[ntp:questions] Is the time from the GPS receiver bad ?
Eugen COCA
ecoca at eed.usv.ro
Sun Sep 10 18:58:26 UTC 2006
>From time to time the ntpq -pe output from my servers looks like this:
remote refid st t when poll reach delay offset
jitter
==============================================================================
+GPS_NMEA(1) .GPS. 0 l 52 64 377 0.000 0.000
0.004
ptbtime1.ptb.de .PTB. 1 u 75 256 377 155.060 -48.458
35.782
ntps1-1.cs.tu-b .PPS. 1 u 91 256 377 151.487 -47.099
1.731
ntp-p1.obspm.fr .1PPS. 1 u 11 256 377 123.504 -22.762
19.197
gps-2.mit.edu .GPS. 1 u 34 256 377 246.793 -49.433
3.131
oPPS(1) .PPS. 0 l 4 16 377 0.000 0.000
0.004
ptbtime2.ptb.de .PTB. 1 u 38 256 377 157.004 -47.865
2.205
gps-1.mit.edu .GPS. 1 u 24 256 377 239.559 -38.903
31.765
The question is: is it the time received from the GPS receiver bad ? I
suppose a network problem (upstream delay different from downstream
delay) but how may I bypass this problem - for the moment I have the
noselect for all external servers (without the noselect option the
server will reject the time from the GPS receiver).
Thanks !
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