[ntp:questions] proprietary hardware clock as NTP reference source

Rob Neal hundoj at comcast.net
Sun Jun 13 18:35:37 UTC 2010


On Sun, Jun 13, 2010 at 04:21:58AM +0000, Rob Neal wrote:
> On Fri, Jun 11, 2010 at 02:26:13PM -0700, apobrien wrote:
> > Hello list,
> > 
> > I have a set of proprietary hardware timing cards (Symmetricom
> > bc635PCIe) which synchronize their clocks using a dedicated
> > interconnect.  As you might imagine the timing card conditioned time
> > drifts from that of the hosts they're installed in.
> > 
> > What I'd like to do is make the "master" timing card's time into a NTP
> > reference clock then use NTP to distribute that time to the other
> > hosts in the (private) network.
> > 
> > I've looked at Orphan mode and undisciplined local clocks but they
> > only refer to the host's software clock if I'm not mistaken.  I've
> > also searched through the archive but I'm afraid I lack the
> > appropriate terminology to get meaningful results.
> > 
> > Can someone point me toward (some google words maybe) creating an
> > arbitrary NTP reference source (under Linux)?  I think I'm just
> > missing something very basic.
> > 
> > I've been looking at the LinuxPPS project as these cards output a PPS
> > that I might use to condition the host clock using Linux PPS but I
> > don't have a 8250 serial port on these new fangled PCs.
> > 
> > TIA!
> > Andy
> > 
> > _______________________________________________
> > questions mailing list
> > questions at lists.ntp.org
> > http://lists.ntp.org/listinfo/questions
> Symmetricomm has a kernel mode driver for the bc635/7 cards, for Linux. 
> If you have a copy you can use ntp reference clock 22 (bancomm) to 
> feed the time to NTP
> 
> refclock 127.127.16.u mode 2 
> 	in the config file, where u is whatever unit your card presents as. 
> 
> The Symmetricom driver is proprietary, they charge for it, btw. 
> 
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> questions at lists.ntp.org
> http://lists.ntp.org/listinfo/questions

ur, refclock 16 is bancomm, not 22, sorry. 22 is the ATOM driver. Sorry
for the confusion. 




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