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USB Failure Limits


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#1 PlyPencil

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Posted 27 June 2010 - 05:48 AM

Here is a hypothetical situation, I would like to know what would happen if anyone knows.

I have two devices joined by a USB cable, a computer, and a USB Flash Drive. The USB Is running Full-Speed.
However if there was a delay between the signal being sent and the signal being received, would the device communication fail?
I know that there is a delay, something like 3 nanoseconds. But Im talking about a delay closer to 23 milliseconds.

Would the device still communicate but at a lower speed? Or would communication fail?
Thanks to anyone who answers.



*Edit - Spelling

Edited by PlyPencil, 27 June 2010 - 05:48 AM.


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#2 UpgradeMe

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Posted 27 June 2010 - 02:36 PM

Weird you posted this. I have some music that has been restored from a backup on a USB HD, and I noticed some squelching in a song the other day and thought therre might have been a problem with the backup or the restore or both. I would sure like to know. It even occurred to me that this could go on over a large number of backups and really cause alot of problems. My b/u software has a testing function, but I'm not sure it tests the data...depressing thought...

#3 MadDawg

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Posted 27 June 2010 - 02:47 PM

This may interest you: http://en.wikipedia.org/wiki/USB#Data_packets

EDIT:

This too: http://www.ftdichip.com/Support/Knowledgeb...?usbtimeout.htm

Edited by MadDawg, 27 June 2010 - 02:50 PM.

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