[ntp:questions] question regarding NTP configuration for clusters, and "cluster time" stability

Nero Imhard nim at pipe.nl
Mon Nov 23 08:29:25 UTC 2009

Steve Kostecke schreef:

> What you really want is a decent quality PPS generator (e.g. Rubidium)
> which feeds an internal time server.

Beware that ntp treats a PPS signal as a time source. A Rubidium 
oscillator is a frequency source, so it will slowly but inevitably "run 
away", unless locked to a proper time source.

Without such locking, the Rb should not be used as a PPS source (but 
could very well be a replacement for the clock's crystal).


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