3Com SuperStack 3 Switch 4300 Getting Started Manual page 15

Table 5 LED behavior
LED Color
Port Status LEDs
Packet Green
Off
Status Green
Green flashing
Yellow
Yellow flashing
Off
Module Packet LEDs (P)
Green
Off
Module Status LEDs (S)
Green
Off
Power LED (PWR)
Green
Off
POST LED (Post)
Yellow flashing
Yellow
Off
Switch 4300 — Front View Detail
Indicates
Packets are being transmitted/received on the port.
No packets are being transmitted/received on the port.
A high speed (100 Mbps) link is present, and the port is
enabled.
A high speed (100 Mbps) link is present, but the port is
disabled.
A low speed (10 Mbps) link is present, and the port is
enabled.
A low speed (10 Mbps) link is present, but the port is
disabled.
No link is present.
Packets are being received or transmitted.
No activity
The Module is installed and supported.
The Module is either not installed or not supported.
The Switch is powered-up and operating normally.
The Switch is not receiving power or there is a fault with
the Power Supply Unit.
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 has completed either a software download or
the Power On Self Test.
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