Motorola Starline SG 2000 Installation And Operation Manual page 81

Feature
Transmitter enable
Fault indicator
Description
A green LED that provides visual indication of the transmitter's
enable status.
A single red LED that lights if the hybrid current is outside the
normal operating range, the laser output power is below normal
limits, or the laser current is above normal limits. Because the laser
output requires a short period of time to stabilize, it is acceptable
for the fault indicator to illuminate during the stabilization interval
(approximately 2 seconds). Note that the module must be enabled
for the fault indicator to function.
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