An electrical connector includes a front housing and a contact module received in a cavity of the front housing having a frame assembly including a dielectric holder holding signal contacts. Each signal contact has a mating end and a terminating end. A ground shield is coupled to the dielectric holder for shielding the signal contacts. The ground shield has a ground pad at the mating end, mating beams extending from the ground pad for mating with corresponding header ground shields of a header connector and ground beams between corresponding mating beams for mating with corresponding header ground shields.