The present invention provides a polymerizable compound represented by the following formula, a polymerizable composition that includes the polymerizable compound and an initiator, a polymer obtained by polymerizing the polymerizable compound or the polymerizable composition, and an optically anisotropic article that includes the polymer. The system uses SPC, in systems having feedback control based on control sensor data, to identify errant reads and ensure that such errant reads are not used in the applicable feedback loop. The processor is able to achieve this by generating the one or more bus clock signals so that the lowest of the bus clock signal frequencies in power-save mode is lower than the lowest of the bus clock signal frequencies in performance mode. The steering column is grounded via the support shaft, the end member, the conductive member and the fixed side plate. In this way, a fast, wavelength dependent, optical switch is provided, capable of use in WDM switching applications.