Audio troubles, buzzing sound with ATA

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laurent
*Go-To Guy*
Posts: 532
Joined: 08/06/2010
SIP Device Name: Grandstream HT-502
Firmware Version: 1.0.1.63
ISP Name: DSL TekSavvy
Computer OS: OSX Snow Leopard
Router: Linksys WRT54GL w/tomato

Audio troubles, buzzing sound with ATA

Post by laurent »

This is a new thread in an effort to keeps topics clean. So you were saying:
qwerty wrote:Thanks Laurent, yes I do have the same noise when I call voicemail. In fact I hear it even during dial tone... My home is a recent built and I wired my telephone myself with shielded CAT5E for telephone and CAT6 for networking (both as a star network). Cable length or age of cable is not a factor. Both my videotron phone modem and may FPL VOIP modem are located in the basement so the setup (cable length, jack, etc...) is the same during my tests. Clear line Videotron, faint buzzing on FPL. Everything else is perfect, I am sure the solution is hidden in the settings.
Can you plug a phone directly into the ATA with nothing else? I understand Videotron's ATA works good but it's still a valid test.

Which pair did you use for phone in your CAT5 cables? Central pair, blue/whiteblue?

Your problem appears to be electric related, not "internet-software-codec" related. Is the ATA close to the modem? If so, move it away. Actually, try to move the ATA and it's cables at least 1 meter away from everything electric or electronic. Make sure no 120 volts electrical cable run near the telephone wire, or near the ATA. You could also grab an extension cord, and go get some juice from another room and plug your ATA (and only your ATA) in it.

These wonderful plastic electronic devices are incredibly NOT tolerant for interferences, and most of them spit out a large quantity of it themselves! I've had modem issues when they were too close to a router, for example. Use your cordless phone, call something where you can have silence, like your cellphone perhaps, and then while listening, move stuff around a feet or two.

You might have interferences coming from the supply cables, from the network cables, from the air (emission from another device).

You could also have ground loop problems, and this we can tell if you remove the house cabling from the ATA, and plug your cordless base station right in it.

Oh and the cordless base station could also be picking up interferences. If all else fail, try another phone just to prove me wrong :)
qwerty
Quiet One
Posts: 27
Joined: 10/23/2010
SIP Device Name: Thomson TG784 & 780
ISP Name: Fibernetics
Router: Thomson TG784 & 780

Re: Audio troubles, buzzing sound with ATA

Post by qwerty »

Laurent, FPL should be paying you for the top-notch support you are giving. Thanks. I will do more testing and will report back.
zombie999
Lightly Seasoned
Posts: 202
Joined: 10/17/2009

Re: Audio troubles, buzzing sound with ATA

Post by zombie999 »

What kind of phone do you use?
If it's powered and grounded, it's most likely caused by ground loop problems (like laurent mentioned). In that case try a ground cheat.

Do you use a UPS?
laurent
*Go-To Guy*
Posts: 532
Joined: 08/06/2010
SIP Device Name: Grandstream HT-502
Firmware Version: 1.0.1.63
ISP Name: DSL TekSavvy
Computer OS: OSX Snow Leopard
Router: Linksys WRT54GL w/tomato

Re: Audio troubles, buzzing sound with ATA

Post by laurent »

qwerty wrote:Laurent, FPL should be paying you for the top-notch support you are giving. Thanks. I will do more testing and will report back.
Thanks, I appreciate the comment :) I enjoy helping other and I love playing with tech toys, this forum seems like a good fit.