Installation manual

Table Of Contents
Installing the Data Module, Hardware Key, and Remote Maintenance Line
3-16 Installing the Data Module
If the self-test failed, the red LED will flash three times and then remain lit.
See the 8400B Plus Data Module User Guide to resolve configuration
problems.
Note
If the red and green LEDs flash alternately, the data module
cannot communicate with the switch. In this case,
Check the connections and wiring.
Check the data module optioning.
Test the data module from the DEFINITY system
using the Status Data switch command. You must
enter the data module extension number.