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84 The PCB Magazine • March 2014 differences explained above on differential pairs; Figure 7 show a differential pair marked "A" and "B", the "A" trace runs directly over a glass fibre, whereas trace "B" runs over a resin rich area. The consequent signal velocities mean that these two traces cannot behave as intended as the resultant signals will arrive at their destination skewed, or out of sync. Figure 8 shows the signal from a Figure 6: glass fabric images. Figure 7: micro dk effect on differential pair. DEVELOPMENTS IN GLASS YARNS AND FABRIC CONSTRUCTIONS continues