A fuel cell power module is provided. The ventilation control system utilizes a user-friendly user interface for the display of patient data and ventilator status. The width of the lateral overlap of the weakly p-doped region is determined in function of the predetermined ratio between the lateral current component and the vertical current component. 3 micrometers and a porosity between 45% and 80%. The sink device has a second link layer that retries unsuccessful data communications over the full duplex control channel until a second maximum retry limit of the second link layer is reached, where the second maximum retry limit is different than the first maximum retry limit.