For the HARTING DIN 41612 series , each backplane connector has a different “Number of positions” specification. For example: For HARTING 02041601101, why does this part show "160 (96 + 64 Ground) " in Digi-Key’s website?
This means that this connector has 160 separated pins which contains 96 signal pins and 64 ground pins. Please note that these “ground pins” on the connector are not tied together with other pins. You can get a brief explanation about these pins’ function in its datasheet.
This connector is most often used in the VME64x bus system. VMEbus (Versa Module Europa bus) is a computer bus standard which is widely used for many applications and standardized by the IEC as ANSI/IEEE 1014-1987. It is physically based on Eurocard sizes, mechanicals and connectors (DIN 41612).