[ntp:questions] NTP architecture recommendation

David J Taylor david-taylor at blueyonder.not-this-bit.nor-this-bit.co.uk
Sat Aug 18 07:13:04 UTC 2007

Hal Murray wrote:
>> Does anyone know what the comparative GPS timing accuracies are in
>> "precision" and "degraded" modes?
>  http://www.leapsecond.com/pages/saoff/
>  http://www.niceties.com/atomic.html
>> My feeling is that even "degraded" would still be within the
>> microsecond.....
> The graphs in the above URLs used gear with a very good local
> oscillator so they could average over a long time period.
> I'm not sure what you would get from a typical inexpensive GPS
> reveiver.  I'd be impressed if you could measure the difference
> with a typical NTP setup.

So from 20ns to 6.3ns.  About 1/1000 of what I would worry about.

Thanks, Hal.


More information about the questions mailing list