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AXIS COMMUNICATIONS
<Product Name> Quick User’s Guide
Glossary of Terms AXIS 230
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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).
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 organization or
corporation. Usually closed to external traffic.
IP - Internet-Protocol. See TCP/IP.
IP address (number) - 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 practically free of charge.
Lux - A standard unit for light measurement.
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.
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.
RTP - The Real-Time Transport Protocol is an Internet protocol
standard that specifies a way for programs to manage the
real-time transmission of multimedia data over unicast or
multicast network services. RTP combines its data transport
with a control protocol (RTCP), making it possible to monitor
data delivery for large multicast networks. Both protocols work
independently of the underlying Transport layer and Network
layer protocols. As a rule, RTP runs on top of the User
Datagram Protocol (UDP), although it can use other transport
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 IP contains the rules for how the packets are
actually sent and received.
UDP - The User Datagram Protocol is a communications
protocol that offers a limited amount of service when messages
are exchanged between computers in a network that uses the
Internet Protocol (IP). UDP is an alternative to the Transmission
Control Protocol (TCP) and, together with IP, is also known as
UDP/IP.
URL - Uniform Resource Locator. An "address" on the network.
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).
Glossary of Terms