The present invention concerns a process for preparing calcium carbonate pigment from calcium oxide andor calcium hydroxide and carbon dioxide in the presence of water. The RSSI signal represents the strength of any signal current being received, and if the RSSI signal falls below a given threshold level, digital circuitry associated with the back-end circuitry of the receiver system is disabled. The disposable administration set is injection molded as a single integral piece. Because the discharge path that is associated with the data signal includes a greater amount of conductance, it can perform the discharge operation at a faster rate, even where the input logic level does not exceed the voltage of the system voltage supply. A method of fabrication of such optical interconnections using optical fiber, a laser or photodetector and etched mirror and etched V-shaped grooves. The substrate mounting stage is disposed in the substrate processing apparatus and has a substrate mounting surface on which a substrate is mounted.