[time-nuts] gpsd 1pps pulse?

Mon May 6 13:38:54 UTC 2013

I would like to set up a NTP server on a machine running Linux
(currently Korora 18).

What are the requirements for the 1 PPS signal fed to the carrier detect 
pin?
I presume the 10 us 1pps from the Thunderbolt is too narrow.
I assume the rising edge of CD is the one gpsd triggers on.

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