Axis P3346 User Manual

Also see for P3343-VE: Datasheet Installation guide User manual Installation guide Installation guide

67Glossary of Termsinterface (API).SSL/TSL (Secure Socket Layer/Transport Layer Security)These two protocols (SSL is succeeded by TSL) are cryptographicprotocols that provide secure communication on a network. SSLis commonly used over HTTP to form HTTPS, as used e.g. on theInternet for electronic financial transactions. SSL uses publickey certificates to verify the identity of the server.Subnet/subnet mask - A subnet is an identifiably separatepart of an organization's network. Typically, a subnet mayrepresent all the machines at one geographic location, in onebuilding, or on the same local area network (LAN). Having anorganization's network divided into subnets allows it to beconnected to the Internet with a single shared network address.The subnet mask is the part of the IP address that tells anetwork router how to find the subnet that the data packetshould be delivered to. Using a subnet mask saves the routerhaving to handle the entire 32-bit IP address; it simply looks atthe bits selected by the mask.Switch - A switch is a network device that connects networksegments together, and which selects a path for sending a unitof data to its next destination. In general, a switch is a simplerand faster mechanism than a router, which requires knowledgeabout the network and how to determine the route. Someswitches include the router function. See also Router.TCP (Transmission Control Protocol) - TCP is used along withthe Internet Protocol (IP) to transmit data as packets betweencomputers over the network. While IP takes care of the actualpacket delivery, TCP keeps track of the individual packets thatthe communication (e.g. requested a web page file) is dividedinto, and, when all packets have arrived at their destination, itreassembles them to re-form the complete file.TCP is a connection-oriented protocol, which means that aconnection is established between the two end-points and ismaintained until the data has been successfully exchangedbetween the communicating applications.Telnet - Telnet is a simple method with which to accessanother network device, e.g. a computer. The HTTP protocol andthe FTP protocols allow you to request specific files fromremote computers, but do not allow you logon as a user of thatcomputer. With Telnet, you log on as a regular user withwhatever privileges you may have been granted for specificapplications and data residing on that computer.UDP (User Datagram Protocol) - UDP is a communicationsprotocol that offers limited service for exchanging data in anetwork that uses the Internet Protocol (IP). UDP is analternative to the Transmission Control Protocol (TCP). Theadvantage of UDP is that it is not required to deliver all dataand may drop network packets when there is e.g. networkcongestion. This is suitable for live video, as there is no point inre-transmitting old information that will not be displayedanyway.Unicast - Communication between a single sender and a singlereceiver over a network. A new connection is established foreach new user.URL (Uniform Resource Locator) - An "address" on thenetwork.Varifocal lens - A varifocal lens provides a wide range of focallengths, as opposed to a lens with a fixed focal length, whichonly provides one.VPN (Virtual Private Network) - This creates a secure"tunnel" between the points within the VPN. Only devices withthe correct "key" will be able to work within the VPN. The VPNnetwork can be within a company LAN (Local Area Network),but different sites can also be connected over the Internet in asecure way. One common use for VPN is for connecting aremote computer to the corporate network, via e.g. a directphone line or via the Internet.VOP (Video Object Plane) - A VOP is an image frame in anH.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 itis 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 alarger geographical scale.W-LAN (Wireless LAN) - A wireless LAN is a wireless localarea network that uses radio waves as its carrier: where thenetwork connections for end-users are wireless. The mainnetwork structure usually uses cables.Web server - A web server is a program, which allows webbrowsers to retrieve files from computers connected to theInternet. The web server listens for requests from web browsersand upon receiving a request for a file sends it back to thebrowser.The primary function of a web server is to serve pages to otherremote computers; consequently, it needs to be installed on acomputer that is permanently connected to the Internet. It alsocontrols access to the server whilst monitoring and loggingserver access statistics.WPA-PSK (Wi-Fi Protected Access - Pre-Shared Key) - Thiswireless encryption method uses a pre-shared key (PSK) for keymanagement. Keys can usually be entered as manual hexvalues, 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 enlargethe view of an object to show more detail.

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