Status signalling with LEDs and status messages
99-145912-A Chapter 8: Service & maintenance 8-13
8.4.4 LEDs of the GMU
The GMU does not have any LEDs on the front plate. You can check the
status of the GMU in the display of the ACU, in the menu Modem. The
current status is communicated by a text string. Each LED can have the
status steady green, red or amber, or flashing green, red or amber.
•NET LED
•STAT LED
•TX LED
•RX1 LED
•RX2 LED
•PWR LED
•TEMP LED
•FAN LED
Fail/Pass
LED
Steady red A fault which prevents operation is present
in the system (ACU, ADU, MODEM).
Flashing
green
A Power On Self Test (POST) or Person
Activated Self Test (PAST) in progress. The
current status is displayed.
Flashing red Active BITE failure or warning. The event is
shown in the ACU display.
Steady green No faults.
LED Behaviour Description
Table 8-2: LEDs on the ACU (Continued)