mitel 200 EL LW 19 MOH

[cwc3]

ONS port music on hold had been working
fine on this system for a year and a half
the client decided to get a digital cable
music box and hooked it up with out telling me
now there is a load buzz and when I showed up
I put my buttset across the audio feed expecting
to here a loud buzz and to my suprise it
is in the mitel. as soon as you hook the music
back up buzzzzzzzzzzz well I'm thinking well
I'll try another source so I hooked a pc
and was using it for a music source
Buzzzzzzzzz could the client have fried something
internally on the mitel buy shorting out the audio
I even went as far as changing the card slot
and port of the ons moh port to another card
and buzzzzzzz ... any insight on this you would I go about fixing this I am thinking possibly the mitel is picking up noise from somewhere.

 

[MitelInMyBlood]

The symptoms suggest you have a ground loop problem. Try using an audio coupling transformer, available from places like Radio Shack, etc. If I was at the office I could tell you the make/model of the ones we use.

 

[cwc3]

why did it work fine up untill now?

 

[cwc3]

if you can point me to that part number for audio coupling transformer though that would be great !

 

[MitelInMyBlood]

Check your grounding.
Try replacing the card.
Try isolating the ground on the music source with one of those old 3-prong cheater plugs.

 

[pandabear1]

Dees Communications had matching transformers for music on hold, you might want to try their web site, they sell quality equipment.
Did you try isolating by using your Butt-in as the music source?

 

[cwc3]

yep sounded fine!!

 

[MitelInMyBlood]

Okay, here's what I use.

It's the BOGEN model WMT-1A matching transformer. It's on page 52 of Bogen's 2005 catalog. I recall paying about 20 bucks. We bought several to interface between multiple TV audio sources so our users could literally "dial-up" the sound of any one of about a dozen TV channels. This was on a trade floor where multiple big plasma screens were hanging all over the place, but the sound wasn't on. To hear the sound you had to dial-up whichever one you wanted to listen to. These were going to a multi-port bridge & E&M trunks, but the concept for MOH is exactly the same.

Anytime you connect a foreign audio source to your phone system "best practice" is to always use a matching transformer if for no other reason than isolation.