Table 4-2. Troubleshooting Using the Port Status LEDs (Continued)

LED State

Indication

Possible Cause

Corrective Action

 

 

 

 

 

 

 

1 Blink

No Light

Cables crossed.

Verify TX on remote

 

 

Received

 

 

device is connected to

 

 

 

 

 

 

RX on 10BASE-FB

 

 

 

 

 

 

Module.

 

 

 

 

 

 

 

 

 

 

 

Insufficient

Check 10BASE-FB

 

 

 

 

optical power

Module optical power

 

 

 

 

received.

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

Check and fix RX fiber

 

 

 

 

cable.

link.

 

 

 

 

 

 

 

 

 

 

Bad fiber

Clean and reconnect

 

 

 

 

connections.

fiber (both ends).

 

 

 

 

 

 

 

 

 

 

Bad remote

Replace remote device

 

 

 

 

device or port.

or try another port.

 

 

 

 

 

 

 

 

 

 

Bad 10BASE-FB

Replace module.

 

 

 

 

Module.

 

 

 

 

 

 

 

 

4 - 4 ONline Ethernet 10BASE-FB Module Installation and Operation Guide

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3Com 5104M-FB1, 5102M-FBP, 510M-FBP installation and operation guide Troubleshooting Using the Port Status LEDs