3-16
Operation
4038501 Rev C
Starting Up the Amplifier with the AGC Module
The following sections describe how to operate amplifiers with the AGC module
mounted. The LEDs on the AGC module indicate the status of the module when it is
mounted.
When the amplifier is powered up, and during initialization of the AGC module and
amplifier, the three LED indicators with different colors flash in sequence for
approximately 50 seconds. The AGC module reads the configurations, such as pilot
settings and AGC function settings, from the amplifier, and runs the configured
function. By default, the AGC module is set to Standby mode when the green LED
indicator is flashing slowly.
Before installing the AGC module, if the values of the output attenuator and
equalizer of the amplifier are less than 4 dB, these values will be set automatically to
4 dB after the AGC module is plugged in. On the other hand, if such values are not
less than 4 dB, they will be kept. These values are shown on the handheld display or
in the ROSA Element Management system.
Description of LED Indications
The following table lists LED status and description.
LED Status
Description
Red
Warning: out of AGC range
Red, fast flashing
Warning: auto alignment is out of range
Red, slow flashing
Warning: auto alignment is timed out
Green
The AGC module is in AGC mode
Green, fast flashing
Auto alignment is in progress
Green, slow flashing
The AGC module is in Standby mode
Yellow
The AGC module is in Fixed Gain mode
Yellow, fast flashing
Level out of range is detected
Yellow, slow flashing
NA
All of the three LED
indicators are on
Communication with the amplifier failed
Note:
To avoid the warnings of auto alignment being overlooked, the failure status
of auto alignment is not cleared unless the user manually changes the AGC module
to other functions or runs another auto alignment.
