[time-nuts] NTP Servers - RPi, NTP-Sec, Teensy 4.1, and one on the way from eBay

[ASSI]

Am Sonntag, 10. Januar 2021, 23:07:02 CET schrieb Ben Hall:
> pi at spy-pi:~ $ ntpq -p
>     remote           refid      st t when poll reach   delay   offset  jitter
>============================================================================== 
>*192.168.4.66    .PPS.            1 u   94 1024  377    0.097    0.320   0.081
>+192.168.4.50    .PPS.            1 u  849 1024  377    0.374    0.371   0.072 
>+192.168.4.57    .PPS.            1 u 1071 1024  377    0.341    0.377   0.114
> 
> So perhaps now the NTP loop has converged?  I'm not sure.

The jitter values look better to me now, although I'd still expect them to be lower by another factor of 2…3 depending on what your network looks like.  The delay values for the last two chimers are in line of what I'd expect, but the Teensy delay is really low still.  It would be interesting to find out if it really responds that fast or if that value is rather the result of an asymmetric delay.  The differences in the displayed offsets seem to indicate that the answer is probably be both.  The offset values should also in general be quite a bit lower, but that depends on how stable the environment is.  While the PLL/FLL is chasing a frequency drift caused by a temperature transient it will produce a residual offset that is roughly proportional to the drift rate.


Regards,
Achim.
-- 
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