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Dynamic upgrade of PoE power supplies
NOTE
This section applies to the FSX 800 and FSX 1600 chassis with PoE power supplies.
PoE+ requires higher power levels than standard PoE. In a chassis running software release 07.2.00
or higher, POE power supplies (SX-ACPWR-POE) are upgraded dynamically to 52 or 54 volts,
depending on the maximum operating voltage the power supplies are capable of. The preferred
voltage mode for PoE+ is 54 volts.
For safety reasons, all PoE power supplies installed in the chassis must operate at the same voltage
mode, either 52 volts or 54 volts. The system selects the voltage mode of the power supply with the
lowest supported voltage as the voltage mode for all PoE power supplies installed in the chassis. For
example, in an FSX 800 chassis with one 52-volt capable PoE power supply and one 54-volt capable
PoE power supply, both power supplies are configured dynamically to operate at 52 volts.
PoE+ voltage selection occurs during each of the following events:
• When the device is powered ON or is rebooted
• 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. An upgrade occurs
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 section Displaying
detailed information about PoE power supplies on page 364.
CAUTION
The SX-POE-AC-PWR power supply is designed exclusively for use with the BrocadeFSX 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 BrocadeFSX PoE device will
cause extensive damage to your equipment.
Voltage selection during bootup
During bootup, the system selects 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 are configured to operate at 52 volts, even if other supplies are 54 volts-capable. Once
the operating voltage is applied, the system displays and logs a warning message similar to the
following:
device(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 are configured to operate at 54 volts.
In this case, the system does not display or log a warning message.
Dynamic upgrade of PoE power supplies
344 FastIron Ethernet Switch Administration Guide
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