Figure 11: Switch Id Led With The Eco-Friendly Mode Disabled; Figure 12: Switch Id Led With The Eco-Friendly Mode Enabled - Allied Telesis x950 Series Installation Manual

The switch is booting up.
The switch has encountered a fault condition.
The VCStack feature is disabled. The switch is operating
as a stand-alone unit, with the ID number 1.
The switch is a member of a VCStack and has
an ID number in the range of 1 to 8.
The dot in the lower right corner flashes when the switch
accesses USB memory.
Figure 11. Switch ID LED with the eco-friendly Mode Disabled
The switch displays the letter "F" for fault on the ID LED if it detects one of
the following problems:
A cooling fan has failed.

The switch is about to shut down because its internal temperature

is outside the normal operating range.
Note
You can use the SHOW SYSTEM ENVIRONMENT command in the
command line interface to identify the source of the problem.
Figure 12 illustrates the states of the LED when the eco-friendly mode is
enabled and the switch is operating in the low power mode.
The VCStack feature is disabled. The switch is operating
as a stand-alone device.
The switch is the master switch of a VCStack.
The switch is a member switch of a VCStack.
Figure 12. Switch ID LED with the eco-friendly Mode Enabled
x950 Series Installation Guide for VCStack
37