An upstream bandwidth allocation scheduler is provided for use within a Line Termination unit in a point to multi-point data communications network in order to service multiple Network Termination units. The no-load detecting circuit may be applied in switching mode power supplies or other circuits. Provided on the upstream side end portion of the downstream side conveyer portion is a rotating operation transport device for supporting and transporting the article such that the amount of rotation of the article by the downstream side conveyer portion is greater than or equal to the amount of rotation caused by the downstream side conveyer portion. The outermost node is connected to the first node, the intermediate node is connected to the third node, and the innermost node is connected to the second node.