An electrical jack includes a housing having a mating end configured to receive a mating plug. A plurality of signal contacts are arranged in differential pairs, and each of the signal contacts carries a signal from or to a plug contact in the mating plug. A plurality of compensation contacts are provided....http://www.google.de/patents/US7074092?utm_source=gb-gplus-sharePatent US7074092 - Electrical connector with crosstalk compensation
