Axis 211W User Manual page 50

AXIS 211W - Glossary of Terms
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 MPEG-4
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 it 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 larger
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 Web 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 protocol,
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 104-bit encryption. The higher the bit
number, the more secure the encryption.
WINS (Windows Internet Naming Service) - Part of the Microsoft
Windows NT Server, WINS manages the association of workstation
names and locations with IP addresses, without the user or administrator
having to be involved in each configuration change.
WPA-/WPA2-Enterprise - This wireless encryption method provides
stronger data protection for multiple users and larger networks.
Unauthorized network access is prevented by verifying users through a
server.
WPA-/WPA2-PSK (Wi-Fi Protected Access - Pre-Shared Key) - This
wireless encryption method uses a pre-shared key (PSK) for key
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 enlarge the view of
an object to show more detail.
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