Stephen Wille Padnos wrote: > You might be able to "fix" the problem by using USB2 hi-speed cables. > USB2 cables are shielded, USB1 may not be. Also, check the cable on the > actual device - it may have a bad (or no) shield connection inside the > controller. > Unlike Ethernet, USB (all USB) is not isolated, as they can power the target device from the host. They use some DC tricks on the data lines to identify device types, too, that precludes the transformers. Especially if the USB device is connected to other equipment then the possibility of interference gets even worse, but just long cables and EMI will always have potential for interaction. It may be that moving the USB cables away from or at right angles instead of parallel to other cables may help. If the hub is powered, then the interference may be coming in on the "wall wart" power supply and cable. Much of this consumer-grade gear is not properly tested for EMC (electro magnetic compatibility) and would fail such testing miserably.
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
