Hi! On 16 November 2011 16:11, A C <agcarver+...@acarver.net> wrote:
> On 11/16/2011 00:15, Harlan Stenn wrote: > >> What sort of offset/jitter are you seeing on the NMEA signal? By >> default we expect it to be correct to about 2ms. >> > > I posted more data in another reply but the NMEA tends to have offsets of > +/- 50 ms and jitters of +/- 10 ms while the PPS and Internet servers are > all much more stable. PPS has a jitter of only 0.061 ms reported by ntpd > (but probably better than that, the jitter value never drops below 0.061 > for any server, in fact it's present in the entire billboard jitter column > when ntpd first starts up so it must be a floating point > calculation/rounding issue). A couple of the Internet servers can wander > off if the network is bad but most of them stay within +/- 5 ms of offset > and +/- 1 ms of jitter. > In one of my servers I have tos mindist 0.250 This enables PPS and NMEA to differ 250 ms. I hope I am not saying anything wrong but you can check the NTP documentation regarding this keyword. Cheers, Miguel _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
