A panel assembly for reflecting and shielding rays of a light source, includes a panel, a light-reflecting member attached to the panel, and a light-shielding board received in the light-reflecting member. In the coating, glass flakes are embedded to which silver is bonded. An authorization mechanism stores and retrieves authorization data from the trusted section of the global data store. Furthermore, the returns and are operable to vary a characteristic of the removal of the cooling fluid. Embodiments of the present invention improve the bandwidth utilization rate while implementing the transparent transporting of the LAN signal in the OTN.