FIG. 16A is a top plan view of a two layer substrate carrier having a differential and common mode filter mounted to bus traces on a top surface of the carrier; and FIG. 16B is a front cross-sectional view of the two layer substrate carrier of FIG. 16A; and FIG. 16C is a side sectional view of the two layer substrate carrier of FIG. 16A; and FIG. 16D is a front cross-sectional view of an alternate