IBM xSeries 342 2RX Maintenance Manual

Contents

Troubleshooting the Ethernet controllerThis section provides troubleshooting information for problems that might occurwith the 10/100 Mbps Ethernet controller.Network connection problemsIf the Ethernet controller cannot connect to the network, check the following:v Make sure that the cable is installed correctly.The network cable must be securely attached at all connections. If the cable isattached but the problem persists, try a different cable.If you set the Ethernet controller to operate at 100 Mbps, you must use Category5 cabling.If you directly connect two workstations (without a hub), or if you are not usinga hub with X ports, use a crossover cable.Note: To determine whether a hub has an X port, check the port label. If thelabel contains an X, the hub has an X port.v Determine if the hub supports auto-negotiation. If not, try configuring theintegrated Ethernet controller manually to match the speed and duplex mode ofthe hub.v Check the Ethernet controller lights on the operator information panel.These lights indicate whether a problem exists with the connector, cable, or hub.– The Ethernet Link Status light illuminates when the Ethernet controllerreceives a LINK pulse from the hub. If the light is off, there might be a badconnector or cable, or a problem with the hub.– The Ethernet Transmit/Receive Activity light illuminates when the Ethernetcontroller sends or receives data over the Ethernet Network. If the EthernetTransmit/Receive Activity light is off, make sure that the hub and networkare operating and that the correct device drivers are loaded.– The Ethernet Speed 100 Mbps light illuminates when the Ethernet controllerLAN speed is 100 Mbps.v Make sure that you are using the correct device drivers, supplied with yourserver.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 sameprotocol.v Test the Ethernet controller.How you test the Ethernet controller depends on which operating system youare using (see the Ethernet controller device driver README file).Ethernet controller troubleshooting chartYou can use the following troubleshooting chart to find solutions to 10/100 MbpsEthernet controller problems that have definite symptoms.Diagnostics 17