Patent ID: 7230506
Filing Date: 2007-06-12
Classification: H01P,H05K

Abstract:
1. A backplane for a communications system, that includes a plurality of differential signal line pairs, comprising: a first differential signal line pair of the plurality of differential signal line pairs having a first differential signal line and a second differential signal line, wherein each differential signal line, of the first differential signal line pair, includes a first end and a second end; a second differential signal line pair of the plurality of differential signal line pairs having a third differential signal line and a fourth differential signal line, wherein each differential signal line, of the second differential signal line pair, includes a first end and a second end; a plurality of vias, including first, second, third, fourth, fifth and sixth vias, wherein each via couples to a corresponding connector terminal; the first differential signal line providing a communications path for a first forward signal, wherein the first end of the first differential signal line is coupled to the first via and the second end of the first differential signal line is coupled to the second via; the second differential signal line providing a communications path for a first reverse signal, wherein the first end of the second differential signal line is coupled to the third via and the second end of the second differential signal line is coupled to the fourth via; the third differential signal line providing a communications path for a second forward signal, wherein the first end of the third differential signal line is coupled to the fifth via and the second end of the third differential signal line is coupled to the sixth via; and, wherein the first via is spatially located adjacent to the fifth via to cause the second forward signal to have a first amount of coupling to the first forward signal and wherein the fourth via is spatially located adjacent to the sixth via to cause the second forward signal to have a second amount of coupling to the first reverse signal and wherein, without adding coupling specifically for the purpose of reducing crosstalk, the first and second amounts of coupling cause the coupling between the second forward signal and the first forward signal to be substantially equal to the coupling between the second forward signal and first reverse signal.