Abstract: A novel frontplane structure for use with a plurality of parallelly mounted printed circuit boards having respective sets of a plurality of electrical connectors mounted to the front edge of the printed circuit boards is disclosed in which a multi-layer printed circuit board is mounted to a sheet metal sub-chassis that includes integral injector/ejector devices which, by means of a cam action, produce a reduction in the mechanical effort required to mate the frontplane with each of the connectors contained on the plurality of printed circuit board assemblies installed into a card cage assembly or computer chassis to which the frontplane is to be connected is disclosed. A plurality of high density printed circuit connectors are mounted to the multi-layer printed circuit board for interconnecting with the sets of connectors mounted to the front edges of the printed circuit board assemblies.