AV Technology - January 2009 - (Page 32)

ation and crosstalk at the 340 MHz clock rate, regular DVI and HDMI implementations at distances to 100 meters are possible. Our current experience shows we can transport DVI or HDMI on 26 AWG Cat 7 STP to about 200 feet. With 22 AWG STP cable, we have transported DVI and HDMI a full 100 meters, or 328 feet. OH, YES, THE CONNECTORS Just as connection systems play an important role in network systems bandwidth, they are no less important for transporting DVI and HDMI data. From the previous review on signaling rates for these video interfaces, it’s obvious that the selection of RJ-45 modular connectors will impact electrical losses. The standard RJ-45 connector contributes additional crosstalk between data pairs by virtue of its construction. A new connector system was recently adopted for Category 7, or ISO Class F, service. Network cabling manufacturer Siemon offers the new TERA connector to support 600 MHz and above. The TERA connection system provides significant isolation between data pairs with radically different construction. Crosstalk budget greatly exceeds that of Category 6 (or Class E) service. The TERA connector will support us into 10 gigabit Ethernet. The TERA connection system along with 22 AWG shielded twisted- pair cable supports Category 1 DVI and HDMI data rates up to 100 meters with significant headroom. If you find yourself in a situation where you need some additional distance with existing extender systems, using Cat 7-style STP cable will reduce crosstalk significantly and perhaps provide the distance boost you need. Try substituting it for only the primary video/audio data cable between the transmitter and receiver. CAT WITH AT LEAST 9 LIVES Despite advances in both fiber optic and wireless technologies, copper cabling will likely be with us for some time to come. During research for this article, I uncovered discussions on Category 8 proposals, which solidly identify 1.2 GHz as the next step in network data rates over twisted-pair cable. How about Cat 9? Does this Cat have more than nine lives? With improvements in digital data interfaces and connectors, the future of copper cabling remains very bright indeed. Steve Somers is vice president of engineering with Extron Electronics and an Adjunct Faculty member of the InfoComm Academy. Got a comment? Contact us at AVT@nbmedia.com, and type the title of this article into the subject header. *Print version is FREE to qualified USA residents only. Publisher reserves the right to determine subscription eligibility. Digital version is available FREE to all USA and International residents. http://www.myavtechmag.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

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