1. A method for determining communication characteristics of a metal cable suitable for use in a communication system, comprising: transmitting a wideband test signal on the metal cable; receiving an reflected signal as a result of the wideband test signal; determining an interval of the received reflected signal to be analysed, the interval corresponding to a part of the metal cable length; approximating the received reflected signal within the interval by a regression model; and determining communication characteristics of the metal cable based on the regression model.