[ntp:questions] NMEA ref.clock better than my ISP's timeserver?

Richard B. Gilbert rgilbert88 at comcast.net
Thu May 28 11:43:14 UTC 2009

E-Mail Sent to this address will be added to the BlackLists wrote:
> Unruh wrote:
>  > Note that my checking with something in germany is not going
>  >  to give me very good timing. the earth is a large place.
> Isn't the round trip delay calc
>     (Client Destination TS - Client Origin TS)
>   - (Server Transmit TS - Server Receive TS)
>  diff supposed to help compensate for that?

It doesn't "compensate"!  It simply tells you the maximum uncertainty 
introduced in transmitting the request and reply.  You know that it 
can't be worse than one half of the round trip time.  All other things 
being equal, the lowest round trip time gives you the best time.

More information about the questions mailing list