Coastcom D/I Mux III System User Manual page 101

LEDs
Four front panel Light Emitting Diodes (LEDs) indicate status during the CCU/AMCU
initialization process. The control terminal of the D/I Mux III also displays the indicator
status. See Table 3-6 for AMCU LED indications.
LED Action
ACO blinks fast
ACO blinks slowly
ACO blinks rapidly
ACO alternates with
MAJ
MAJ blinks slowly
ACO solid on
BYP solid on
MAJ solid on
MIN solid on
Chapter 3. Installation
Table 3-6. AMCU Front Panel LED Indications
The CCU/AMCU is performing its startup checksum test. For
CCU/AMCU code revision levels of 1.4 or higher, this takes
approximately 25 seconds. (This checksum test is not run in
Feature Group code levels of 8.4/9.4 or higher.)
When the ACO is blinking at a rate of about once per second,
the CCU/AMCU is waiting for special instructions from the
AMCU sub-board.
In code levels of 8.4/9.4 or higher this LED state indicates that
the EPROMs have not been programmed properly.
The CCU/AMCU is erasing FLASH RAM.
The CCU/AMCU is downloading new code from the AMCU sub-
board. The MAJOR LED is ON during the transfer of a section
of code and the ACO LED is ON while FLASH RAM is being
programmed.
The CCU/AMCU is either uploading or downloading memory.
After the memory transfer has completed, the MAJOR LED will
return to its original state.
Alarm Cut-Off has been activated either by the front panel
button, or remotely through the user interface.
The multiplexer is being bypassed.
There is a major alarm.
There is a minor alarm.
Indication
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