User's Manual

Power Management 249
• 2+2 AC Redundancy Level — at least two PSUs are connected to
each AC grid.
Figure 8-2. 2+2 Redundancy Level
• 3+3 AC Redundancy Level — three PSUs are connected to each power
grid. Since three PSUs can power the entire enclosure, this configuration is
unaffected by the complete failure of one AC grid without loss of power to
the enclosure.
Figure 8-3. 3+3 Redundancy Level
Power
Supply
#1
Power
Supply
#2
Empty
Slot
#3
Power
Supply
#4
Power
Supply
#5
Empty
Slot
#6
AC Power Grid #1
AC Power Grid #2
Chassis DC Power Bus
AC Power Grid #2
AC Power Grid #1
Chassis DC Power Bus
Power
Supply
#1
Power
Supply
#2
Power
Supply
#3
Power
Supply
#4
Power
Supply
#5
Power
Supply
#6