Additional Information ǀ
MPEG (Motion Picture Experts Group): An ISO group of experts that has recommended manipulation of digital motion images. Today there are a couple of MPEG recommendations, of which the most well known are MPEG-1 and MPEG-2. The latter one is widely accepted for high definition digital television, as well as multimedia presentation.
Network: Computers connected together to share information. Think of a network as a city and the computers as houses within the city. Two types of networks are LAN and WAN.
(1) LAN: Local Area Network; multiple computers connected together to share information. Shared information could be e-mail, files, and printers. Think of a LAN as a neighborhood.
(2) WAN: Wide Area Network; multiple LANs connected together, usually over a great distance, to share information. Think of a WAN as all neighborhoods in a city.
Noise: Typically low-level electrical distortions and interference created in an electronic component from power supply hum, interactions between internal electrical components, etc.
NTSC (National Television System Committee): Is an organization that formulated the standards for the current United States color television system. This system is used in most countries of the Americas, as well as other parts of the world. It was designed to be compatible with existing monochrome TV sets so they would not become obsolete and color televisions would also be able to receive monochrome transmissions. NTSC employs 525 lines per frame, 29.97 frames per second and 59.94 fields per second.
Passive: A non-powered element of a system.
Pan & Tilt: A device upon which a camera can be mounted that allows movement in both the azimuth (pan) and in the vertical plane (tilt).
Peak-to-Peak: The amplitude (voltage) difference between the most positive and the most negative excursions (peaks) of an electrical signal. A full video signal measures one volt peak to peak.
Plenum: Space above the ceiling and below the floor or roof above, used for air distribution or ductwork placement.
Preset Positioning: A function of a pan and tilt unit, including the zoom lens, where a number of certain viewing positions can be stored in the system’s memory (usually this is in the telemetry receiver) and can be recalled when required, either upon an alarm trigger, programmed or manual recall.
Protocol: A specific set of rules, procedures or conventions relating to format and timing of data transmission between two devices. A standard procedure that two data devices must accept and use to be able to understand each other. The protocols for data communications cover such things as framing, error handling, transparency and line control.
Rack Mount: Method of installing video equipment featuring special hardware in a tall closet-like metal frame or rack.
GLOSSARY OF TERMS
RAID (Redundant Array of Inexpensive Disks): This is a technology of connecting a number of hard drives into one mass storage device, which can be used, among other things, for digital recording of video images.
Range Finder: Used to determine the focal length needed and what the picture will look like on the monitor. The user looks through the device and adjusts the range finder to the desired picture. Numbers on the outside of the range finder indicate the focal length needed.
RG-59 Cable: A video coaxial cable with 75 Ohm characteristic impedance. A type of coaxial cable that is most common in use in small to medium-size CCTV systems. It has an outer diameter of approx. 6 mm and it is a good compromise between maximum distances achievable (up to 266m) and good transmission.
RG-6 Cable: A coaxial cable used for broadband video applications with a 20 gauge center conductor, allowing a higher bandwidth then RG59 cable. Uses standard “F” connectors for video equipment connections.
RS232: A format of digital communication using a three wire unbalanced presentation. The RS232 standard defines the presentation and voltages for asynchronous communications, but it does not define how the data should be represented by the bits; i.e., it does not define the overall message format and protocol. It is very often used in computers, CCTV and communications between keyboards and matrix switchers.
RS422: This is an advanced format of digital communication when compared to RS232. A major difference is that the presentation is balanced line and the signaling is differential. In simple terms, the signal transmitted is read at the receiving end as the difference between the two wires without a reference to earth. So if there is common mode noise induced along the line, it will be cancelled out. RS422 can drive lines of up to 1200m and distribute data on to up to 10 receivers.
RS485: This is an advanced format of digital communications compared to RS232. It is a balanced line transmission system. The major improvement over RS422 is in the number of receivers that can be driven with this format, up to 32. It is classically a half duplex 2 wire presentation.
Scene Illumination: The average light level incident upon a monitored area. Normally measured for the visible spectrum with a light meter having a spectral response corresponding closely to that of the human eye and is quoted in lux.
Serial Interface: A digital communications interface in which data are transmitted and received sequentially along a single wire or pair of wires. Common serial interface standards are RS232 and RS422.
Serial Port: A computer I/O (input/output) port through which the computer communicates with the external world. The standard serial port is RS232 based and allows bi-directional communication on a 3-wire connection, as a serial data stream.
Server: A computer and its software that provides some service for other computers connected to it through a network.
Signal-to-Noise Ratio: The ratio between useful video signal and disturbing noise or snow.
TCP/IP (Transmission Control Protocol/Internet Protocol): The internet protocol suite can be described by analogy with the OSI model, which describes the layers of a protocol stack, not all of which correspond well with internet practice. In a protocol stack, each layer solves a set of problems involving the transmission of data, and provides a well-defined service to the higher layers. Higher layers are logically closer to the user and deal with more abstract data, relying on lower layers to translate data into forms that can eventually be physically manipulated.
Twisted Pair: A cable composed of two small insulated conductors twisted together. Since both wires have nearly equal exposure to any interference, common mode noise is high, but the differential noise is slight thus common mode noise is rejected in a twisted pair line. Twisted pair cable is used for balanced line transmission.
UPS (Uninterruptible Power Supply): These are power supplies used in the majority of high security systems, whose purpose is to back up the system when the main power fails.
Vari-Focal: A low cost version of a zoom lens designed to meet installers’ needs for versatility. This lens does not have the ability to track from wide to telephoto.
Video Amplifier: A wideband amplifier used for passing picture signals.
Video Motion Detection: A system that uses the video signal from a camera to determine if there is any movement in the picture and set off an alarm.
Video Type Lens: An Auto Iris lens without an internal circuit to control the iris. All iris control voltages come from a circuit located within the camera.
Zoom Lens: A lens system that may be effectively used as a wide angle, standard or telephoto lens by varying the focal length of the lens.
Zoom Ratio: The ratio of the starting focal length (wide position) to the ending focal length (telephoto position) of a zoom lens. A lens with a 10X zoom ratio will magnify the image at the wide angle end by 10 times.
For ordering information, visit
www.honeywellvideo.com or contact Inside Sales at 1-800-796-2288.
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