[LEAPSECS] Future Leap Seconds

[Peter Vince]

On 27 January 2015 at 23:03, Warner Losh <imp at bsdimp.com> wrote:
...
> A "cold spare" that's sitting on the shelf powered off for more than 6
months. When
> the original fails, the hot spare is returned to service and must wait an
additional ~30
> minutes to get the latest almanac before it can recover UTC time from GPS
time.
> This 30 minutes of down time puts the system at < 4 9's of reliability,
and is an
> unacceptable delay. ...

That assumes you can instantly get the cold unit off the shelf and plugged
in.  I suspect that actually doing that will, in most cases, take well over
half an hour, and hence there goes your 4 9's, regardless of how quickly
the unit can give an accurate output.
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