Filter
Top Products
46
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 - A
XIS Media Control. The control required for viewing video
images in Internet Explorer. Installs automatically on first use.
API - A
pplication 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 De
vice. 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 - De
scribes 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 Doma
in 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 Transfe
r 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 - In
ternet-Protocol. See TCP/IP.
IP address - A unique numbe
r 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 - Inte
rnet Streaming Media Alliance
JPEG - A s
tandard image format, used widely for photographs. Also
known as JPG.
LAN - A local are
a network (LAN) is a group of computers and associated
devices that typically share common resources within a limited
geographical area.
Linux - A popular opera
ting system, which is “open source” and
practically free of charge.
Lux - A sta
ndard 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 vide
o 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 Ma
il. 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.
Pre/post alarm image
- The images from immediately before and after
an alarm.
Privacy mask
- An image or specified area used to block out certain
parts of the video image.
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 dev
ice 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).
RTP- Real
-Time Transfer Protocol. A transfer protocol designed for
delivery of live contents, e.g. MPEG-4.
Simplex
- In simplex operation, a network cable or communications
channel can send information in one direction only.
SMTP -
A common e-mail protocol.
SNMP -
Simple Network Management Protocol. An application layer
protocol that facilitates the exchange of management information
between network devices. It is part of the Transmission Control
Protocol/Internet Protocol (TCP/IP) protocol suite.
Subnet Mask - An IP addre
ss 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.
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.
Unicast - Com
munication that takes place over a network between a
single sender and a single receiver.
UPnP
TM
- Allows the automatic peer-to-peer detection of devices on the
network.
URL - Uniform Resource Locator. An
“address" on the network.
Varifocal - A varifocal lens provid
es a wide range of focal lengths, as
opposed to a lens with a fixed focal length, which only provides one.
WAN -
Wide-Area-Network. Similar to a LAN, but on a larger
geographical scale.