Bedienungsanleitung Axis P3346 (Seite 67 von 68) (Englisch)

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Glossary of Terms

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 e.g. 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 (e.g. 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, e.g. 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.

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 e.g. 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.

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" 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 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.

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.

Axis P3346 Seite 67

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