Some GPSDO have both a 1PPS and a PP2S (pulse per 2 second) output. I have two 
questions for one of you telecom experts: 1) What is the history, and the 
purpose of that PP2S signal? 2) What is the official spec for which second the 
PP2S lands on? Is it odd seconds or even seconds? Is it GPS time (easy) or UTC 
(problematic)? If UTC, what happens after a leap second?

Thanks,
/tvb
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