A level shifter circuit includes a first voltage conversion circuit and a second voltage conversion circuit. The data processing system comprises at least one processor for processing data based on multiple threads, at least one controller unit for controlling the communication between said at least one processor and an external peripheral device connected to said at least one controller unit. The effective compound is preferably reserpine, administered in a dosage of less than about 0. Information elements for a request can be driven, for example, using a double pumped signaling mode in which two information elements are driven during one bus clock cycle. A transparent top substrate is then formed over the bottom substrate. For determining the position of the mobile station with greater accuracy the base station is provided with calculating means which are responsive to the measuring equipment to determine the direction from the base station to the mobile station by calculating the relations between the signal levels of the signals for the respective beams.