A connector is provided that includes a housing and the housing supports a plurality of wafers. Each wafer supports a terminal and adjacent signal wafers are configured so as to provide broad-side coupled terminals. A pair of signal terminals can be surrounded on both sides by ground terminals that offer shielding so as to help isolate one signal pair from another signal pair. The geometry of the wafers can be adjusted so as to provide a tuned transmission channel. The resultant tuned transmission channel can be configured to provide desirable performance at high signaling frequencies of 12-16 GHz or even higher signaling frequencies such as 20 GHz.