A method for using a confidence based ranking algorithm is described. A knob body mounted to the cabinet includes an axial bore which receives a magnetic disk and an insert sleeve. The second lens group includes positive and negative lenses aspherically shaped on at least a side thereof facing the object and having a convex or concave surface facing the object, the negative lens being positioned on the image side of the positive lens. When in a first configuration, a first incoming telephone line becomes the subscriber primary telephone line at one or more of the second RJ connectors.