Nowadays, in the automotive sector, there is a need to transfer a large amount of data in the shortest possible time to ensure the functioning of systems such as ADAS or Infotainment and there’s also the necessity to reduce the weight and complexity of wiring especially when considering a zonal architecture. To satisfy these requests, it’s developed a single-pair Ethernet switch with Power over Data Line that exploits the 100Base-T1 protocol described by the IEEE 803.2 standard. This implies that data and power share the same twisted pair, not necessarily shielded, with the possibility of exploiting all the upper layers, already widely developed as regards the transmission of packets, which are based on Ethernet.