Operating instructions

many other networking technologies. UTP is available in a variety of grades,
called categories, as follows:
Category 1 UTP Regular analog phone lines—not used for data
communications.
Category 2 UTP Supports speeds up to 4 megabits per second.
Category 3 UTP Supports speeds up to 16 megabits per second.
Category 4 UTP Supports speeds up to 20 megabits per second.
Category 5 UTP Supports speeds up to 100 megabits per second.
V standards Standards established by CCITT for modem manufacturers to
follow (voluntarily) to ensure compatible speeds, compression, and error
correction.
VESA (Video Electronics Standards Association) A consortium of computer
manufacturers that standardized improvements to common IBM PC compo-
nents. VESA is responsible for the Super VGA video standard and the VLB bus ar-
chitecture.
VGA (Video Graphics Array) The standard for the video graphics adapter that
was built into IBM’s PS/2 computer. It supports 16 colors in a 640 × 480 pixel
video display, and quickly replaced the older CGA (Color Graphics Adapter)
and EGA (Extended Graphics Adapter) standards.
VIA Technologies Major manufacturer of chipsets for motherboards. Also
produces Socket 370 CPUs through its subsidiary Cyrix that compete directly
with Intel.
video card An expansion card that works with the CPU to produce the im
-
ages that are displayed on your computer’s display.
virtual Pertaining to a device or facility that does not physically exist, yet be
-
haves as if it does. For example, a system with 4 MB of virtual memory may have
only 1 MB of physical memory plus additional (slower and cheaper) auxiliary
memory. Yet programs written as if 4 MB of physical memory were available
will run correctly.
70 MIKE MEYERS’ A+ CERTIFICATION PASSPORT
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
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