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4 - 4 ONline Ethernet 10BASE-FL Installation and Operation Guide
1 Blink
(continued)
No Light
Received
Insufficient
optical power
received.
Check 10BASE-FL
Module optical power
using a light meter.
Check optical power
of remote device.
If optical power levels
are OK, check cable; it
may be bad or too
long.
Bad remote
device.
Replace remote device.
Bad 10BASE-FL
Module.
Replace module.
2 Blinks Port
Partitioned
Bad fiber
connections.
Clean and reconnect
fiber (both ends).
Bad remote
device.
Replace remote device.
Broken fiber. Check and fix RX fiber
link.
Bad 10BASE-FL
Module.
Replace Module.
3 Blinks FIFO error or
MAU jabber
lockup
protection
Check optical
power.
Verify that optical
power level is correct.
Bad fiber
connections.
Clean and reconnect
TX fiber (both ends).
Broken or
cracked fiber.
Check and fix RX fiber
link.
Table 4-2. Troubleshooting Using the Port Status LEDs
LED State Indication Possible Cause Corrective Action