CHAPTER15 Media
Mediant 1000 Gateway & E-SBC | User's Manual
Automatic Gain Control (AGC)
Automatic Gain Control (AGC) adjusts the energy of the output signal to a required level (volume).
This feature compensates for near-far gain differences. AGC estimates the energy of the incoming
signal from the IP or Tel side, determined by the 'AGC Redirection' parameter, calculates the
essential gain, and then performs amplification. Feedback ensures that the output signal is not
clipped. You can configure the required Gain Slope in decibels per second using the 'AGC Slope'
parameter and the required signal energy threshold using the 'AGC Target Energy' parameter.
When the AGC first detects an incoming signal, it begins operating in Fast Mode, which allows the
AGC to adapt quickly when a conversation starts. This means that the Gain Slope is 8 dB/sec for
the first 1.5 seconds. After this period, the Gain Slope is changed to the user-defined value. You
can disable or enable the AGC's Fast Mode feature, using the 'AGC Disable Fast Adaptation'
parameter. After Fast Mode is used, the signal should be off for two minutes in order to have the
feature turned on again.
This feature is applicable only to digital interfaces.
➢ To configure AGC:
1. Open the DSP Settings page (Setup menu > Signaling & Media tab > Media folder > DSP
Settings).
2. From the 'IPMedia Detectors' drop-down list [EnableDSPIPMDetectors], select Enable.
3. Configure the following AGC parameters:
● 'Enable AGC' [EnableAGC] - Enables the AGC mechanism.
● 'AGC Slope' [AGCGainSlope] - Determines the AGC convergence rate.
● 'AGC Redirection' [AGCRedirection] - Determines the AGC direction.
● 'AGC Target Energy' - Defines the signal energy value (dBm) that the AGC attempts to
attain.
● 'AGC Minimum Gain' [AGCMinGain] - Defines the minimum gain (in dB) by the AGC when
activated.
● 'AGC Maximum Gain' [AGCMaxGain] - Defines the maximum gain (in dB) by the AGC
when activated.
● 'AGC Disable Fast Adaptation' [AGCDisableFastAdaptation] - Enables the AGC Fast
Adaptation mode.
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