Substrates with a coating, in particular a metal-containing coating, are freed of coating in some regions, in particular in the edge region, with the aid of plasma directed onto the coated side of the substrate. The LAN connector comprises a flexible portion formed outside a modem-cable-connector occupied space within a housing having a size accommodating the LAN cable connector being inserted thereinto, and a stopper portion formed within the modem-cable-connector occupied space. The power supply also includes the capability of reading a program from a device that is plugged into the power supply’s output connector.