Chapter 3: Subsystem Monitoring
Status-indicating LEDs
3-9
Color
Status
FLASHING
Green
The power supply has not been turned on. The PSU
module LED will blink when the subsystem is
connected to a power source but not yet turned on.
Static Green
The PSU is operating normally and experiencing no
problem.
Static Red
The PSU has failed and is unable to provide power to
the subsystem.
OFF
The subsystem has not yet been plugged into a power
source.
Table 3-8: PSU LED Definitions
3.2.8
Cooling Module LEDs
Each cooling module has two (2) red LEDs on the back. Each LED
corresponds to a single fan in the cooling module. (See
Figure 3-7
) When
the LED is on, it indicates the fan has failed. When the LED is off, it
indicates the fan is functioning properly.
Figure 3-7: Cooling Module LEDs and Cooling Fan Locations
The AR3016G has a novel approach to stabilizing the temperature within
the subsystem: When the intelligent sensors on the backplane detect higher
temperature, such as high ambient temperature or the failure of any cooling
or PSU module, the system will turn the cooling fans to high speed to
extract more heat. Once the ambient temperature cools down to normal or
the cooling or PSU modules have been replaced, the cooling fans will return
to low speed.
