[ntp:questions] Resolution and Precision

mills at udel.edu mills at udel.edu
Thu Feb 15 10:48:56 UTC 2007


David,

You quoth ancient history. That was fifteen years ago and time has 
marched onward. The present definitions of resolution and precision were 
refined over many years of use and practice and very carefully sorted 
out in the NTPv4 spec.

Dave

David J Taylor wrote:

> mills at udel.edu wrote:
> 
>>David,
>>
>>RFC 1305 was the seat of furious controversy. I consider the only
>>authorative document is in PostScript, later in PDF. The IETF and I
>>have engaged in serious disagreement on PDF formats as against Postel
>>ASCII. Everything, and I mean everything today is in PDF - Governent
>>documents and forms, University documents and forms, IEEE standards,
>>ACM and IEEE publications and everything else I do is in PDF. So,
>>what you see is what you get. The PDF of RFC 1305 is on the NTP
>>project page.
>>Dave
> 
> 
> Thanks, Dave.
> 
> I see that reference 25 points to:
>   Abstract: 
> http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305a.pdf
>   Body: http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305b.pdf
>   Appendices: 
> http://www.eecis.udel.edu/~mills/database/rfc/rfc1305/rfc1305c.pdf
> 
> On page 11 of the body, the word "precision" is used in the context where 
> I would use "resolution".  It isn't used in the sense of "how close to the 
> correct time is this clock", which I might call accuracy.  Perhaps it 
> would be helpful to have these terms defined somewhere?  Perhaps the terms 
> are used differently by different cultures, even!
> 
> Cheers,
> David 
> 
> 




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