Owner`s manual

Options include the VAXBI I/O interface, battery backup unit, and in-
cabinet disks. The VAXBI card cages are located in the upper third of
the cabinet on the left side, as viewed from the front of the cabinet. The
disks and battery backup unit are located beneath the blowers and are rack-
mounted. The first of these two options to be installed is placed adjacent
to the AC power controller.
VAXBI Card Cages and Power Regulators
The optional VAXBI I/O interface is a one-channel bus housed in two
6-slot VAXBI card cages. Two power regulators supply power to the
VAXBI backplane. A clear latched door protects the components housed
in the VAXBI card cages and helps to direct the airflow over the modules.
Indicator lights on the modules can be viewed through this clear front door.
The protective door must be closed for normal operation, as it controls the
power supply to the card cages.
Additional VAXBI card cages can be added to a system by installing a
VAXBI expander cabinet (see Appendix D). See the VAX 6000 Platform
Service Manual for more information on the VAXBI card cages.
Battery Backup Unit
The battery backup unit supplies power to sustain the system for up to 10
minutes following a power interruption. Ride-through capability for up to
1 second is provided. The system control panel indicates the status of the
battery backup unit.
Disks
The system cabinet provides space for two SA7x building blocks (8 RA7x
drives), two RA92 disk drives, or two SF7x arrays (8 RF7x drives), or some
combination. The disk control panel is accessed through an opening in the
cabinet front door.
NOTE: Installation of a battery backup unit allows only one disk enclosure
to be installed in the system cabinet.
System Components 2–17