[ntp:questions] Re: Is the time from the GPS receiver bad ?
Eugen COCA
ecoca at eed.usv.ro
Tue Sep 12 03:19:52 UTC 2006
This is a normal situation:
ntpq> pe
remote refid st t when poll reach delay offset
jitter
==============================================================================
+GPS_NMEA(1) .GPS. 0 l 49 64 377 0.000 0.000
0.004
ptbtime1.ptb.de .PTB. 1 u 222 256 377 59.668 -0.685
0.256
ntps1-1.cs.tu-b .PPS. 1 u 8 256 377 54.452 0.015
17.763
ntp-p1.obspm.fr .1PPS. 1 u 135 256 377 55.599 -0.639
6.994
gps-2.mit.edu .GPS. 1 u 199 256 357 145.327 -0.031
20.853
oPPS(1) .PPS. 0 l 1 16 377 0.000 0.000
0.004
ntp2.usv.ro .PPS. 1 u 63 64 377 0.267 -0.008
0.005
ntp3.usv.ro .PPS. 1 u 20 64 377 0.320 -0.002
0.041
ptbtime2.ptb.de .PTB. 1 u 223 256 377 59.589 -0.175
0.342
gps-1.mit.edu .GPS. 1 u 212 256 377 146.007 0.049
0.230
As I said before, when that situation happen the ntpq algorithm exclude
the GPS+PPS source from the trusted sources list and syncronize - in
error - with one of the "bad" timetikers.
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