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AXIS P1311 - Glossary of Terms
VPN (Virtual Private Network) - This creates a secure
"tunnel" between the points within the VPN. Only devices
with the correct "key" will be able to work within the VPN.
The VPN network can be within a company LAN (Local
Area Network), but different sites can also be connected
over the Internet in a secure way. One common use for
VPN is for connecting a remote computer to the corporate
network, via e.g. a direct phone line or via the Internet.
VOP (Video Object Plane) - A VOP is an image frame in an
H.264
video stream. There are several types of VOP:
- An I-VOP is complete image frame.
- A P-VOP codes the differences between images, as long
as i
t is more efficient to do so. Otherwise it codes the whole
image, which may also be a completely new image.
WAN (Wide-Area-Network) - Similar to a LAN, but on a
large
r geographical scale.
W-LAN (Wireless LAN) - A wireless LAN is a wireless local
area
network that uses radio waves as its carrier: where the
network connections for end-users are wireless. The main
network structure usually uses cables.
Web server - A web server is a program, which allows
we
b browsers to retrieve files from computers connected to
the Internet. The web server listens for requests from web
browsers and upon receiving a request for a file sends it
back to the browser.
The primary function of a web server is to serve pages to
other remote
computers; consequently, it needs to be
installed on a computer that is permanently connected to
the Internet. It also controls access to the server whilst
monitoring and logging server access statistics.
WEP (Wireless Equivalent Privacy) - A wireless security
protoc
ol, specified in the IEEE 802.11 standard, which is
designed to provide a wireless local area network (WLAN)
with a level of security and privacy comparable to that
usually expected of a wired LAN. Security is at two
different levels; 40-bit and 128-bit encryption. The higher
the bit number, the more secure the encryption.
WPA-PSK (Wi-Fi Protected Access - Pre-Shared Key) -
This wireless encryption method uses a pre-shared key
(PSK) for ke
y management. Keys can usually be entered as
manual hex values, as hexadecimal characters, or as a
Passphrase. WPA-PSK provides a greater degree of security
than WEP.
Zoom lens - A zoom lens can be moved (zoomed) to
enla
rge the view of an object to show more detail.
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