IBM 887022X Maintenance Manual - Page 87

If the problem still exists after checking the operating system documentation, try the following: v 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 remains, try a different cable. If you set the Ethernet controller to operate at 100 Mbps, you must use Category 5 cabling. If you directly connect two workstations (without a hub), or if you are not using a hub with X ports, use 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. v Determine if the hub supports auto-negotiation. If not, try configuring the integrated Ethernet controller manually to match the speed and duplex mode of the hub. v Check the Ethernet controller lights on the server rear panel. These lights indicate whether a problem exists with the connector, cable, or hub. - The Ethernet Link Status light illuminates when the Ethernet controller receives a LINK pulse from the hub. If the light is off, there might be a defective connector or cable, or a problem with the hub. - The Ethernet Transmit/Receive Activity light illuminates when the Ethernet controller sends or receives data over the Ethernet Network. If the Ethernet Transmit/Receive Activity light is off, make sure that the hub and network are operating and that the correct device drivers are loaded. v Check the LAN activity light (if available) on the rear of the server. The LAN activity light is illuminated when data is active on the Ethernet network. If the LAN activity light is off, make sure that the hub and network are operating and that the correct device drivers are loaded. v Make sure that you are using the correct device drivers, which are supplied with the server. v Check for operating-system-specific causes for the problem. v Make sure that the device drivers on the client and server are using the same protocol. If the Ethernet controller still cannot connect to the network, inform the network administrator. Chapter 3. Diagnostics 77