[ntp:questions] Using Trimble TSIP under Linux

David Woolley david at ex.djwhome.demon.invalid
Mon Nov 26 23:59:32 UTC 2012


David Taylor wrote:

> server reached over the LAN to have an offset of -0.028 milliseconds, 
> whereas its own PPS source is reported to have an offset of -0.001 
> milliseconds.  Is that the right sign and amount for the offsets you 
> might expect comparing the LAN input and the GPIO pin interrupt for the 
> PPS source?

Offsets should be randomly distributed between + and - signs.  If they 
are all of one sign, you are not locked up or there is a bug.  They 
should be of s similar magnitude to the jitter.

They may not be evenly distributed, because of limitations of the 
network, but they must be spread across zero.



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