Figure 8: Switch Id Led Not In Low Power Mode; Figure 9: Switch Id Leds In Low Power Mode - Allied Telesis AT-XS916MXT Installation Manual

Chapter 1: Overview
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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 dot in the lower right corner flashes when the switch
accesses USB memory.
Figure 8. Switch ID LED Not in Low Power Mode
The switch displays the letter "F" for fault on the ID LED if it encounters
one of the following problems:
A cooling fan has failed.

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 9.
The switch is the master switch of a VCStack.
The switch is operating as a stand-alone unit.
The switch is a member switch of a VCStack.
Figure 9. Switch ID LEDs in Low Power Mode
The switch has an ID number of 1 or 2 as part of a VCStack.