In a method for inspecting the layout of a printed circuit board, a component to be checked is determined from an electronic layout diagram of the PCB, and a power transmission line which may be serving that component is selected. The steam generator has a pipe for spraying water onto the heating means; its operation is controlled according to the humidity in the baking chamber according to a first parameter PX1 and a second parameter PX2. The compositions are made by combining a curative, an uncured fluorocarbon elastomer, a wear reducing additive and a thermoplastic material, and heating the mixture at a temperature and for a time sufficient to effect vulcanization of the elastomeric material, while mechanical energy is applied to mix the mixture during the heating step. The network device may calculate the weightings, for example, based on a maximum number of subscriber sessions supported by each of the tunnel termination devices.