The apparatus and technique of the invention constitutes a hydraulic jack system for pushing sections of new pipe which, in turn, pushes a sleeve-cone expander arrangement to break up the old pipe and define a straight path for the new pipe. According to the invention, after said heating zone, on the path of the molten or still partly molten fibre, the extension tube is provided with a thermophoretic collector which comprises one or more cooled means to thermophoretically deposit, on its surface, impurities contained in the gas flow surrounding the fibre. All the receiving nodes in turn retransmit the packet to all the nodes within range of them. Furthermore, the data analysis performed by the device can comprise applying therapy rules to the data. In at least one embodiment, different types of credits can be earned andor used for different types of communications.