Ich nutze keine FRSky Telemetry /Taranis und kenne daher nur die Beschreibung des Wiki:
Virtual Pin 103: RSSI (Received Signal Strength Input) input pin voltage (SBus connector output pin). This is the voltage measured by the RSSI input pin on the SBUS-out connector (the bottom pin of the 2nd last servo connector on the 14 connector servo rail). Can alternatively serve as SBus out but not yet implemented.