[Pool] High Offset / Jitter
david at lordynet.org
Tue Mar 1 16:19:59 UTC 2011
On 1 Mar 2011 at 7:46, Alby wrote:
> I think I found my PPS issue. I'm using Debian and I found a blurb on
> worldtimesolutions.com website with a step by step run through on
> configuring the kernel. At the top of their post, they say you need
> PPS on a different com port. Ack!!!
> upport_for_ntpd.html Enabling ntpd PPS support for Debian Lenny Linux
> The following procedure takes the standard pre-built Debian kernel and
> rebuilds it with PPS (pulse per second) support for ntpd. This allows
> you to utilise a low cost gps serial time antenna to turn your
> existing Debian Linux server into an economical stratum 1 ntp network
> time source.
> (Please note that in this configuration, the pps data and serial time
> and date data should be supplied to the Linux server on different com
> ports. Alternate linuxpps patch / kernel versions may fix this issue).
I tried my 18x-lvc on Ubuntu and there was no need to
use a different com port. Also ppskit wasn't needed either
(although it was required on an earlier kernel version).
I've not used it with gpsd other than as a check that gps
was working ok.
The reason I was using parallel port PPS on NetBSD is that
serial DCD was also being used for monitoring a different
PPS from a xtal source.
> >> You could be doing much better if you got the PPS working as well.
> >> Note that the reach is zero. The PPS line should have a "o" as the
> >> first character if it's working properly (like the NMEA has a "*").
> >> Perhaps you need to rebuild the kernel with PPS support - but I'm
> >> not familiar enough with Linux to know whether that's required.
> >> Perhaps someone can help with your Debian OS (Version
> >> 2.6.26.pps001).
> >> Cheers,
> >> David
> >> --
> >> SatSignal software - quality software written to your requirements
> >> Web: http://www.satsignal.eu Email: david-taylor at blueyonder.co.uk
> >> _______________________________________________
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David Lord <david at lordynet.org>
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