FreeLists / si-list / [SI-LIST] differential pairs on backplane connectors

["Stephen Greenhalgh" <Stephen.Greenhalgh@xxxxxxxxxxx>]

When using standard pin matrix backplane connectors (for example, 2mm hard 
metric), the conventional wisdom was to assign two adjacent pins in the same 
row for a differential pair. This meant that the right angle (daughter board) 
connections were of equal length and geometry.
However, the newer connectors, designed specifically for differential pairs 
(for example, FCI Airmax VS, Amphenol GcX or ERNI ERmet ZD) use pairs of pins 
in the same column. This seems surprising, since it appears to mean that there 
is an inherent imbalance between the two connections. Perhaps this is taken 
into account in the connector design? Can anyone provide an explanation or 
clarification, please?

Stephen Greenhalgh

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