Once upon a time, Fred Smith <fredex@xxxxxxxxxxxxxxxxxxxxxx> said: > It IS USB, and one caveat is that it doesn't work well (or at all) if you > use a very long USB cable. The provided cable works, though may not be > long enough, depending on where/how youwant to place it. It also works > with an extension cable of 4-5 feet. but if you add on a ten foot cable, > you can kiss it goodbye. > > some googling informed me that the max recommended cable lengths for > USB devices is based not on signal degradation over the length of the > wires, but on signal timing,... the timings are so tight that the > speed of light is the causative element for max cable lengths. I doubt that timing is the problem. The speed of signal propagation through a copper wire is IIRC around .5c, so the delay added by an additional 4 feet of cable is only about 8ns. Timings on USB are measure in µs; a few ns is not going to make a difference. Much more likely is that you are talking about a USB bus-powered device and the voltage drop across your cable was too high, so the device didn't get enough power. This is a common problem with cheap USB cables. If you use a USB cable with larger-gauge wire, you should be fine. -- Chris Adams <linux@xxxxxxxxxxx> -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
