1. A substrate configured to be received by an electrical connector, the substrate comprising:a trailing end and a leading end spaced from the trailing end in a direction of insertion of the substrate into the electrical connector;
at least one surface;
at least one electrical signal contact pad carried by the at least one surface and defining a trailing edge and a leading edge spaced from the trailing edge in the direction of insertion, the electrical signal contact pad having a signal contact pad length from the leading edge to the trailing edge that is less than another signal contact pad length of a signal contact pad of another substrate that is configured to be received by the electrical connector by an offset distance of approximately 0.2 mm; and
a lead-in contact pad disposed between the at least one electrical signal contact pad and the leading end, wherein the lead-in contact pad has a contact pad length greater than a lead-in contact pad length of the another substrate.