USB uses differential signaling, D- and D+ signal lines. Since it?s differential, is absolute polarity important? If, for example, I mix up the two conductors on a USB device I?m rewiring, is this critical?
Just curious?
Thanks, Dave
USB uses differential signaling, D- and D+ signal lines. Since it?s differential, is absolute polarity important? If, for example, I mix up the two conductors on a USB device I?m rewiring, is this critical?
Just curious?
Thanks, Dave
Yes it's imperative you get it right
Of *course* it is! Do you think you can replace every '0' with a '1' and still get the same *meaning*?
Yes.
because it's differential doiong that would make a "1" look like a "0" and a "0" look like a "1", that seems unlikely to end well unless USB has been designed to detect and compensate for this fault.
On Sat, 08 Aug 2015 08:53:14 +0100, TTman Gave us:
Yes. ALL FOUR conductors, not just the signal pair.
Two are power. Does it make sense to you that reversing those would be OK?
Or mixing any from each set?
Yes. A - B is different from B - A.
On 8 Aug 2015, Tim Wescott wrote
Thanks Tim. That explains it.
Well why the hell not? Wifi manages to sort them out... :^)
(Radio encodings not having the advantage of DC and phase correct installations, of course, so they have to make do when they're doing PSK modulations.)
Tim
On Sun, 9 Aug 2015 01:49:30 -0500, "Tim Williams" Gave us:
Make dew. Hahahahaha!
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.