User`s manual

computer (allowing a user to shut down w/out losing data or continue for a
specific time period) for a short period of time during a power failure.
URL
URL is the abbreviation of Uniform Resource Locator. It is the Internet,
global address that required by a software browser to find the Internet
resource or document on World Wide Web (WWW).
UTP
UTP stands for Unshielded Twisted Pair. It is a common type of twisted pair
wiring used to transmit video signals across distances. UTP has longer
reachable distances and is cheaper and easier to work with.
Unicast
Unicast defines the communication between a single receiver and a single
sender over a network.
USB (Universal Serial Bus)
A set of connectivity interface allows quick and easy connection of
peripherals, such as printer and scanner, to a PC.
V
Vari-focal lens
Contrary to the fixed focal length lens, vari-focal lens are able to vary its
focal length to zoom in/out on images. An auto iris feature is required in
order to achieve this.
Vertical resolution
Contrast with horizontal resolution, vertical resolution defines the number
of elements, such as rows, dots, or lines, from the top to the bottom in an
image.
Video compression
The “compression” technology means packing the information into a
smaller space. Under many situations the video signal takes up a lot of
space and results in the demanding requirement of bit rate and file size.