An apparatus and method of determining a signal code. The method comprises forming a carbon containing layer beneath the gate dielectric and source and drain regions of a MOS transistor. The knife has a high penetration angle preferably of 45 degrees which permits the blade to enter high trash surface cover with little tendency to plug due to trash accumulation. The interconnection fabric interconnects the plurality of duplex switches so that each duplex switch is connected to every other duplex switch used in the interconnection fabric by a single connection.