David Rawling wrote: > Looking around, it appears that Meinberg offer some PCIe cards > nowadays (rather than serial connected units) but I can't seem to > find anyone who has configured these or similar as a stratum 0 > source. They appear to offer Windows and Linux drivers.
Yes, I'm the maintainer of the driver software. Please note the driver software for Linux on the Meinberg download page is outdated. We are working on a new release, and a stable pre-release is also available. There's also a stable pre-release driver available for FreeBSD, BTW. > Are Meinberg still the go-to for this stuff? Does this appear as a > PCIe device delivering time and ... PPS source somehow? What are > people running if you've set up the hardware in the last (say) 6 > months - and is FreeBSD on bare metal still the best way to go for > the stratum 0 source? Meinberg GPS PCI cards provide a 1 PPS output signal, in case you need for some other purpose, but you don't need it get accurate time for NTP. With external GPS receivers you only know the exact second changeover when a 1 PPS slope occurs, but with the Meinberg GPS PCI cards applications can retrieve the current time very accurately, at high resolution, whenever they need it. The driver package provides an API call which reads both the time from the card and the current system time as close as possible after each other, and these timestamp pairs can be fed into ntpd via ntpd's SHM driver, thus yielding hery good accuracy. Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: [email protected] Phone: +49 (0)5281 9309-14 Fax: +49 (0)5281 9309-30 Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322 Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung Web: http://www.meinberg.de _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
