choosing diodes for a passive ethernet hub
The diodes he's chosesn are massively over-specified for the task  10-base-2 is only 20 MHz and those are 1GHz parts. ordinary signal diodes like 1N914 or 1N4148 should work just fine.

it'd probably even work with resistors instead of the diodes, somewhere 22 to 47 ohm feels about right.

Else BA479 is avalable from mouser.com for less than a dollar each seems to meet all the important performance figures of the BA243 diode