Glossary
Term | Main definition |
---|---|
Videoconferencing |
The act of conducting conferences via a video telecommunications
system, local area network, or wide area
network.
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Videophone |
A telephone-like device that provides a picture as well
as sound.
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Visible light |
Electromagnetic radiation visible to the human eye at
wavelengths between 400nm and 700nm.
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Visual fault locator (VFL) |
A testing device consisting of a red laser that fills the fiber
core with light, allowing a technician to find problems
such as breaks and macrobends by observing the light
through the buffer, and sometimes the jacket, of the cable.
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Voice circuit |
A telephone company circuit capable of carrying one
telephone conversation. The voice circuit is the standard
unit in which telecommunications capacity is counted.
The U.S. analog equivalent is 4KHz. The digital equivalent
is 56Kbps in the U.S. and 64Kbps in Europe. In the
U.S., the Federal Communications Commission restricts
the maximum data rate on a voice circuit to 53Kbps.
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Voice-grade |
A term used for twisted-pair cable used in telephone systems
to carry voice signals. Usually Category 3 or lower
cable, though voice signals can be carried on cables that
are higher than Category 3.
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Volt |
A unit of expression for electrical potential or potential
difference. Abbreviated as V.
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Voltage drop |
The voltage developed across a component by the current
flow through the resistance of the component.
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W |
(1) Symbol for watt or wattage. (2) Abbreviation for white
when used in conjunction with twisted-pair cable color
codes; may also be Wh.
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Wall plate |
A wall plate is a flat plastic or metal that usually mounts
in or on a wall. Wall plates include one or more jacks.
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WAN Wide area network | A network that crosses local, regional, and international boundaries. Some types of internetwork technology such as a leased-line, ATM, or frame relay connect local area networks (LANs) together to form WANs.
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Watt |
A unit of electrical power.
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Waveform |
A graphical representation of the amplitude of a signal
over time.
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Waveguide |
A structure that guides electromagnetic waves along
their length. The core fiber in an optical-fiber cable is an
optical waveguide.
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Waveguide couplers |
A connection in which light is transferred between
waveguides.
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