[LinuxPPS] Offset and jitter of GPS/DCF PPS signals

[Heiko Gerstung]

Thorsten,

which OS?

Regards,
  Heiko


Thorsten Mühlfelder schrieb:
> Hi everyone
>
> I just wanted to ask what you guys think about my graphs. I'm using 2 servers with Soekris AMD Elan (133MHz) boards: Number one has a Meinberg PCI DCF77 card, number two has a Meinberg PCI GPS card. Both Meinberg cards have a PPS output, too. The servers get their timecode by DCF/GPS and are synchronized by the PPS signal of their own cards.
>
> Here you can see how the ntpd on the DCF server sees the PPS signal of the DCF card:
> http://img-up.net/img/dcf-ppsURM2775K.png
>
> Here you can see how the ntpd on the GPS server sees the PPS signal of the GPS card:
> http://img-up.net/img/gps-ppsoNL9T8F4.png
>
> Do you think these values are OK?
> I think the DCF PPS can't get any better because of the technical specification of DCF77.
> But I don't know about the GPS server? Is it OK or should it be better? Also I wonder about the constant 15 us jitter value.
>
> Greetings
> Thorsten Mühlfelder 
>