Multi-stage vacuum distilling, cooling, and freezing processes for solution separation and seawater desalination are implemented through multi-stage vacuum distilling, cooling, and freezing systems. At least one of the metal compounds is a Group 15 containing metal compound and the other metal compound is preferably a bulky ligand metallocene-type catalyst. The large electronic components are arranged in a three-dimensional manner with respect to the mounting surface in such a manner that at least one of the large electronic components overlaps at least one of the large electronic components in a direction toward the mounting surface. The remote cabinet includes a circuit for receiving the power input from each subscriber and then distributing the power, required by the DSLAM load, equally among the subscribers. The signal amplitude information also is converted to a second control signal in response to which a supply voltage of the amplifier is controlled.