a walking 0 test would send patterns of 1110, 1101, 1011, 0111. In this context, I would have to assume the channel always returns to 0000 between data words. This test would then have all but one line change. If the crosstalk sums in the unchanged line, then this would be a reasonable attempt at a worst case crosstalk test. It is less relevant with differential pairs, as it may cause the nearest line to transition from a 1 to a 0.
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a walking 0 test would send patterns of 1110, 1101, 1011, 0111. In this context, I would have to assume the channel always returns to 0000 between data words. This test would then have all but one line change. If the crosstalk sums in the unchanged line, then this would be a reasonable attempt at a worst case crosstalk test. It is less relevant with differential pairs, as it may cause the nearest line to transition from a 1 to a 0.