Interfacing by radio, in ERTMS / ETCS, Board-Earth and Earth-Board. Are respectively: 1) – the equipment onboard Balise Transmission Module (BTM) for the acquisition of informations from the ground; 2) – the equipment for the transmission of information from the ground to board (Boe or transponder. More generally also: 1) – board equipment for the Loop Transmission Module (LTM); 2) – the grounding circuits Loop Also: 1) – the onboard equipment Radio transmission module (RTM); 2) – the equipment of the ground system Radio Block Center (RBC)
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