Allied Telesis AT-9900s Switches - Manual (Page 13)

Installation and Safety Guide
13
PSU 2 Green PSU 2 is installed and supplying power to the switch.
The voltage output is within specification.
Red 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.
Off A FOM is installed and operating at an acceptable
speed.
Fault Red The switch or management software is
malfunctioning.
1 Flash One or more heatsink fans has failed or is operating
below the recommended speed.
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.
Rapid
flashing at
startup The SDRAM (DIMM) is not compatible with the
switch.
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.
SD Off Secure Digital memory card. Not supported by 3.0.1
software.
Table 1: System LEDs (Continued)
LED State Description