[ntp:questions] 500ppm - is it too small?
David J Taylor
david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Wed Aug 19 10:07:21 UTC 2009
"Harlan Stenn" <stenn at ntp.org> wrote in message
news:ywn9r5v87mp3.fsf at ntp1.isc.org...
>>>> In article <ywn9ab1xrquz.fsf at ntp1.isc.org>, Harlan Stenn
>>>> <stenn at ntp.org> writes:
>
>>>> In article <h6dh6d$rgi$1 at walton.maths.tcd.ie>, dwmalone at maths.tcd.ie
>>>> (David Malone) writes:
> David> Indeed - to push us back on track a little, here's a graph of the
> David> drift values from a few hundred machines:
>
> David> http://www.maths.tcd.ie/~dwmalone/time/drifts.png
>
> Harlan> Again, drift values are about the clock's *time*, and the 500ppm
> Harlan> slew limit is about the clock's *frequency*.
>
> I was, of course, insane when I wrote that. I misread and thought that
> offsets were being plotted, not drift file values (which are, indeed,
> the
> ppm frequency offsets).
>
> --
> Harlan Stenn <stenn at ntp.org>
> http://ntpforum.isc.org - be a member!
David's graph changed my view - from "is 500ppm too small?" to "500ppm is
not an unreasonable value". My thanks to all who have contributed.
Cheers,
David
More information about the questions
mailing list