is global thermonuclear

war (STRATCOM)

DEMIZ DEW East Military Identification Zone

DEPCON Departure Control

DE-QPSK Differentially Encoded Quaternary Phase Shift Keying

DES Data Encryption Standard

DES-FED Stronger (108 bit) DES used by US government

DESC Defense Electronic Supply Center

Det Detector

DEW Distant Early Warning (old radar in Canada)

DF (1) Direction finding

(2) Direction finder ("duffer")

(3) Damping Factor

DFAD Digital Feature Analysis Data

DFAS Defense Finance and Accounting Service

DFB distributed feedback

DFCC Digital Flight Control Computer

DFCS Digital Flight Control System

DFCW Dual-Frequency Continuous Wave

DFD Digital Frequency Discriminator

D-FET Depletion-Mode Field-Effect Transistor

DFO Disaster Field Office

DFRC Dryden Flight Research Center (NASA)

DFT Discrete Fourier Transform

DGI Dirección General de Inteligencia, old name for Cuban DI

DGM Digital group multiplexer

DGPS Differential Global Positioning System

DGPS-MSK Differential GPS, Minimum Shift Keying

DGPS-QPSK DGPS-QPSK : Differential GPS, Quarternary Phase Shift

DGS Deployable Ground Stations

DHCP Dynamic Host Configuration Protocol

DHFCS Defence High-Frequency Communications System (UK)

DHS Department of Homeland Security (US)

DHTML Dynamic Hypertext Markup Language (web)

DI Dirección de Inteligencia, main Cuban intelligence agcy

DIA Defense Intelligence Agency

DIAC Defense Intelligence Analysis Center

DIAL Differential Absorption Lidar

DIAM Defense Intelligence Agency Manual

DICE Data Integration & Collection Environment

DIDOP Digital Image Data Output Product (Differential GPS, QPSK

DIG Domain Internet Groper

DIGEST Digital Geographic Information Exchange Standard

DIGI Digipeater, simplex digital repeater [~]

DIGTRX Digital transfer mode suite, now used only by Cuban intel

DII Defense Information Infrastructure

DIMM Double In-line Memory Module

DIMMS Double In-line Modular Memory System

DIN German standards agency

DIOP Data Input/Output Port

DIP Dual In-line Package (chips or small switches)

Diplo Diplomatic traffic, usually encrypted

DIPS Digital Image Processing System

DIRCM Directed Infrared Countermeasures

DIRMOBFOR Director of Mobility Forces

DIS (1) Defense Investigative Service

(2) Distributed Interactive Simulation

(3) Distributed Interactive System

(4) Draft International Standard

(5) Daily Intelligence Summary

(6) Data and Information System

(7) Defense Information System

(8) Defense Intelligence Service

DISA Defense Information Systems Agency

DISAC Defense Information Systems Agency Circular

DISC Packet control frame: Disconnect

DISCO Defense Industri+al Security Clearance Office

DISCOM Division support command

DISN Defense Information Systems Network

dit Morse code dot [~]

DITAW Detect, Identify, Track, Assesment, & Warn

DIW Dead in the water

DIWSA Digital Imagery Workstation Suite Afloat

DJ Deceptive Jamming

DJBDNS Daniel J. Bernstein DNS (more secure than BIND)

DL (1) Download

(2) Data Link

(3) Driver's License (police)

DLA Defense Logistics Agency

DLC Data Link Control

DLE Data Link Escape (ASCII)

DLL Dynamically Linked Library (computer programs)

DLRU Decoy Launch/Recovery Unit

DLMM Depot Level Maintenance Manual

DLQ Deck Landing Qualification

DLRP Data Link Reference Point, a USN authenticator

DM (1) Delay Modulation (Miller Coding)

(2) Packet control frame: Disconnect Mode (busy)

DMA (1) Direct Memory Access

(2) Defense Mapping Agency

DMAAC Defense Mapping Agency Aerospace Center

DMAHC Defense Mapping Agency Hydrographic Center

DMAHTC DMA Hydrographic Topographic Center

DMAL Defense Mapping Agency List

DMAT Disaster Medical Assistance Team

DMATC Defense Mapping Agency Topographic Center

DMB (1) Datum Marker Buoy

(2) Digital Multimedia Broadcasting (S-DMB=Satellite,

T-DMB=terrestrial)

DMB-T/H Digital Multimedia Broadcast-Terrestrial/Handheld (China)

DMC Defence Management Committee (Canada)

DMCA Digital Millennium Copyright Act

DMD Digital Micromirror Device

DME Distance Measuring Equipment (airport approach)

DMI Depot Maintenance Interservicing

DMR (1) Digital Mobile Radio (TDMA standard)

(2) Dual-Mode Resonators

DMSO Defense Modeling and Simulation Office

DMSP (1) Distributed Mail System Protocol

(2) Defense Meteorological Satellite Program

DMT Discrete Multi-Tone

DMTD Digital Message Transfer Device

DMTF Distributed Management Task Force

DMUX Demultiplexer

DMZ Demilitarized Zone (Korea)

DN (1) Dutch (Royal) Navy

(2) Directory Number (telco)

DNC Digital Nautical Chart

DNCC Deployed Network Control Center

DND Department of National Defence (Canada)

DNS Domain Naming System/Server (Internet)

DNSSEC DNS Security

DO design objective

DOA Dead On Arrival

DOB Date Of Birth (police)

DOC (1) Department of Commerce (US)

(2) Department Of Communication (Canadian "FCC")

DoD Department of Defense (US)

DoDD Department of Defense Directive

DoDIIS (1) Defense Intelligence Information System

(2) DOD Intelligence Information System

DoDISS (1) Department of Defense Index of Specifications and Standards

(2) DoD Index of Specifications and Standards

DoDSI Department of Defense Security Institute

DoDSSP DoD Single Stock Point

DOE Department Of Energy (US)

DOI Department Of the Interior (US)

DOJ Department Of Justice (US)

DOMS Director Of Military Support (MARS)

DOS (1) Department of State (US)

(2) Disk Operating System (generic)

(3) MS-DOS (old proprietary PC op-sys)

(4) PC-DOS, IBM version of above

(5) Denial of Service (attack)

DOT Department of Transportation (US)

DOW Doppler On Wheels (storm-chasing radar equipment)

DP (1) Development Prototype

(2) Dual Polarization

DPCA Displaced Phase Center Antenna

DPCM Differential Pulse Code Modulation

DPDT Double-Pole, Double Throw

DPG Defense Planning Guidance

DPI (1) Dots Per Inch

(2) Deep Packet Inspection (surveillance)

DPL Diode-Pumped Laser

dPMR Digital Private Mobile Radio

dPMR446 Digital Personal Mobile Radio on 446 MHz, European

DPQPSK Dual-Polarization Quadrature Phase Shift Keying

DPSK Differential Phase-Shift Keying

DPST Double-Pole, Single-Throw

dpx Duplex

DQPSK Differential Quadrature Phase-Shift Keying

DR low drifting

DRAC Dynamic Relay Authorisation Control

DRAM Dynamic Random Access Memory

DRASH Deployable Rapid Assembly SHelter

DRE Drug Recognition Expert

DRFM Digital Radio Frequency Memory

DRFMU Digital Radio Frequency Memory Unit

DRM (1) Digital Radio Mondiale

(2) Digital Rights Management

DRO Dielectric Resonator Oscillator

DRS Deployable Red Switch

DRRS Digital Radio Relay System

DRSN Defense RED Switch Network

DS (1) Direct Sequence

(2) Direct Support

(3) Dust Storm

DSA Division support area

DSAC Direction de la sécurité de l'Aviation civile (French airline security)

DSA/SMC Deputy for Systems Acquisition/Systems Management Center

DSB Double sideband

DSC Digital Selective Calling (GMDSS)

DSI Defensive Simulation Internet

DSL Digital Subscriber Line

DSLAM Digital Subscriber Line Access Multiplexer

DSM (1) Digital Switching Module

(2) Distributed Shared Memory

DSN (1) Defense Switched Network (old AUTOVON)

(2) Deep Space Network (NASA)

DSNET Defense Secure Network

DSNT distant

DSO Digital Storage Oscilloscope

DSOR Depot Source of Repair

DSP Digital signal processing

DSR Data Set Ready (Serial I/O primary handshaking line)

DSRC Dedicated Short Range Communications

DSS (1) Digital Satellite System

(2) Diplomatic Security Service

DSSS Direct-Sequence Spread Spectrum

Dst Disturbance Storm Time, equatorial magnetospheric activity index

D-STAR Digital Smart Technology for Amateur Radio

DSTO Defence Science & Technology Organisation (Australia)

DSVD Digital Simultaneous Voice and Data

DSVT Digital Subscriber Voice Terminal

DSW Russian CW brevity code: "Daswedanya" (Goodbye)

DT District T (USCG)

DTAC Division tactical command post

DTC Design to Cost

DTCS (1) Distributed Tactical Communications System

(2) Domestic Transmission Capacity Service (Australia)

DTD Data Transfer Device

DTE Data Terminal Equipment (computers, workstations, dumb terminals)

DTED Digital Terrain Elevation Data

DTG Date time group (example: ddhhmm mon yy z)

DTIM Delivery Traffic Indication Message

DTM (1) Data Text Message

(2) Data Transfer Module

(3) Digital Technology Model

DTMB Digital Terrestrial Multimedia Broadcast (Chinese TV, nee DMB-T/H)

DTMF Dual Tone Multi Frequency (like telco "touch tone")

DTMF-RA Dual Tone Multi-Frequency - Remote Access

DTO Division tactical operations center

DTOP Digital Topographic Data

DTR Data Terminal Ready (Serial I/O primary handshaking line)

DTS (1) Digital Transmission System (Euro radio e-mail s/w)

(2) Data Terminal Set

(3) Digital Terrain System

(4) Defense Travel System

(5) Dedicated To Sound

(6) Dispatcher Training System (power company)

(7) Diplomatic Telecommunications Service (US DoS)

DTSS Digital Terrain Support System

DTT Digital Terrestrial Television

DTV Digital Television

DTV-T European digital television standard

DTX Discontinuous Transmission

DU (1) widespread dust (weather)

(2) depleted uranium

DUATS Direct User Access Terminal System

DUP-ARQ Hungarian diplomatic teleprinting system

DUPE CW prosign: message or contact is a duplicate

DUSD Deputy Undersecretary of Defense

DUT Device Under Test

DUT1 UTC correction interval to get UT1

DV (1) Distinguished Visitor

(2) Digital Voice

DVA Department of Veterans Affairs

DVB Digital Video Broadcast (Europe)

DVB-C Digital Video Broadcast (cable)

DVB-H Digital Video Broadcast (handheld)

DVB-S Digital Video Broadcast (satellite)

DVB-SH Digital Video Broadcast (satellite handheld)

DVB-T Digital Video Broadcast (terrestrial)

DVD Digital Versatile Disk

DVE

DVFR Defense Visual Flight Rules

DVI Digital Video Interface

DVM Digital Voltmeter

DVMT Dynamic Video Memory Technology

DVP (1) Distinguished Visitor Protocol (US Air Force

(2) Digital Voice Protection (secure voice)

DVSI Digital Voice Systems, Inc.

DW Deutsche Welle

DWC Digital Wireless Communications

DX (1) Distant Transmitter. The distance can be either geographic or

psychological.

(2) First transmission of FEC character

(3) Duplex

DXAC DX Advisory Committee (ARRL)

DXCC DX Century Club (ARRL award)

DXing The hobby of listening to distant radio or television

DXpedition Portable operation in rarely heard DXCC entities

DZ (1) Drop zone

(2) drizzle

DZST Drop Zone Support Team

E (1) Electromotive force (in volts)

(2) east, ended

(3) E-region (middle zone of ionosphere)

(4) Electric field

E2K Enigma 2000, numbers listening group

EA (1) East Asia (MWARA)

(2) Electronic Attack

EAC Echelons above corps

EAD Echelons above division

EAF Expeditionary Airfields

EALS Emergency Airfield Lighting System

EAM Emergency Action Message

EAP Extensible Authentication Protocol

EAR End Air Refueling

EARN European Academic and Research Network