TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 75

The Fiber Optics Illustrated Dictionary - Part 75 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary away at full speed. 2. The tendency to continue a signal echo electrical charge or data transmission after the actual communication has ceased or the message part has been received. 3. In a phosphor display system the tendency of the phosphors to continue to fluoresce after the stimulus has stopped. This may be an undesired property causing smear or may be a desired property enabling the image to remain viewable while the rest of the frame is being imaged persistence of vision A phrase that describes the way in which human visual perception holds an image for a brief moment about a tenth of a second even if the objects in the visual field have changed or moved. Thus humans can only scan or perceive still images up to a speed of about 24 to 60 frames per second. Faster than that and they are no longer seen as still images but as a series of moving or related images especially if the forms in the images are closely related to the previous ones. Researchers Muensterberg and Wertheimer demonstrated in the early 1900s that this was a property of brain processing and perception more than a physical property of the retina. These characteristics of visual perception have greatly influenced the design and development of moving visual communications technologies. See frame scan lines. Personal Communication Network PCN. See Global System for Mobile Communications for the background and technology base for PCN. PCN was developed starting in the late 1980s as a modified form of GSM operating in the 1800-MHz frequency band GSM is 900 MHz . It has smaller cell sizes requires lower power and is optimized to handle higher density traffic than GSM but otherwise is essentially the same. The PCN standard was finalized in 1991. It is primarily used in the United Kingdom. See Global System for Mobile Communications. Personal Communications Service. PCS. A low-power higher frequency standards-based wireless mobile communications system operating in .

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