The High-Performance Process Manager Module (HPMM) provides communications through the I/O Link Interface with Input/Output Processors (IOPs). High-Performance I/O Link Card Consists of an I/O Link processor, SRAM through which the processor communicates with the Communications/Control card, an I/O Link driver/receiver interface.
The HPM I/O Link module is the HPM’s interface to its I/O subsystem. The I/O subsystem consists of the redundant I/O Link and up to 40 IOPs.