No subject


Sun Sep 12 16:34:46 UTC 2010


shock and vib that could, and probably does, sometimes exceed the spec
on these boxes.  For a box that has to survive repeated power cycles,
dusty conditions with limited airflow and unmanned operation, the
commercial boxes are optimal but can still have issues.  For OP, Rb in
these devices is primarily targeted at holdover, providing extended
periods of NTP service when the input time source (e.g. GPS) is lost.
It doesn't sound like this is a requirement for your application.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Rob Kimberley
Sent: Tuesday, November 30, 2010 7:55 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] OT: NTP server questions

FWIW, you can't go wrong with Meinberg.=20

Several  versions to choose from, reliable, and priced well.

Rob Kimberley

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Robert Darlington
Sent: 30 November 2010 2:47 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: NTP server questions

Basically I need something to provide time within one second.  I can't
roll
my own in this case.  At home I have a Soekris box with a custom built
gps
board for my normal level of time-nuttery but this is not for home.  I'm
looking for commercially made rack mount servers that will not have
Internet
access for reference and will need to rely on gps.   The system will
need to
serve time to less than 100 systems but it will live in a nasty
environment
in the back of a humvee (or something like an S-250 electronics
enclosure)
with no air conditioning of any sort.  I'm currently looking at
Symmetricom,
Trimble NetRS, EndRun, and Meinberg.

Also, I apologize if I'm breaching protocol with this thread.  This is
just
about the first post I ever saw on this list that didn't get a steady
stream
of replies.  I was actually questioning if this even made it into the
list
till I saw this reply.  Yes this is for work and I could really use some
opinions on this stuff since dropping $4-6k isn't in my nature to do at
home
for a network clock so I never gave this thought before.

Thanks again,
Bob


On Mon, Nov 29, 2010 at 11:39 PM, Chris Albertson
<albertson.chris at gmail.com
> wrote:

> What do you need to do?  What precision is required and how many=20
> clients will
> you be serving.   For most "normal" uses you don't need a special
purpose
> server system.  A $600 notebook PC and any GPS unit with a serial=20
> connection and a copy of Linux or BSD.
>
> On Mon, Nov 29, 2010 at 11:36 AM, Robert Darlington=20
> <rdarlington at gmail.com> wrote:
> > Hi guys,
> >
> > I'm looking to buy an NTP server for a field deployable server=20
> > system.  I currently have a Symmetricom SyncServer S250 which does
more
than I need.
>  I
> > am considering buying an S200 (same as the S250 but without the=20
> > ability
> to
> > connect to an external frequency standard).  My gut feeling is I=20
> > don't
> need
> > a rubidium oscillator or even an OCXO internally since we'd be going

> > from
> a
> > power on to being used state in under an hour, outside of any kind=20
> > of temperature controlled environment.  Are there any manufacturers=20
> > out
> there
> > besides Symmetricom that I should be looking at for something like
this?
> > The unit we're considering buying is about $4k new and is inside of=20
> > our budget.
> >
> > Thanks,
> > Bob
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
>
>
>
> --
> =3D=3D=3D=3D=3D
> Chris Albertson
> Redondo Beach, California
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com To unsubscribe, go to=20
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
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