Installation Manual 
Quidway S3900 Series Ethernet Switches  Chapter 1  Product Overview
 
Huawei Technologies Proprietary 
1-30 
LED  Mark  Color  Indicates 
ON  A 100 Mbps link is present. 
Green
Flash 
Data is being received/sent on 
the port 
ON  A 10 Mbps link is present. 
Yellow
Flash 
Data is being received/sent on 
the port 
Flashing yellow 
(3 Hz) 
The port fails POST. 
Speed 
OFF  No link is present. 
ON 
The port is operating in full 
duplex mode 
Green
Flash 
Data is being received/sent on 
the port 
ON 
The port is operating in half 
duplex mode 
Yellow
Flash 
Data is being received/sent on 
the port 
Flashing yellow 
(3 Hz) 
The port fails POST. 
Duplex 
OFF 
No data is being received/sent 
on the port 
Solid green  The port is providing power 
Flashing green 
(3 Hz) 
Exceeds the upper limit of 
power consumption on the port 
or the left power is not enough.
Solid yellow 
PoE fault occurs, the port 
cannot provide power normally.
Flashing yellow 
(3 Hz) 
The port fails POST. 
10Base-
T/100Ba
se-TX  
port LED
 
PoE 
OFF 
The port does not provide 
power.