[ntp:questions] Constant jitter value

Andrew Luebke andrew.luebke at gmail.com
Fri Sep 26 03:09:07 UTC 2014


I've setup a NTP server with an OXCO and GPS PPS and it works great,
however, after it's had time to stabilize the jitter for the PPS (and the
system clock) is constant at 1.907us.  I'm at a loss as to why it would have
a constant jitter.  Seems like jitter should move around.  Here is a sample
of the peerstats which show the constant jitter:

 

56925 85226.572 -0.000000827 -0.012 0.000001907 0.000012 3
56925 85234.567 0.000000173 -0.012 0.000001907 0.000011 3
56925 85242.601 -0.000000097 -0.012 0.000001907 0.000010 3
56925 85250.601 -0.000000546 -0.012 0.000001907 0.000011 3
56925 85258.589 -0.000000214 -0.012 0.000001907 0.000012 3
56925 85266.606 0.000000145 -0.012 0.000001907 0.000011 3
56925 85274.588 -0.000000249 -0.012 0.000001907 0.000010 3
56925 85282.572 -0.000000688 -0.012 0.000001907 0.000011 3
56925 85290.578 -0.000000571 -0.012 0.000001907 0.000015 3
56925 85298.579 -0.000000238 -0.012 0.000001907 0.000014 3

 

Any ideas?

 

Thanks,

Andrew.



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