I guess this is mainly a question for Andy, as he's likely pretty up to date on the USB standard. There is a local store here that I've seen USB A-B cables in 25 foot lengths. Now, the packages could be mislabeled, I'm not sure. These are the no name, made in China imported jobbies. These cables would seem to be definately out of spec. They are not powered extensions, they don't have a big enough "hump" on the cable. If I read your post correctly, having a cable that long could damage the drivers, correct? So why would anyone make one that long? Is it possible that it might work? Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams Andrew Warren wrote: > USB cables are limited to 5 meters because that length is short > enough to allow reflections from the far end of the cable to settle > between bits; if a longer cable is used, reflections won't be damped > as well, and the line voltage could rise high enough to cause > physical damage to the drivers. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.