[time-nuts] Thunderbolt rollover glitch

[Mark Sims]

Attached is a plot of  Thunderbolt data before and after the event.  2 seconds after rollover the Thunderbolt reported it was re-initializing the loop filter and 4 seconds after the event it reported is was starting to phase lock the 1PPS.   The DAC jumped 0.023V V which is around 75 mHz of frequency change.  The 1PPS jumped around 2936 ns.  

It looks like it is going to take a few fours to recover to its pre-rollover state.
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