Connect RAID Array Enclosure to a host via hot-pluggable RAID Controller Module from Dell . It has one SAS In port connector which provides a direct connection to the host. This RAID controller module connects to the enclosure midplane via the two midplane connectors on its internal (rear) panel. The PS/2 serial connector provides serial connection to the RAID controller, normally used for administrator password reset. This product has been tested and validated on Dell systems.