IBM 847651U Handbook - Page 252

Troubleshooting If the Ethernet activity light is off: a. Make sure that the hub and network are operating, and that the correct device drivers are loaded. b. There might be a defective Ethernet connector or cable, or a problem with the hub. 3. Make sure that you are using the correct device drivers that come with your server. 4. Check for operating system-specific causes for the problem. 5. Test the Ethernet controller or adapter. How you test the Ethernet controller or adapter depends on which operating system you are using. Refer to your ServerGuide documentation for details about your operating system. Diagnostic LEDs Your server contains two diagnostic LEDs (one green, and one amber) on the Ethernet connector that is located at the rear of the server. When the green LED is on, it indicates that the Ethernet controller or adapter is connected to a hub or switch and is receiving link pulses. If this LED is not on, check all connections at the controller or adapter and the hub. Make sure that the hub is transmitting at the correct speed, and that the drivers are loaded. Also, make sure that you have the correct wiring configuration for the controller or adapter to the hub connection. Some hubs require a crossover cable rather than a straight-through cable. Notes: 1. This LED is also known as the Link OK light. 2. The green LED is on when you run the diagnostics loopback test without a cable attached to the controller or adapter. When the amber LED is on, it indicates that the Ethernet network is operating at 100 Mbps. When this LED is off, it indicates that the Ethernet network is operating at 10 Mbps. 218 Netfinity 3000 User's Handbook