One aspect of the present invention relates to a solar power unit comprising a frame, configured to be integrated into a building structure, for supporting a solar panel, the solar panel for generating a power signal, and a front cover for securing the solar panel to the frame. Here, a block of 2N-by-2N signal values is extracted so that sampled signal values exist in all the pixel locations of the block. In some instances, the location information is manually entered. The switch fabric includes at least one multiplexed optical interconnect coupling the routing nodes.