[ntpwg] ntpwg Updated NTPv4 Protocol Specification/timestamp location

David L. Mills mills at udel.edu
Thu Feb 7 02:55:56 UTC 2008


Stuart,

I try again.

Let t1, t4 belong to A and t2, t3 belong to B. From A's point of view, 
t2 is late by D and t3 is late by D. Prestatus equationatus.

Dave

STUART VENTERS wrote:

> Dave,
>
>>> In the famous equation you cite, add one second on the path from t1 to
>>> t2 and a corresponding second on the path from t3 to t4. The additional
>>> second cancels out. offset = {[(t2 + D) - t1] + [t3 - (t4 + D)]} / 2
>>
>
> That does not compute.
> In your equation, D delays the receive timestamps (T2 and T4)
> In the example, D delays Sue's timestamps (T1 and T4)
>
> I fear the question stack has pushed too deep to ever pop out to the 
> original goal.
> (IE. Understanding why CP1 and CP2 are (or are not) a necessary part 
> of the spec.)
>
> 73's,
>
> Stuart
> -.-. .-. -
>
>
> ps, If anyone would like to call and help me understand, my office 
> phone number is (256) 963-8719.




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