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AXIS 225FD - Glossary of Terms
Glossary of Terms
ActiveX - A control (or set of rules) used by a browser.
ActiveX controls are often downloaded and installed
automatically as required.
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 - Axis' own microprocessor.
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.
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 operating system, which is “open
source” and practically free of charge.
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).
PEM - Privacy Enhanced Mail. An early standard for
securing electronic mail. The PEM-format is often used
for representing an HTTPS certificate or certificate
request.
Ping - A small utility used for sending data packets to
network resources to check that they are working and that
the network is intact.