[ntp:questions] GPS_NEMA, but high offset and jitter?
unruh
unruh at wormhole.physics.ubc.ca
Mon Feb 22 21:51:18 UTC 2010
On 2010-02-22, Kelsey Cummings <kgc at sonic.net> wrote:
> FreeBSD 8.0, with built in ntpd (4.2.4p5) and PPS_SYNC enabled with a
> Garmic 18LVC.
>
> Using the following options:
>
> server 127.127.20.1 mode 0 minpoll 4 maxpoll 4 prefer
> fudge 127.127.20.1 flag1 1 flag3 1 refid GPS
> server 0.pool.ntp.org iburst maxpoll 9
> server 1.pool.ntp.org iburst maxpoll 9
> server 2.pool.ntp.org iburst maxpoll 9
> server 3.pool.ntp.org iburst maxpoll 9
>
> Is resulting in:
>
> remote refid st t when poll reach delay offset
> jitter
>==============================================================================
> GPS_NMEA(1) .GPS. 0 l 66h 16 0 0.000 -192.53
> 27.455
> *216.45.57.38 209.81.9.7 2 u 469 512 377 11.990 2.871
> 0.449
> -tantalum.srvcs. 192.43.244.18 2 u 336 512 377 76.924 -29.311
> 2.300
> +208.96.18.74.se 199.212.17.35 3 u 339 512 377 4.792 4.906
> 1.466
> +mirror 204.9.54.119 2 u 283 512 377 86.562 9.086
> 2.488
>
> The -192.52 and 27.455 stats for the GPS have been constant for 72+
> hours now. Any suggestions as to what the problem could be?
Your system is not receiving any timing data from the GPS (reach 0).
It is relying on the other sources.
>
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