Brocade FastIron Ethernet Switch Administration Guide - Manual (Page 267)

• If a 54 volt-capable power supply is installed in a chassis that is operating with 52 volt-capable power
supplies, the newly installed power supply will be set to operate at 52 volts.
• If a 54 volt-capable power supply is installed in a chassis that is operating with 54 volt-capable power
supplies, the newly installed power supply will be set to operate at 54 volts.
• If a 52 volt-capable power supply is installed in a chassis that is operating with 54 volt-capable power
supplies that are actively providing power, the system will reject the newly installed power supply
since it cannot safely operate with the 54 volt-capable power supplies. In this case, the 52-volt power
supply will be powered OFF and an error message similar to the following will display on the console.
device(config)#
Power supply 1 (from left when facing front side) detected.
Power supply 1 (from left when facing front side) is up.
Shutting down power supply in slot 1 because it is not compatible with the existing
PoE power supplies. Please remove and replace.
When the system is next reloaded, the power supply voltage will be selected as described in the section
Voltage selection during bootup on page 266.
• If a 52 volt-capable power supply is installed in a chassis that is operating with 54 volt-capable power
supplies that are not actively providing power, the system will configure the power supplies to
operate at 52 volts. In this case, the newly installed 52-volt power supply will not be powered OFF
and a message similar to the following will display on the console.
NOTE: Automatically downgraded all PoE power supplies to 52V.
Voltage selection when a PoE power supply is removed
If a 52 volt PoE power supply is removed from the chassis, the system will survey the remaining power
supplies to determine if they are 54 volts-capable. If the remaining supplies are 54 volts-capable and
the system is not currently providing power to any PDs, then the software will upgrade the voltage of all
supplies to 54 volts. The system will display and log a message similar to the following:
NOTE: Automatically upgraded all PoE power supplies to 54V.
However, if the system is currently providing power to one or more PDs, the system will not upgrade the
voltage level. When the system is next reloaded, the power supply voltage will be selected as described
in the section
Voltage selection during bootup on page 266.
Power over Ethernet cabling requirements
The 802.3af and 802.3at standards currently support PoE and PoE+ on 10/100/1000-Mbps Ethernet
ports operating over standard Category 5 unshielded twisted pair (UTP) cable or better. If your network
uses cabling categories less than Category 5, you cannot implement PoE without first upgrading your
cables to Category 5 UTP cable or better.
Supported powered devices
Brocade PoE devices support a wide range of IP powered devices including the following:
• Voice over IP (VoIP) phones
• Wireless LAN access points
• IP surveillance cameras
The following sections briefly describe these IP powered devices.
Voltage selection when a PoE power supply is removed
FastIron Ethernet Switch Administration Guide 267
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