[asterisk-users] Help 60Hz Hum?

[Matt]

If necessary a 1:1 transformer on the voice lines might clean your audio up
for you.  One transformer on each line.

On 10/6/07, Mark Bell <markb at pilgrim.com> 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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