[ntp:questions] Convert PPS signal from BNC to RS-232!

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Thu Mar 1 20:48:15 UTC 2007

>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.

Just wire it up and give it a try.  The PPS output is a good
solid TTL signal.  It will work fine unless you are going
very long distances.

Their data sheet says it will drive 50 ohms.  If you have a scope
handy, see what it looks like.  Without a 50 ohm terminater, it
is likely to be 2x the TTL level.  Who knows what "TTL" means
these days.  It's probably CMOS, either from 5V or from 3.3V.

These are my opinions, not necessarily my employer's.  I hate spam.

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