A cable card assembly includes a circuit card having mating conductors at a mating end for mating with a mating electrical connector and circuit conductors at s cable end. The cable card assembly includes cables having signal conductors and cable shields. The cable card assembly includes a contact assembly coupled to the circuit card and coupled to the cables and a contact holder holding signal contacts. Each signal contact includes a base tab terminated to the corresponding circuit conductor and a mating tab terminated to the corresponding signal conductor. The cable card assembly includes a ground bus separate and discrete from the contact assembly and coupled to the contact assembly. The ground bus is electrically connected to the cable shields to electrically connect the cable shields of the cables.