Checking the LEDs
Enterasys B5 Gigabit Ethernet Switch Hardware Installation Guide 3-7
Table 3-7 RJ45 PoE Port LED Definitions
Color State Recommended Action
Off No link. None.
No activity or port in standby.  None.
If the port is one of the highest numbered 
last four RJ45 ports, the port is 
deactivated because the SFP/10G port 
with the same port number is linked.
None.
Green  Solid. Port is linked, but the interface is 
not receiving any traffic. PoE power is 
available.
None.
Blinking. Port is linked and traffic is being 
received or transmitted by the interface. 
PoE power is available.
None.
Amber  Solid. Port is linked, but traffic is not being 
received or transmitted by the interface. 
PoE power has failed. 
PoE power may have been deactivated 
because of excessive power requirement 
or deactivated by configuration.
Power supply failed.
1. Check the attached powered device to 
see if it is defective.
2. Internal power supply failed, contact 
Enterasys Networks for technical 
support.
Blinking. Port is linked and traffic is being 
received or transmitted by the interface. 
PoE power has failed.
PoE power may have been deactivated 
because of excessive power requirement 
or deactivated by configuration.
Power supply failed.
1. Check the attached powered device to 
see if it is defective.
2. Internal power supply failed, contact 
Enterasys Networks for technical 
support.
Table 3-8 SFP/10G Port LED Definitions
Color State Recommended Action
Off No link. None.
No activity or port in standby.  None. 
The port is deactivated because the RJ45 
port with the same port number is linked.
None. 
Green  Solid. Port is linked, but the interface is 
not receiving any traffic.
None. 
Blinking. Port is linked and traffic is being 
received or transmitted by the interface.
None.