Axis 212 PTZ-V [55/57] Axis 212 ptz v glossary of terms
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Axis 212 PTZ-V [55/57] Axis 212 ptz v glossary of terms

Axis 212 PTZ-V [55/57] Axis 212 ptz v glossary of terms
AXIS 212 PTZ/-V - Glossary of Terms
Sockets - Sockets are a method for communication between a client
program and a server program over a network. A socket is defined as
“the endpoint in a connection.” Sockets are created and used with a set
of programming requests or “function calls” sometimes called the
sockets application programming interface (API).
SSL/TSL (Secure Socket Layer/Transport Layer Security) - These two
protocols (SSL is succeeded by TSL) are cryptographic protocols that
provide secure communication on a network. SSL is commonly used
over HTTP to form HTTPS, as used for example, on the Internet for
electronic financial transactions. SSL uses public key certificates to
verify the identity of the server.
Subnet/subnet mask - A subnet is an identifiably separate part of an
organization's network. Typically, a subnet may represent all the
machines at one geographic location, in one building, or on the same
local area network (LAN). Having an organization's network divided into
subnets allows it to be connected to the Internet with a single shared
network address.
The subnet mask is the part of the IP address that tells a network router
how to find the subnet that the data packet should be delivered to.
Using a subnet mask saves the router having to handle the entire 32-bit
IP address; it simply looks at the bits selected by the mask.
Switch - A switch is a network device that connects network segments
together, and which selects a path for sending a unit of data to its next
destination. In general, a switch is a simpler and faster mechanism than
a router, which requires knowledge about the network and how to
determine the route. Some switches include the router function. See
also Router.
TCP (Transmission Control Protocol) - TCP is used along with the
Internet Protocol (IP) to transmit data as packets between computers
over the network. While IP takes care of the actual packet delivery, TCP
keeps track of the individual packets that the communication (for
example, requested a web page file) is divided into, and, when all
packets have arrived at their destination, it reassembles them to
re-form the complete file.
TCP is a connection-oriented protocol, which means that a connection
is established between the two end-points and is maintained until the
data has been successfully exchanged between the communicating
applications.
Telnet - Telnet is a simple method with which to access another
network device, for example, a computer. The HTTP protocol and the FTP
protocols allow you to request specific files from remote computers, but
do not allow you logon as a user of that computer. With Telnet, you log
on as a regular user with whatever privileges you may have been
granted for specific applications and data residing on that computer.
TVL (TV Lines) - A method of defining resolutions in analog video.
UDP (User Datagram Protocol) - UDP is a communications protocol
that offers limited service for exchanging data in a network that uses
the Internet Protocol (IP). UDP is an alternative to the Transmission
Control Protocol (TCP). The advantage of UDP is that it is not required to
deliver all data and may drop network packets when there is for
example, network congestion. This is suitable for live video, as there is
no point in re-transmitting old information that will not be displayed
anyway.
Unicast - Communication between a single sender and a single
receiver over a network. A new connection is established for each new
user.
URL (Uniform Resource Locator) - An “address” on the network.
USB - (Universal Serial Bus) A plug-and-play interface between a
computer and peripheral devices, for example, scanners, printers, etc.
Varifocal lens - A varifocal lens provides a wide range of focal lengths,
as opposed to a lens with a fixed focal length, which only provides one.
VPN (Virtual Private Network) -
This creates a secure “tunnel”
bet
ween 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 for
example, 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 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.

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