Dell Latitude ATG D620 User Manual page 207

Glossary: Dell Latitude ATG D620 User's Guide
security software enhances network and computer security by enabling features such as file and e-mail
protection.
travel module — A plastic device designed to fit inside the module bay of a portable computer to
reduce the weight of the computer.
U
UMA — unified memory allocation — System memory dynamically allocated to video.
UPS — uninterruptible power supply — A backup power source used when the electrical power fails or
drops to an unacceptable voltage level. A UPS keeps a computer running for a limited amount of time
when there is no electrical power. UPS systems typically provide surge suppression and may also
provide voltage regulation. Small UPS systems provide battery power for a few minutes to enable you
to shut down your computer.
USB — universal serial bus — A hardware interface for a low-speed device such as a USB-compatible
keyboard, mouse, joystick, scanner, set of speakers, printer, broadband devices (DSL and cable
modems), imaging devices, or storage devices. Devices are plugged directly in to a 4-pin socket on
your computer or in to a multi-port hub that plugs in to your computer. USB devices can be connected
and disconnected while the computer is turned on, and they can also be daisy-chained together.
UTP — unshielded twisted pair — Describes a type of cable used in most telephone networks and some
computer networks. Pairs of unshielded wires are twisted to protect against electromagnetic
interference, rather than relying on a metal sheath around each pair of wires to protect against
interference.
UXGA — ultra extended graphics array — A video standard for video cards and controllers that
supports resolutions up to 1600 x 1200.
V
video controller — The circuitry on a video card or on the system board (in computers with an
integrated video controller) that provides the video capabilities—in combination with the monitor—for
your computer.
video memory — Memory that consists of memory chips dedicated to video functions. Video memory
is usually faster than system memory. The amount of video memory installed primarily influences the
number of colors that a program can display.
video mode — A mode that describes how text and graphics are displayed on a monitor. Graphics-
based software, such as Windows operating systems, displays in video modes that can be defined as x
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