Got a 25 footer from A/V electronics. It was the DVI and the proprietary cord used to talk between the media box and plasma monitor. (i.e. color settings, set-up menu etc....) Apparently you don't want to go longer than 25 feet. But all I needed was about 25 feet. Now I can put my electronics elsewhere far from the Plasma monitor. (at least 25 feet away) all with the cords in the wall/cieling.
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Pat