A communication system includes first and second circuit card assemblies mated such that first and second PCBs move relative to each other along a board mating axis parallel to a slot in the first PCB with the first PCB oriented perpendicular to the second PCB and with first and second mating ends of first and second electrical connectors oriented parallel to the board mating axis. The first and second circuit card assemblies are mated such that the first electrical connector and the second electrical connector move relative to each other along a connector mating axis perpendicular to the board mating axis. First mating interfaces of first contacts are mated to second mating interfaces of second contacts in a contact mating direction non-parallel to the board mating axis and non-parallel to the connector mating axis.