4 - 4 ONline Ethernet 10BASE-FB Module Installation and Operation Guide
1 Blink No Light
Received Cables crossed. Verify TX on remote
device is connected to
RX on 10BASE-FB
Module.
Insufficient
optical power
received.
Check 10BASE-FB
Module optical power
using a light meter.
Try High power on
remote device.
Check optical power of
remote device.
If optical power levels
are OK, check cable; it
may be bad or too
long.
Broken fiber
cable. Check and fix RX fiber
link.
Bad fiber
connections. Clean and reconnect
fiber (both ends).
Bad remote
device or port. Re place remote device
or try another port.
Bad 10BASE-FB
Module. Replace modu le.
Table 4-2. Troubleshooting Us ing the Port Status LEDs (Continu ed)
LED State Indication Possible Cause Corrective A ction