[time-nuts] Holdover

Chris Albertson albertson.chris at gmail.com
Tue Aug 16 20:59:33 EDT 2016

What to do during and right after holdover depends on the reason you have a
time standard.  If it is for maintaining a lab standard, then just shut
down as you can't perform your primary function.  It you have this standard
because you are required to time stamp financial transactions then you have
to keep going until you estimate some error threshold then stop.  If you
are using it to aim a telescope then again, stop using it the estimated
error is enough that you'd miss your targets.    It depends on the use case.

I remember aiming a telescope when our best source of time was NTP over a
dial-up phone modem in the days before always-on Internet  This was in the
1980's and it worked well enough.  The normal case was "outage" as the
modem connection was short and only a few times per day.  But was good
enough to re-calibrate a local  clock

Chris Albertson
Redondo Beach, California

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