Appendix F Status Checks with LEDs
F.1. LED Type
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(*1) If Alarm LED is turning on orange, the FANM with the particular LED fails. Even though Alarm LED
remains off, SEL may be displayed which indicates the FANM error due to detecting not enough fan
rotation by preventive fan monitoring function.
(*2) There is a CSS LED on an OPL, not a PSU.
F.1.3 FANU
The FANU comes equipped with the following LED.
TABLE F.4 FAN LED
Indicates state of FANM#0.
Indicates power state of PSU supplying power to FANU.
Indicates state of FANM#1
TABLE F.5 Power status and FANU LED display
AC input is on, and the PSU is off.
AC input is on, and the PSU is on.
FANU temperature error is predicted.
FANU temperature error is detected or
the power system error in a PSU is
The power system of a FANU failed.
(*1) If Alarm LED is turning on orange, the FANM with the particular LED fails. Even though Alarm LED
remains off, SEL may be displayed which indicates the FANM error due to detecting not enough fan
rotation by preventive fan monitoring function.
(*2) There is a CSS LED on an OPL, not a PSU.
F.1.4 SB
SB comes equipped with the following LED.
TABLE F.6 SB LED
Indicates power state in a SB.
Indicates whether there is error or not in a SB.
- Can be arbitrarily set to blink or turned off by the user.
- Indicates the component undergoing maintenance when
Maintenance Wizard is running.
TABLE F.7 SB status and SB LED display
AC off and partition power Off
Partition including SB Power On
Identifying SB
(Turn on by Maintenance Wizard)
F.1.5 IOU
IOU which is IOU_1GbE or IOU_10GbE comes equipped with the following LED.
