Exact mechanical specifications will vary widely depending on the type of module and the location where it will be integrated into the system. However, there are two predominant applications for the expansion module: a mezzanine board for CH or RP profiles or a RTM to attach to a backplane.
Mezzanine boards will follow the guidelines outlined in the associated standards for the desired connector. However, in instances where this is not feasible due to physical constraints, the module should be cognizant of the final position and orientation when mated into the system. In particular, interference between component bodies on the mezzanine and on the host profile shall be avoided, and any thermal considerations should be addressed as well.
For more information, refer to the Mechanical Specification.