Bosch DHR-1600A-150A CCTV Glossary - Page 9

Camera, DVR, and VIP products Glossary of CCTV Terms | en 9 Multimode Fiber Multi-Protocol NEMA Rating Net mask NightSense NPT NTP OSD Pan Parameters Pixel Port An optical fiber with a larger core (typically 50 or 62.5 microns) than singlemode fiber (see Singlemode Fiber). The core is made of plastic or glass fibers. It is the most commonly used fiber for cabling short distances as used in LANs. The name multimode comes from the fact that light rays travel down multiple reflective paths (modes) within the fiber. This allows light to enter the core at different angles, making it easier to connect to broader light sources such as LEDs (light emitting diodes). Fiber optic interfaces and multimode fiber-based transmission systems are less expensive than those based on singlemode fiber. However, the use of multiple reflective paths (modes) increases modal dispersion (see Modal Dispersion) and shortens the distances that this type of fiber optic transmission system can span. A convention or standard that controls or enables the connection, communication, and data transfer between two devices. In PTZ cameras, such as the AutoDome and Pan/Tilt units, protocol refers to the standard used to control the pan, tilt, and zoom (PTZ) operation of the camera. Since each camera manufacturer's PTZ protocols are unique, multi-protocol support is needed to support third party systems. AutoDome cameras support the Pelco D and P protocols as well as Bosch's own Biphase protocol (see Biphase). The Pan/Tilt units support the Pelco "D" protocol as well as Bosch's own Biphase and Bilinx protocols (see Bilinx). N Electrical Standards and Publications published by NEMA (National Electrical Manufacturers Association). Specification standards in reference to the operating environment for a variety of electrical devices. A mask that explains which part of an IP address is the network address and which part is the host address. It is usually written in dotted decimal notation, for example 255.255.255.192 (see also Subnet Mask). A method of boosting the sensitivity of high-resolution Bosch color cameras by 9 db (a factor of 3) by combining the signal of the color image in a single monochrome picture. National Pipe Thread: A U.S. standard for tapered threads. NPT sizes measure the nominal inside diameter of the pipe. NPT threads form a seal as the threads compress against each other. Network Time Protocol: A standard for synchronizing computer system clocks via packetbased communication networks. NTP uses the connectionless network protocol UDP (see UDP). This was developed specifically for enabling time to be reliably transmitted over networks with variable packet runtime (Ping). O On-screen Display: Menus are shown on the display monitor. P Camera movement in the horizontal direction. Values used for configuration. The smallest addressable unit on a display screen or bitmapped image. 1) On computer and telecommunication devices, a port (noun) is generally a specific place for being physically connected to some other device, usually with a socket and plug of some kind. Bosch Security Systems Glossary of CCTV Terms AR18-08-B000 | | Version 1.0 | 2008.08