Allied Telesis x900 Series Installation Manual - Page 10
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Removable Power Supply and Fan
Table 2: LEDs on the switch reporting PSU status
LED
PSU 1
PSU 2
10
State
Description
Green
PSU 1 is installed and supplying power to the switch. The
voltage output is within specification.
Red
One of the following:
•
PSU 1 is installed in the switch and has exceeded its
recommended temperature threshold of 75º C
(167º F), or the fan has failed.
•
A FOM is installed in the switch and has failed.
•
The bay is empty. Applies to AT-8948, AT-9924T/4SP,
and AT-9924Ts switches since they require a FOM
when only one PSU is installed.
•
PSU 1 is not receiving power when dual PSUs have
been installed.
Off
A FOM is installed and operating at an acceptable speed.
For AT-9924T and x900-48FE switches, a blanking panel
is installed.
Green
PSU 2 is installed and supplying power to the switch. The
voltage output is within specification.
Red
One of the following:
•
PSU 2 is installed in the switch and has exceeded its
recommended temperature threshold of 75º C
(167º F), or the fan has failed.
•
A FOM is installed in the switch and has failed.
•
The bay is empty. Applies to AT-8948, AT-9924T/4SP,
and AT-9924Ts switches since they require a FOM
when only one PSU is installed.
•
PSU 2 is not receiving power when dual PSUs have
been installed.
Off
A FOM is installed and operating at an acceptable speed.
For x900-48FE switches, a blanking panel is installed.