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2-18 Issue 2 November 1996
LED Indications
Two LEDs are located on the top of the 8400B Plus Data Module. One LED is
red, and the other LED is green. These indicate the status of the set during
normal operation, and the result of self-tests when the unit is initially powered.
When power is first applied to the 8400B Plus Data Module, the unit performs a
self-test to verify that it is in working order. During the self-test, both LEDs will
remain lit. When the self-test is complete, the green LED will turn off.
■ If self-test passed, the red LED will remain on. This indicates that your
8400B Plus Data Module is installed and READY for data
communications operation.
■ If self-test failed, the red LED will flash three times, and then remain on.
This indicates a defective unit. Call the Lucent Technologies Technical
Service Center at 1 800 242-2121.
Table 2-2 lists all possible LED indications. Also refer to Chapter 4 for
troubleshooting guidelines.