Mitel Forums - The Unofficial Source

Mitel Forums => Mitel MiVoice Business/MCD/3300 => Topic started by: Mattmayn on October 28, 2008, 10:52:17 AM

Title: Echo on 5340
Post by: Mattmayn on October 28, 2008, 10:52:17 AM

I have a site with roughly 150 5340s and they are reporting intermittent echo. I do not believe that it is the network as we have a dedicated network set up strictly for their phones.
The only thing that I can find on Mitel's site refers to LS trunks (I have PRIs). Has anyone else experienced this, if so what is the fix/cause?

Title: Re: Echo on 5340
Post by: Mattmayn on October 28, 2008, 11:18:19 AM

I guess I should include that it is an expanded MXe running 9.0.0.41.

Title: Re: Echo on 5340
Post by: ralph on October 28, 2008, 11:23:57 AM

I have seen this a couple of times.
(1) LS trunks not matching impedance.  (you don't have)
(2) Jitter/delay on network  (probably not)
(3) Not enough echo cancelors  (maybe.  How many calls are going at same time and how many DSPs do you have?)
(4) PRI is too hot.  (This is where I guess it to be in your case.)    I'm not sure I understand this, but I had a problem with echo.  We worked with the carrier and determined that the PRI was coming in too hot.   By adding padding to the PRI smart jack, it resolved it.

Ralph

Title: Re: Echo on 5340
Post by: Mattmayn on October 28, 2008, 12:14:02 PM

I have a QUAD DSP and a DSP II along with a 128 channel ECHO Cancler. I have 2 full PRIs and one half but the normal call volume is maybe half of this.
How were you able to convice the provider that this was their issue? I am assuming this could be my problem since the CO is two blocks away.

Title: Re: Echo on 5340
Post by: ralph on October 28, 2008, 02:07:57 PM

We called a vendor meet.   This was actually a 3rd party carrier.   The vendor meet requested a tech from the carrier and AT&T since they were actually bringing the circ into the building.   

AT&T never showed.   Big surprise I know.   
Putting a T1 tester on the circ showed the DB level too high.

The other tech, managed to add the padding to the circ.   He actually did it without "touching" the AT&T equipment. <g>

Ralph

Title: Re: Echo on 5340
Post by: Mattmayn on October 28, 2008, 02:21:41 PM

I'll see if I can get AT&T to play fair then. Thanks.

Title: Re: Echo on 5340
Post by: v2win on October 28, 2008, 03:22:58 PM

Possible speed/duplex mismatch issue on the network?

Title: Re: Echo on 5340
Post by: ralph on October 28, 2008, 04:59:54 PM

I suppose it is possible.   More likely you'd get clipping though.   But good point.  Be sure all ports are set to "Auto Negotiate" or "100/Full".  Both phones and switch ports.   If you set a port to 100/full and the phone stays at "auto neg" it will actually auto neg to 10/half.   Not good.  You get lots of collisions.

Ralph