KNX transceiver twisted pair networks (KNX TP1-256) can use NCN5121 as a reciever-transmitter Integrated Circuit (IC). NCN5121 embeds both PHY and MAC layers and handles the transmission and reception of data on the bus. It generates from the unregulated bus voltage stabilized voltages for its own power needs as well as to power external devices. NCN5121 assures safe coupling to and decoupling from the bus. Various monitors (bus voltage, current, temperature...) are made available through an analog pin.