A system for providing power to a powered device, comprising: a power over Ethernet communication link power supply path responsive to a first power supply signal received from a power over Ethernet communication link, for powering the powered device, an auxiliary power supply path responsive to a second power supply signal from an auxiliary power source, for powering the powered device, a power converter having an input responsive to the second power supply signal, and an output for producing a converter output signal, a control circuit configured to control the power converter so as to provide power supply switching between the power over Ethernet communication link power supply path and the auxiliary power supply path, wherein the control circuit is configured to enable a user to select between powering the powered device from the power over Ethernet communication link and powering the powered device from the auxiliary power source when both the power over Ethernet communication link power supply path and the auxiliary power supply path are available for powering the powered device, and wherein the control circuit is configured to control the power converter so as to power the powered device in accordance with user's selection, a minimum load current circuit in the power over Ethernet communication link power supply path that is controlled by the control circuit that provides load current required to maintain power signature, MPS, operation of the power over Ethernet communication link, thereby providing seamless switching between power from the auxiliary power source and the power over Ethernet communication link, interfacing and switching circuitry in the power over Ethernet communication link power supply path that is configured to present a valid detection signature required from the powered device, the power converter is controlled, according to the user selection, to produce an output voltage value lower than a voltage value from the power over Ethernet communication link power supply path in order to enable the power over Ethernet communication link power supply path to power the powered device, and to produce the output voltage value greater than the voltage value from the power over Ethernet communication link power supply path in order to enable the auxiliary power supply path to power the powered device, wherein the power over Ethernet communication link power supply path is connected to a common point of connection in a first case via a first diode and in a second case via a first transistor and the output of the power converter is connected to said common point of connection in the first case via a second diode or in the second case via a second transistor, and wherein said common point of connection is further connected to the powered device. a power over Ethernet communication link power supply path responsive to a first power supply signal received from a power over Ethernet communication link, for powering the powered device, an auxiliary power supply path responsive to a second power supply signal from an auxiliary power source, for powering the powered device, a power converter having an input responsive to the second power supply signal, and an output for producing a converter output signal, a control circuit configured to control the power converter so as to provide power supply switching between the power over Ethernet communication link power supply path and the auxiliary power supply path, wherein the control circuit is configured to enable a user to select between powering the powered device from the power over Ethernet communication link and powering the powered device from the auxiliary power source when both the power over Ethernet communication link power supply path and the auxiliary power supply path are available for powering the powered device, and wherein the control circuit is configured to control the power converter so as to power the powered device in accordance with user's selection, a minimum load current circuit in the power over Ethernet communication link power supply path that is controlled by the control circuit that provides load current required to maintain power signature, MPS, operation of the power over Ethernet communication link, thereby providing seamless switching between power from the auxiliary power source and the power over Ethernet communication link, interfacing and switching circuitry in the power over Ethernet communication link power supply path that is configured to present a valid detection signature required from the powered device, the power converter is controlled, according to the user selection, to produce an output voltage value lower than a voltage value from the power over Ethernet communication link power supply path in order to enable the power over Ethernet communication link power supply path to power the powered device, and to produce the output voltage value greater than the voltage value from the power over Ethernet communication link power supply path in order to enable the auxiliary power supply path to power the powered device, wherein the power over Ethernet communication link power supply path is connected to a common point of connection in a first case via a first diode and in a second case via a first transistor and the output of the power converter is connected to said common point of connection in the first case via a second diode or in the second case via a second transistor, and wherein said common point of connection is further connected to the powered device.