A high-speed optical data link includes a system circuit board, a first ASIC coupled to convey electrical information to and from up level data management circuits, and a second ASIC electrically coupled to the first ASIC. The ventilation system is mostly built-in to the toilet so that it is unobtrusive and attractive looking, however the active parts are contained in an simple housing that is unobtrusively and removably attached to the surface of the toilet base for simplified installation, maintenance, and replacement as needed. The echo from the object is encoded as perturbations on flexible cilia-like transducers that are otherwise undergoing limit cycle oscillations. Also, they are useful in connection with diagnostic tests.