Specifications

Hardware Reference 13
C613-03092-00 REV D
System LEDs
LED State Description
PSU 1 Green PSU 1 is installed and supplying power to the switch. The voltage
output is within specification. PSU 1 is in the right bay when facing
the rear of the switch.
Red One of the following:
• PSU 1 is installed in the switch, and either a fan has failed or the
PSU has exceeded its recommended temperature threshold of
75º C (167º F).
• A FOM is installed in the switch and a fan 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.
Off A FOM is installed and operating at an acceptable speed.
For AT-9924T and x900-48FE switches, a blanking panel is installed.
PSU 2 Green PSU 2 is installed and supplying power to the switch. The voltage
output is within specification. PSU 2 is in the left bay when facing
the rear of the switch.
Red One of the following:
• PSU 2 is installed in the switch, and either a fan has failed or the
PSU has exceeded its recommended temperature threshold of
75º C (167º F).
• A FOM is installed in the switch and a fan 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.
Off A FOM is installed and operating at an acceptable speed.
For x900-48FE switches, a blanking panel is installed.
Fault Red The switch or management software is malfunctioning. This LED
lights and then turns off after hardware initialises.
1 Flash One or more heatsink fans has failed or is operating below the
recommended speed.
3 Flashes For AT-9900, AT-9924Ts, and x900-24X switches, the ability to
monitor temperature and fans has failed, and it cannot report
whether they are in the supported ranges. After flashing three
times, the LED stops briefly, then repeats the sequence.
6 Flashes The switch’s temperature has exceeded the recommended
threshold. After flashing six times, the LED stops briefly, then
repeats the sequence.
Slow
flashing at
startup
The SDRAM (DIMM) has not been detected. Not applicable to
AT-9924Ts or x900-24X switches.
Rapid
flashing at
startup
The SDRAM (DIMM) is not compatible with the switch. Not
applicable to AT-9924Ts or x900-24X switches.
CF Green
flashing
The CompactFlash memory card is active and should not be ejected.
The card can be safely ejected when the LED remains off. Valid for
AT-8948, x900-48FE, and AT-9900 switches.
SD Green
flashing
The Secure Digital memory card is active and should not be ejected.
The card can be safely ejected when the LED remains off. Valid for
AT-9924Ts and x900-24X switches.