"By assigning pins between signals as return paths (grounds), unwanted coupling between signal pins can be minimized. For high speed applications a 1:1 signal to ground ratio is typically optimal. Pin mapping for SE applications would then be S-G-S-G, while DP applications would use DP-G-DP-G.
These pin assignments provide a good performance versus density trade-off. Of course, more return paths could be added between signals to increase isolation for applications where crosstalk must be extremely low. However, this greatly reduces signal density of the interconnect."
Source: Samtec Signal Integrity Book
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