Hello,
I'm new to this project and I like it very much.

I would like to design a simpler (may be not necessary as much KNX compliant?) transceiver design.
Is the circuit explained more in detail somewhere? If not, I put some questions here:

1. What is the purpose of the 150mH inductor? Does it limit the DC current slew rate on the bus caused by the bus-powered device?

2. What is wrong with a simpler TX having only a MOSFET and resistor? See http://www.guiott.com/KNX/C-Hardware/KNXschematic.pdf and STMKNX https://www.st.com/resource/en/datasheet/stknx.pdf seems to have similar design (MOSFET inside and 68 ohm resistor outside).

Pavel