Installation guide

Manual No. 771971 B-1
Appendix B
Intelligent Battery Backup Unit
Product Description
The Intelligent Battery Backup Unit (IBBU) is an add-on module that
provides power to the DAC960PG PCI to Ultra-SCSI RAID Controller
cache memory in the event of a power failure. The battery backup module
monitors the write back cache on the DAC960PG, and provides power to the
cache if it contains data not yet written to the drives when power is lost.
The DAC960PG controller, with the IBBU installed, together occupy only
one PCI slot on the host backplane.
Features
Some of the new features of the IBBU include:
• Gas gauge circuit for battery charge monitoring
• Quick charge to replenish a drained battery
• Support for low-power EDO ECC RAM modules
IBBU Components
Figure B-1. IBBU Components