30 Dec
2016
30 Dec
'16
7:12 a.m.
Ralf Mardorf wrote:
Saw + pincers = ferrite core removed = no xruns anymore
Thank you for doing the experiment.
>2) Unfortunately, USB is inherently noisy. Using a
ferrite to reduce
>common-mode currents in the cable is, in principle, a good idea.
Using a common-mode choke works only for differential signals.
But USB also uses common-mode signalling for certain states.
Ferrites on a USB cable should be one per data line, and sized so that
only frequencies higher than the USB signalling rate are filtered out.
I would guess that that cable was (originally) intended for low speed only.
Regards,
Clemens