A method for controlling electric power provided to an interface card, the interface card connecting one or more host devices to one or more network devices within a communication network, the method comprising: • providing a connecting device comprising a MOSFET which connects via a drain of the MOSFET the interface card to a power source via a source of the MOSFET thereby providing electrical power to the interface card in a normal operation mode; • providing a first semiconductor switching device and a second semiconductor switching device whose respective drains are connected to a fuse in parallel with an energy storage unit, wherein the energy storage unit is also connected to a gate of the MOSFET; • providing a failure detection unit (7a; 7b), the failure detection unit (7a; 7b) being linked to the connecting device; • upon detection of a signal indicative of a soft error or an over-voltage by the failure detection unit (7a; 7b), the connecting device changes to a safe state mode in which the connecting device cuts off the power source from the interface card, wherein • the safe state mode includes a first safe state mode as a temporary cut off mode in case of a soft error by charging the energy storage unit via the first semiconductor switching device and a second safe state mode as a permanent cut off mode in a case of an over-voltage by charging the energy storage via the second semiconductor switching device and blowing up the fuse, - the first safe state mode enabling the connecting device to reconnect the power source to the interface card thereby providing electrical power to the interface card by discharging the energy storage via the fuse, and - in the second safe state mode the connecting device is unable to reconnect the power source to the interface card due to the fact that fuse has been blown up. • providing a connecting device comprising a MOSFET which connects via a drain of the MOSFET the interface card to a power source via a source of the MOSFET thereby providing electrical power to the interface card in a normal operation mode; • providing a first semiconductor switching device and a second semiconductor switching device whose respective drains are connected to a fuse in parallel with an energy storage unit, wherein the energy storage unit is also connected to a gate of the MOSFET; • providing a failure detection unit (7a; 7b), the failure detection unit (7a; 7b) being linked to the connecting device; • upon detection of a signal indicative of a soft error or an over-voltage by the failure detection unit (7a; 7b), the connecting device changes to a safe state mode in which the connecting device cuts off the power source from the interface card, • the safe state mode includes a first safe state mode as a temporary cut off mode in case of a soft error by charging the energy storage unit via the first semiconductor switching device and a second safe state mode as a permanent cut off mode in a case of an over-voltage by charging the energy storage via the second semiconductor switching device and blowing up the fuse, - the first safe state mode enabling the connecting device to reconnect the power source to the interface card thereby providing electrical power to the interface card by discharging the energy storage via the fuse, and - in the second safe state mode the connecting device is unable to reconnect the power source to the interface card due to the fact that fuse has been blown up. - the first safe state mode enabling the connecting device to reconnect the power source to the interface card thereby providing electrical power to the interface card by discharging the energy storage via the fuse, and - in the second safe state mode the connecting device is unable to reconnect the power source to the interface card due to the fact that fuse has been blown up.