[ntp:questions] Solving the right problem
unruh at wormhole.physics.ubc.ca
Thu Mar 25 20:54:15 UTC 2010
On 2010-03-25, E-Mail Sent to this address will be added to the BlackLists <Null at BlackList.Anitech-Systems.invalid> wrote:
> unruh wrote:
>>> You said: "In most cases, it is easier to solve the
>>> problem of sync'ing all computers to a correct timesource
>>> (and thus all be mutually in sync)...".
>>> I think I agree with that principal, though I don't yet
>>> feel I know enough to 'do it'. Would like to have your
>>> (and others') help in learning the nuts-and-bolts of
>>> understanding that, and how to accomplish it.
>> It means that you have one ( or two ) computers sync to
>> an external source and then use that machine as the
>> source for the others.
> It doesn't have to be an "external source", if cheap is
> not a goal, and isolation from the rest of the world is.
> They can get their own in-house frequency standard(s),
> to PPS discipline their NTP server(s).
> I'm certain the sales people at Symmetricom could provide
> them with NTP servers that don't make use of any outside
> world references.
Sure, for a few tens or hundreds of thousands of dollars. When a gps
puck is $100, plus some wire. I would suspect that they would be more
willing to spend $200 for a p\gps puck and some wire, than $100000 for a
H Maser clock, but who knows, maybe not. On the other hand all he wanted
was to sync the computers to each other, and learning about orphan mode
should only cost a few $100 in his time and salary as well.
> symmetricom.com sells Cesium, Rubidium and Hydrogen Maser Standards
> quartzlock.com sells Rubidium Standards
> (and used to sell Hydrogen Maser Standards?)
> novatech-instr.com sells Rubidium Standards
> Selecting a Primary Frequency Standard for a Calibration Laboratory
> (Cal Lab Int. Jour. of Metrology, April 2008, pp. 33-39)
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