TX_Gain and Rx_gain

[faratell]

what is the meaning of Tx_gain and RX_gain gnb and enb conf files? what is its maximum and minimum?

[fllay]

It depends on your SDR. For example B210
"Gains
All frontends have individual analog gain controls. The receive frontends have 76 dB of available gain; and the transmit frontends have 89.8 dB of available gain. Gain settings are application specific, but it is recommended that users consider using at least half of the available gain to get reasonable dynamic range.
"
It is mentioned in the Ettus doc.