Erling Paulsen <[EMAIL PROTECTED]> writes: > Hello. > > > I have a Symmetricom Syncserver S250 as primary NTP-server. > This box has PPS-output via a BNC connector. I need to get this PPS signal > onto a rs232 connector. > > Are there any converter kits that can do this, or do I need to make my own > "box" for doing this? > > I have setup a secondary server (ntpd on FreeBSD) that will use PPS to > discipline its clock via /dev/pps (on a serial com-port). > > Any hints on how to get the PPS from the BNC(coax)-output on the primary > server to the com-port on the secondary server would be appreciated.
I have seen many designs. One is at www.kernel.org/pub/linux/daemons/ntp/PPS/TTLtoRS232.ps.gz and uses a CA3140E op-amt. Another is at http://www.eecis.udel.edu/~mills/ntp/html/pps.html, but dated 1992. You can also use a MAX232. Hope this helps. Jon Kåre _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
