IBM Netfinity 4500R Type 8656 Hardware Maintenance Manual page 26

Table 1. Ethernet troubleshooting chart.
Ethernet controller problem
The server stops running
when loading device drivers.
Ethernet Link Status light
does not light.
The Ethernet
Transmit/Receive Activity
light does not light.
Data is incorrect or sporadic.
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Hardware Maintenance Manual: Netfinity 4500R Type 8656
The PCI BIOS interrupt settings are incorrect.
Check the following:
• Determine if the interrupt (IRQ) setting assigned to the Ethernet controller is also
assigned to another device in the Configuration/Setup Utility program.
Although interrupt sharing is allowed for PCI devices, some devices do not
function well when they share an interrupt with a dissimilar PCI device. Try
changing the IRQ assigned to the Ethernet controller or the other device. For
example, for NetWare Versions 3 and 4 it is recommended that disk controllers not
share interrupts with LAN controllers.
• Make sure that you are using the most recent device driver available from the
World Wide Web.
• Run the network diagnostic program.
If the problem remains, go to "Starting the diagnostic programs" on page 14 to run the
diagnostic programs.
Check the following:
• Make sure that the hub is turned on.
• Check all connections at the Ethernet controller and the hub.
• Check the cable. A crossover cable is required unless the hub has an X designation.
• Use another port on the hub.
• If the hub does not support auto-negotiation, manually configure the Ethernet
controller to match the hub.
• If you manually configured the duplex mode, make sure that you also manually
configure the speed.
• Run diagnostics on the LEDs.
If the problem remains, go to "Starting the diagnostic programs" on page 14 to run the
diagnostic programs. .
Check the following:
Note: The Ethernet Transmit/Receive Activity LED illuminates only when data is
sent to or by this Ethernet controller.
• Make sure that you have loaded the network device drivers.
• The network might be idle. Try sending data from this workstation.
• Run diagnostics on the LEDs.
• The function of this LED can be changed by device driver load parameters. If
necessary, remove any LED parameter settings when you load the device drivers.
Check the following:
• Make sure that you are using Category 5 cabling when operating the server at 100
Mbps.
• Make sure that the cables do not run close to noise-inducing sources like
fluorescent lights.
Suggested Action