[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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