Allied Telesis AT-IE510-28GSX-80, Installation Manual

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AT-IE510 Series Installation Guide
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Figure 7. Switch ID LED
The switch flashes the letter “F” for fault on the ID LED if it encounters one
of the following problems:

An alarm has been triggered.

A cooling fan has failed.

The input voltage on one or both of the power supplies is outside
the normal operating range.

The internal temperature of the switch has exceeded the normal
operating range and the switch may shut down.
Note
You can use the SHOW SYSTEM ENVIRONMENT command in the
command line interface to identify the source of the problem.
The states of the LED when the switch is operating in the low power mode
are shown in Figure 8.
The switch is booting up.
The switch has encountered a fault condition.
The switch is operating as a stand-alone unit, with the ID
number 0.
The switch has an ID number of 1 to 4 as part of a VCStack.
The dot in the lower right corner flashes when the switch
accesses USB memory.