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AXIS COMMUNICATIONS
<Product Name> Quick User’s Guide
AXIS 2120 User’s Manual
76
ActiveX - A control (or set of rules) used by a browser.
ActiveX controls are often downloaded and installed
automatically as required.
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.
BOOTP - A protocol that can automatically configure a
network device (give it an IP address).
Bps - Bits per second. A unit for measuring speeds in
networks. A LAN might run at 10Mbps or 100Mbps.
CGI - Common Gateway Interface. A set of rules (or a
program) that allows a Web Server to communicate with
other programs.
DSL - Digital Subscriber Line. A means of transferring data
via standard phone lines.
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.
Frame Grabber card - Plug-in hardware for "grabbing"
images
FTP - File Transfer Protocol. Used for 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 organisation or
corporation. Usually closed to external traffic.
IP - Internet-Protocol. See TCP/IP.
IP number (address) - A unique number used by a computer
on the network to allow it to be identified and found.
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, that is “open source”
and practiclly free of charge.
Lux - A standard unit for light measurement.
NWAY - A network protocol that automatically negotiates the
highest possible common transmission speed between two
devices.
Null Modem Cable - A cable used for connecting a PC to a serial
device, using the modem protocol for communication.
PING - A small utility used for sending data packets to network
resources to check that they are working and that the network is
intact.
PPP - Point-to-Point Protocol. A method allowing one computer
to connect to another, usually via a modem over a phone line.
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.
SMTP - A common e-mail protocol.
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 and IP
contains the rules for how the packets are actually sent and
received.
URL - Uniform Resource Locator. An "address" on the network.
V.90 - An operating standard for telephone modems.
WAN - Wide-Area-Network. Similar to a LAN, but on a larger
geographical scale.
Web server - A program on a computer that delivers the
resources (usually web pages) requested by the web user (the
client).
Wizard - A program designed specifically to guide the user
through a procedure. Typically used for installations and
configurations.
Glossary of Terms