On 17 October 2011 17:37, unruh <[email protected]> wrote:
> On 2011-10-17, Miguel Gon?alves <[email protected]> wrote:
>> Excluding the Garmins and Sure Evaluation Boards which both have PPS
>> outputs what are the best (meaning well supported) refclocks today to
>> set up a new server?
>
> Perhaps you should tell us what your requirements are? You dismiss two
> very valid possibilities for no stated reason. Tell us what you need and
> you might bet helpful comments.
1 us accuracy like the Garmin or Sure is good enough. It's to be used
in local clock synchronization with NTP. I am achieving < 10 us with
NTP in our LAN on certain machines.
The reason is that I already have one of each and want a different
third clock. Nothing against Garmin or Sure. In fact, I highly
recommend both. Our Garmin based NTP server is in our DMZ serving the
NTP Pool Project:
$ ntpq -p 1.pt.pool.ntp.org
remote refid st t when poll reach delay offset jitter
==============================================================================
*GPS_NMEA(0) .GPSg. 0 l 7 16 377 0.000 6.132 6.592
oPPS(0) .PPSg. 0 l 6 16 377 0.000 0.004 0.004
+ntp-p1.obspm.fr .TS-3. 1 u 61 64 377 45.184 1.124 1.177
+ptbtime1.ptb.de .DCFa. 1 u 9 64 377 67.106 1.281 1.668
+ntp1.oma.be .PPS. 1 u 6 64 377 56.116 5.272 0.684
+canon.inria.fr .GPSi. 1 u 31 64 377 44.312 1.096 1.016
+ntp1.nl.uu.net .PPS. 1 u 5 64 377 58.679 3.958 0.624
+ntp1.as34288.ne .PPS. 1 u 34 64 377 65.763 2.384 1.939
-smtp.certum.pl .GPS. 1 u 19 64 377 85.549 -1.574 1.733
It's the only stratum 1 in this country. :-)
Cheers,
Miguel
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