[ntp:questions] Using PPS
JSmall at daraco.com.au
Thu Dec 27 10:55:16 UTC 2012
I built an NTP server with a GPS and PPS as per this guide (exact hardware):
I got things up and running with the same result as per said guide, before determining that my PPS wasn't wired up correctly.
I fixed that, and now I'm sure it's wired up - it's now detected in dmesg, and ppstest indicates it's running.
As far as any NTP diagnostic I can find goes however, nothing is any different (it feels like I have less drift, but I didn't keep graphs before), which leads me to the question of "how do I know it's working?".
As per the guide, I run this in ntp.conf:
server 127.127.20.0 mode 17 minpoll 3 iburst true prefer
fudge 127.127.20.0 flag1 1 time2 0.496
I can definitely see, in ntpq -p, the GPS_NMEA driver being used.
I can see a related thread here:
Specifically, my googling generally pointed me at looking for PPSSIGNAL in the status, however, it seems that a lack of it (as is my case) is "normal" in many circumstances.
Any advice appreciated.
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