1-8
Table 1-7 10/100/1000Base-T auto-sensing Ethernet port LEDs description
Switch model Ethernet port status LED Meaning
Solid green The port operates at a rate of 1000 Mbps
Fast blinking
Data is being transmitted or received at 1000
Mbps.
Green
Off
The port is not up or does not operate at 1000
Mbps
Solid yellow The port operates at a rate of 10/100 Mbps
Fast blinking
Data is being transmitted or received at
10/100 Mbps
Blinking (3 Hz) The POST has failed
S5120-20P-SI
S5120-28P-SI
Yellow
Off
The port is not up or does not operate at
10/100 Mbps
Solid green The port operates at a rate of 1000 Mbps
Fast blinking green
Data is transmitted or received at a rate of
1000 Mbps
Solid yellow The port operates at a rate of 10/100 Mbps
Fast blinking yellow
Data is transmitted or received at a rate of
10/100 Mbps
S5120-52P-SI
Off The port is not up or the POST has failed
1000Base-X SFP interface status LED
Table 1-8 1000Base-X SFP interface status LEDs description
SFP interface status LED Meaning
Solid green
The port operates at a rate of 1000 Mbps
The port is transmitting data at 1000 Mbps
Blinking green The LED is fast flashing when data is being received on the port.
Off No link is present on the port
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