Cisco Catalyst 4500 Series - Power Management for the Catalyst 4948 Switches

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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
IEEE 802.3az Energy Efficient Ethernet
To power on a module that has been powered down, perform this task:
This example shows how to power down module 6:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# no hw-module module 6 power
Switch(config)# end
Switch#
Note After you enter no hw-mod mod x power command and OIR the linecard, the configuration persists and
is valid for any slot in the chassis it is applied to. You observe the same behavior in the active and standby
supervisor engines
Power Management for the Catalyst 4948 Switches
You can select from AC or DC power supplies to ensure that you have enough power for your switch.
The Catalyst 4948 switches support the following power supplies:
• 300 W AC
• 300 W DC
These power supplies are incompatible with Catalyst 4500 series switches. Because Power over Ethernet
(PoE) is not supported on the Catalyst 4948 switch, you only need a limited wattage is needed. (For
information on PoE, see Chapter 13, “Configuring Power over Ethernet.”) When you insert power
supplies in your 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 for the Catalyst 4948 Switch
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.
IEEE 802.3az Energy Efficient Ethernet
Note EEE is supported on WS-X4748-UPOE+E and WS-X4748-RJ45-E.
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.