Installation guide

Diagnostics and Utilities 9-17
Check the Ethernet adapter’s self-test results. The show configuration
printout is the most convenient display of the results. A "+" indicates the
adapter passed self-test.
Independent of the module’s internal self-test is an external loopback test.
The loopback test runs independently at power-up and its results are not
included in the self-test. That is, a DEMNA could pass self-test but fail the
external loopback test. The results of the external loopback testing are re-
ported by the External Loopback LED on the module. It is a green LED be-
low the yellow Self-Test OK LED.
Open the front cabinet door. Noting the adapter’s card cage position from
the show configuration printout, locate the module in the appropriate
card cage and slot.
If the External Loopback LED is not lit, the module may have passed self-
test, but may not be able to send or receive commands.
For more information:
DEC LANcontroller 400 Installation Guide