On Tue, 14 Jun 2011 18:12:52 +0200 Per Molund <pmol...@gmail.com> wrote:
> The reason for this is mostly based on the installation environment. I am > 'piggy-backing' on an commerical site (ie. for free) and rack-space and > electricity are premium. I have also a need to have the installation look > professional in order to avoid to much 'bad' attention. The installation > already occupies a 3U receiver, 1U server plus a 1U GPRS modem, so using > an old PC for NTP server is out of the question. Also the additional > 2600 kWh per year electricity (150W x2 for PC plus cooling) would strain > my goodwill at the site. > > As for Internet, yes we do have an connection, but via GPRS so it is not > any good for ntp use. As for performance I am seeing 200-400 ms today with > GPRS which is not good enough for my application, I hope to get down into > low or sub ms range. Have you had a look at GPS PCI/PCI-e cards? Like those Meinberg sells. They are not exactly cheap, but considering your constraints, it might be a good solution. It will just go into one of the to servers you already have, consume very little power (only as much as the gps system would need anyways), and it has a "professional" look. If those are too expensive, you can try to get one of the many Mini PCI-e GPS cards available on ebay (go as cheap as 10USD) and a adaptor card (approx 20-30 USD). I don't know whether those are time-nuts grade, but i'm quite sure you should get into the sub-ms range with those. Attila Kinali -- Why does it take years to find the answers to the questions one should have asked long ago? _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.