Axis P8513 User Manual

Also see for P8513: Installation guide User manual

39AXIS P85 Series - Glossary of Termstranslate Internet domain names into IP (Internet Protocol)addresses. A domain name is a meaningful andeasy-to-remember name for an Internet address. For examplethe domain name www.example.com is much easier toremember than 192.0.34.166. The translation tables for domainnames are contained in Domain name servers.Domain Server - Domains can also be used by organizationswho wish to centralize the management of their (Windows)computers. Each user within a domain has an account thatusually allows them to log in to and use any computer in thedomain, although restrictions may also apply. The domainserver is the server that authenticates the users on the network.Ethernet - Ethernet is the most widely installed local areanetwork technology. An Ethernet LAN typically uses specialgrades of twisted pair wires. The most commonly installedEthernet systems are 10BASE-T and 100BASE-T10, whichprovide transmission speeds up to 10 Mbps and 100 Mbpsrespectively.ETRAX (Ethernet Token Ring AXIS) - Axis' ownmicroprocessor.Factory default settings - These are the settings thatoriginally applied for a device when it was first delivered fromthe factory. If it should become necessary to reset a device toits factory default settings, this will, for many devices,completely reset any settings that were changed by the user.Firewall - A firewall works as a barrier between networks, e.g.between a Local Area Network and the Internet. The firewallensures that only authorized users are allowed to access theone network from the other. A firewall can be software runningon a computer, or it can be a standalone hardware device.Focal length - Measured in millimeters, the focal length of acamera lens determines the width of the horizontal field ofview, which in turn is measured in degrees.FTP (File Transfer Protocol) - An application protocol thatuses the TCP/IP protocols. It is used to exchange files betweencomputers/devices on networks.Frame - A frame is a complete video image. In the 2:1interlaced scanning format of the RS-170 and CCIR formats, aframe is made up of two separate fields of 262.5 or 312.5 linesinterlaced at 60 or 50 Hz to form a complete frame, whichappears at 30 or 25 Hz. In video cameras with a progressivescan, each frame is scanned line-by-line and not interlaced;most are also displayed at 30 and 25 Hz.Frame rate - The frame rate used to describe the frequency atwhich a video stream is updated is measured in frames persecond (fps). A higher frame rate is advantageous when there ismovement in the video stream, as it maintains image qualitythroughout.Gain - Gain is the amplification factor and the extent to whichan analog amplifier boosts the strength of a signal.Amplification factors are usually expressed in terms of power.The decibel (dB) is the most common way of quantifying thegain of an amplifier.Gateway - A gateway is a point in a network that acts as anentry point to another network. In a corporate network forexample, a computer server acting as a gateway often also actsas a proxy server and a firewall server. A gateway is oftenassociated with both a router, which knows where to direct agiven packet of data that arrives at the gateway, and a switch,which furnishes the actual path in and out of the gateway for agiven packet.GIF (Graphics Interchange Format) - GIF is one of the mostcommon file formats used for images in web pages. There aretwo versions of the format, 87a and 89a. Version 89a supportsanimations, i.e. a short sequence of images within a single GIFfile. A GIF89a can also be specified for interlaced presentation.GOV (Group Of VOPs) - A group of VOPs is the basic unit ofan H.264 video stream. The GOV contains different types andnumbers of VOPs (I-VOPs, P-VOPs) as determined by the GOVlength and GOV structure. See also VOP.GOV length - The GOV length determines the number ofimages (VOPs) in the GOV structure. See also GOV and VOP.GOV structure - The GOV structure describes the compositionof an H.264 video stream, as regards the type of images (I-VOPsor P-VOPs) included in the stream, and their internal order. Seealso GOV and VOP.H.264 - Also known as MPEG-4 Part 10. This is the newgeneration compression standard for digital video. H.264 offershigher video resolution than Motion JPEG at the same bit rateand bandwidth, or the same quality video at a lower bit rate.HTML (Hypertext Markup Language) - HTML is the set of"markup" symbols or codes inserted in a file intended fordisplay in web browser. The markup tells the browser how todisplay the page's words and images for the user.HTTP (Hypertext Transfer Protocol) - HTTP is the set of rulesfor exchanging files (text, graphic images, sound, video, andother multimedia files) on the web. The HTTP protocol runs ontop of the TCP/IP suite of protocols.Hub - A (network) hub is used to connect multiple devices tothe network. The hub transmits all data to all devicesconnected to it, whereas a switch will only transmit the data tothe device it is specifically intended for.Image compression - Image compression minimizes the filesize (in bytes) of an image. Two of the most commoncompressed image formats are JPEG and GIF.Interlacing - Interlaced video is video captured at 50 pictures(known as fields) per second, of which every 2 consecutivefields (at half height) are then combined into 1 frame.Interlacing was developed many years ago for the analog TVworld and is still used widely today. It provides good resultswhen viewing motion in standard TV pictures, although there isalways some degree of distortion in the image.To view interlaced video on e.g. a computer monitor, the videomust first be de-interlaced, to produce progressive video, whichconsists of complete images, one after the other, at 25 framesper second. See also Progressive scan.IP (Internet Protocol) - The Internet Protocol is a methodtransmitting data over a network. Data to be sent is dividedinto individual and completely independent "packets." Eachcomputer (or host) on the Internet has at least one address that