Abstract: An electrical connector includes: a substrate having plural holes; plural contacts mounted in the corresponding holes, the plural contacts including a first row of contacts arranged as a pair of signal contacts flanked by two ground contacts, a second row of contacts having four ground contacts on one side of the first row of contacts, and a third row of contacts having four ground contacts on another side, each contact including a body and an upper arm; and a coupling element interconnecting the two ground contacts of the first row to selected ground contacts of the second and third rows, wherein the upper arm of each of the plurality of contacts has a contacting convex facing upward, and the four ground contacts of the second row are connected side by side and the four ground contacts of the third row are connected side by side.