Bosch DHR-1600A-150A CCTV Glossary - Page 6

6 en | Glossary of CCTV Terms Camera, DVR, and VIP products F F-Number The standard measure of the lens aperture, which is the iris diameter, divided by the focal length of the lens. The lower the maximum aperture (F-Number or F-Stop), the more light that passes through the lens. F-Stop See F-Number Fast Address A system for setting the address of the camera remotely from the control system. Fiber Optic Transmission Refers to the transmission of video and data via optical fibers. Optical fibers are thin glass strands that are designed for light wave transmission. Video and data are digitized and transformed into a series of light pulses. There are two primary types of optical fiber; singlemode and multimode. Singlemode fiber is used when large distances must be spanned, typically greater than 2 Km/1.2 miles (see Singlemode). Multimode is typically used to span smaller distances such as the inside of buildings or on small campuses (see Multimode). Field of View The measure of the visible area within the camera's field of view. The larger the focal length, the smaller the field of view. The smaller the focal length, the wider the field of view. FlexiDome Fixed compact cameras in surveillance domes with economical, indoor models and highperformance, vandal resistant styles. Focal Length The distance from the optical center of the lens to the image of an object located at an infinite distance from the lens. Long focal lengths give a small field of view (e.g. telephoto effect), while short focal lengths give a wide angle view. FTP File Transfer Protocol: Used to transfer files between computers on a network, such as the Internet. Full duplex Simultaneous data transmission in both directions (sending and receiving); (see Duplex). Frame A single video image. Frame rate See IPS Gateway Address GBIC GoP Guard Tour G A node on a network that serves as an entrance to another network. GigaBit Interface Converter: Applied in network technology to render interfaces flexible, i.e. converting an electrical interface into an optical interface. This enables flexible operation of an interface as a Gigabit Ethernet via twisted-pair cables or fiber optic cables. Group of Pictures: In MPEG video encoding, a group of pictures, or GoP, specifies the order in which intra-frames and inter-frames are arranged. Allows recorded tours with a combined duration of 15 minutes. Recorded tours consist of control commands and can be played back as needed. All camera position information is stored for maximum flexibility (including pan, tilt, zoom, etc.). HTTP HTTPS H Hypertext Transfer Protocol: Protocol for transmitting data over a network. Hypertext Transfer Protocol Secure: Encrypts and authenticates communication between Web server and browser. AR18-08-B000 | | Version 1.0 | 2008.08 Glossary of CCTV Terms Bosch Security Systems