Beward N120 Installation & User Manual page 82

CCD (Charged Coupled Device). This light-sensitive image device used in many digital
cameras is a large integrated circuit that contains hundreds of thousands of photo-sites (pixels)
that convert light energy into electronic signals. Its size is measured diagonally and can be 1/4",
1/3", 1/2" or 2/3".
CGI (Common Gateway Interface) is a specification for communication between a web
server and other (CGI) programs. For example, a HTML page that contains a form might use a CGI
program to process the form data once it is submitted.
Classless Inter Domain Routing (CIDR) is a method for assigning IP addresses without
using the standard IP address classes like Class A, Class B or Class C. In CIDR notation, an IP
address is represented as A.B.C.D /n, where "/n" is called the IP prefix or network prefix. The IP
prefix identifies the number of significant bits used to identify a network. For example, 192.9.205.22
/18 means, the first 18 bits are used to represent the network and the remaining 14 bits are used to
identify hosts. Common prefixes are 8, 16, 24, and 32.
Complementary metal–oxide–semiconductor (CMOS) is a technology for constructing
integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM,
and other digital logic circuits. CMOS technology is also used for several analog circuits such as
image sensors (CMOS sensor), data converters, and highly integrated transceivers for many types
of communication.
Dynamic DNS is a method/protocol/network service that provides the capability for a
networked device, such as a router or computer system using the Internet Protocol Suite, to notify
a Domain Name System (DNS) name server to change, in real time, the active DNS configuration
of its configured hostnames, addresses or other information.
DHCP (Dynamic Host Configuration Protocol) is a protocol that lets network
administrators automate and centrally manage the assignment of Internet Protocol (IP) addresses
to network devices in a network. DHCP uses the concept of a "lease" or amount of time that a
given IP address will be valid for a computer. The lease time can vary, depending on how long a
user is likely to require the network connection at a particular location. DHCP also supports static
addresses for e.g. computers running web servers, which need a permanent IP address.
Digital zoom is a method of decreasing (narrowing) the apparent angle of view of a digital
photographic or video image. Digital zoom is accomplished by cropping an image down to a
centered area with the same aspect ratio as the original, and usually also interpolating the result
back up to the pixel dimensions of the original. It is accomplished electronically, with no adjustment
of the camera's optics, and no optical resolution is gained in the process.
Domain server can also be used by organizations that wish to centralize the management
of their (Windows) computers. Each user within a domain has an account that usually allows them
to log in to and use any computer in the domain, although restrictions may also apply. The domain
server is the server that authenticates the users on the network.
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