[ntp:questions] refclock on Windows graphs

Danny Mayer mayer at ntp.org
Sat Mar 21 21:31:23 UTC 2009

David J Taylor wrote:
> Dave Hart wrote:
> []
>> The 150us offsets are while slewing to try to catch up with the 3ppm
>> frequency shift as the heat comes on.  I have to imagine a Windows PC
>> with a more stable oscillator (lower temperature coefficient to
>> frequency) would do better, though I'm not deluding myself that it
>> would match the performance of FreeBSD, with its advantage of knowing
>> the precise relationship between the counter and the system clock.
> Yes, it would be nice to have a more stable crystal in that system. 
> Agreed on the comparison with FreeBSD.  Isn't there an NTP simulator where 
> someone could model jitter and offset against a 2.5ppm sinusoidal or 
> triangular frequency swing?

Just build the NTP simulator that comes with the NTP sources. There are
config options you need to build this.


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