Accusys ExaRAID A24U-SS - Manual (Page 47)

Maintenance
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3. Secure the BBM by fastening 4 screws on both sides of the controller(B).
4. Connect the small end of the cable to the connector port of the BBM.
Then connect the other end to the controller.
For A24R controllers, follow the same procedures to install the second
BBM on the allocated slot in the other controller.