[ntp:questions] root vs peer dispersion?
towli at oldboyz.dk
Wed May 6 22:39:32 UTC 2009
I appreciate your time David.
"David Woolley" <david at ex.djwhome.demon.co.uk.invalid> skrev i meddelelsen
news:49ff2919$0$516$5a6aecb4 at news.aaisp.net.uk...
> Towli wrote:
>> why is the root dispertion not "0" when the Dcf77-clock is sitting on
>> port 20 on the switch? is 5.45 the time the Dcf77-signal takes to travel
>> from Frankfurt to Denmark where i am located? What then does the peer
>> dispersion time of 2.84 msec tell me?
> - the DCF 77 time wasn't read immediately before you requested the time
> from NTP, so the time could have drifted since then.
> - I'm not sure, but I think that the best sample might not be the most
> - there is an uncertainty in reading the clock due to the finite
> resolution of the clock;
> - I think there may be an element of the historic variability thrown in;
> - using too low a root dispersion means the error band is very small, so
> it only needs a small error to make it impossible to get overlapping error
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