Hardware Reference
17
C613-03092-00 REV J
System LEDs
The following LEDs report operations and faults on the switch.
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.
•
A FOM is installed in the switch and a fan has failed. Note that
the SwitchBlade x908 switch does not support FOMs.
•
The bay is empty. Applies to AT-8948, AT-9924Ts, x900-24XT,
x900-24XT-N, and x900-24XS switches since they require a
FOM when only one PSU is installed.
•
Dual PSUs are installed, but the PSU is not receiving power.
•
The standby switch has been turned off.
Off
A FOM is installed and operating at an acceptable speed.
For the AT-9924T, x900-48FE, x900-48FS, and SwitchBlade x908
switches, a blanking plate is installed.
POWER Green
The PSU is operating and supplying power to the switch. The
voltage output is within specification. Valid for the x900-12XT/S.
Fault
Red
The switch or management software is malfunctioning. This LED
lights and then turns off after hardware initialises.
Red
flashing
The following flash sequences indicate a hardware-related fault.
After sequences of two or more flashes, the LED stops briefly, then
repeats the sequence. If multiple faults occur, the LED flashes each
sequence in turn, stops briefly, then repeats the sequences.
1 Flash
One or more heatsink fans has failed or is operating below the
recommended speed.
2 Flashes
For SwitchBlade x908 switches, one or both of the chassis fans are
not installed, or the fans are operating below the recommended
speed.
3 Flashes
For switches running the AlliedWare operating system only, models
AT-9924T, AT-9924SP, AT-9924Ts, x900-24XT, x900-24XT-N, and
x900-24XS, the ability to monitor temperature and fans has failed,
and it cannot report whether they are in the supported ranges.
4 Flashes
For switches running the AlliedWare Plus operating system, an XEM
failed to initialise or is incompatible.
6 Flashes
The switch’s temperature has exceeded the recommended
threshold.
Slow
flashing at
startup
The SDRAM (DIMM) has not been detected. Does not apply to
AT-9924Ts, x900-12XT/S, x900-24XT, x900-24XT-N, x900-24XS,
and SwitchBlade x908 switches.
Rapid
flashing at
startup
The SDRAM (DIMM) is not compatible with the switch. Does not
apply to AT-9924Ts, x900-12XT/S, x900-24XT, x900-24XT-N,
x900-24XS, or SwitchBlade x908 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, x900-48FS, AT-9924T, and AT-9924SP
switches.
