GIG-ARRAY

CONNECTOR SYSTEM

4.6 CROSSTALK
Single-pair active crosstalk is the crosstalk measured at one pair when asignal is injected onto a second pair. The backward or near-end crosstalk is the crosstalk measured at the same end as the injected signal. The forward or far-end crosstalk is measured at the end opposite the injected signal. The forward crosstalk is so small in the mezzanine industrial connectors that the val- ues are negligible. Likewise, the single active horizontal and diagonal cou- pling is also negligible. Therefore, only the near-end multi-pair active crosstalk is presented.The multi-pair active crosstalk is the maximum crosstalk that can be meas-ured at one pair of the connector when a signal is injected in other neighbor- ing pairs of the connector. The multi-pair active crosstalk is calculated as the sum of the absolute values of the single-pair active crosstalk. This means that the multi-pair active crosstalk must be interpreted as the absolute worst-case value. Figures 4-32 thru 4-36 show crosstalk at 15mm, 20mm, 25mm, 30mm and 35mm board-to-board heights. Figure 4-32 Multi_Active NEXT @ 100ps 15mm stack height Figure 4-33 Multi_Active NEXT @ 100ps 20mm stack height Figure 4-34 Multi_Active NEXT @ 100ps 25mm stack height Figure 4-35 Multi_Active NEXT @ 100ps 30mm stack height Figure4-36 Multi_Active NEXT @ 100ps 35mm stack height 33