[ntp:questions] Re: Improving ACTS performance
jcoombs at gwi.net
Thu Apr 6 19:40:42 UTC 2006
> I've seen ACTS referred to as "Automated Containerized Trash
> What you see may be the best that ACTS can do.
> Have you considered using another technology? A GPS receiver is not
> terribly expensive (as low as $85 US) and such a receiver designed
> for timing applications can deliver accuracy in the neighborhood of
> 1 microsecond. The PPS signal is accurate to better than 100
> nanoseconds but few computers are capable of that degree of
> accuracy. 1 microsecond is easily obtainable. I use a Sun Ultra 10
> (440MHz processor), Solaris 8 and ntpd 4.0 and get that accuracy.
> That's eight year old technology; more modern hardware and software
> might do better.
Just getting permission to use a phoneline for ACTS required small
sacrifices I may never recover from...
I'd love to setup GPS or Cellular driven time clocks, but my two data
sites are setup such that I can't get a viable signal inside, and have
no access to setup an antenna outside.
I 'think' I may have spotted part of the trouble. My init/dial string
wasn't disabling error correction or compression. I'd imagine one or
both could really wreck havoc with the latency estimation. Now I get
to wait a week to see if I'm right... : )
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