In addition to fast on-off timing, instructive information on an output wave such as an amplitude or a slope is transmitted through a small number of signal lines. The server is adapted to be connected to a network to permit remote storage and retrieval of data files from the memory. Correspondingly, the box has female thread, a sealing surface, and a shoulder surface which can mate or contact with the corresponding portions of the pin. Other embodiments are described and claimed. Clock recovery can include determining the phase offset value depending on a rounded phase rotation counter value.