A base station apparatus for operation as part of an access network of a mobile telecommunications network includes; a housing; a radio interface unit and a core network interface unit in the housing; a network line section between the radio interface unit and the core network interface unit; and a measuring apparatus, operatively connected to the network line section. The measuring apparatus is configured to detect at least one line parameter of the network line section, the at least one line parameter including a line parameter from the group of line parameters consisting of: the input impedance of the network line section; the insulation value of the network line section; the capacitance of the network line section; and the inductance of the network line section.