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AXIS 207MW - Glossary of Terms
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 128-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-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.