Dell PowerEdge 400SC - Manual (Page 29)

Some devices (such as the last device at each end of a SCSI cable) must be terminated to prevent reflections and spurious signals in the cable. When such
devices are connected in a series, you may need to enable or disable the termination on these devices by changing jumper or switch settings on the devices
or by changing settings in the configuration software for the devices.
UL
Underwriters Laboratories
UNIX
UNiversal Internet eXchange. UNIX, precursor to Linux, is an operating system written in the C programming language.
uplink port
A port on a network hub or switch used to connect to other hubs or switches without requiring a crossover cable
UPS
Uninterruptible power supply; a battery-powered unit that automatically supplies power to your system in the event of an electrical failure
USB
Universal Serial Bus. A USB connector provides a single connection point for multiple USB-compliant devices, such as mice and keyboards. USB devices can
be connected and disconnected while the system is running.
utility
A program used to manage system resources—memory, disk drives, or printers, for example
UTP
Unshielded twisted pair
V
Volt(s)
VAC
Volt(s) alternating current
VDC
Volt(s) direct current
VGA
Video graphics array. VGA and SVGA are video standards for video adapters with greater resolution and color display capabilities than previous standards.
video adapter
The logical circuitry that provides—in combination with the monitor—your system's video capabilities. A video adapter may be integrated into the system
board or may be an expansion card that plugs into an expansion slot.
video driver
A program that allows graphics-mode application programs and operating systems to display at a chosen resolution with the desired number of colors.
Video drivers may need to match the video adapter installed in the system.
video memory
Most VGA and SVGA video adapters include memory chips in addition to your system's RAM. The amount of video memory installed primarily influences the