Power Management For The Catalyst 4500 Series Switches - Cisco 4500M Software Manual

Power Management
These power supplies are incompatible with Catalyst 4500 series switches. Since Power over Ethernet
(PoE) is not supported on the Catalyst 4948 switch, only a limited wattage is needed. (For information
on PoE, see
switch, the EEPROM on the power supplies can be read by the system software even if the supply is not
powered on. You may mix AC and DC power supplies.
Power Management Modes
The Catalyst 4948 switches support the redundant power management mode. In this mode, if both power
supplies are operating normally, each provides from 20/80 to 45/55 percent of the total system power
requirements at all times. If one power supply fails, the other unit increases power to 100 percent of the
total power requirement.

Power Management for the Catalyst 4500 Series Switches

You can select from several different power supplies to ensure that you have enough power for the
modules installed in your switch. The Catalyst 4500 series switches support the following power
supplies:
•
•
All Catalyst 4500 series switch AC-input power supplies require single-phase source AC. The source AC
Note
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 have its own
dedicated branch circuit: 20A for North America and circuits sized to local and national codes for
International locations.
When you insert power supplies in your switch, use power supplies that are of the same wattage. If you
mix power supplies, the switch will use the one it recognizes first and ignore 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.
Software Configuration Guide—Release 12.2(25)EW
7-4
Chapter 8, "Configuring Power over
Fixed Wattage—This power supply always delivers a fixed amount of PoE and system power.
– 1000 W AC (not recommended on the Catalyst 4510R switch, PoE not supported)
1400 W AC—Data-only and does not support PoE
–
Variable Wattage—These power supplies automatically adjusts the wattage to accommodate PoE
and system power requirements.
1300 W AC—Supports PoE.
–
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
Supply" section on page 7-10
– 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 power in the range 400 W-1400 W depending on the lines powered.
See "Special Considerations for the 1400 W DC SP Triple Input Power Supply" section on
page 7-11 for more information.
2800 W AC—Supports up to 1400 W of system power and up to 1400 W of PoE.
–
Chapter 7 Environmental Monitoring and Power Management
Ethernet.") When you insert power supplies in your
"Special Considerations for the 1400 W DC Power
for more information.
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