On Thu, Sep 16, 2010 at 11:47 PM, Kai Schaeffer <[email protected]> wrote:
> > > Both are with MESA-7i43 (USB/FPGA) and Servo Drivers. > > The usb cable length could be 1.8m (verified with EMI NOISE testing). > > > > Regarding the USB specification the cable length could be 5m. Have you > tried a longer cable or what is the reason for this limit? Or have you > tried an USB extender to increase it? > > We've tried typical 5m USB cables. It works well under normal conditions. However, it gets unstable if we route it through NOISE source, ex: 750W AC servo drivers. In order to pass the EMI NOISE testing, we need a special USB cable which is immue to those NOISE. And, that cable on my hand happens to be 1.8m :-) Regards, Yishin ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
