A wire connecting unit for an electrical connector for communication and data transmission systems includes a circuit board with a free and a near end and having four pairs of contacts mounted in a cantilever manner. The wire connecting unit has specific contact configurations that reduce crosstalk, attenuation, propagation delay, and other electrical and magnetic properties that interfere with communication and data transmission. In one embodiment, a first row of contacts extends generally upwardly and backwardly from the free end of the printed circuit board toward the near end, and a second row of contacts placed further from the free end of the printed circuit board than the first row of contacts extends generally upwardly and backwardly from the free end toward the near end. Each adjacent contact can have only a single push foot that extends laterally and outwardly from its proximal end, remote from the other contact in the respective pair, allowing the contacts to be placed relatively close together to further reduce the electrical and magnetic properties that interfere with communication and data transmission.