Bosch DHR-1600A-150A CCTV Glossary - Page 8

8 en | Glossary of CCTV Terms Camera, DVR, and VIP products iSCSI ISDN Internet Small Computer System Interface: Protocol that manages storage via a TCP/IP network. iSCSI enables access to stored data from everywhere in the network. Integrated Services Digital Network: Comprised of digital telephony and data-transport services offered by regional telephone carriers. ISDN involves the digitization of the telephone network, which permits voice, data, text, graphics, music, video, and other source material to be transmitted over existing telephone wires. JPEG J Joint Photographic Experts Group: The name of the committee that created a standard for encoding still images. kBit/s K Kilobits per second: The actual data rate. LAN LUN Lux L Local Area Network: A communications network serving users within a limited geographical area, such as a building or a university campus. It is controlled by a network operating system and uses a transfer protocol. Logical Unit Number: Logical drive in iSCSI storage systems. The International System Unit (see SI) of measurement of the intensity of light. It is equal to the illumination of a surface one meter away from a single candle. MAC MIB MJPEG Modal Dispersion MPEG-4 M Media Access Control: A quasi-unique identifier attached to most network adapters (NICs). It is a number that acts like a name for a particular network adapter. Management Information Base: A collection of information for remote servicing using the SNMP protocol. Motion JPEG is a digital video encoding standard where each video frame is separately compressed into a JPEG image. A broadening of a waveform over long distances. Modal Dispersion (or Intermodal Dispersion) occurs in multimode fibers, because light is bounced down different reflective paths (e.g. modes) in the fiber. As the distance increases, the path (mode) begins to spread and the arrival time for the different light rays begins to vary. A large variance (dispersion) increases the chance that the optical receiver may interpret the incoming signals incorrectly. Modal dispersion is a major problem with multimode fibers. A further development of MPEG-2 designed for transmitting audiovisual data at very low transfer rates (for example over the Internet). A digital video encoding and compression standard that uses interframe encoding to significantly reduce the size of the video stream being transmitted. With interframe coding, a video sequence is made up of keyframes that contain the entire image. In between the keyframes are delta frames, which are encoded with only the incremental differences. This often provides substantial compression because in many motion sequences, only a small percentage of the pixels are actually different from one frame to another. AR18-08-B000 | | Version 1.0 | 2008.08 Glossary of CCTV Terms Bosch Security Systems