This slide shows a small excerpt of the many combinations of high speed applications and their applied bus configurations. By no means does it imply that all shaft encoders will be utilizing the same synchronous half-duplex data link. The same application could be using an asynchronous full- or half-duplex link. Note that in high speed point-to-point data links it is common to supply the entire data link from a single power supply source, while the nodes of a multipoint bus often receive their supply locally. One interesting fact is that the timing of a high speed transceiver is not always determined by the data rate required for a certain application. In Profibus, for example, the maximum data rate is specified with 12Mbps, although the majority of applications operate in the range from 200kbps to 2Mbps. Despite this rather low data rate requirement, the Profibus inventors have demanded that new transceiver designs are capable of supporting data rates of up to 40Mbps, simply to ensure precise driver and receiver switching.