Printed circuit board for a switching network

Claim 1

A circuit arrangement for switching network comprising: a supporting board; a plurality of groups of pairs of upper conductive tracks disposed on one surface of the board and extending substantially parallel to one another; input terminals connected to assigned groups of said upper conductive tracks, and output terminals connected to at least one remaining group; a plurality of multicontact switching means disposed on said one surface of the board and each having connection terminals for respective switching contacts; a plurality of interconnections passing through the board and arranged to form a first pattern for accommodating said connection terminals and a second pattern connected to respective upper conductive tracks in consecutive order to face corresponding interconnections of said first pattern; a plurality of lower conductive tracks disposed on the opposite surface of the board and connected between said interconnections for providing, together with said switching means, optional signal paths between said input and output terminals; two interconnections in said second pattern pertaining to a pair of tracks for a switching means having reversed order with respect to the order of interconnections on the adjacent pair of tracks in a group, for providing, by means of contacts of said switching means, a disconnectable cross-point between the conductive tracks for a selected signal path, and further comprising an additional interconnection passing through the board near a side of a track assigned to another switching means and being connected to a corresponding interconnection in said first pattern by a lower conductive track to form a permanent cross-point.