The document discusses IBM's 5796 and 7314 expansion units for the System i POWER6 model 570. It provides details on the #5796 PCI expansion drawer, the #7314 rack enclosure that can hold two #5796 drawers, and the #6446 and #6457 adapters used to connect the #5796 drawers to the 12X loop. It also discusses supported 12X cable lengths and requirements for using the short-run vs. long-run adapters.