Quadrox WebCCTV User Manual - Manual (Page 166)

WebCCTV User Manual 166
Version 4.9 Series
CRT – is the abbreviation for Cathode Ray Tube. This is a vacuum tube in which
beams are projected on a fluorescent screen-producing luminous spots. An
example is the television set.
Cursor – is a small blinking rectangle or line that indicates the current position on the
display screen.
Curtain areas – are areas of constant movement and are classified as not important
for surveillance.
D
Data compression – p rocess of reducing the amount of data needed for storage or
transmission of a given piece of information (text, graphics, video, sound,
etc.), typically by use of encoding techniques.
Default – is the parameter value automatically selected by the system when you or the
program does not provide instructions. It is also called a preset value.
Delete – the removing of data from a disk or other data storage device.
Dialog box – an interface element that requires the user to provide further
information, such as number of copies to print.
Differential transmission – an option allowing the decrease in the amount of data
sent over the network, because only the differences between images are sent
over the network when this option is enabled.
Display – CRT, plasma screen, LCD, or other image producing device used to view
computer output.
DNS (Domain Name System) – is a database system that translates an IP address into
a domain name. For example, a numeric address like 192.168.120.54 can
become something like camerasite.com.
Driver – is a program that controls communication between a specific peripheral
device and the computer.
Drop-down button (menu) – is a menu of options that appears below the item when
the computer user clicks on it.
F
Fan (Cooler) – a device for hardware components cooling.
File – a collection of related information; a file can contain data, programs or both.
Folder – Windows element used to store documents or other folders.
Frame rate – an option used in the recordings setting for defining the number of
frames recorded per second per camera.