Troubleshooting The Ethernet Controller; Ethernet Plug Wrap Test; Network Connection Problems - IBM 8676 - Eserver xSeries 335 Hardware Maintenance Manual And Troubleshooting Manual

1. Turn off the server and disconnect all ac power cords.
2. Check for loose cables in the power subsystem. Also check for short circuits, for
3. Remove adapters and disconnect the cables and power connectors to all
4. Reconnect all ac power cords and turn on the server. If the server starts up
To use this method, it is important to know the minimum configuration required for a
system to start (see page 109).

Troubleshooting the Ethernet controller

This section provides troubleshooting information for problems that might occur with
the 10/100/1000 Mbps Ethernet controller.

Ethernet plug wrap test

The way the Ethernet controller is tested depends on which operating system you
are using (see the Ethernet controller device driver README file).
You can use the Ethernet wrap test to determine if a hardware problem is causing
the Ethernet connection to fail. To perform the Ethernet wrap test, use the wrap
plug (FRU 60G3981) with the diagnostic tests.
If this testing method indicates that the hardware is functioning normally but the
problem still exists, see "Network connection problems" or inform the network
administrator.

Network connection problems

If the Ethernet controller cannot connect to the network, check the following
conditions:
v Make sure that the cable is installed correctly.
v Determine whether the hub supports auto-negotiation. If it does not, try
v Check the Ethernet controller LEDs on the rear of the server.
v Make sure that you are using the correct device drivers which are supplied with
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
example, if there is a loose screw causing a short circuit on a circuit board.
internal and external devices until the server is at the minimum configuration
required to start the server (see "Minimum operating requirements" on page
109).
successfully, replace adapters and devices one at a time until the problem is
isolated. If the server does not start up from the minimal configuration, replace
FRUs of minimal configuration one at a time until the problem is isolated.
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 either 100 Mbps or 1000 Mbps,
you must use Category 5 or higher cabling.
configuring the integrated Ethernet controller manually to match the speed and
duplex mode of the hub.
The Ethernet link status LED, on the rear of the server, 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 server.
protocol.
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Chapter 3. Diagnostics