[ntp:questions] Re: PCI add on oscillator

Bjorn Gabrielsson bg at lysator.liu.se
Thu Apr 28 19:11:21 UTC 2005


"Richard B. Gilbert" <rgilbert88 at comcast.net> writes:

> Joshua Coombs wrote:
> 
> > Given standard pc clocks are less than ideal, with wide drift, etc,
> > does anyone make a good quality oscillator as an add in, say via
> > PCI? Ideally something NTP could discipline, so one could build a PC
> > that could serve reliable time for more than 5 mins if external time
> > sources became unavailable.  I believe I read an article by PHK
> > where he built one for test purposes, the discussion of 500ns
> > accuracy got me thinking about it again.
> >
> > Joshua Coombs
> 
> Symmetricom may still make such a thing.   The BC637PCI that has been
> mentioned recently here was such a device.  ISTR that Symmetricom's
> web site said something about the card being "End of Life" but others
> here believe that there is a replacement.
> 
> I believe that Meinberg also makes PCI based clock cards.
> 
> You will need to contact Symmetricom and Meinberg and ask for the
> details.  Don't be surprised if they are expensive.  The better the
> specs, the more expensive they will be!!!  The BC637PCI originally
> sold for more than $3000 US!

A dream might be a soekris card with a external clock input. A rf
connector where the user would plugin whatever 10MHz freq (standard)
he wanted to use.

--

        Björn



More information about the questions mailing list