Hey guys,
I am trying to diagnose a hum in my FXO lines I am using an Adtran 750 with 8 FXO ports. I am getting a pretty bad hum on the line during a call. I have checked the Telco side of the 66 block and there is no hum there so it's my problem to fix. I have tried to lower the gain but that reduces the call volume to much. Where else should I be looking? Setup as follows Dell PE1950 server Redfone Quad port fonebridge2 Asterisk 1.2.18 Zaptel 1.2.18 From redfone Adtran 750 Channel Bank with 8 FXO and 16 FXS Two PRI connections to fonebridge TIA Mark
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