[18299] in North American Network Operators' Group
Re: Interesting stratum 1 NTP clock
daemon@ATHENA.MIT.EDU (james@millhams.co.uk)
Thu Jul 9 16:10:23 1998
From: james@millhams.co.uk
To: nanog@merit.edu
In-reply-to: Your message of "Tue, 07 Jul 1998 10:42:45 EDT."
<199807071442.KAA11331@bifrost.seastrom.com>
Date: Wed, 08 Jul 1998 10:38:12 +0200
Robert E. Seastrom wrote:
> Actually, you're looking for two different things here:
>
> 1) a frequency standard that is traceable to a cesium or rubidium
> frequency source, with an output of 1 MHz, 10 MHz, 100 MHz, or
> whatever the PLL in the Cisco wants to see to discipline the line
> clocking, and
>
> 2) a time standard (synchronized to USNO) with a 1PPS output that is
> synchronized to the top of the second.
We're using (as a stratum 1 NTP clock) the Datum Inc. TymServe 2100 box, a
nice 1U rack-mount unit which receives GPS and outputs NTP and 1PPS
(satisfying 2 above) and also has a 10MHz output (satisfying 1 above). A
rubidium oscillator is an option on this box. See http://www/datum.com/ for
more details.
Disclaimer: No affiliation to Datum Inc... just a customer!
James
