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docu: Foccci 5.1 transmit amplitude and receive sensitivity

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doc/plcSignalAmplitude.md
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@ -44,3 +44,23 @@ This would be 9dB between transmitter output and receiver input.
4Vpp. Each output (TX+ and TX-) sit at ~1.6V statically, and move 1V up and 1V down. So the differential voltage
reaches from -2V to +2V, which is 4Vpp.
8. Foccci 5.1 transmit level
with 120ohm termination
270mVpp
9. Foccci 5.1 receive limit test
- Foccci sees the EVSE, starting to become instable, if 400mVpp -36dB. This is 400mVpp / 64 = 6mVpp.
- Foccci sees single messages, if 400mVpp -42dB. This is 3mV.
- Foccci does not see the EVSE (modem goes to sleep) if 400mVpp -44dB. This is 400mVpp/158 = 2.5mVpp.
# Attenuation calculator
https://www.digikey.de/de/resources/conversion-calculators/conversion-calculator-attenuator
* -6dB is half voltage
* -12dB is quater voltage
* -20dB is tenth voltage