[ntp:questions] Atomized NMEA using second numbering from other server
Dave Hart
hart at ntp.org
Fri Oct 14 19:05:16 UTC 2011
2011/10/14 Miguel Gonçalves <mail at miguelgoncalves.com>:
> Hi Dave!
>
> 2011/10/14 Dave Hart <hart at ntp.org>:
>>> tock# ntpq -p
>>> remote refid st t when poll reach delay offset jitter
>>> ==============================================================================
>>> oGPS_NMEA(0) .GPS. 0 l 6 16 377 0.000 -0.001 0.003
>>> +ntp-p1.obspm.fr .TS-3. 1 u 6 64 377 44.396 0.860 1.342
>>> +ptbtime1.ptb.de .PTB. 1 u 34 64 377 68.039 2.179 0.698
>>> -ntp1.oma.be .PPS. 1 u 43 64 377 52.612 4.312 0.819
>>> *canon.inria.fr .GPSi. 1 u 60 64 377 44.358 1.177 0.902
>>> -ntp1.nl.uu.net .PPS. 1 u 49 64 377 57.991 3.550 0.989
>>
>> The first one is configured with NMEA with PPS enabled. The second
>> one is configured with NMEA with PPS disabled, and also with the
>> PPS/atom driver. I have a system configured similarly to your first,
>> with the only refclock source NMEA with PPS enabled, running
>> 4.2.7p214. It shows the 'o' pps peer tally code for NMEA, and has no
>> association with the * sys peer tally code -- the LAN sources are all
>> marked with + or space tally codes. Are you using "prefer" in the
>> ntp.conf for the first one?
>
> This is the configuration for the first one
>
> # PPS & NMEA
> server 127.127.20.0 mode 18 prefer minpoll 4 maxpoll 4
> fudge 127.127.20.0 flag1 1 flag2 0 flag3 1 time2 0.400
>
> The other machine has
>
> # NMEA only
> server 127.127.20.0 mode 2 prefer minpoll 4 maxpoll 4 iburst
> fudge 127.127.20.0 time2 0.315 flag1 0 flag4 1
>
> # PPS (PPS in kernel)
> server 127.127.22.0 minpoll 4 maxpoll 4
> # This is for kernel PPS
> fudge 127.127.22.0 flag2 0 flag3 1
Those snippets don't completely answer my question about using prefer
in ntp.conf on the first machine -- it could appear on one of the
network sources' server lines. I'm particularly wondering if "server
canon.inria.fr" (possibly among others) uses prefer.
Thanks,
Dave Hart
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