har-bus® HM AB and AB-friendly connectors

AB and AB-friendly connectors

Improved guiding on rear I/O applications with AB-modules.
In accordance with the equipment practice each front side arrangement of har-bus® HM connectors shall have at least one A-module per slot to ensure that the connector can accommodate ± 2 mm alignment tolerances in rack systems.
On some rear I/O arrangements the A-module's alignment capability cannot be utilised, because only B-modules are used for feed through. Consequently AB-modules were introduced to ensure guiding capabilities where formerly only B-modules were used. Those AB-modules represent a combination of A- and B-modules and are specified in CompactPCI by PICMG 2.0 Rev. 3.0 for certain rear I/O applications.

The AB-modules have guiding pegs similar (but not mating compatible to prevent mismating) to those of the A-module providing the same proven mating tolerances of ± 2 mm. The AB-modules have no coding center but are fully equiped with contacts in order to maintain the full density as per the B-modules.

The AB-female connector mates either with an AB-shroud or with AB-male connectors. The centered pin positions of the shielding rows of male connectors are simply equipped with short spill contacts (if standard connector and shroud are used). This prevents that the guiding peg of the female AB-module stubbing on the feed through contacts of the front side's fixed connector. These fixed connector loadings are called AB-friendly.
The AB-male connector will not be equiped with shielded contacts in the centre where the guiding peg will engage.

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