This specification covers the requirements for the application of Z–PACK 2 mm HM Interconnection System for Board–to–Board Connections and provides information on the standard modules (Types A, B, C, A/B, D, E, F, and D/E) and modules with cavities for special contacts (Types L, M and N). Other parts of the Z–PACK 2 mm program are mentioned for reference only, as these applications are described in other separate application specifications. Refer to Paragraph 2.4. The Z–PACK 2 mm HM Interconnection System is a two part connector system intended to connect free boards (daughterboards, printed circuit (pc) boards) to a fixed board (motherboard, backplane or backpanel); and to feed this connection through the fixed board. Also the connection of the free boards and the connection of cables to pc boards allows for multiple configurations.