Allied Telesis AT-PWR02 - Manual (Page 15)

Removable Power Supply and Fan
14
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.
The x900-12XT/S and the 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 A FOM is installed and operating at an acceptable
speed. For AT-9924T, x900-48FE, x900-48FS, and
SwitchBlade x908 switches, a blanking plate is installed.