[ntp:questions] NTP vs RADclock?

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Thu Jun 7 06:22:40 UTC 2012


David Woolley wrote:
> skillzero at gmail.com wrote:
>
>>
>> 2. Separate offset sync from rate sync. What I wasn't sure about is
>> why the rate sync would be so much more stable than offset sync since
>> they seem to both come from the same packet exchanges. Is the
>> advantage that the rate sync is smoothed over time whereas the offset
>> sync isn't?
>>
> I seem to remember that NTPV3 had a fast loop for phase and a slower
> loop for frequency.

NTPD, not just V3, is a hybrid FLL/PLL, i.e. frequency first, then phase.

Terje

-- 
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"



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