Beward DS03M Operation User's Manual page 61

ARP (Address Resolution Protocol) is used to associate an IP address to a hardware
MAC address. A request is broadcast on the local network to discover the MAC address for an IP
address.
Aspect ratio is a ratio of width to height in images. A common aspect ratio used for
television screens and computer monitors is 4:3. High-definition television (HDTV) uses an aspect
ratio of 16:9.
Authentication is the process of identifying an individual, usually based on a user name
and password. In security systems, authentication is distinct from authorization, which is the
process of giving individuals access to system objects based on their identity. Authentication
merely ensures that the individual is who he or she claims to be, but says nothing about the access
rights of the individual.
Autoiris (or DC-Iris).This special type of iris is electrically controlled by the camera, to
automatically regulate the amount of light allowed to enter.
Bit rate: (in kbit/s or Mbit/s) is often referred to as speed, but actually defines the number of
bits/time unit and not distance/time unit.
Backlight Compensation compensates for strong backlighting, so that subjects appear
clearly instead of as silhouettes.
Bonjour, also known as zero-configuration networking, Bonjour enables automatic
discovery of computers, devices, and services on IP networks. Bonjour allows devices to
automatically discover each other without the need to enter IP addresses or configure DNS
servers. Bonjour is developed by Apple Computer Inc.
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
IP Video Door Station DS03M(P) Operation User Manual
Appendices
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