User`s manual

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AXIS 207 - Glossary of Terms
Glossary of Terms
AAC - An audio compression format defined by MPEG-2. Higher quality than MPEG-1 but requires less data for audio
reproduction.
Active Speaker - a speaker with a built-in power amplifier.
ActiveX - control (or set of rules) used by a browser. ActiveX controls are often downloaded and installed automatically as
required.
ADPCM - Adaptive Differential Pulse Code Modulation. Predicts the analog signal digitally and the difference is coded.
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 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 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.
CMOS - (Complementary Metal Oxide Semiconductor) CMOS is a widely used type of semiconductor that requires less power
than chips using just one type of transistor. CMOS image sensors also allow processing circuits to be included on the same
chip, an advantage not possible with CCD sensors.
Client/Server - Describes the network relationship between two computer programs in which one, the client, makes a service
request from another - the server.
dB (Decibels) - A unit to measure sound level changes. A 3dB change is the smallest level change we can hear. A 3dB
change is actually twice or half the audio power level. A gain of 0dB will leave the signal level unchanged.
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.
HAD - Hole Accumulation Diode. A HAD CCD design allows for more light to reach the imager, which reduces video noise to
improve signal-to-noise ratio by up to 6dB (2x better than a standard CCD imager). Particularly effective when shooting in
dark situations.
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
ISMA - Internet Streaming Media Alliance
ISP - Internet Service Provider
JPEG - A standard image format, used widely for photographs. Also known as JPG.