At the time of initial start-up, two or more storage units are started as a start-up control unit so that the total power consumption will not exceed specified electric power. The additional network activity obscures a profile of a user. This prioritization reduces the magnitude of delay anomalies arising from vias containing process related resistance defects. An interface region between an upper surface of the first thin film and a lower surface of the second thin film or an interface region between a lower surface of the first thin film and an upper surface of the second thin film, is doped with an impurity. The optical transmission unit is provided for contact-free transmission of light in at least one operating state at at least one location of the light guide path that differs from a location of a light input into the light input element and from a location of light output from the light output element.