Appendix F. Troubleshooting and Testing the Adapter
The appendix describes corrective actions for a number of common problems. It
also describes how to test the adapter using the diagnostics.
Problem Symptoms and Corrective Actions
The adapter cannot connect to the network
1. Make sure that the cable is installed correctly.
The network cable must be securely attached at both RJ-45 connections
(adapter and hub). The maximum allowable distance from adapter to the hub is
100 m (328 ft). If the cable is attached and the distance is within acceptable
limits but the problem persists, try a different cable.
If you are directly connecting two computers without a hub or switch, use a
crossover cable.
2. Check the LED lights on the adapter.
The adapter has two diagnostic LEDs, one on each side of the cable connector.
These lights help you to determine whether there is a problem with the
connector, cable, switch, or hub.
LED
Indication
Meaning
ACT/LNK
On
v
The adapter and switch are receiving power.
v
The cable connection between the switch and adapter is
good.
Off
This can be due to one of the following causes:
v
The adapter is not sending or receiving network data.
v
The adapter and switch are not receiving power.
v
The cable connection between the switch and adapter is
faulty.
v
You have a driver configuration problem.
Flashing
The adapter is sending or receiving network data. The
frequency of the flashes varies with the amount of network
traffic.
100
On
The adapter is operating at 100 Mbps.
Off
The adapter is operating at 10 Mbps.
3. Make sure that you are using the correct drivers.
Make sure that you are using the drivers that come with this adapter (for
example, IBMFEODI.DOS). Drivers that support previous versions of this
adapter do not support this version of the adapter.
4. Make sure that the switch port and the adapter have the same duplex
setting.
If you configured the adapter for full duplex, make sure that the switch port is
also configured for full duplex. Setting the wrong duplex mode can degrade
performance, cause data loss, or result in lost connections.
© Copyright IBM Corp. 1998, 1999
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