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TROUBLE.TXT
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1993-03-04
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3Com Corporation
EtherDisk Diskette for the EtherLink II Adapters
Troubleshooting
If the EtherLink II adapter diagnostic tests fail, the adapter may not be
defective. Check the following:
1. Make sure the adapter is completely seated in its slot. Review the
installation instructions in the appropriate adapter guide.
2. Inspect all cables and connections.
3. If you are running the Group 2 tests, make sure that the adapter is
securely connected to a loopback plug (coax version only) or to a
properly cabled inactive network.
4. If you are running the Group 3 tests, make sure that the adapter is
securely connected to a properly cabled inactive network and that an
echo server is set up on the network.
5. Make sure that the jumper settings do not conflict with the settings of
any other peripheral or software program installed in the computer.
Jumper settings to check are the I/O Base Address, Interrupt Level, DMA
channel, and Memory Base Address. For a list of system resources
commonly used by other peripherals, select "Additional Adapter
Information" from the main menu, then "System Resources" from the
submenu.
6. Make sure that the transceiver type is correct.
7. Running tests while connected to an active network can cause intermittent
failures. These failures can be avoided by using an inactive network on
which only the computer being tested (and an echo server if running the
Group 3 tests) is connected.
8. If you installed an EtherLink II TP adapter, check the LEDs on the back-
plate of the adapter. The yellow (ACT) LED is on when there is data
transmission activity on the adapter. This light will go on during
the Group 2 and Group 3 tests. The green (LNK) LED will be on when there
is a correct connection between the adapter and the hub. If the link
pulse jumper is in the OFF position, the green LED will be on whether or
not there is a connection.
9. If you installed an EtherLink II TP adapter, make sure that the settings
for the following jumpers are correctly configured for the hub:
RECEIVE THRESHOLD
DC SIGNAL
LINK PULSE
EQUALIZATION
WIRE IMPEDANCE
TRANSMIT LEVEL
For information on setting these jumpers, select "Additional Adapter
Information" from the main menu, then "Twisted-pair Options" from the
submenu.
10. The slot in the computer may be defective. Install the adapter in
another slot and run the tests again.
11. The computer in which the adapter is installed may be defective.
Install the adapter in a known functioning computer and run the tests
again.
12. The loopback plug you are using may be defective. Try a different
loopback plug.
13. Replace the failed adapter with a known working EtherLink II adapter,
with the same jumper settings. If the second EtherLink II adapter fails,
something is wrong with the test environment, not with the adapter.
(%VER Troubleshooting v3.4a)