[ntp:questions] National time standard differences

Richard B. Gilbert rgilbert88 at comcast.net
Tue Feb 9 15:04:06 UTC 2010


cc wrote:
> 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

AFAIK, there is no way to be sure!  What is certain is that using 
sources that distant from your site leaves plenty of room for error!

I try to use sources within 300 miles or less.  My home system uses a 
GPS receiver as its primary source.  This will work in most "reasonable" 
locations!  It also provides extremely good accuracy!




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