Each IOM provides system data connectivity through 6 Mini-SAS HD ports, capable of four 12Gbps SAS connections each. The IOMs are N+1 redundant, hot-swappable components. The IOMs are installed into the central bay from the top of the Chassis and connect to the drive board. The baseboard completes the connection to the Mini-SAS HD ports, which extend out the rear of the enclosure. Each IOM contains a primary and two SAS expander chips, and an out-of-band management (OOBM) chip that connects to the management port on the rear of the enclosure.