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AXIS 223M - Glossary of Terms
Glossary of Terms
ActiveX - A software component, also refered to as a
control, that integrates into and extends the Microsoft(R)
Internet Explorer(TM) web browser. ActiveX controls are
typicaly downloaded and installed dynamicaly by the
browser from a web page.
AMC - AXIS Media Control. The control required for
viewing video images in Internet Explorer. Installs
automatically on first use.
API - Application Programming Interface. The Axis API
can be used for integrating Axis products into other
applications.
ARP - Address Resolution Protocol. A protocol used to
associate an IP address to a hardware MAC address. A
request is broadcast on the local network to find out what
the MAC address is for the IP address.
ARTPEC - Axis Real Time Picture Encoder - used for
video image compression.
CCD - Charge Coupled Device. CCD is one of the two main
types of image sensors used in digital cameras. When a
picture is taken, the CCD is struck by light coming
through the camera’s lens. Each of the thousands or
millions of tiny pixels that make up the CCD convert this
light into electrons.
CGI - Common Gateway Interface. A set of rules (or a
program) that allows a Web Server to communicate with
other programs.
Client/Server - Describes the network relationship
between two computer programs in which one, the client,
makes a service request from another - the server.
DC-Iris - This special type of iris is electrically controlled
by the Axis camera, to automatically regulate the amount
of light allowed to enter.
DNS - The Domain Name System (DNS) locates and
translates Internet domain names into IP (Internet
Protocol) addresses.
Ethernet - A widely used networking standard.
ETRAX - A family of microprocessors developed by Axis.
Firewall - A virtual barrier between a LAN (Local Area
Network) and other networks, e.g. the Internet.
FTP - File Transfer Protocol. Used for the simple transfer
of files to and from an FTP-server.
Full-duplex - Transmission of data, e.g. audio, in two
directions simultaneously. In an audio system this would
describe e.g. a telephone system. Half-duplex also
provides bi-directional communication, but only in one
direction at a time, as in a walkie-talkie system. See also
Simplex.
HTML - Hypertext Mark-up Language. Used widely for
authoring documents viewed in web browsers.
HTTP - Hypertext Transfer Protocol. The set of rules for
exchanging files (text, images, sound, video, and other
files) on the World Wide Web.
HTTPS - Hypertext Transfer Protocol over Secure Socket
Layer. A web protocol that provides encryption for page
requests from users and for the pages returned by the web
server.
Intranet - A private network limited to an organization or
corporation. Usually closed to external traffic.
IP - Internet-Protocol. See TCP/IP.
IP address - A unique number used by a network device,
to allow it to be identified and found on the network. The
32-bit IP address is made up of four groups (or quads) of
decimal digits separated by periods. An example of an IP
address is: 192.168.0.1
ISMA - Internet Streaming Media Alliance.
JPEG - A standard image format, used widely for
photographs. Also known as JPG.
LAN - A local area network (LAN) is a group of computers
and associated devices that typically share common
resources within a limited geographical area.
Linux - A popular, free, open source, UNIX like operating
system, developed in cooperation by various individuals
and organizations.
Lux - A standard unit for the measurement of light, where
1 Lux equals the light emitted from a single candle at a
distance of one meter.
Mbit/s - Megabits per second. A unit for measuring
speeds in networks. A LAN might run at 10 or 100 Mbit/s.
MPEG-4 - A video compression standard that makes good
use of bandwidth, and which can provide high-quality
video streams at less than 1 Mbit/s.
Multicast - A bandwidth-conserving technology that
reduces bandwidth usage by simultaneously delivering a
single stream of information to multiple network
recipients.
NTSC - National Television Standards Committee. NTSC is
the standard format used for televisions in most of North
and Central America, and Japan.
NWAY - A network protocol that automatically
negotiates the highest possible common transmission
speed between two devices.
PAL - Phase Altering Line. PAL is the standard format
used for televisions in most of the world (other than the
US, Canada, and Japan).