From 74a6db37073ee9c74326d02218c569dbaf2690b9 Mon Sep 17 00:00:00 2001 From: uhi22 Date: Mon, 28 Oct 2024 19:09:42 +0100 Subject: [PATCH] docu: Foccci 5.1 transmit amplitude and receive sensitivity --- doc/plcSignalAmplitude.md | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/doc/plcSignalAmplitude.md b/doc/plcSignalAmplitude.md index a87c437..ebe0146 100644 --- a/doc/plcSignalAmplitude.md +++ b/doc/plcSignalAmplitude.md @@ -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