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4 - 2 ONline Ethernet 10BASE-FL Installation and Operation Guide
Troubleshooting Using the Port Activity LEDs
If a port Activity LED does not light, use the Table 4-1 to help troubleshoot
the problem.
Table 4-1. Troubleshooting Using the Port Activity LEDs
LED Name
LED
State
Possible Cause Corrective Action
Activity
(Ports)
1 - 4)
Off There is no traffic
received from the
segment.
None.
Port is disabled. Enable the port.
Power is off. Check the Controller
Module Power LED.
Activity LED has burnt
out.
Press the LED check
button on the
Controller Module.
10BASE-FL Module
port is faulty.
Connect the cable
to a different port.
10BASE-FL Module is
faulty.
Try a different
10BASE-FL Module.
Backplane connection
is bad.
Reinsert the
10BASE-FL Module. If
this fails, try another
concentrator slot.