Hi,
Sorry I missed the OP, but have you checked out this list:?
http://psp2.ntp.org/bin/view/Servers/StratumOneTimeServers
Regards,
Chris
Randolph Bentson wrote:
I've seen three replys, all asking why I need a stratum one source.
Here's the background:
I'm at the University of Puget Sound where the Technology Services group
runs some stratum two servers relying on a well-known stratum one server
in Seattle (I'll call BB). Just for the fun of it, last summer I plugged
a Garmin GPS17HSV into one of my systems to provide pulse-per-second
discipline to the system's clock. When I did, I added that BB to my list
of time sources. The kernel tracked the GPS fairly well, staying under
+- 200 us difference; the difference from BB stayed in the same range,
but showed lots more moment-to-moment changes. When I booted to the
latest kernel and restarted ntpd on February 4th, the system followed
the GPS clock much more closely, generally +- 10 us; BB still had a +-
200 us range of time difference.
Then the probem arose:
On Febrary 27 the difference between the system's clock and BB started
to diverge. This caught my attention and after a few days confusion I
added some more stratum one servers to my list in an attempt to determine
where the problem was. I found that another GPS based server matched
BB fairly closely; three other ACTS based servers hovered near the GPS
based servers, but had much more variation. There was one ACTS server
which was very stable, but was offset from the others by 8 ms in the
other direction, i.e., my system fell between the cluster and the
outlier..
This discrepancy reached a peak of nearly 9ms on March 5th and is on
its way back to agreement with my GPS clock. I'd like to connect to some
nearby stratum one servers where the round trip delay and jitter is less
than the offset. That'll limit the possiblity that the divergence is due
to asynchronous delay. In addition, I'd like to talk to the administrator
of those sites to see if they connect to other stratum one servers,
and if they've seen any divergence.
I hope that I can resolve this before this summer so I can enter one of
our CS dept servers into the NTP pool.
