http://www.satsignal.eu/mrtg/daily_ntp.html
Alta's graph on that page is scaled inappropriately for its current
performance level. Follow the link at the top of the page to the
Alternative Presentation and you'll find a graph of alta with a more
useful scale (albeit also a different style with the absolute value of
the offset as the Y scale and a different color to indicate
negatives).
Cheers,
Dave Hart
Correct. Like most of my PCs, PC Alta was never designed as a stratum-1
server, but as I happened to have a second Sure Electronics GPS board
which needed testing, and as using an unsigned driver on 64-bit Windows
was one of those "You can't do that" challenges, it just happened! I have
now added an additional graph scaled +/- 500 microseconds to compare with
the other starum-1 Windows servers. (The FreeBSD graph is scaled +/- 20
microseconds, by the way). It will take the data some time to populate
the new graphs, of course. PC Alta also functions as a virtual radar
using the Plane Plotter software and ADS-B receiver, receives about 40 GB
of data per day over a digital satellite feed, and process that data into
weather images, so I am not expecting it to be the most stable of Windows
stratum-1 servers.
I have also added more appropriate graphs for the Windows 2000 server, PC
Bacchus, which is also an accidental stratum-1 server, working from a
paralleled serial feed from a GPS 18 LVC. It also receives weather
satellite data, but this time from a 137 MHz audio feed (APT) which it
demodulates into image data, and serves over the network. It's quite
old - a 550 MHz Pentium III (if anyone remembers those!). When the disk
drefrag runs on Wednesday it hammers the timekeeping, even on the old
graph scale.
I have some loopstats files if anyone is /that/ interested.
Thanks for the prompt to enhance this.
Cheers,
David
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