> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/voice-and-media/automatic-gain-control.md).

# Automatic Gain Control

According to Wikipedia, "automatic gain control (AGC) is an adaptive system found in many electronic devices. The average output signal level is fed back to adjust the gain to an appropriate level for a range of input signal levels."

### TelcoBridges and Automatic Gain Control

TelcoBridges supports Automatic Gain Control in its [Tmedia](https://prosbcdocs.telcobridges.com/tmedia-documentation/products/tmedia/tmedia) and Tdev products.

#### Automatic Gain Control parameters

* AUTO mode adjusts the input gain to have the desired output level. For example, by setting the output level to 10dBm, no matter how the input level is (too high or too low), the gain will be automatically change so that the output is exactly 10dBm.
* In FIXED mode, the gain is fixed, no matter the input level. For example, if the gain is set to 3 dB, then the output will be 3dB higher than the input, no matter the input level.

**Important note**:

* When using the AUTO mode, the output level is set in dBm
* When using the FIXED mode, the output gain is set in dB

### References

* [Wikipedia article](http://en.wikipedia.org/wiki/Automatic_gain_control)


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