Power Supply Planning Considerations
With a Redundant Network 9000 chassis configuration, you can obtain redundancy for a system
drawing a maximum of 300W of power (two 150 W power supplies when using P/S 130 power supply
modules). When using the power supply worksheets, you must ensure that the communication
options that you install in the Network 9000 chassis can be adequately powered by a total of 300W.
Installing Power Supplies
When using a Redundant AC Power Input Module, each individual module shares some of the load
during normal operation. The power input module in slot 1 provides AC power to the power supplies
in power supply slots 1, 2, and 3. The power input module in slot 10 provides AC power to the power
supplies in power supply slots 4 and 5. When one power input module fails, the power supplies in the
associated power supply slots will go into a fault condition. The power supplies that are associated
with the functioning power input module take over the entire load.
To make sure that each segment of the split midplane receives power, install power supplies in
pairs into power supply slots in the following order, rather than the order shown in the Network
9000 Chassis Hardware Installation and Maintenance Guide: P/S 3, P/S 4, P/S 2, and P/S 5.
Figure 3 shows this order.
Xyplex
Network 9000
Xyplex
Network 9000
slot 10
slot 11
slot 12
slot 13
slot 14
slot 15
P/S 4
P/S 5
Xyplex
Network 9000
Xyplex
Network 9000
slot 4
slot 5
slot 6
slot 7
slot 8
slot 9
P/S 2
P/S 3
Xyplex
Network 9000
slot 1
slot 2
slot 3
P/S 1
First Pair.
First Pair.
Second Pair.
Second Pair.
Figure 3. Installing Power Supplies.
The actual installation of power supply modules is uncomplicated and is fully described in the
Network 9000 Chassis Hardware Installation and Maintenance Guide. Each unused power supply
slot is covered by a blank panel. To install a new power supply module, remove the blank panel
and insert the power supply module. Secure the module with the Phillips head captive screw.
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