Glossary Of Terms - Axis 210 User Manual

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 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 for assigning
an IP address to a physical device address that is recognized
in the local network. The ARP command can be used to set
the IP-address for your product.
ARTPEC - Axis Real Time Picture Encoder - used for image
compression.
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.
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.
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
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.
NWAY - A network protocol that automatically negotiates
the highest possible common transmission speed between
two devices.
Ping - A small utility used for sending data packets to
network resources to check that they are working and that
the network is intact.
Pre/post alarm image - The images from immediately
before and after an alarm.
Protocol - A special set of rules governing how two entities
will communicate. Protocols are found at many levels of
communication, and there are hardware protocols and
software protocols.
Router - A device that determines the next network point to
which a packet should be forwarded on its way to its final
destination. A router is often included as part of a network
switch (see below.)
SMTP - A common e-mail protocol.
Subnet Mask - An IP address consists of two components:
the network address and the host address. "Subnetting'
enables a network administrator to further divide the host
part of the address into two or more subnets. The subnet
mask identifies the subnet to which an IP address belongs.
Switch - Whilst a simple hub transmits all data to all
devices connected to it, a switch only transmits the data to
the device it is specifically intended for.
TCP/IP - Transmission Control Protocol/Internet Protocol. A
suite of network protocols that determine how data is
transmitted. TCP/IP is used on many networks, including
the Internet. TCP keeps track of the individual packets of
information and IP contains the rules for how the packets
are actually sent and received.
URL - Uniform Resource Locator. An "address" on the
network.
Varifocal - A varifocal lens provides a wide range of focal
lengths, as opposed to a lens with a fixed focal length,
which only provides one.
AXIS 210 - Glossary 47