Stephen Wille Padnos wrote: > > The shield is only required for USB2 cables. In the interest of saving > a milli-cent, it's probably left out on anything that it isn't needed > for, such as a very low speed game controller (which probably doesn't > even need USB 1.1 speed, let alone USB2). > Hmmm, I guess if you don't care if the FCC has your head on a platter (which the Chinese knockoff artists wouldn't care) then you can do that. Since the cable COULD be plugged into a USB2 port, and the drivers will have the super-fast edge rates even when sending at 1.5 KBits/second (low speed), I think it would still be a powerful radiator, and flunk even class A tests. At "full speed" 12 Kbits/second, it is just illegal, as the limit is no clock whatsoever can be above 9 KHz.
I have no idea what sort of schlock the Chinese are pumping out, I can only imagine some of the consumer-grade stuff at Micro-Center is so awful it will barely work in the best environment. Losing control of a CNC system is potentially dangerous, so I'd just avoid anything that has any potential for connection problems. Jon ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
