Technology Glossary : C


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  • C
    Centigrade
  • C band
    A type of satellite transmission with less path loss than other satellite standards such as Ku-band. C-band, however, requires a...
  • CAA
    Civil Aviation Authority (Great Britain)
  • CAAC
    Civil Aviation Authority of China
  • CAB
    Civil Aeronautics Board
  • Cable
    A group of individually insulated conductors in twisted or parallel configuration, with an overall outer jacket.
  • Cable Converter Box
    Equipment often provided by a cable company in a subscriber
  • Cable Modem
    A modem (q.v.) designed to operate over cable-TV lines rather than phone lines.
  • Cable Signal Leakage
    Excessive levels of radio frequency (RF) energy that leak from cable television systems. Leak can cause interference to com-munications users,...
  • Cable Television Relay Service CARS
    The relaying of television, FM radio, cablecasting and other signals on a micro-wave frequency band to a terminal for distribution...
  • Cable Television Transmission
    The transmission, usually for a fee, of television signals, including signals that originate at over-the-air television stations, to consumers on...
  • Cables
    the collections of wires twined together to connect peripherals to the computer system unit.
  • Cache
    an area of disk space which stores the text and graphics of a viewed web page. When the web page...
  • Cache
    Memory that holds copies of recently accessed data. Several Web browsers keep recently viewed pages in a cache so users...
  • calibration
    The adjustment or systematic standardization of the output of a quantitative measuring instrument or sensor.
  • calibration data
    In remote sensing, measurements pertaining to the spectral or geometric characteristics of a sensor or radiation source. Calibration data are...
  • calibration lamps
    Lamps carried into orbit on imaging sensors for the purpose of measuring the responsivity of reflective band detectors as a...
  • calibration parameter file
    Computer files of fixed parameters used in the ground processing system to convert raw uncalibrated bits from a spacecraft imager...
  • California Law Enforcement Radio System
    A statewide, microwave-linked, VHF and UHF point-to-point radio system with 22 mountaintop transmitters in California, Nevada and Oregon. The CLERS...
  • Call Sign
    Each Amateur Radio station is assigned a call sign by the government of that country which allows the operator to...
  • CALLING CARD
    A telecommunications credit card with an authorization code for using a long distance carrier when the customer is away from...
  • CALLING PARTY PAYS
    A billing method in which a wireless phone caller pays only for making calls and not for receiving them. The...
  • CALLING PARTY PAYS
    A billing method in which a wireless phone caller pays only for making calls and not for receiving them. The...
  • can annular chamber
    This type was a combination of the can and annular type chambers. A number of flame tubes are fitted inside...
  • can type chamber
    Chambers are arranged around the engine and the air is delivered into ducts in each chamber. Each chamber has an...
  • CARRIER
    Originally a long distance company that leases facilities to carry a call; the term is now used to describe companies...
  • Carrier Hotel
    A large building where communication carriers place equipment to provide connections between their respective systems.
  • Carrier Sense
    Carrier Sense is the process used by devices on Ethernet to determine whether the cable is currently being used by...
  • CAS
    Calibrated (Computed) Air Speed
  • Cascading Style Sheets CSS
    are used to design web pages. They are web pages derived from multiple sources with a defined order of precedence...
  • CASE
    Computer Aided Software Engineering
  • CAT
    Clear Air Turbulence
  • CAT
    Computer Aided Testing
  • CAT I
    Facility providing operation down to 200 feet decision height and runway visual range not less than 2600 feet.
  • CAT II
    Facility providing operation down to 100 feet decision height and runway visual range not less than 1200 feet.
  • CAT II a
    Facility providing operation with no decision height limit to and along the surface of the runway with external visual reference...
  • Category 5
    Commonly referred to as "Cat 5". A type of twisted pair copper cable that meets standards for transmitting high speed...
  • CATV
    An acronym for Community Antenna Television.
  • CBT
    Computer Based Training
  • CCITT
    International Consultative Commission on Telephone and Telegraph, an arm of the ITU (International Telecommunications Union) a standards setting body.
  • CCTV
    Closed Circuit Television.
  • CD ROM compact disc read only memory
    a round silver colored plastic disk that comes with massive amounts of information embedded and ready to be used. Unlike...
  • CDI
    Course Deviation Indicator
  • CDTI
    Cockpit Display of Traffic Information
  • CDU
    Control display unit (pilots' interface to the FMS)
  • cell
    In remote sensing, an area on the ground from which electromagnetic radiation is emitted or reflected. See instantaneous field of...
  • Cellular Mobile Radio Telephone System
    Also called "Cellular." A high capacity land mobile telephone system wherein channels assigned to the system are divided among several...
  • CELLULAR TECHNOLOGY
    This term, often used for all wireless phones regardless of the technology they use, derives from cellular base stations that...
  • CELLULAR TECHNOLOGY
    This term, often used for all wireless phones regardless of the technology they use, derives from cellular base stations that...
  • Cellular Wireless
    A method of connection to the Internet that does not use any ground lines. The existing standard protocol is relatively...
  • CENA
    Centred'
  • Central Office
    Commonly referred to as a "CO." A telephone company facility for switching signals among local telephone circuits. Also called a...
  • CENTRAL OFFICE
    A facility of a telecommunications carrier where calls are switched.
  • Central Processing Unit CPU
    The brain of the computer. Two components found in the CPU are the arithmetic logic unit, which performs calculations and...
  • Central processing unit CPU
    the brain of the computer that processes instructions and manages the flow of information through a computer system.
  • centrifugal flow compressor
    The direction of the flow of compressed air discharges outward at 90
  • Centrifugal flow turbojet
    A turbojet engine with a centrifugal compressor rather than an axial flow compressor.
  • centrifugal force
    The outward force an object exerts on a restraining agent when the motion of the object is rotational.
  • centripetal force
    The inward force a restraining agent exerts on a an object moving in a circle. It is equal to, but...
  • Certificate of Compliance C of C
    A certificate showing that the product being shipped meets customer's specifications.
  • Certification
    an equipment authorization issued by the FCC based on representations and test data submitted by the applicant for equipment designated...
  • CERTIFIED TELECOMMUNICATIONS PROVIDER
    An entity certified by the Department of Public Utility Control to provide intrastate telecommunications services, as defined in
  • Certified Test Report CTR
    A report providing actual test data on a cable. Tests are normally run by a Quality Control Department, which shows...
  • CFIT
    Controlled Flight Into Terrain
  • CG
    Center of Gravity
  • CGI
    the Common Gateway Interface, How a web server runs a script or program and sends the output to a web...
  • CGS
    Centimeter-gram-second
  • Channel
    All AETN packages will have two audio channels. Channel One will include the VO and nat sound; Channel Two will...
  • Chat
    Two or more individuals connected to Internet have real-time text-based conversations by typing messages into their computer. Groups gather to...
  • Churn
    The term used to describe turnover rate of subscribers to a service or product.
  • CI
    China Airlines
  • CIRCUIT
    A switched or dedicated communications path with a specified bandwidth (transmission speed/capacity).
  • Circuit
    A two-way communications path. Circulation (FCC term) an FCC term, circulation is the procedure whereby items are routed to Commission-ers...
  • CIT
    Compressor Inlet Temperature
  • Cl
    Cost Index
  • Class D FM station
    a station whose output power is 10 watts or less.
  • CLB
    Climb Detent of the Thrust Levers
  • Clear Channel
    A clear channel protects stations designated as Class A stations from objectionable interference within their primary and secondary service areas....
  • CLEC
    Competitive Local Exchange Carrier
  • Client server network
    a configuration where all people store their files on a central computer, and files are accessed directly from where they...
  • CLOSED CAPTIONING
    A service for persons with hearing disabilities that translates television program dialog into written words on the television screen.
  • CLOSED CAPTIONING
    A service for persons with hearing disabilities that translates television program dialog into written words on the television screen.
  • Closed Captioning
    A service for persons with hearing disabilities that translates television program dialog into written words on the television screen. Closed...
  • Closed circuit Television CCTV
    A system in which a signal is transmitted from a point of origin to only those receivers who have previously...
  • Closed Circuit Test CCT
    a test of the EAN network from FEMA to the EAN program participants, and ending at the facilities of the...
  • CLR
    Clear
  • cluster
    In image processing, a homogeneous group of units, which are very "like" one another. "Likeness" among units is usually determined...
  • CMC
    Central Maintenance Computer
  • CNS
    Communications Navigations and Surveillance
  • CO
    Continetnal
  • CO ROUTE
    Company Route (also CO RTE)
  • Coaxial Cable
    A cable consisting of two conductors with a common axis, separated by a dielectric.
  • Coaxial Cable COAX
    A type of cable commonly used in cable television systems which is composed of two concentric conductors: an inner wire,...
  • COCOT
    Customer-Owned Coin-Operated Telephone
  • Codec
    Coder/decoder equipment used to convert and compress analog video and audio signals into a digital format for transmission, then convert...
  • coherent noise
    Systematic periodic noise in image or calibration data which can be characterized in terms of frequency, phase and amplitude. It...
  • collimate
    (1) To align the axes of instruments, especially optical axes of multiple lenses, so that they have the same spatial...
  • Collision
    A collision is a condition where two devices detect that the network is idle and end up trying to send...
  • color
    That property of an object which is dependent on the wavelength of the light it reflects or, in the case...
  • Color Code
    A system for circuit identifications through use of solid color insulations and/or contrasting tracers.

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