[ntp:questions] National time standard differences

David J Taylor david-taylor at blueyonder.delete-this-bit.and-this-part.co.uk.invalid
Tue Feb 9 10:46:32 UTC 2010


> 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

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.

Cheers,
David 




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