On 11/15/2011 23:28, Harlan Stenn wrote:
OK, and you understand that the NMEA sentence is expected to be correct to only +/- 0.5sec, as the PPS signal is un-numbered and the purpose of the NMEA data is to identify the time at the pulse of the PPS signal.
Yes, the PPS is unnumbered however if I have valid and reachable Internet server then I have numbers from them, too. PPS is only serving as the clock tick, I understand that fully. But you're missing the point of my question:
I don't care about the exact accuracy of the NMEA. I mention the NMEA to point out that it is unstable and I would like it to not be part of the timing computations unless no other server is available. That's what I'm asking. If I use the "noselect" option, it is never a valid time server no matter what. If I use "prefer", it's always a valid time server. I'm asking if there's a way to configure ntpd such that everything EXCEPT NMEA is a preferred peer unless all the other peers are dead in which case fall back to NMEA (all predicated on the GPS being functional, if not that's a completely different issue).
Right now, it is almost always part of the valid group of servers. It is never marked as a false ticker or an outlier even if its data is terrible compared to any of the other five configured Internet servers.
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