A plug assembly includes a shielded housing having an upper shell, a lower shell and a center plate held between the upper and lower shells. The upper shell has at least one upper plug chamber, and the lower shell has at least one lower plug chamber. The center plate is positioned between, and provides shielding between, the upper and lower plug chambers. A plurality of plugs are received in corresponding plug chambers. Each of the plurality of plugs have a plug insert with shield members defining plug quadrants, and each of the plurality of plugs have a plurality of terminals held by the plug insert. The plurality of terminals are arranged in pairs in each of the plug quadrants.