Method and system for monitoring the condition of a supply network

A method for monitoring the condition of a supply network, the said supply network for the transmission of electrical power and for data transmission using a PLC (Power Line Communication) system adapted to comprises for enabling a low-cost as possible, yet fast and early identification of faults, the steps of: repeatedly obtaining at least one parameter of several components of the PLC system by means of a data collection unit, wherein the parameters each contain information on the utility of a segment of the power supply network for data transmission, Storing the related by the data collection unit parameter as parameter data, Forming a time course of the parameter data, Determining the state and / or a change in state of the supply network by means of an evaluation unit by using the time course of the parameter data. A corresponding system is indicated.