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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter7 Environmental Monitoring and Power Management
Power Management
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 sub-modules (multiple
inputs) that can be powered on or off. With Release 12.2(25)EW, the output of the show power command
is modified to display the status of these sub-modules:
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 -- -- -- --
Keep in mind 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 employ 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 will be in err-disable state.
In a matched redundant power supply configuration, if a power supply sub-module fails, the other (good)
power supply will provide power to its full capability.
Special Considerations for the 4200 W AC Power Supply
The 4200 W AC power supply has two inputs: each can be powered at 110 or 220 V.
The output of the show power command for the 4200 W AC power supply is similar to that of 1400 W
DC triple-input power supply (that is, the status of the sub-modules (multiple inputs) is displayed). With
these two power supplies, you can distinguish sub-module “failed” versus “off,” and the status of the
sub-modules (good, bad, or off):
Switch# show power
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------- -------
PS1 PWR-C45-4200ACV AC 4200W good good good
PS1-1 220V good
PS1-2 off
PS2 PWR-C45-4200ACV AC 4200W bad/off good bad/off
PS2-1 220V good
PS2-2 220V bad
Power supplies needed by system : 1
Power supplies currently available : 2