[time-nuts] new member with questions NTP, PRS, GPS, ocxo

ken johnson bats059 at gmail.com
Sat Aug 18 16:54:53 EDT 2012


Again on power consumption, I used to run my web server (ubuntu
10.04lts) on a fanless mini-itx board, about 30 or so watts- now it's
on a BeagleBone arm board about the size of a credit card, still
running ubuntu , consumption is down to a whole 2 watts. I have it
running ntp and serving time to the rest of my home network. Even 'er
indoors thinks that sort of power consumption is acceptable!



On Sun, Aug 19, 2012 at 2:20 AM, David J Taylor
<david-taylor at blueyonder.co.uk> wrote:
> From: Chris Albertson
> Sent: Saturday, August 18, 2012 4:55 PM
> []
> Power is a bigger issue.  It really does cost a bit to keep some
> machines owered up 24x7 and NTP needs to run all the time.  It takes
> NTP hours to stabilize and you want to wait 24 hours after to measure
> performance.
> []
> Chris Albertson
> Redondo Beach, California
> ================================================
>
>
> I see this "hours" or "many hours" figure quoted, and yet here NTP is
> sufficiently accurate within a few minutes.  I'm thinking within 200
> microseconds, on a Windows system fed with a PPS signal on the serial port,
> which is good enough for me, but not perhaps for others.  To get within,
> say, ~10 microseconds on a FreeBSD system, then within an hour or so seems
> to be enough.  Agreed that running 24 x 7 is the ideal state for a server,
> and that a fanless Intel Atom system is an excellent way to reduce cost.
>
> Cheers,
> David
> --
> SatSignal Software - Quality software written to your requirements
> Web: http://www.satsignal.eu
> Email: david-taylor at blueyonder.co.uk
>
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-- 
Cheers, Ken
bats059 at gmail.com
www.vk7krj.com

'It seems hard to sneak a look at God's cards. But that He plays dice and uses
"telepathic" methods .... is something that I cannot believe for a single
moment.'     (Einstein's famous quote on Quantum theory)




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