A voltage booster and regulator usable with Dickson-type charge pump device is specifically adapted to maintain efficiency with both high and low supply voltages. The movable portion is movable between a first position where the shutter portion is positioned in the closed position. If an abnormality of a system is detected, the apparatus discontinues the control, and transmits a system abnormality signal to indicate the abnormality to other systems and to an operator. The satellite or a Network Control Center may receive and compile bandwidth request data from the terminals.