A Power over Ethernet, PoE, powered communication device, PD, (1, 31) comprising: a LAN port (2, 33) adapted for coupling a PoE LAN switch and for receiving data and power from the PoE LAN switch, a signature circuit comprising a configurable resistor unit coupled to the LAN port and adapted to generate a classification signal designating a power class of the PoE PD to be detected by the PoE LAN switch, wherein the configurable resistor unit comprises at least a first resistor (Rs) and at least a second resistor (Rs*) mounted in parallel to the first resistor (Rs) and selectively connectable to the signature circuit through a switch, wherein the power class is associated to a resistance state of the configurable resistor unit; the PoE PD further comprising an electronic control unit (5, 40), peripherals coupled to the electronic control unit, and a power module comprising a power converter adapted to supply power to the electronic control unit (5, 40) and to the peripherals in response to receiving power from the LAN port, wherein the power module further comprises a power switch configured to selectively couple the power converter to the LAN port, a sequence control module having an input coupled to the electronic control unit, a first output coupled to the configurable resistor unit and a second output coupled to the power switch, wherein the electronic control unit is configured to determine a power requirement of the communication device, detect a current resistance state of the configurable resistor unit and, in response to detecting that the power requirement overshoots a power class associated to the current resistance state of the configurable resistor unit: send a single trigger signal to the input of the sequence control module, wherein the sequence control module comprises a first delay line arranged between the input and the first output and a second delay line arranged between the input and the second output, so that the single trigger signal received by the input is transmitted to the configurable resistor unit with a first delay to cause reconfiguration of the configurable resistor unit to designate a higher power class, and to the power switch with a second delay to cause the LAN port to be transitorily put in the low-current state to be detected by the PoE LAN switch, and wherein the second delay is longer than the first delay. a LAN port (2, 33) adapted for coupling a PoE LAN switch and for receiving data and power from the PoE LAN switch, a signature circuit comprising a configurable resistor unit coupled to the LAN port and adapted to generate a classification signal designating a power class of the PoE PD to be detected by the PoE LAN switch, wherein the configurable resistor unit comprises at least a first resistor (Rs) and at least a second resistor (Rs*) mounted in parallel to the first resistor (Rs) and selectively connectable to the signature circuit through a switch, wherein the power class is associated to a resistance state of the configurable resistor unit; the PoE PD further comprising an electronic control unit (5, 40), peripherals coupled to the electronic control unit, and a power module comprising a power converter adapted to supply power to the electronic control unit (5, 40) and to the peripherals in response to receiving power from the LAN port, wherein the power module further comprises a power switch configured to selectively couple the power converter to the LAN port, a sequence control module having an input coupled to the electronic control unit, a first output coupled to the configurable resistor unit and a second output coupled to the power switch, wherein the electronic control unit is configured to determine a power requirement of the communication device, detect a current resistance state of the configurable resistor unit and, in response to detecting that the power requirement overshoots a power class associated to the current resistance state of the configurable resistor unit: send a single trigger signal to the input of the sequence control module, wherein the sequence control module comprises a first delay line arranged between the input and the first output and a second delay line arranged between the input and the second output, so that the single trigger signal received by the input is transmitted to the configurable resistor unit with a first delay to cause reconfiguration of the configurable resistor unit to designate a higher power class, and to the power switch with a second delay to cause the LAN port to be transitorily put in the low-current state to be detected by the PoE LAN switch, and wherein the second delay is longer than the first delay.