The invention relates to a method for decoding an audio signal, to allow an audio signal to be compressed and transferred more efficiently. The end-point node autonomously determines a path satisfying predetermined transmission conditions as an optimal pathway of said wavelength path, on the basis of cumulative span information transmitted over the respective plural pathways from the starting-point node to the node of interest. 5 to 3% in the 90 through 150\xb0 C. In this case, the opening command is instigated only if at least one defined allowable precondition is present.