IBM 847651U Handbook - Page 251

Troubleshooting Troubleshooting the 10/100 Mbps Ethernet controller This section provides troubleshooting information for problems that might occur with the 10/100 Mbps Ethernet controller. Note: For additional information about the Ethernet controller, such as configuration and auto-negotiation, see "Configuring the Ethernet controller" on page 59. For an illustration of the Ethernet activity light location on the server, see "Status indicators" on page 10. Network connection problems If the Ethernet controller cannot connect to the network, check the following: 1. Make sure that the cable is installed correctly. The network cable must be securely attached at all connections. If the cable is attached but the problem persists, try a different cable. If you use the integrated Ethernet controller, you must use Category 5 cabling. See Appendix A, "Ethernet cable specifications" on page 271 for additional information about Ethernet cable requirements. If you directly connect two workstations (without a hub), or if you are not using a hub with X ports, use a crossover cable. See Appendix A, "Ethernet cable specifications" on page 271 for an illustration of a crossover cable. Note: To determine whether a hub has an X port, check the port label. If the label contains an X, the hub has an X port. 2. Check the Ethernet activity light on the front of the server. The Ethernet activity light comes on when the Ethernet controller sends or receives data over the Ethernet network. Note: This light is off when you run the diagnostic programs in the Configuration/Setup Utility program. Chapter 5. Solving problems 217