A drawer for use in a dispensing cabinet is comprised of a tray movable between an open position and a closed position. The method includes forming a layer of elongated nanostructures, and at least partially coating the elongated nanostructures with a coating. The narrow wave-shaped passage is defined by a first inner wall having a first undulating surface opposite and spaced apart from a second inner wall having a second undulating surface mirroring the first undulating surface. Merely after successfully detecting a feasible channel assignment optimization path, IBS and its neighboring base stations initiate a channel switching process, such that useless channel switching may be avoided. The conversion apparatus electrically connects Twinax cables to respectively different trace layers without crossing over or disturbing the relative positions of the Quadrax diagonal pairs for very efficient high-speed data transfer from four wire Quadrax to two wire Twinax cables.