[asterisk-users] Help 60Hz Hum?

[Mark Bell]

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

 

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20071006/c4da1872/attachment.htm