On Thu, 28 May 2015, Rong Wang wrote:

> Thanks for this Device side information. But there's one thing I'm
> still not quite sure
> What's the behavior of the USB device when the VBUS is always present
> while the D+/D- differential signal amplitude exceeds the
> disconnection threshold (525 mV)?

I don't think devices monitor the differential signal amplitude.  That 
is, they don't care if it goes above the disconnection threshold; they 
only care if it is > 0 or < 0.

Alan Stern

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