[ntp:questions] Multiple PPS Lines

Matt Corallo ntp-lists at mattcorallo.com
Tue Sep 15 16:26:09 UTC 2020

Is there any interest in a patch to select across multiple PPS lines (maybe median of the available lines, or maybe 
using clock_combine) instead of just blindly taking the first one? This would also allow us to take the second available 
PPS line if the first one fails the "within 400ms" requirement.

Also, would it make sense to add a flag for "PPS, but with known time" which could be used in eg GPSD_JSON(N+128) 
refclocks, indicating that while this is a PPS input, it is *also* a clock that knows what time it is.

Finally, how maintained is GPSD_JSON? There's some pretty big show-stoppers I filed at 
https://bugs.ntp.org/buglist.cgi?product=ntp&component=refclock%20-%20gpsdjson&resolution=---&list_id=15257 (that now 
have patches attached).


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