A device may be configured to receive information regarding a call center. Each air duct has a first opening and a second opening at two ends of the air duct to allow air to enter and exit the air duct, respectively. The delinking router also reduces energy and spectrum consumption of the mobile communication channel by turning off its radio frequency module after routing its data to the fixed communication channel. The dispersion system broadens the narrow laser pulse into a wide laser pulse. Thus, a printed wiring board design method is provided in which placement of and wiring for a new bypass capacitor or the like can be implemented and a region satisfying restraint items from the design rule can be clearly displayed as a new input enable region on a CAD screen.