Abstract: Stacked receptacles in a connector that each provide side-by-side differential signal contacts, are attached to a circuit board without additional width to accommodate multiple layers of differential signals by using connector wafer inserts that rotate the side-by-side positioned differential signal contacts to front-to-back contacts.

Abstract: An electrical connector includes a dielectric connector body which is formed with vertically aligned upper and lower terminal holes. A tail guiding part projects rearwardly from a rear side of the connector body adjacent to a bottom side thereof and is formed with a tail guiding slot for passage of the downwardly extending tail portions of upper and lower terminals which are mounted in the upper and lower terminal holes, respectively. The tail guiding part has a pair of vertically stepped guide walls that confine a narrow and a wide section in the tail guiding slot and that provide shoulder faces between the two sections. The tail portion of the upper terminal has an enlarged part to contact against the shoulder faces, thereby preventing the tail portion of the upper terminal from moving toward the tail portion of the lower terminal.