Additional information on the phase of an external clock signal is obtained by using clock signals to determine if a phase difference between an external clock signal and a first internal sampling clock signal is less than a pre-selected value. An audio module is operable to process markers embedded within an audio stream, wherein the markers comprise structured audio commands. In this way, the muxponder is able to aggregate optical data signals having different protocols andor different data rates. The piezoelectric array can be extended and shaped into two-dimensional and three-dimensional hydrophone arrays. The platform lift trailer is highly adaptable so that a wide variety of lifts can be mounted to the platform lift trailer and thus to smaller motor vehicles.