[time-nuts] Looking for advice to get a submillisecond setup

[Tim Shoppa]

Not sure how small your University is, Matt. But most telco/networking
departments will have an NTP infrastructure already, that may include local
GPS clocks. If you look around at the ntp servers on the university LAN and
find one or more stratum-1's with millisecond or less delay, you probably
already have the source you want.

Tim N3QE

On Thu, Feb 19, 2015 at 12:11 PM, Matt <mattator at gmail.com> wrote:

> Hi,
>
> My university would like to have a <1ms precise source of time to do
> some networking experiments (measure one way propagation delays
> etc...). So I wandered on the internet to find the best choice with a
> budget of ~1000€ (~1100 American dollars).
> I've been overwhelmed by the number of possibilities (atomic
> clocks/GPS signal etc...) and as no price appear on the seller
> websites, it's difficult to rule out options.
>
> I hope it's within the scope of the mailing list but I would like some
> advice on good hardware with the previous constraint (budget ~ 1100 $,
> precision < 1ms). We can install an antenna in clear horizon. From
> what I gather, the GPS option looks a good choice but then I am unsure
> what the underlying NTP server would look like. It would be in a
> computer room (some temperature variation is expected, even though
> there is cooling).
> Meinberg looks great but I believe they are too expansive for our budget.
> I've seen that one cheap http://www.gpsntp.com/gps-ntp-services.php
> but this feedback
> (
> http://www.reddit.com/r/sysadmin/comments/23e72i/gps_ntpserver_rack_mount_device_minireview/
> )
> is not fantastic.
> I also read good comments on Garmin 18 hardware but it is so cheap I
> wonder if it precise enough.
>
> I wonder if we should buy a specific box or if we could not plug the
> antenna to a linux box with gpsd/NTPd on it ?
>
> Any advice ?
>
> Best regards
> Matt
>
> Nb: the FOSDEM talks did a good job advertising your mailing list :)
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