[ntp:questions] National time standard differences
cjcrickmar at googlemail.com
Tue Feb 9 11:08:43 UTC 2010
On 9 Feb, 10:46, "David J Taylor" <david-tay... at blueyonder.delete-this-
> > I've setup an NTP server in the south east asia region synchonising
> > with regional NTP servers as well as a couple of servers I am
> > responsible for in the US.
> > remote st t when poll reach delay offset jitter
> > ==============================================
> > +Japan 1 u 454 1024 377 87.402 -0.560 0.056
> > *Japan 1 u 476 1024 377 87.277 -0.810 1.542
> > -NorthAmerica 2 u 427 1024 377 285.387 -17.741 5.084
> > -NorthAmerica 2 u 429 1024 377 307.208 -17.061 0.083
> > Is the above delta seen between Japanese and North American time
> > sources purely the delta between the outbound / return network path or
> > something else?
> > Chris
> Most likely asymmetrical paths, yes. To answer your implied question, it
> is most /unlikely/ that the USA National Time is 17 milliseconds away from
> Japan National Time, if that's what you were thinking. National time
> differences are likely to be microseconds or less, I believe.
I wouldn't have thought so either and given that they all trace back
to GPS it isn't likely either but it made me consider the natioanal
security / financial implications of setting your national clock 10ms
ahead of where everyone else thinks it is.
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