| 1. A printed circuit panel comprising N input terminals and N output terminals, the input terminals and the output terminals
being interconnected by a network of tracks, the tracks being interconnected by a plurality of individual two input and two
output connection devices disposed between adjacent portions of two tracks,
wherein for each of said individual two input and two output connection devices, the two inputs are electrically connected
to the two outputs firstly by two direct connections constituted by said track portions, and secondly by two crossed-over
branch connections, such that each input terminal of the N input terminals of the panel is electrically connected to all of
the N output terminals and each output terminal of the N output terminals of the panel is electrically connected to all of
the N input terminals, and
wherein the number and the disposition of said devices being selected in such a manner as to enable all possible wiring combinations
to be implemented by interrupting in each individual connection device either the direct connections or the branch connections.
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