D

	DA Destination Address
	DA Directory Assistance
	DAB Digital Audio Broadcast Broadcasting digital audio signals via WEB, networks, cable, satellite or fibre optic
	DAC Digital Analogue Converter Converts digital signals to analogue
	DAC Dual Attached Concentrator
	DAC Device Access Code
	DAC Discretionary Access Control A means of restricting access to objects based on the identity of subjects or groups to which they belong or on the possession of an authorisation granting access to those objects.
	DAEMON Disc And Execution MONitor
	DAFS Direct Access File System A protocol for direct memory to memory data transfer between devices and applications in datacentre environments
	DALS Dedicated Access LineS
	DAP Directory Access Protocol Used in X.500
	DAS Dual Attachment Station
	DAS Direct Attached Storage Traditional data storage model pre-networks
	DASD Direct Access Storage Device A term often used in the mainframe environment for disk drive.
	DAT Digital Audio Tape A digital recording technology that uses a helical scan read/write head and x-mm magnetic tape.
	DAVIC Digital Audio VIsual Council
	DB DeciBel
	DBMS Database Management System A collection of programs that allow you to store, modify and extract information from a database
	DBS Direct Broadcast Satellite
	DC Direct Current
	DC Directional Coupler
	DCA Data Communications Architecture
	DCC Digital Compact Cassette A format that improves the quality of sound over that of a conventional analogue player.
	DCC Data Country Code
	DCC Data Communications Channel
	DCE Data Communications Equipment
	DCF Data Composition Facilities
	DCI Display Control Interface A windows component used for graphics
	DCI Default Check Initialization
	DCOM Distributed Component Object Model
	DDE Direct Data Entry Old term for a input device, commonly a dumb terminal
	DDE Dynamic Data Exchange
	DDI Direct Draw Interface A windows component used for graphics
	DDR Dial on Demand Routing
	DDR Double Data Rate memory
	DDS Digital Data Service
	DE Data Element
	DECT Digital Enhanced Cordless Telecommunications
	DEK Data Encryption Key
	DEN Directory Enabled Network
	DES Data Encryption Standard

An encryption block cipher defined and endorsed by the U.S. government in 1977 as an official standard

	DF Dedicated File
	DFB Distributed FeedBack
	DFS Distributed File System
	DH Data High rate Packet type for high rate data
	DHCP Dynamic Host Configuration Protocol A protocol for assigning IP addresses to devices on a network. This means that a new computer can be added to a network without the need to manually assign a new unique IP address.
	DHTML Dynamic HyperText Markup Language
	DIAC Dedicated Inquiry Access Code
	DID Direct Inward Dial
	DIMM Dual Inline Memory Module
	DIN Deutsche Industrie Norm Connector
	DIP Dual In-line Pin
	DIP Dial up Internet Protocol
	DIR DIRectory file
	DIT Directory Information Tree X.500
	DLC Digital Loop Carrier
	DLC Data Link Control
	DLCI Data Link Connection Identifier
	DLL Dynamic Link Library Subroutines used and shared by programs and applications
	DLP Digital Light Processing
	DLT Digital Linear Tape A technology for storing 10Gb or more of data on individual mini cartridges of half-inch tape.
	DM Data Mining A buzz word for a class of data applications that search for hidden patterns in groups of data. E.g. DM software can help retail companies find customers with common interests.
	DM Data Medium rate Packet type for medium rate data
	DMA Direct Memory Access A technique for transferring data from main memory to a device without passing through the CPU.
	DMD Digital Micro Device
	DMR Digital Multimedia Recorder Capable of reading and writing to most formats including CD, DVD, TV and cable.
	DMS Digital Multiplex Systems
	DMT Discrete MultiTone
	DMTF Distributed Management Task Force
	DMZ De Militarized Zone Firewall protected area
	DN Distinguished Name X.500
	DNA Digital Network Architecture Enables Windows and the Internet to work together.
	DNIS Dial Number Identification Service
	DNS Domain Name System / Service An internet service that translates alphabetic domain names into IP addresses.
	DO Data Object
	DOCSIS Data Over Cable Service Interface Specification
	DOCSS Data Over Cable Security System
	DOD Direct Outward Dial
	DOI Digital Object Identifier Similar to a URL but utilising a prefix and suffix
	DOS Disk Operating System An operating system that resides on a fixed disc to enable consistency of data.
	DoS Denial of Service The prevention of authorised access to resources or the delaying of time-critical operations.
	DPI Dots Per Inch Measurement generally associated with print. The greater the DPI the clearer the print
	DPMS Display Power Management Signalling CMOS function used in power management of displays
	DPN Data Packet Network
	DPOF Digital Print Order Format
	DQDB Distributed Queue Dual Bus
	DR Dynamic Range
	DR Direct Request
	DRAM Dynamic Random Access Memory Popular type of memory
	DRDRAM Direct Rambus Dynamic Random Access Memory
	DS Digital Signal
	DSA Directory System Agent
	DSA Digital Signature Algorithm The algorithm used in creating the digital signature for a given message or transaction.
	DSAP Destination Service Access Point
	DSBSC Double SideBand Suppressed Carrier
	DSE Data Switching Exchange
	DSI Digital Speech Interpretation
	DSL Digital Subscriber Line Capable of transmitting data many times faster than the current speed of conventional telephone systems.

DSIMM

Dual Single In-line Memory Module

DSL

Digital Subscriber Line

DSLAM

Digital Subscriber Loop Access Multiplexer

	DSM Digital Storage Media
	DSN Data Source Name
	DSP Digital Signal Processing Usually used to provide sound and video capabilities to computers
	DSPU Down Stream Physical Unit
	DSR Data Set Ready Modem
	DSS Directory and Security Services
	DSU Digital Services Unit Used in synchronous connection to the internet instead of conventional Modems.
	DSX Digital Signal CROSS connect
	DTC Decoder Time Clock
	DTE Data Terminal Equipment Device at the end point of communications
	DTH Direct To Home Term used to describe the method of delivery of information into fixed receivers
	DTMF Dual Tone Multi Frequency
	DTP Desk Top Publishing Applications that allow the end user to format text and graphics to simulate a publication.
	DTR Data Terminal Ready Modem
	DTS Decoding Time Stamp
	DTT Digital Terrestrial Television
	DUKPT Derived Unique Key Per Transaction An American transaction key scheme standard.
	DUT Device Under Test
	DV Data Voice
	DVB Digital Video Broadcast
	DVCR Digital Video Cassette Recorder
	DVD Digital Versatile Disc. Similar to the CD ROM, the CD-DVD is the new medium for storing and displaying video and sound

DVDR

Digital Versatile Disc Recordable

DVI

Digital Video Interface

DVMRP

Distance Vector Multicast Routing Protocol

DVR

Digital Video Recorder

DWDM

Dense Wavelength Division Multiplexing

Helps carriers to squeeze vast amounts of data through the same amount of fibre

DWS

Dialable Wideband Service

DXI

Data eXchange Interface