Axis 209MFD User Manual

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44AXIS 209MFD/MFD-R/MFD-R M12Glossary of TermsActiveX - A standard that enables software components to interactwith one another in a networked environment, regardless of thelanguage(s) used to create them. Web browsers may come intocontact with ActiveX controls, ActiveX documents, and ActiveXscripts. ActiveX controls are often downloaded and installedautomatically as required.AF (Autofocus) - A system by which the camera lens automaticallyfocuses on a selected part of the subject.Angle - The field of view, relative to a standard lens in a 35mm stillcamera, expressed in degrees, e.g. 30°. For practical purposes, this isthe area that a lens can cover, where the angle of view is determinedby the focal length of the lens. A wide-angle lens has a short focallength and covers a wider angle of view than standard or telephotolenses, which have longer focal lengths.ARP (Address Resolution Protocol) - This protocol is used toassociate an IP address to a hardware MAC address. A request isbroadcast on the local network to discover the MAC address for an IPaddress.ARTPEC (Axis Real Time Picture Encoder) - This chip is used forimage compression.ASIC (Application Specific Integrated Circuit) - A circuit designedfor a specific application, as opposed to a general purpose circuit,such as a microprocessor.Aspect ratio - A ratio of width to height in images. A common aspectratio used for television screens and computer monitors is 4:3.High-definition television (HDTV) uses an aspect ratio of 9:16.Autoiris (or DC-Iris) - This special type of iris is electricallycontrolled by the camera, to automatically regulate the amount oflight allowed to enter.AVI (Audio Video Interleave) - A video format that supportssimultaneous playback of audio and video.Bitmap - A bitmap is a data file representing a rectangular grid ofpixels. It defines a display space and color for each pixel (or “bit”) inthe display space. This type of image is known as a “raster graphic.”GIF's and JPEG's are examples of image file types that containbitmaps.Because a bitmap uses this fixed raster method, it cannot easily berescaled without losing definition. Conversely, a vector graphic imageuses geometrical shapes to represent the image, and can thus bequickly rescaled.Bit rate - The bit rate (in kbit/s or Mbit/s) is often referred to asspeed, but actually defines the number of bits/time unit and notdistance/time unit.Bluetooth - Bluetooth is an open standard for wireless transmissionof voice and data between mobile devices (PCs, handheld computers,telephones and printers).Bonjour - Also known as zero-configuration networking, Bonjourenables devices to automatically discover each other on a network,without having to enter IP addresses or configure DNS servers.Bonjour is a trademark of Apple Computer, Inc.Broadband - In network engineering terms, this describestransmission methods where two or more signals share the samecarrier. In more popular terminology, broadband is taken to meanhigh-speed data transmission.CCD (Charged Coupled Device) - This light-sensitive image deviceused in many digital cameras is a large integrated circuit thatcontains hundreds of thousands of photo-sites (pixels) that convertlight energy into electronic signals. Its size is measured diagonallyand can be 1/4”, 1/3”, 1/2” or 2/3”.CGI (Common Gateway Interface) - A specification forcommunication between a web server and other (CGI) programs. Forexample, a HTML page that contains a form might use a CGI programto process the form data once it is submitted.CIF (Common Intermediate Format) - CIF refers to the analog videoresolutions 352x288 pixels (PAL) and 352x240 pixels (NTSC). Seealso Resolution.Client/Server - Client/server describes the relationship between twocomputer programs in which one program, the client, makes a servicerequest from another program, the server, which fulfils the request.Typically, multiple client programs share the services of a commonserver program. A web browser is a client program that requestsservices (the sending of web pages or files) from a web server.CMOS (Complementary Metal Oxide Semiconductor) - A CMOS is awidely used type of semiconductor that uses both negative andpositive circuits. Since only one of the circuit types is on at any giventime, CMOS chips require less power than chips using just one type oftransistor. CMOS image sensors also allow processing circuits to beincluded on the same chip, an advantage not possible with CCDsensors, which are also much more expensive to produce.Codec - In communications engineering, a codec is usually acoder/decoder. Codecs are used in integrated circuits or chips thatconvert e.g. analog video and audio signals into a digital format fortransmission. The codec also converts received digital signals backinto analog format. A codec uses analog-to-digital conversion anddigital-to-analog conversion in the same chip.Codec can also mean compression/decompression, in which case it isgenerally taken to mean an algorithm or computer program forreducing the size of large files and programs.Compression - See Image Compression.Contrast - Defines the degree of difference between the lightest anddarkest parts of an image or video stream.DC-Iris - This special type of iris is electrically controlled by thecamera, to automatically regulate the amount of light allowed toenter.DHCP (Dynamic Host Configuration Protocol) - DHCP is a protocolthat lets network administrators automate and centrally manage theassignment of Internet Protocol (IP) addresses to network devices in anetwork.DHCP uses the concept of a “lease” or amount of time that a given IPaddress will be valid for a computer. The lease time can vary,depending on how long a user is likely to require the networkconnection at a particular location.DHCP also supports static addresses for e.g. computers running webservers, which need a permanent IP address.DNS (Domain Name System) - DNS is used to locate and translateInternet domain names into IP (Internet Protocol) addresses. Adomain name is a meaningful and easy-to-remember name for anInternet address. For example the domain name www.example.com ismuch easier to remember than 192.0.34.166. The translation tablesfor domain names are contained in Domain name servers.Domain Server - Domains can also be used by organizations whowish to centralize the management of their (Windows) computers.Each user within a domain has an account that usually allows themto log in to and use any computer in the domain, althoughrestrictions may also apply. The domain server is the server thatauthenticates the users on the network.Duplex - See Full-duplex.Ethernet - Ethernet is the most widely installed local area networktechnology. An Ethernet LAN typically uses special grades of twistedpair wires. The most commonly installed Ethernet systems are10BASE-T and 100BASE-T10, which provide transmission speeds upto 10 Mbps and 100 Mbps respectively.ETRAX (Ethernet Token Ring AXIS) - Axis' own microprocessor.Factory default settings - These are the settings that originallyapplied for a device when it was first delivered from the factory. If itshould become necessary to reset a device to its factory defaultsettings, this will, for many devices, completely reset any settings thatwere changed by the user.Firewall - A firewall works as a barrier between networks, e.g.between a Local Area Network and the Internet. The firewall ensuresthat only authorized users are allowed to access the one network from