A state-based admission control method for networks carrying inelastic applications traffic such as exemplary VoIP traffic. A second stage receives the first and second line voltages and outputs a second differential current in response thereto on third and fourth lines having respective third and fourth line voltages. The example method also deposits a high-K dielectric as a gate dielectric, deposits a metal layer, planarizes the metal layer to a height of a hard oxide, forms a nitride layer on the planarized metal layer, and patterns the nitride layer using a hard mask for forming a pattern to form a nitride layer pattern. The signature may be generated using the KEK. The thickness of the coating is controlled by submerging the functional plate in the buffered dopamine solution while the pH value of the dopamine solution is maintained at a value sufficient for polymerization of the dopamine during that time period, and then transferring the plates to a solution having a pH value that is insufficient to sustain the polymerization reaction. A technique for use in the absence of pairing constraints is also provided, as is a pin-pairing technique.