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35 Cards in this Set
- Front
- Back
AM (Amplitude Modulation)
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Modulates the height of the carrier wave.
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Angle of Incidence
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The angle at which the ray hits the glass surface.
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Angle of Reflection
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The angle at which the ray hits the glass surface.
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Attenuation
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Loss of communication signal energy.
N0CCJ |
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backbone
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The part of the network that acts as rhe primary path for the traffic that is most often sourced from, and destined for, other networks.
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Coaxial Cable
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A cable consisting of a hollow outer cylindrical conductor that surrounds a single inner wire conductor.
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Crosstalk
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The unwanted reception of electromagnetic signals on a wire from a nearby wire.
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Dispersion
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The Broadening of the light signals along the length of the fiber.
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DSSS (Direct-Sequence Spread Spectrum)
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A Technologyin which transmissions are more reliable because each bit (1 or 0) is represented by a string of 1s and 0s, called a chipping sequence.
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EIA (Electronics Industry Association)
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A Group that specifies electrical transmission standards. The EIA and TIA have developed numerous well-known communication standards.
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FHSS (Frequency-Hopping Spread Spectrum)
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A technology in which transmissions hop from one frequency to another in random patterns. This feature enables the transmissions to hop around narrowband interference, resulting in a clearer signal and higher reliability of the transmissions
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Fiber-Optic Cable
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A physical medium capable of conducting modulated light transmission. Compared with other transmission media, fiber-optic cable is more expensive but is not susceptible to electromagnetic interference. Sometimes called optical fiber
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FM (Frequency Modualation)
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Modulates the frequency of the wave
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IEEE (Institute of Electrical and Electronic Engineers)
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A proffesional organization whose activities include the development of communications and network standards.
N0CCJ |
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Impedance
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The Resistance to the movement of electron in an AC Circuit.
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Media
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The plural of medium. Media refers to vaious physical enviroments through which transmission signals pass.
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Modal Dispersion
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When Multiple modes of light propagating through fiber travel different distances, depending on their entry angles, which causes them to arrive at the destination at slightly different times,
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Multimode
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A type of fiber-optic cable that transmits more than one light path
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Noise
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An unwanted electrical signal on a wire that interferes with the quality of the signal by altering its shape.
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Patch Panel
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An Assembly of Pin Locations and Ports that can be mounted on a rack or wall bracketin the wiring closet. It acts like a switchboard that connects workstations cables to each other and to the outside.
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PM (Phase Modulation)
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Modulates the polarity (phase) of the wave.
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Reflection
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The photons of light striking a surface and leaving that surface in an equal but oppisite direction.
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Resistance
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The property of a material that resists electron movement.
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Refraction
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The change of direction of a beam of a light when it enters another medium.
N0CCJ |
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RFI (Radio Frequency Interference)
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The noise on wires caused by radio signals.
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Single-Mode
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and optical fiber that has only one mode of light transmission. contrast with multimode.
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SS (spread spectrum)
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a modulation technique developed in the 1940's that spreads a transmission signal over a broadband of radio frequencies. The term spread spectrum describes a modulation technique that sacrifices bandwidth to gain signal-to-noise ratio.
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Standard
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A set of rules or procedures that are either widely used or officially specified.
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STP (shielded twisted pair)
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A two-pair wiring medium used in a variety of network implementations. STP cableing has a layer a layer of shielded insulation to reduce EMI.
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Thicknet
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an early form of coaxial cable using 10base5 for networking. Thicknet was once desirable because it could carry signals up to 500 meters.
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Thinnet
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A simple, thin, coaxial network cable for the 10base2 system. Thinnet can carry a signal only 185 meters, but was much easier to work with than thicknet.
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TIA (Telecommunications Industry Associations)
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A standards association that publishes standards for telecommunications.
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UTP (Unshielded Twisted Pair)
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A four pair wire medium used in a variety of networks.
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Wavelength
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The length of a wave measured from anypoint on one wave to the corresponding point on the next wave, The wavelength of light is usually measured in nanometers (nm).
N0CCJ |
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WEP (Wired Equivalent Privacy)
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A security mechanism, defined within the 802.11 standard, that is designed to protect the over-the-air transmission between wireless LAN APs and NICs.
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