User's Manual 214 Document #: LTRT-10532
Mediant 500L Gateway & E-SBC
2. From the 'AMD Mode' drop-down list, select Disconnect on AMD, and then click
Apply.
Note: The feature is applicable only to digital interfaces.
14.6 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, 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
ini file parameter AGCDisableFastAdaptation. After Fast Mode is used, the signal should
be off for two minutes in order to have the feature turned on again.
The following procedure describes how to configure AGC using the Web interface:
To configure AGC using the Web interface:
1. Open the DSP Settings page (Setup menu > Signaling & Media tab > Media folder >
DSP Settings):
Figure 14-13: AGC Parameters
2. Configure the following 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.
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