[ntp:questions] SNTP with 1ms of precision?

Marcelo Pimenta marcelopimentacs at gmail.com
Thu Jun 17 14:05:13 UTC 2010


2010/6/17 unruh <unruh at wormhole.physics.ubc.ca>

>  On 2010-06-16, Marcelo Pimenta <marcelopimentacs at gmail.com> wrote:
> > 2010/6/16 Rob <nomail at example.com>
> >
> (...)
>

> > In my case, I have* only one* network. My Time Server is not a machine,
> is a
> > meinberg GPS. In my point of view, if my source time were machines, maybe
> A Meingerg GPS IS a machine.
>

I agree, I said machines equipment like PC computers with Windows or Linux
SO. Meinberg GPS is a machine, but a machine with specific hardware and SO
to receive and give time.



> > NTP could be better to find a middle line between all these machines used
> as
> > time servers. But if I am using a very good and reliable GPS(Meinberg)
> with
> > a lot of satellites giving it the correct time, and it's pluged directly
> in
> > my switch, I think that in this case, NTP will not make any difference.
>
> Sure it will. ntp is designed to deliver as accurate a time as poosible
> It does not care if the soruce is anohter computer, a GPS a radion
> transmitter, a CDMS clock broadcast, or someone's wristwatch.
>
> One of its key purposes is to make sure that it gets rid of time
> transmission delays as much as possible, and to make sure that the
> clocks it uses are sensible.
> Note that your Mienberg gps could also give bad time. Someone could
> decided that they should enclose it in a coper wire mesh, making the gps
> signal inaccessible. Or the computer could fail. or....
>
> Meinberg could give me bad time but I have feedbacks about it and a contact
that can close when an antenna fail or other part of GPS fail and cannot
garantee the time.

>
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