12-8
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 12 Environmental Monitoring and Power Management
Power Management
–
1400 W DC—Supports up to 1400 W of system power and variable amounts of PoE, depending
on the input feed to the power supply. See “Special Considerations for the 1400 W DC Power
Supply” section on page 12-18 for more information.
–
1400 W DC Service Provider—Uses up to three lines (12.5 A, 15 A, 15 A) of DC input and
delivers varying amounts of system power ranging from 400 W to 1400 W depending on the
lines powered. See “Special Considerations for the 1400 W DC SP Triple Input Power Supply”
section on page 12-19 for more information. (PoE not supported)
–
4200 W AC and 6000 W AC—Supports varying amounts of system power and PoE depending
on the number of inputs powered and input voltage.
Note All Catalyst 4500 series switch AC-input power supplies require single-phase source AC. The source AC
can be out of phase between multiple power supplies or multiple AC-power plugs on the same power
supply because all AC power supply inputs are isolated. Each chassis power supply should ideally have
its own dedicated branch circuit sized to local and national codes.
When you insert power supplies in your switch, use power supplies that are of the same wattage.
Multi-input power supplies such as 1400 W DC triple-input, 4200 W AC, and 6000 W AC have
additional restrictions. Read the sections on special considerations for these power supplies. If you mix
power supplies, the switch uses the one with the higher wattage and ignores the other power supply. The
power supply status displays as err-disable and the summary displays as all zeros (0) for wattage values
in the output for the show power command.
The following example shows the output for the show power command for mixed power supplies:
Switch# show power
Power Fan Inline
Supply Model No Type Status Sensor Status
------ ---------------- --------- ----------- ------ ------
PS1 PWR-C45-2800AC AC 2800W good good good
PS2 PWR-C45-1000AC AC 1000W err-disable good n.a.
*** Power Supplies of different type have been detected***
Power supplies needed by system :1
Power supplies currently available :1
Power Summary Maximum
(in Watts) Used Available
---------------------- ---- ---------
System Power (12V) 328 1360
Inline Power (-50V) 0 1400
Backplane Power (3.3V) 10 40
---------------------- ----
Total Used 338 (not to exceed Total Maximum Available = 750)
Switch#
Power Management Modes for the Catalyst 4500 Switch
The Catalyst 4500 series switches support two power management modes:
• Redundant mode—Redundant mode uses one power supply as a primary power supply and the
second power supply as a back-up. If the primary power supply fails, the second power supply
immediately supports the switch without any disruption in the network. Both power supplies must
be the same wattage. A single power supply must have enough power to support the switch
configuration.
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