Technology Glossary


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  • TELEPHONY
    The word used to describe the science of transmitting voice over a telecommunications network.
  • TELEPHONY
    The word used to describe the science of transmitting voice over a telecommunications network.
  • Telephony
    The word used to describe the science of transmitting voice over a telecommunications network.
  • Teletext
    Textual and graphic information broadcast in the vertical blanking interval between conventional video frames in television signals. It requires a...
  • Teletypewriter Exchange Service TWX
    A dial-up worldwide telegraph service (similar to telex, but operating at different transmission speeds, and with a different code) used...
  • Television Receive Only Earth Station TVRO
    Earth station equipment that receives video signals from satellite or MDS-type transmissions. Such stations have only receiving capability and need...
  • Telex Service
    A public switched service in which teletypewriter stations are provided with lines to a central office for access to other...
  • TEMP
    Temperature
  • temperature
    It is a measure of the kinetic energy of the molecules and shows how the heat of the air.
  • Temperature Rating
    The maximum temperature at which an insulating material may be used in continuous operation without loss of its basic...
  • temporal
    Pertaining to, concerned with, or limited by time.
  • temporal resolution
    the revisit time of a satellite over a given geographic location. The revisit time for Landsat 4, 5, and 7...
  • Tensile Strength
    The pull stress required to break a given specimen.
  • Terminal Node Controller TNC
    A device that converts and controls the radio transmission and reception of digital signals from a computer.
  • Termination point
    the point where a communication line enters into a building.
  • Text Telephone TT
    A machine that employs graphic communication in the transmission of coded signals through a wire or radio communication system. TT...
  • TFM
    Traffic Flow Management
  • TGT
    Target
  • THDG
    True Heading
  • Thematic Mapper TM
    One of the two Earth-sensing payloads carried aboard Landsat 4 and 5, the Multispectral Scanner being the other on 4...
  • thermal band
    A general term for intermediate and long wavelength infrared-emitted radiation, as contrasted to short wavelength reflected (solar) infrared radiation. In...
  • thermal infrared
    The preferred term for the middle wavelength ranges of the infrared region extending roughly from 3
  • thermocouple
    A pair of wires made of two dissimilar metals, joined at one end, across which a DC voltage is produced...
  • Thin Client
    A network computer without a hard disk drive, which, in client/server applications, is designed to be especially small so that...
  • THR
    Thrust
  • THR HOLD
    Throttle Hold
  • threshold
    The boundary in spectral space beyond which a data point, or pixel, has such a low probability of inclusion in...
  • thrust
    A force created by the engines to push an airplane through the air.
  • thrust
    specific fuel consumption - The fuel that the engine must burn per hour to generate 1 LB of thrust.
  • thrust reverser
    A device used to partially reverse the flow of the engine's nozzle discharge gases and thus create a thrust force...
  • TI
    Texas International
  • TIA EIA
    Telecommunications Industry Association/Electronics Industry Association. An organization that sets telecommunications standards for buildings, cables, and connectors. Also sets practices and...
  • TIAS
    True Indicated Airspeed
  • Tier
    Levels of cable television service providing selected channels.
  • Tight Buffered
    A type of fiber optic communication cable where the fiber strands are tightly wrapped by the covering sheath.
  • Time Division Multiple Access TDMA and Code Division Multiple Acess CDMA
    These terms are used to describe multiple access systems. For example, CDMA is a method of spreading spectrum transmission for...
  • time Greenwich mean
    Mean solar time of the meridian of Greenwich, England (known as the prime meridian, longitude 0
  • time mean Sun
    The mean Sun time at a given location on the Earth is determined by the distance in longitude from the...
  • Tinned Copper
    Tin coating added to copper to aid in soldering and inhibit corrosion.
  • Titles
    The identification of all people featured in a packaged story will be included in the slate at the head of...
  • TKE
    TrackAngle Error
  • TM
    Thematic Mapper
  • TMA
    Traffic Management Advisor
  • TMC
    Thrust Management Computer
  • TMF
    Thrust Management Function
  • TMU
    Traffic Management Unit
  • TN
    True North
  • TO EPR
    Takeoff Engine Pressure Ratio
  • TO Nl
    Takeoff Engine Fan Speed
  • TOD
    Top of Descent
  • TOGA
    Takeoff/Go-Around
  • tone
    Each distinguishable variation of shade from black to white.
  • Topology
    the geometric configuration of a computer network, or how the network is physically laid out. Common topologies are star (centralized),...
  • torque
    A force, multiplied by its lever arm, rotating at right angles to an axis.
  • TOT
    Total
  • Touch Screen
    Input device over the television or a special computer screen that is used to simplify user input and response. The...
  • TRA
    Thrust Reduction Altitude
  • Tracking and Data Relay Satellite System TDRSS
    A system of geosynchronous communication satellites launched for the purpose of receiving and relaying data, command, and telemetry signals to...
  • TRACON
    Terminal Radar Approach Control Facility.
  • TRANS
    Transition
  • transformation
    (1) The process of projecting an image (mathematically or graphically) from its plane onto another plane by translation, rotation, and/or...
  • transient mode
    Conditions that may occur briefly while accelerating or deceleration, or while passing through a specific range of engine operation. A...
  • Translator
    A television or FM broadcast station, operating at relatively low power, that receives a corresponding television or FM signal on...
  • transmittance
    The ratio of the energy per unit time per unit area (radiant power density) transmitted through an object to the...
  • transonic
    350 to 750 MPH. This speed category is the most common one used for commercial jets.
  • Transponder
    The electronic equipment on a satellite that receives signals from an uplink, converts signals to a new frequency, amplifies the...
  • Transponder
    The device in a communications satellite that receives signals from the earth, translates and amplifies them on another frequency, and...
  • Tray
    A unit or assembly of units or sections, and associated fittings, made of metal or other noncombustible materials forming a...
  • TRK
    Track (to a NAVAID)
  • TRT
    Total Running Time means the length of the edited package
  • TRU
    TRUE
  • truncate
    To shorten by or as if by cutting off.
  • Trunk
    Trunk Line. A communication link running between telephone company central offices. Also a communication link that connects a customer location...
  • TSRV
    Transport Systems Research Facility
  • TT
    Total Temperature
  • TTY
    A type of machine that allows people with hearing or speech disabilities to communicate over the phone using a keyboard...
  • TTY
    A type of machine that allows people with hearing or speech disabilities to communicate over the phone using a keyboard...
  • TTY
    An abbreviation for teletypewriter. Machinery or equipment that employs interactive text based communications through the transmission of coded signals across...
  • TURB
    Turbulence
  • turbine
    The high energy airflow coming out of the combustor goes into the turbine, causing the turbine blades to rotate. This...
  • Twisted Pair
    Pair of copper wires wrapped around each other.
  • Twisted Pair
    This is the term used to describe the traditional copper cable that is used for short distance communications.
  • Two way Cable TV Capability
    Interactive services offered by cable systems, for example, home shopping, banking and polling services.
  • Two Way Video Two Way Audio
    Interactive video in which all sites are in visual contact with one another. Some form of audioconferencing is used for...
  • Type Acceptance
    an equipment authorization issued by the FCC based on test data submitted by the applicant for equipment to be used...
  • UA
    United
  • UHF
    Ultra-high Frequency
  • UL
    Abbreviation for Underwriters Laboratories, a nonprofit independent organization, which operates a testing and listing service for electrical and electronic materials...
  • Ultra High Frequency UHF
    Radio frequencies in the band from 300 to 3,000 MHz.
  • Ultra High Frequency UHF
    The part of the radio spectrum from 300 to 3000 megahertz that includes TV channels 14-83, as well as many...
  • ultraviolet radiation
    Electromagnetic radiation of shorter wavelength than visible radiation but longer than X-rays; roughly, radiation in the wavelength interval between 10...
  • umbra
    The complete or perfect shadow of an opaque body, as a planet, where the light from the source of illumination...
  • UNBUNDLING
    The term used to describe the access provided by local exchange carriers so that other service providers can buy or...
  • UNBUNDLING
    The term used to describe the access provided by local exchange carriers so that other service providers can buy or...
  • Unbundling
    Unbundling is the term used to describe the access provided by local exchange carriers so that other service providers may...
  • uncontrolled mosaic
    A mosaic made without correction for distortion or displacement of any type.
  • Undue burden
    Undue burden means significant difficulty or expense. In determining whether an action would result in an undue burden, an agency...
  • uniform grid
    Square, rectangular, or, more rarely, hexagonal lattice for recording geographical data, The simpler grids are usually not related to geodetic...
  • Uniformed Resource Locator URL
    The standard way to give the address of any resource that is on the Internet and is part of the...
  • Universal Resource Locator URL
    A World Wide Web address composed of several parts including the protocol, the server where the "resource" (e.g., web page)...

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