A management system for controlling a digital subscriber loop telecommunications network identifies radio frequencies used by wireless transmitters in the vicinity of each electrical connection, and controls transmission frequencies carried over the respective digital subscriber loops to prevent transmission on frequencies in which nearby radio transmitters are operating. Each light source section is constituted by a luminous body and a reflector comprising an ellipsoidal surface having one focal point located near the center of gravity of the luminous body. Also included is a method for providing uplink data transmission over an access link. The interface also includes a first input area for receiving commands from the resource administrator for deriving a value for at least one of the access information items.