3Com SuperStack 3 Switch 3300 XM User Manual page 15

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Table 3 LED behavior
LED Color
Port Status LEDs
Packet Yellow
Off
Status Green
Green flashing
Off
Unit LEDs
1–8 Green
Off
Power/Self Test LED
Green
Green flashing
Yellow
Off
Switch — Front View Detail
Indicates
Packets are being transmitted/received on the port.
No packets are being transmitted/received on the
port.
A link is present, and the port is enabled.
A link is present, but the port is disabled.
No link is present.
The Switch forms a stack with other Switch units;
the LED indicates the position of the Switch in the
stack and that a link is present. Note that although
there are eight LEDs, only four Switch units can be
stacked at present.
The Switch is stand-alone.
The Switch is powered-up.
The Switch is either downloading software or is
initializing (which includes running a Power On Self
Test).
The Switch has failed its Power On Self Test.
The Switch is not receiving power.
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