User's Manual

Carrier Grade Chassis Management Controller User’s Guide Addendum 9
Figure 1-3. No Redundancy with three PSUs in the chassis
A PSU failure brings other PSUs out of Standby mode, as needed, to support
the chassis power allocations. If you have 4 PSUs, and require only three, then
in the event that one fails, the fourth PSU is brought online. A chassis can
have all 6 PSUs online.
When you enable DPSE, the extra PSUs may be placed in Standby mode to
increase efficiency and save power. For more information, see
Dynamic Power
Supply Engagement
.
Power Budgeting for Hardware Modules
Figure 1-4 illustrates a chassis that contains a six-PSU configuration. The
PSUs are numbers 1-6, starting on the left-side of the enclosure.
Power
Supply
#1
Power
Supply
#2
Power
Supply
#3
Empty
Slot
#4
Empty
Slot
#5
Empty
Slot
#6
DC Power Grid #1
Chassis DC Power Bus
Single Power Grid:
No protection against grid or power supply failure