[ntp:questions] [ntp:question]Too much offset from GPS?

chowalit.lab Chowalit Lab Linux chowalit.lab at gmail.com
Thu Mar 6 06:55:25 UTC 2008


Dear all
   I have problem with my stratum1 box. My box include: freebsd
5.2-RELEASE without PPS  , ntp-4.2.0_1, Intel Pentium III, 40 G IDE,
Germin GPSmap60 , connect with serial com. In GPSmap60 set as NMEA.
Freebsd box can get NMEA input string. My configuration of ntp.conf
like this:

server 127.127.20.0 mode 1 prefer minpoll 4
server  127.127.1.0 minpoll 5

server 69.25.96.14 minpoll 6
server 192.43.244.18  minpoll 6
server us.pool.ntp.org minpoll 6
server 203.185.69.60  minpoll 6
server 122.154.11.67  minpoll 6


logfile /var/log/ntp
logconfig =all
driftfile /var/log/ntp.drift

   It's look OK. After I start my ntp. And I try to check with "ntpq
-p", result like this

    remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*GPS_NMEA(0)     .GPS.            0 l    -   16    3    0.000   -7.127   7.982
 LOCAL(0)        73.78.73.84      5 l   22   32    1    0.000    0.000   0.002
 time.symmetrico .GPS.            1 u   21   64    1  248.084  167.016   0.002
 time.nist.gov   .ACTS.           1 u   20   64    1  273.165  156.541   0.002
 andromeda.cs.pu .CDMA.           1 u   19   64    1  295.742  157.582   0.002
 203.185.69.60   .PPS.            1 u   18   64    1  270.912  292.165   0.002
 122.154.11.67   .INIT.          16 u    -   64    0    0.000    0.000 4000.00


  My GPS have offset lower than other stratum 1 server ?? .......
Please help me.


Thanks you
Chowalit



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