1. A blind plug with at least one data plug unit, which is configured for a connection to a counter data plug unit, wherein the data plug unit comprises an output unit, which is configured to indicate a power supply capability of the counter data plug unit, wherein the data plug unit has at least one printed circuit board comprising contacts for a contacting with counter contacts of the counter data plug unit, wherein the output unit permits a determination whether the counter data plug unit is a classic Ethernet terminal or a Power over Ethernet terminal, wherein the output unit comprises at least one lighting member and wherein the printed circuit board comprises at least one first conduction path, which connects a first one of the contacts to a first terminal of the lighting member in an electrically conductive manner, and at least one second conduction path, which connects a second one of the contacts to a second terminal of the lighting member in an electrically conductive manner, the lighting member being connected in an electrically conductive manner to at least two of the contacts via the first conduction path and the second conduction path, wherein the output unit comprises a further lighting member and the printed circuit board comprises at least one further first conduction path connecting, in an electrically conductive manner, a further first one of the contacts to a further first terminal of the further lighting member, and comprises at least one further second conduction path connecting, in an electrically conductive manner, a further second one of the contacts to a further second terminal of the further lighting member, the further lighting member being connected in an electrically conductive manner to at least further two of the further contacts via the further first conduction path and the further second conduction path.