A coolant pump of an internal combustion engine, having a pump casing, in which a pump shaft is rotatably supported by a water pump bearing assembly and an impeller connected in a rotationally fixed manner to the pump shaft is associated with an intake space. The hollow element may also have a leading edge that tapers to a defined point. The device uses a light energy source that emits wavelengths in the near-infrared portion of the spectrum, preferably in the range of about 1. An influence of noise on the synthesized transmission channel response is reduced. In a bulk-IN transaction, before the host sends an IN packet, the controller pre-fetches data and stores the data in the buffers until all the buffers are full or a requested data length has been achieved; the pre-fetched data are then sent to the host after the host sends the IN packet.