The present application discloses systems, methods, and articles of manufacture for transferring data andor data over a communication link. The frame has at least first and second frame assemblies that are reconfigurable to place the filter selectively in: a) a first predetermined operative state; and b) a second predetermined operative state. An electric melter furnace is utilized for receiving intermediate carbon-containing metallized iron from the pre-reducing step, which is fed directly and continuously into a central interior area of the electric melter, with heating of the carbon-containing metallized iron in the electric melter under elevated temperatures of about 1300 C. An inverter input is connected to the input of the level shifting circuit to form an inverted level shifting input.