--------
In message <20190321062751.4c65b406...@ip-64-139-1-69.sjc.megapath.net>, Hal 
Murray writes:

>I don't know how well they will work for something like a PPS.  Somebody 
>should try it.  The signal pattern is mostly trying to be friendly to the PLL 
>that does clock recovery and/or the AGC that sets up the switching level.

If we are only inside a lab, look at TOSLINK which can be made to
do interesting stuff if you play a bit with it.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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