Thanks Chris. Those are more considerations that I hadn't thought of. I begin
to see why there's no "standard".
Bob
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From: Chris Albertson <[email protected]>
To: Bob Stewart <[email protected]>; Discussion of precise time and frequency
measurement <[email protected]>
Sent: Tuesday, August 16, 2016 7:59 PM
Subject: Re: [time-nuts] Holdover
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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