In message <[EMAIL PROTECTED]>, Rob Seaman writes:

>Before somebody else calls me on it, I should point out that NTP
>actually uses both:
>
>        "The clock discipline algorithm functions as a nonlinear, hybrid
>phase/frequency-lock (NHPFL) feedback loop."
>
>(see http://www.cis.udel.edu/~mills/database/brief/clock)

Let me just note that not all of us in the NTP environment belive
that algorithm is optimal or even well understood.

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