[asterisk-users] Help 60Hz Hum?

[Mojo with Horan & Company, LLC]

Maybe approach this problem at the wall socket? Could there be ground 
issues in the building that the telco has filters for but asterisk's box 
doesn't? A line conditioning UPS might help.

Moj

Mark Bell wrote:
>
> 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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