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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