3Com 3C94024 - CoreBuilder 9400 1000SX Switch Getting Started Manual page 39

Table 9 Troubleshooting Abnormal Port LED Activity
LED Status Possible Sources of the Problem
Pckt LED does not light. System is not processing any packets.
Stat LED does not light. System does not recognize a connection
to the port.
Cable problem.
No data being transmitted or
received.
Port is disabled
Port is off-line.
Cable is not fully attached to the port.
Port cable is faulty.
Device attached to port is not
powered on.
Fiber optic ports or connectors are
dirty.
If a GBIC port is affected, the
transceiver may not be properly
seated or is defective.
Steps to Take
Check the Administration Console display.
1 Verify that all cables are firmly plugged into both the system's affected
port and the attached device.
2 If a GBIC port is affected, verify that the transceiver is properly seated.
Re-seat the GBIC. If the transceiver is properly seated, try another
transceiver.
3 Test for faulty cables.
4 Clean the fiber optic ports and connectors. See next section.
When the problem is corrected, the LED lights green.
If the LED still does not light, contact your network supplier or 3Com
Technical Support.
Diagnosing Problems 39