The present invention is drawn to an electrically \u201cclosed\u201d method and apparatus for transmitting and receiving data signals over a high voltage power line. The game is played on a gaming table, with a regular standard deck of cards consisting of 52 cards, and with between one and seven players and a dealer. , high order aberrations such as described by Zernike polynomials. The level shifting apparatus further includes a latch loop configured to receive feedback the output signal to an input of the output inverter, wherein the edge detector is configured to selectively interrupt feedback of the output signal to the input of the output inverter.