AV Technology - January 2009 - (Page 43) avassets product spotlight matter of soldering BNC or VGA connectors to the wire and then connecting equipment together. A special type of signal (differential analog) is used to make the best use of UTP wire, in spite of its limitations. To transmit video over UTP, a special transmitter is needed to convert the video to a differential analog signal that is a better match for UTP wire. At the receiving end, a receiver is needed to convert the differential analog signal back to a usable video signal. And it’s not just for video, either. Digital audio networks, using either proprietary protocols or licensed ones like CobraNet or EtherSound, commonly use Cat 5 cabling and RJ-45 connectors for signal LAN applications. The twist ratio difference cuts down on the crosstalk in bi-directional data communication. But for video signal transmission, this presents a challenge. In AV, virtually all RGB or RGBHV video over UTP systems transmit each color component over its own dedicated twisted pair, therefore three pairs are used for the transmission of color (R,G, and B). The fourth pair can be used for other purposes such as phantom power, audio, data, serial port, keyboard/mouse, etc. Since the twist rates of each pair is different, each color component arrives at different times, causing skew errors. How do you avoid skew? One way is to use so-called “skew-free cable,” in which the length of each twisted pair is uniform, so the R,G,B signals arrive at the receiver simultaneously. The other way is to be sure that the system you use has skew-compensation circuitry that allows adjustment (delay) of various signal components according to the length of your specific cable run. Sources: Extron, Hall Research Technologies, Magenta Research. transmission. “Category” UTP cables are specified by TIA standards documents, and are constructed using four twisted pairs. In all standard cables, the twist rate (number of twists per inch) is different among the various pairs inside the cable. This is an intentional design feature of these cables since they were originally developed for http://crwww.com http://crwww.com
Table of Contents Feed for the Digital Edition of AV Technology - January 2009 AV Technology - January 2009 Contents Precedent Corporate: Hunkering Down Government: The Great Unifier Education: Technological Self-Sufficiency Integrating Communications into Your Business Process DVI/HDMI Signals over Twisted-Pair Cable AV Helps Explain the Unexplainable AV Enhancements at the Coliseum Product Forum Tech Horizons Product Spotlight New Products Ad Index AV MO AV Technology - January 2009 AV Technology - January 2009 - AV Technology - January 2009 (Page Cover1) AV Technology - January 2009 - AV Technology - January 2009 (Page Cover2) AV Technology - January 2009 - Contents (Page 3) AV Technology - January 2009 - Contents (Page 4) AV Technology - January 2009 - Contents (Page 5) AV Technology - January 2009 - Contents (Page 6) AV Technology - January 2009 - Contents (Page 7) AV Technology - January 2009 - Precedent (Page 8) AV Technology - January 2009 - Precedent (Page 9) AV Technology - January 2009 - Precedent (Page 10) AV Technology - January 2009 - Precedent (Page 11) AV Technology - January 2009 - Precedent (Page 12) AV Technology - January 2009 - Precedent (Page 13) AV Technology - January 2009 - Precedent (Page 14) AV Technology - January 2009 - Precedent (Page 15) AV Technology - January 2009 - Corporate: Hunkering Down (Page 16) AV Technology - January 2009 - Corporate: Hunkering Down (Page 17) AV Technology - January 2009 - Government: The Great Unifier (Page 18) AV Technology - January 2009 - Government: The Great Unifier (Page 19) AV Technology - January 2009 - Education: Technological Self-Sufficiency (Page 20) AV Technology - January 2009 - Education: Technological Self-Sufficiency (Page 21) AV Technology - January 2009 - Integrating Communications into Your Business Process (Page 22) AV Technology - January 2009 - Integrating Communications into Your Business Process (Page 23) AV Technology - January 2009 - Integrating Communications into Your Business Process (Page 24) AV Technology - January 2009 - Integrating Communications into Your Business Process (Page 25) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 26) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 27) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 28) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 29) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 30) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 31) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 32) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 33) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 34) AV Technology - January 2009 - DVI/HDMI Signals over Twisted-Pair Cable (Page 35) AV Technology - January 2009 - AV Helps Explain the Unexplainable (Page 36) AV Technology - January 2009 - AV Helps Explain the Unexplainable (Page 37) AV Technology - January 2009 - AV Enhancements at the Coliseum (Page 38) AV Technology - January 2009 - AV Enhancements at the Coliseum (Page 39) AV Technology - January 2009 - Product Forum (Page 40) AV Technology - January 2009 - Tech Horizons (Page 41) AV Technology - January 2009 - Product Spotlight (Page 42) AV Technology - January 2009 - Product Spotlight (Page 43) AV Technology - January 2009 - New Products (Page 44) AV Technology - January 2009 - New Products (Page 45) AV Technology - January 2009 - New Products (Page 46) AV Technology - January 2009 - New Products (Page 47) AV Technology - January 2009 - New Products (Page 48) AV Technology - January 2009 - Ad Index (Page 49) AV Technology - January 2009 - AV MO (Page 50) AV Technology - January 2009 - AV MO (Page Cover3) AV Technology - January 2009 - AV MO (Page Cover4)
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