1. My prior post:

diodes only <-  dnly

2. Useful discussion here on Stack Exchange EE (which all EE's should be a
member of (as well as PICList :-) ))

https://electronics.stackexchange.com/questions/10864/building-a-passive-et=
hernet-hub-with-anti-parallel-diodes?rq=3D1

Comment on diodes here.
1N4148 or 1N914 "should" work.

https://electronics.stackexchange.com/questions/150601/choosing-diodes-for-=
a-passive-ethernet-hub


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https://www.eeweb.com/circuit-projects/building-a-passive-ethernet-hub
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