[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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