Cisco Catalyst 4500 Series, Software Configuration Manual

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 14 Environmental Monitoring and Power Management
Power Management
Switch (config)# end
Switch#
If you use the 1400 W DC SP power supply in combined mode, the inputs do not have to match.
Special Considerations for the 1400 W DC SP Triple Input Power Supply
Unlike the 1400 W DC power supply, the 1400 W DC SP power supply has submodules (multiple inputs)
that can be powered on or off. With Cisco IOS Release 12.2(25)EW, the output of the
show power command is modified to display the status of these submodules:
Switch# show power
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- ------
PS1 PWR-C45-1400DC DCSP1400W good good n.a.
PS1-1 12.5A good
PS1-2 15.0A bad
PS1-3 15.0A off
PS2 none -- -- -- --
Observer the following guidelines when using a 1400 W DC SP power supply with your Catalyst 4500
series switch:
• When you use two 48 V power rails to drive two power supplies, you might use cross-wiring to
connect the power supplies (to rails) to minimize the inrush current drawn during an initial power
up. In this situation, you should configure the switch in combined mode before you take a rail down
for maintenance.
•
Ordinarily, when configured for redundancy, two power supplies must be matched (have identical
inputs). For example, you might provide power to inputs 1 and 3 on both PS1 and PS2. If power
supplies are mismatched upon bootup, the right (second) power supply is in err-disable state.
In a matched redundant power supply configuration, if a power supply submodule fails, the other (good)
power supply provides power to its full capability.
Powering Down a Module
If your system does not have enough power for all modules installed in the switch, you can power down
a module, and place it in low-power mode. To power down a module, perform this task:
To power on a module that has been powered down, perform this task:
This example shows how to power down module 6:
Command Purpose
Switch(config)# no hw-module module num power
Turns power down to the specified module by
placing it in low power mode.
Command Purpose
Switch(config)# hw-module module num power
Turns power on to the specified module.