A system for use in automation technology comprising: an Ethernet-enabled field device configured to measure a physical variable, and to generate data representative of the measured physical variable; an Ethernet cable connectable/connected to said field device, wherein said Ethernet cable having PoE (Power over Ethernet) capability so as to both transmit the data from the field device as well as supply power to the field device over the Ethernet cable; and a power sourcing equipment with at least a first output port to which the Ethernet cable is connectable/connected, wherein the power sourcing equipment is arranged so that an input alternating voltage is transformed to a first alternating output voltage, which is provided at the first output port to supply power to the field device over the Ethernet cable.