On Wed, Mar 24, 2010 at 4:09 PM, David Ross <[email protected]> wrote:
> Since HDMI is pure digital, cable quality is something of a misnomer. >> Digital is pretty much on/off, so it either works or does not. At the shows >> there are cheap HDMI cables, sometimes as low as $6.00 >> They work >> > They don't always, of course. > > ... > > For analog cables (like VGA) all bets are off. I use high-resolution > projectors a lot, and have encountered many long cheap cables that work OK > at 800x600 but are essentially useless at 1280x768. > > David > > Correct. While digital signals are on/off, when you get to Multi-Ghz signal speeds, you need to recognize that all signals are analog to a point, they're just representation of digital numbers. In Digital, the cable only needs to be good-enough to pass the signal correctly. I have seen distortion in digital cables, though - If the cable has the wrong characteristic impedance causing signal reflections, it can mess up some bit patterns and not others. Just hope the error-recovery in the protocol covers it. On the other hand, a somewhat-cheap cable that works consistently is just as good as a 6-foot MonsterCable HDMI cable for $60. _______________________________________________ Thinkpad mailing list [email protected] http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
