On Tue, Oct 4, 2016 at 9:05 PM, Chris Albertson <albertson.ch...@gmail.com> wrote:
> The problem, I think with your Internet sync's NTP servers is you are only > using one server S. The most common practice is to use 3 to 5 with 5 being > about the right number. If you get Ntp enough Internet servers to work > with it can detect problem like asymmetric path lengths which I'm sure is > you problem. > NTPD cannot find asymmetric delays. The NTP protocol assumption continues to be symmetric delays with random delay spikes that can discarded. However despite that the resultant jitter and offset from asymmetry should be on the order of milliseconds (O(1ms)). As the OP has seen not using PPS swamps all other errors -- NMEA (et.al.) errors are O(100ms) unless you have a well designed unit e.g. a JL Fury. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.