A spring perch assembly for automatically centering a load applied to a spring is provided. Each module has a set of connecting legs, a set of connecting plates, an internal computer system and an internal power system. The transmitter node has a source for the supervisory channel and a multiplexer for combining the payload channels and the supervisory channel in order to form the optical wavelength-division multiplex signal, and the receiver node has a sink for the supervisory channel and a demultiplexer for separating the wavelength division multiplex signal into supervisory and the payload channels. The fibrous medium has a stacked structure constituted of a first fiber layer and a second fiber layer, which are electrically conductive.