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 :-(. Any assistance would be greatly appreciated. Thanks in advance.................>>Greg Gregory P. Scasny Golden Technologies Inc. http://www.golden-tech.com <http://www.golden-tech.com/> 219-462-7200 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20040422/4945af8c/attachment.htm
I'm having the _exact_ same problem. Is your POTS line, by chance, a fiber circuit from the CO and then analog to your location? Mike Greg Scasny wrote:> > > 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 <http://www.golden-tech.com/> > > 219-462-7200 > > >-- Michael Welter Introspect Telephony Corp. Denver, Colorado +1 303 674 2575 mike@introspect.com www.introspect.com
> I have an (actually 2) Adtran TA750s with 8 FXO ports. I get a terrible buzz on every FXOport. 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 Is with 12 FXO ports. When I plug the same analoglines 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 cablefrom the demark to the TA705 and still lots of buzz.> > > > I have duplicates of every part for the TA750s and swapped every component and cannot get ridof 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.Well, you're the second one in a rather short period of time that has complained about the exact same hum/buzz when the Adtran 750 is used with FXO interfaces and with X100P cards. There was another posting earlier today in which the individual made a comment the 750 FXO interface does not support impedence matching. I thought the statement was rather strange, but since I don't own one of these units, I went to the Adtran site in search of a technical description of the FXO card. I couldn't find one, and for that matter, it appears Adtran has little reference to the 750 being used with any FXO interface. (Its almost like they know there is a problem and removed the 750 FXO options. Selling as FXS only now.)