The present invention features a non-peripherals-based processing control unit having an encasement module that is very small and durable compared to conventional computer encasement structures. The admission control procedure manages a first spectrum resource. The number of bits per cell may be decreased when fidelity is more important. The first switch includes a first terminal coupled to each of the first terminals of the first and third light emitting elements and a second terminal coupled to the first terminal of the second light emitting element.