Appendix C. Glossary - Beward N13103 Installation & User Manual

Appendix C. Glossary

3GP (3GPP file format) is a multimedia container format defined by the Third Generation
Partnership Project (3GPP) for 3G UMTS multimedia services. It is used on 3G mobile phones but
can also be played on some 2G and 4G phones.
ActiveX is a standard that enables software components to interact with one another in a
networked environment, regardless of the language(s) used to create them. Web browsers may
come into contact with ActiveX controls, ActiveX documents, and ActiveX scripts. ActiveX controls
are often downloaded and installed automatically as required.
Asymmetric Digital Subscriber Line (ADSL) is an obsolete type of Digital Subscriber Line
technology, a data communications technology that enables faster data transmission over copper
telephone lines than a conventional voiceband modem can provide.
Angle is the field of view, relative to a standard lens in a 35mm still camera, expressed in
degrees, e.g. 30°. For practical purposes, this is the area that a lens can cover, where the angle of
view is determined by the focal length of the lens. A wide-angle lens has a short focal length and
covers a wider angle of view than standard or telephoto lenses, which have longer focal lengths.
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 username
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.
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