Adrian von Bidder wrote:
On Monday 30 January 2006 19:12, Simon Arlott wrote:
$ ntpq -c readvar ntp1.npl.co.uk
[...] system="arm-wrs-vxworks
Isn't vxworks some kind of real-time platform? Perhaps this is too exotic
and the ntpd code not tested on this?
I found a link to a description of their setup here:
http://www.symmetricom.com/About_Us/News/Press_Releases/June_8_2005.htm:
At
"http://www.symmttm.com/lp/NPL/index.asp?engine=pressrelease&keyword=npl";
they say:
"Having successfully utilized the hydrogen maser clock as well as four
Symmetricom time servers (two TymServe 2100s and two NTS-200s), NPL had
already become familiar with the reliability of Symmetricom products.
Hence, Whibberley choose Domain Time II software from Symmetricom to
monitor the time servers.
“We also researched other products just to ensure we would find the best
possible solution and guarantee accurate time for our customers,”
Whibberley said. “We could not find an alternative that even came close
to Domain Time II.”
In deploying the new system, NPL configured the time service to
originate from its hydrogen maser clock, traceable back to Coordinated
Universal Time (UTC) and verified by a cesium clock. The two TS2100s
synchronize to the extremely precise one pulse per second (1PPS) derived
from the output of the maser with time of day for the 1PPS inserted via
RS232 into the TS2100. The result is the TS2100’s become extremely
precise network time servers. The two NTS-200’s then peer to the
TS2100’s for accurate time and are available to serve time to the public
via the Internet. If a breakdown occurs along one of the systems, NPL
can re-route customers to the other system.
“This configuration gives us total control over the time we distribute,”
Whibberley said. “We have two working systems, and we don’t have to rely
on any outside sources such as the GPS (global positioning system).” "
Seems they are using those time server appliances running under VxWorks..
Regards,
Gordon
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