[ntp:questions] Which time source is ntp using
Brian Utterback
brian.utterback at oracle.com
Wed Jul 12 15:37:46 UTC 2017
Strictly speaking, it is using both. A PPS signal can only be used on a
system clock that is within half a second of the correct time. In
essence the part of the timestamp that is of a precision of one second
and up is coming from the 176.9.72.17 system, while the part of the
timestamp that is in fractions of a second is coming from the PPS.
Hope that helps.
On 7/11/2017 10:53 PM, Chip wrote:
> All,
>
> I have set up a raspberry pi as a NTP server.
>
> The Pi is performing flawlessly.
>
> when I run the ntp -pn, I get the following output
>
> remote refid st t when poll reach delay offset
> jitter
> ==============================================================================
>
> 127.127.1.0 .LOCL. 10 l 27h 64 0 0.000 0.000 0.000
> o127.127.20.0 .GPS. 0 l 58 64 377 0.000 0.007 0.004
> *176.9.72.17 192.53.103.104 2 u 44 64 377 136.644 1.221
> 0.720
> +46.254.216.9 89.109.251.21 2 u 58 64 337 177.067 0.041
> 2.734
> -69.10.161.7 144.111.222.81 3 u 36 64 377 69.135 15.589
> 0.680
> +96.244.96.19 192.168.10.254 2 u 46 64 377 58.373 0.809 13.308
>
> Is the pi using the GPS pps signal as the reference clock or the clock
> at 176.9.72.17 which has
> the * infront of it?
>
> Thanks
>
>
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