[ntp:questions] How to determin hardware latency for PPS offset given simple tools.

Paul G bodosom at gmail.com
Mon May 27 03:52:44 UTC 2013


On Saturday, May 25, 2013 3:05:13 AM UTC-4, David Taylor wrote:
> What happens with the fudge set to zero?
> Please show the table for each machine.

Showing 192.168.0.2 and .244 with time1 = 0 as compared to the first post where
time1 was ~100 microsec.

These two have gigabit interfaces. 0.2 is driven by a Garmin 18x and 0.244 is
driven by a Firefly (I).

0.2
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
o127.127.22.0    .PPS.            0 l    1    8  377    0.000   -0.001   0.002
+192.168.0.244   .PPS.            1 u    -    8  377    0.075   -0.128   0.001
*192.168.0.210   .GPS.            1 u    7    8  377    0.519    0.117   0.098

0.244
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
o127.127.22.0    .PPS.            0 l    5    8  377    0.000    0.000   0.002
+192.168.0.2     .PPS.            1 u    4    8  377    0.079    0.132   0.003
+192.168.0.210   .GPS.            1 u    4    8  377    0.547    0.253   0.135
*192.168.0.192   .PPS.            1 u    3    8  377    0.475    0.262   0.036




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