An electrical connector includes a housing and a plurality of contact modules and ground plates held by the housing. Each contact module includes left and right signal wafers stacked next to each other along a stack axis. The signal wafers include electrical terminals held by a dielectric body. The electrical terminals have mounting contacts protruding from the dielectric body at a mounting face of the housing. The electrical terminals of at least one of the signal wafers in each contact module are jogged toward the other signal wafer such that the mounting contacts of each contact module align in a column. Each of the ground plates is disposed along an outer side of a corresponding contact module.