The PIM-Parallel-IO is part of the PMC family of modular I/O components. The purpose of the PIM-Parallel-IO is to facilitate rear panel IO. A PIM Carrier is mounted to the underside of the backplane. The Pn4 [PMC] IO is passed through the backplane connectors to the PIM Carrier and to the installed PIM devices. Most PIM Carriers have two PIM sites which correspond to the two PMC's mounted to the host card. The PIM (PMC Interface Module) carrier supports the flexible PIM scheme for PMC rear I/O.