[Asterisk-Users] Adtran TA750 Noise

[Greg Scasny]

All, I need help. I have an (actually 2) Adtran TA750’s with 8 FXO ports. I get a terrible buzz on every FXO port. If I unplug the Adtran and put an analog phone on each incoming line, I have no buzz. I also have 2 Carrier Access Access Bank I’s with 12 FXO ports. When I plug the same analog lines into either one of those, no noise or buzz whatsoever.   I went so far as to move the TA750 to within 5 feet of the demark and ran a short CAT5 cable from the demark to the TA705 and still lots of buzz.   I have duplicates of every part for the TA750’s and swapped every component and cannot get rid of the hum on either unit. I have the power supply of the Adtran grounded. I am out of ideas L. Any assistance would be greatly appreciated.     Thanks in advance……………..>>Greg   Gregory P. Scasny Golden Technologies Inc. http://www.golden-tech.com 219-462-7200