[Asterisk-Users] Poor sounds on Adtran 750

[Chris Mason (Lists)]

I changed from a tdm100B card over to an Adtran 750 as I added more PSTN 
lines last week. I have a Sangoma A104u card and 12 channels FXO 
connected to PSTN lines. I am experiencing very poor audio quality with 
hum on the lines and poor volume. When I connected the Adtrans I 
upgraded the firmware to the latest and reset the config to the factory 
default. I also upgraded Asterisk to 1.2.
I am at a loss to explain why the quality has become so poor, has anyone 
any advice?

-- 
Chris Mason