The method that you use to test the Ethernet controller depends on the operating system you are using. Refer to the operating-system documentation for information about Ethernet controller. Also refer to the Ethernet controller device-driver readme file.

Check out the following:

• Make sure that the correct device drivers, which come with the HMC are installed and at the latest level.
• Make sure that the Ethernet cable is installed correctly.
  • The 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 HMCs (without a hub), or if you are not using a hub with X ports, use a crossover cable. 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.
• Determine whether the hub supports auto-negotiation. If it does not, try configuring the integrated Ethernet controller manually to match the speed and duplex mode of the hub.

• Check the Ethernet controller LEDs on the rear panel of the 7042-CR4 HMC or 7042-C06 HMC. These LEDs indicate whether there is a problem with the connector, cable, or hub.
• The Ethernet link status LED (or Ethernet speed LED) is lit when the Ethernet controller receives a link pulse from the hub. If the LED is off, there might be a defective connector or cable or a problem with the hub.
• The Ethernet transmit/receive activity LED is lit 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 operaitng and that the correct device drivers are installed.
• Check the LAN activity LED on the rear of the HMC. The LAN activity LED is lit when data is active on the Ethernet network. If the LAN activity LED is off, make sure that the hub and network are operating and that the correct device drivers are installed.