mats@enea.se (Mats Josefsson) (03/20/91)
We have been running xntpd on a number of HP 9000/800 machines for a while. Since we have no connection to the internet, we have been synchronizing to the builtin clock on one of our hosts. We are quite happy with the synchronization, but since the clock drift is about one second per day we would like to get more precision in the absolute time keeping. Through a dialup modem we can reach the Swedish PTT's cesium clocks which would make it possible to get time readings to an accuracy of about +/- 20 ms (they say). Since it's a dialup line we can't expect to have a continous connection. We must use some type of polling scheme. My question is: Which is the best way to use this clock source to periodically adjust the time of our network of machines? An absolute accuracy of a few seconds would be sufficient, we just want to avoid doing the adjustment manually. Should we poll the cesium clock a few times every day and set the clock of our current stratum 1 machine via settimeofday()? Do we have to write our own clock driver? In this case will it be sufficient to poll the cesium clock just a few times a day. Mats Josefsson (mats@enea.se) Enea Data AB Sweden
Mills@udel.edu (03/20/91)
Mats, You might consider running NTP with timer.unik.no and/or timer.nta.no, which are primary servers synchronized directly with the Norwegian cesia and LORAN-C. Dave