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Troubleshooting 4 - 3
Troubleshooting Using the Port Status LEDs
A blinking Port Status indicator is always a sign that the port detects a
potential problem. Once a port detects a problem, you can further analyze
the problem by counting the number of blinks. Table 4-2 provides
troubleshooting suggestions for each blinking sequence.
Table 4-2. Troubleshooting Using the Port Status LEDs
LED State Indication Possible Cause Corrective Action
Off Port
Disabled
Port disabled. Enable port.
10BASE-FL
Module not
powered.
Check concentrator
power status.
Reinsert 10BASE-FL
Module.
Broken LED. Press LED check
button on Controller
Module.
Bad 10BASE-FL
Module.
Replace Module.
1 Blink No Light
Received
Cables crossed. Verify TX on remote
device is connected to
RX on 10BASE-FL
Module.
Broken fiber
cable.
Check and fix RX fiber
link.
Bad fiber
connections.
Clean and reconnect
fiber (both ends).