Configuration Guide User guide

664 FastIron Configuration Guide
53-1002494-02
Power over Ethernet overview
• When a PoE power supply is installed in the chassis
• When a PoE power supply is removed from the chassis
These events are described in detail in the following sections.
NOTE
A PoE power supply upgrade does not persist beyond a single power cycle. Therefore, an upgrade
will occur automatically each time a power supply is re-inserted in the chassis.
You can use the show inline power detail command to display detailed information about the PoE
power supplies installed in a FastIron PoE device. For more information refer to “Displaying detailed
information about PoE power supplies” on page 678.
CAUTION
The SX-POE-AC-PWR power supply is designed exclusively for use with the Brocade FSX PoE
devices. The power supply produces extensive power to support 802.3af and 802.3at
applications. Installing the power supply in a device other than the Brocade FSX PoE device will
cause extensive damage to your equipment.
Voltage selection during bootup
During bootup, the system will select the voltage mode (either 52 volts or 54 volts) of the power
supply with the lowest supported voltage as the voltage mode for all PoE power supplies installed in
the chassis. For example, if there is at least one power supply that supports 52 volts maximum,
then all power supplies will be configured to operate at 52 volts, even if other supplies are 54
volts-capable. Once the operating voltage is applied, the system will display and log a warning
message similar to the following:
Brocade(config)#
Power supply 1 (from left when facing front side) detected.
Power supply 1 (from left when facing front side) is up.
WARNING: PoE power supplies in slots 1 are down rev. PoE/PoE+ function will work,
but output power may be less than 50V under worst case load.
If all power supplies are 54 volts-capable, then all power supplies will be configured to operate at
54 volts. In this case, the system will not display or log a warning message.
Voltage selection when a PoE power supply is installed
When a PoE power supply is hotswapped into the chassis, the system will automatically adjust the
voltage to match that of the PoE power supply or supplies that are currently installed in the chassis.
The following examples describe how the voltage is selected when a PoE power supply is installed:
• 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.