Figure 6: Switch Id Led; Figure 7: Switch Id Led - Allied Telesis AT-x510-28GTX Installation Manual

Chapter 1: Overview
30
The states of the LED when the switch is not operating in the low power
mode are shown in Figure 7.
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.
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.

One of the power supplies has failed.
 The internal temperature of the switch has exceeded the normal
operating range and the switch may shut down.
Figure 6. Switch ID LED
Figure 7. Switch ID LED
Switch
ID LED