[ntp:hackers] Solaris serial port jitter

David L. Mills mills at udel.edu
Thu Oct 21 20:36:55 PDT 2004


Apparently, the serial port driver on both Ultra 1 and Blade 1500 are 
jiggered so that, if you enable the PPSAPI, the jitter goes away, even 
if the PPS is not actually connected. Away means a couple of hundred 
microseconds, but that is expected. It was several tens of milliseconds 
to over a second. With PPS the Ultra 1 (pogo) is nominally 20 
microseconds jitter.

That's a relief.

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