An electrical connector system comprising: a backplane connector including a housing comprising bores and a plurality of backplane contact assemblies, the housing configured to hold the plurality of backplane contact assemblies within corresponding bores, the backplane contact assemblies being movable relative to the housing defining float mounted contact assemblies, the backplane contact assemblies each having a center contact and an outer shell surrounding the center contact, the backplane contact assemblies being configured to be terminated to coaxial cables; a daughtercard connector coupled to the backplane connector, the daughtercard connector being configured to be mounted to a daughtercard circuit board, the daughtercard connector comprising a plurality of daughtercard contact assemblies and a housing holding the plurality of daughtercard contact assemblies, wherein each daughtercard contact assembly includes a center conductor (130, 134) including a mating contact and a board contact, is coupled to a corresponding backplane contact assembly and is configured to be directly terminated to the daughtercard circuit board, the housing of the daughtercard connector being electrically conductive and having a plurality of ground pins extending from a mounting end of the housing of the daughtercard connector, wherein multiple of said ground pins surround each of the center conductors of the daughtercard contact assemblies to enhance electrical shielding around the center conductors and are configured to be terminated to the daughtercard circuit board, the ground pins configured to electrically connect the housing to a ground plane of the daughtercard circuit board; wherein the connector system further includes a plurality of interconnects positioned in bores of the backplane connector between corresponding backplane contact assemblies and daughtercard contact assemblies,, each interconnect comprising an interconnect contact having opposed mating ends (534, 536) which interface with the mating contact and a center contact such that the interconnects create a direct electrical path between the backplane contact assemblies and the daughtercard contact assemblies, the bores further receive portions of corresponding daughtercard assemblies such that mating interfaces of the backplane contact assemblies and mating interfaces of the daughtercard assemblies are positioned within corresponding bores. a backplane connector including a housing comprising bores and a plurality of backplane contact assemblies, the housing configured to hold the plurality of backplane contact assemblies within corresponding bores, the backplane contact assemblies being movable relative to the housing defining float mounted contact assemblies, the backplane contact assemblies each having a center contact and an outer shell surrounding the center contact, the backplane contact assemblies being configured to be terminated to coaxial cables; a daughtercard connector coupled to the backplane connector, the daughtercard connector being configured to be mounted to a daughtercard circuit board, the daughtercard connector comprising a plurality of daughtercard contact assemblies and a housing holding the plurality of daughtercard contact assemblies, wherein each daughtercard contact assembly includes a center conductor (130, 134) including a mating contact and a board contact, is coupled to a corresponding backplane contact assembly and is configured to be directly terminated to the daughtercard circuit board, the housing of the daughtercard connector being electrically conductive and having a plurality of ground pins extending from a mounting end of the housing of the daughtercard connector, wherein multiple of said ground pins surround each of the center conductors of the daughtercard contact assemblies to enhance electrical shielding around the center conductors and are configured to be terminated to the daughtercard circuit board, the ground pins configured to electrically connect the housing to a ground plane of the daughtercard circuit board; wherein the connector system further includes a plurality of interconnects positioned in bores of the backplane connector between corresponding backplane contact assemblies and daughtercard contact assemblies,, each interconnect comprising an interconnect contact having opposed mating ends (534, 536) which interface with the mating contact and a center contact such that the interconnects create a direct electrical path between the backplane contact assemblies and the daughtercard contact assemblies, the bores further receive portions of corresponding daughtercard assemblies such that mating interfaces of the backplane contact assemblies and mating interfaces of the daughtercard assemblies are positioned within corresponding bores.