17The controller also features a Cache Backup Module (CBM), consisting of a supercapacitor and a Flash Backup Module (FBM).NOTEThe management port supports only 100Mb and 1000Mb (1Gb) speeds.Host boards are optional add-on components! There are two host board slots, if youare installing a host board for the first time, please install it to the slot on the left (nextto SAS exp. Ports).WARNINGThe controller module contains no user-serviceable components. The only time youshould remove the controller is to install/ replace the CBM or a failed controller. Thecontroller is built of sensitive components and unnecessary tampering may damagethe controller.Controller Module of Expansion EnclosuresThe expansion controller contains a circuit board within a metal canister, interfaced throughhot-swap docking connectors at the back-end. Three SAS wide ports on the interfacefaceplate connect to a managing Unified Storage System or other expansion enclosures.
