Technology Glossary : D


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  • D
    Derated
  • D D
    Drift Down
  • D TO Nl
    Derated Takeoff Engine Fan Speed
  • DA
    Descent Advisor
  • DADC
    Digital Air Data Computer
  • Dark Fiber
    Optical fiber installed without a transmitter or receiver. These fibers are the un-used fibers in a cable. Some fibers are...
  • data compression
    Any technique that condenses the available data so as to make data storage or transmission more efficient. Data compression can...
  • Data Link
    A data communications connection between two points.
  • Data Link Layer
    Layer 2 of the OSI reference model. This layer takes data from the network layer and passes it on to...
  • Database software
    a computer program that allows the storage of large amounts of information and give the capacity to search, retrieve, sort,...
  • DATALINK
    Digitized Information Transfer (air/ground)
  • dBm
    Decibels below 1 mW (milliwatt)
  • DBS
    Direct Broadcast Satellite.
  • DBS
    Direct Broadcast Satellite
  • dBu
    Decibels below 1
  • DC
    Direct Current Electricity
  • DCE
    Data Communications Equipment. Any equipment that connects to Data Terminal Equipment (DTE) to allow data transmission between DTEs. A modem...
  • DDS
    Digital Direct Satellite.
  • DE TO PR
    Derated Takeoff Engine Pressure Ratio
  • DEC
    December
  • DEC
    Digital Equipment Corporation
  • Decibel dB
    A unit to express differences of power level. Used to express power gain in amplifiers or power loss in passive...
  • Decoder EAS
    an electronic device used by EAS participants to receive EAS alerts.
  • Decoder Two Tone
    an electronic device that alerts operators to the reception of the two-tone signal.
  • decompression
    A reversal of the process of data compression.
  • DECR
    Decrement
  • Dedicated Line
    A communications circuit or channel provided for the exclusive use of a particular subscriber. Dedicated lines are used for computers...
  • DEL
    Delete
  • density
    mass per unit volume. Engine thrust depends on density of the air: the higher the density, the more thrust.
  • density slicing
    A general class of electronic or digital techniques used to assign linage points or data vectors to particular classes based...
  • DEP
    Departure
  • DES
    Descent
  • Descrambler
    An electronic circuit that restores an intentionally scrambled video signal to its original standard form.
  • Desktop Publishing
    Software programs that enable the user to use a microcomputer and a laser or color printer to produce relatively high-quality...
  • Desktop Videoconferencing
    Videoconferencing on a personal computer equipped with a fast Internet connection (at least 28.8 Kbps modem), a microphone, and a...
  • DEST
    Destination
  • detector responsivity
    The radiometric response of an electronic detector that converts photons into voltage or current. Detector responsivity includes the end-to-end optical...
  • DEV
    Deviation
  • DFCB
    Data Format Control Book
  • DFDAU
    Digital Flight Data Acquisition Unit
  • DFDR
    Digital Flight Data Recorder
  • DFGS C
    Digital Flight Guidance System/Computer
  • DFW
    Dallas Fort Worth International Airport
  • DGPS
    Differential GPS
  • DH
    Decision Height
  • DIAL AROUND
    Long distance services that require consumers to dial a long-distance provider
  • DIAL AROUND
    Long distance services that require consumers to dial a long-distance provider
  • Dial It Service
    A telecommunications service that permits simultaneous calling by a large number of callers to a single telephone number. There is...
  • Dial Up Services
    A dial-up service is a method of connection to the Internet through a modem and a traditional telephone line. Dial-up...
  • Dielectric
    Nonconductive material
  • Dielectric Strength
    The voltage which an insulation can withstand before breakdown occurs. Usually expressed as a voltage gradient (such as volts per...
  • diffuser
    air intake methods, in a variety of shapes to create different effects on the intake of the air.
  • Digital
    An encoded signal. Normally encoded in discrete levels to represent a binary signal of ones and zeros.
  • digital
    Representation of data in the form of discrete bits, or equal integral units. Contrast to analog.
  • Digital Audio Broadcasting DAB
    Radio broadcasting using digital modulation and digital source coding techniques.
  • Digital certificate
    an attachment to an electronic message that allows the recipient to authenticate the identity of the sender via third party...
  • Digital Communication
    A communications format used with both electronic and light-based space systems that transmits audio, video, and data as bits ("1s"...
  • Digital Digitized
    Any type of information that can be out-put, transmitted and interpreted as individual bits of binary information (the use of...
  • digital image
    A digital image, or digitized image, or digital picture function of an image, is an image represented numerically in digital...
  • Digital Subscriber Line
    DSL. A service that transmits digital signals (to homes and small offices) via the existing copper wire used for voice...
  • Digital Subscriber Line DSL
    A high-bandwidth technology for connecting to the Internet using the copper telephone lines that exist in almost every home and...
  • DIGITAL TELEVISION DTV
    A new technology for transmitting and receiving broadcast television signals. DTV provides clearer resolution and improved sound quality.
  • DIGITAL TELEVISION DTV
    A new technology for transmitting and receiving broadcast television signals. DTV provides clearer resolution and improved sound quality.
  • DIR
    Direct
  • DIR INTC
    Direct Intercept
  • Direct Broadcast Satellite DBS
    a service intended to deliver satellite signals directly to consumers using small, relatively inexpensive receiver stations.
  • DIRECT BROADCAST SATELLITE DBS DISH
    A high-powered satellite that transmits or retransmits signals which are intended for direct reception by the public. The signal is...
  • DIRECT BROADCAST SATELLITE DBS DISH
    A high-powered satellite that transmits or retransmits signals which are intended for direct reception by the public. The signal is...
  • Direct Broadcast Satellite DBS DISH
    A high-powered satellite that transmits or retransmits signals which are intended for direct reception by the public. The signal is...
  • Direct Burial Cable
    A cable installed directly in the earth.
  • Direct Current DC
    An electric current which flows in only one direction.
  • DIS
    Distance
  • DISCR
    Discrepancy
  • Dish
    An earthbound dish-shaped antenna used for receiving satellite signals. Also referred to as downlink dish and ground receiving dish.
  • Disk
    a round plastic magnetic device on which computer programs and data are saved. There are three main types of disks:...
  • Disk drive
    a device that reads the information contained on a disk. The drive may be permanently installed inside the computer (hard...
  • Diskette
    a thin, plastic flexible disk on which computer programs and data can be saved outside of the computer. The two...
  • DIST
    Distance
  • Distance Communication
    Use of telecommunication technology for the implementation of administrative activities such as meetings, focus group, or job interviews when the...
  • Distance Education
    See Distance Learning. The term distance education is often used synonymously with distance learning. However, distance education typically refers to...
  • Distance Learning
    A system and a process that connects learners with distributed learning resources. While distance learning takes a wide variety of...
  • Distant Signal
    A television channel from another market imported and carried locally by a cable television system.
  • distortion
    A change in scale from one part of an image to another.
  • Distributor
    A person/company that distributes signals from a satellite carrier and provides that transmission either directly to individual subscribers for private...
  • DL
    Delta
  • DLP
    Data Link Processor (the FAA's ground automation system that supports the Mode S subnetwork (GDLP), internetwork (ATN router) and non-ATC...
  • DLR
    German Aerospace Research Establishment
  • DME
    Distance Measuring Equipment (ground navigational aid that can provide display of distance to selected ground navigational radio transmitter)
  • DMU
    Data Management Unit
  • DN
    digital number
  • DNTKFX
    DownTrack Fix
  • Docket Number FCC term
    A number assigned to a proceeding opened by the issuance of either a Notice of Pro-posed Rule Making or a...
  • DOD
    Department of Defense
  • Domain Name
    Used in URLs to identify particular web pages or sites located on the Internet. For example, the domain name nces.ed.gov...
  • DOT
    Department of Transportation
  • Downlink
    The part of a satellite system that includes the satellite itself, the receiving earth station and the signal transmitted from...
  • Download Receive
    To receive data from another computer into your computer. It is also called "receive." The opposite is called "Upload."
  • Downloading
    the process of transferring information from a remote computer to yours.
  • Downloading
    A procedure for transferring or retrieving a file from a distant computer. Opposite of uploading. Many Web sites have links...
  • drag
    The force that resists the motion of the aircraft through the air.

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