A cable card assembly for an electrical connector includes a circuit card having upper and lower surfaces and extending between a cable end and a mating end with mating conductors at the mating end and cable conductors at the cable end. Cables are terminated to the circuit card that include signal conductors, ground shields surrounding the corresponding signal conductors, and drain wires electrically connected to the corresponding ground shields. The signal conductors are terminated to corresponding cable conductors. The cable card assembly includes a ground block separate and discrete from the circuit card and coupled to the circuit card. The ground block includes drain wire channels receiving corresponding drain wires. The ground block is electrically conductive to electrically connect the drain wires.