Allied Telesis Removable Power Supply and Fan - Manual (Page 21)

Removable Power Supply and Fan
20
Switch The following table describes how LEDs on the switch report operations and
faults with installed PSUs and FOMs.
LED State Description
PSU 1
and
PSU 2 Green The PSU is installed and supplying power to the switch.
The voltage output is within specification.
Red One of the following:
• The PSU is installed in the switch, and a fan has
failed or the PSU has exceeded its recommended
temperature threshold of 70ºC (158º F).
• A FOM is installed in the switch and a fan has failed.
Note that the x900-12XT/S and SwitchBlade x908
switches do not support FOMs.
• The bay is empty. Applies to AT-8948, AT-9924Ts,
x900-24XT, x900-24XT-N, and x900-24XS
switches which require a FOM when only one PSU
is installed.
• Dual PSUs are installed, but the PSU is not
receiving power.
Off One of the following:
• A FOM is installed and operating at an acceptable
speed. Applies to AT-9924T, x900-48FE, and
x900-48FS.
• On SwitchBlade x908 switches there is no power
supply in this bay.