Specifications

Hardware Reference 23
C613-03084-00 REV A
LEDs and What They Mean
How the LEDs on AT-9900 Series switches report faults and operational
activities are described are described in Table 1-9 on page 23, Table 1-10 on
page 24, and Table 1-11 on page 24.
How the LEDs on power supply units (AT-PWR01) and fan only modules
(AT-FAN01) report faults and operational activities are described in Table 1-12
on page 25.
System LEDs
Table 1-9: System LEDs on all AT-9900 Series switches
LED State Function
PSU 1 Green PSU 1 is installed and supplying power to the
switch, and the voltage output is within
specification.
Red PSU 1 is installed in the switch and either a fan
has failed, or the PSU has exceeded its
recommend temperature threshold of 75º C
(167º F).
A FOM is installed in the switch and a fan has
failed.
The bay is empty.
Not lit A FOM is installed and the fan is good.
PSU 2 Green PSU 2 is installed and supplying power to the
switch, and the voltage output is within
specification.
Red PSU 2 is installed in the switch and either a fan
has failed, or the PSU has exceeded its
recommend temperature threshold of 75º C
(167º F).
A FOM is installed in the switch and a fan has
failed.
The bay is empty.
Not lit A FOM is installed and the fan is good.