[ntp:questions] Re: isolated network + accuracy

Alaios alaios at yahoo.com
Mon Dec 13 16:32:25 UTC 2004

Thx really for the answer... If i have understand
correctly the problem of not having good accuracy is a
problem of my server because it always loses

If i connect the server to the internet under a
stratum 2 server, do u think that the server can
achieve accuracy below 1 ms? Do u think i must
configure the server in a specific way for my

After finishing with the server then the clients can
achieve synchronization with accuracy of 1 ms or this
is still impossible? The major problem is that i want
all the clients to be synchronized and each of them
has an accuracy of 1 ms or less.
Really thank u!
Have a nice day 

--- "Richard B. Gilbert" <rgilbert88 at comcast.net>

> Alaios wrote:
> >Goof morning. I have an isolated network and i want
> to
> >achieve accuracy smaller than 1ms. Do u know if
> that
> >is possible? How i must configure the clients for
> >that?
> >Any suggestion?
> >
> >
> >		
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> Without a stable source of time, I'd say that
> synchronization within 1ms 
> is not possible.  The typical, unsynchronized,
> computer clock is neither 
> stable nor accurate.
> You will need a hardware reference clock of some
> sort.   A cesium 
> frequency standard (with clock option) is the best
> there is.  It's also 
> extremely expensive.  A rubidium standard is second
> best and 
> considerably cheaper but still expensive to buy and
> maintain.  A GPS 
> timing receiver can be obtained for less than $500
> US and is a very good 
> choice if you can place an antenna where it has an
> unobstructed view of 
> the entire sky.  An oven controlled quartz crystal
> oscillator can 
> provide a stable source.
> Configure one computer with attached hardware
> reference clock as the 
> server.   Configure the clients to get their time
> from the server.
> Don't expect much from Microsoft Windows in the way
> of accuracy; the 
> clock resolution is too low and the operating system
> tends to lose 
> interrupts (clock ticks) when it is busy doing
> something else.  Linux 
> also has been known to have problems with losing
> interrupts.
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