[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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