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The display can be used for troubleshooting the ADSL connection. The dots in the display indicate:
. (one dot)
Power on, idle - no DSLAM has been detected.
.. (two dots)
Power on, idle - DSLAM has been detected and ADSL training has been attempted to it.
… (three dots)
DSLAM located and connection has been establised
To troubleshot the ADSL connection:
The dots remain in the display until the unit is restarted. If there are two dots in the display you know that the modem has been in contact with a DSLAM since you turned the unit on.