A method of monitoring a process of powering an electronic device through a cable assembly is proposed. The cable assembly comprises a cable which is connected between a power supply and the electronic device. The method comprises generating a synchronization signal, generating a test signal based on the synchronization signal and applying the test signal to one end of the cable, detecting a response signal at the one end of the cable, the response signal resulting from applying the test signal to the cable assembly, and determining, based on the response signal and the synchronization signal, a first and a second quantity indicative of a real part and an imaginary part of the impedance of the cable assembly, respectively. Further, an apparatus for monitoring a process of powering an electronic device through a cable assembly is proposed.