[ntp:hackers] Reduce jitter of refclocks (connected via USB)
David J Taylor
david-taylor at blueyonder.co.uk
Tue Mar 15 06:26:23 UTC 2011
> USB by design operates with a 1 ms polling interval, so this is exactly
> the jitter you should get, best case.
I once did some casual checks of running NTP with a GPS/PPS source over a
serial to USB converter, and got the results here:
Jitter was in the region of 50 microseconds (Windows XP SP3). Not quite
sure how that tallies with a 1 ms polling interval.
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Email: david-taylor at blueyonder.co.uk
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