  Propagation of monochromatic electromagnetic waves in free space results in a
widening of the spectral line. On the contrary, propagation preserves
monochromaticity in the case of acoustic waves. In this case, the propagation
can be modelled by a linear invariant filter leading to attenuations and phases
changes. Due to the Beer-Lambert law, the associated transfer function is an
exponential of power functions with frequency-dependent parameters. In recent
papers, we have proved that the acoustic propagation time can be modelled as a
random variable following a stable probability distribution. In this paper, we
show that the same model can be applied to the propagation in coaxial cables.
