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Joined: Apr 2005
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Well I'm back with this year's unsolvable DXP dilemma!

We're running a Comdial DXP w/2 PRIs as our main 2 trunks. The ARS is programmed to go through one PRI and then the other, so one PRI handles most of the calling (the other was really there for expansion/conference calling).

As of about a week ago, we developed a severe PRI echo/slippage issue. Some calls go through fine, others slip so bad that the voices sound robotic and there's a lot of echoing and/or completely cutting out.

I had our phone vendor look at the system, they see nothing wrong. Telco looked at/changed a few things on their end to no avail, they had Verizon do intrusive testing on the lines and they say they're clean to the smartjacks.

At this point everything is starting to point to our system and the wiring. I checked the wiring on the 2 PRIs from the smartjacks (1st floor) to the pbx, and found the the second PRI (unused) had pins 7-8 crossed, which really shouldn't matter as far as I know. I moved the 1st PRI to a spare run and that didn't seem to help - still echoing.

Anyone have any ideas?

Incidentally, since I know it'll come up, all PRI channels are set to nominal padding in VMMI.

(I'm not the installer, just the system admin here who's very phone-savvy :-))


Mitel 3300Mxe running MCD 4.0, 5340 Phones
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Also...

I have all channels on both PRIs mapped to a console box at our receptionist desk, and saw the echoing when selecting random channels of both PRIs.


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Pad -2 DB loss and retry. Not going to fix your slippage problem though.


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Will try that if we get other probs resolved - we did get echo occasionally but not all the time. Now its full time.

Question - right now the system is simply reporting "sync found" and "warm start" errors. If I go into VMMI under System --> T1/E1 alarms, and set all options to have a threshold of 1, would that then log those types of errors? The telco was asking if theres any way to get advanced diagnostics through the pbx (DXP).


Mitel 3300Mxe running MCD 4.0, 5340 Phones
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Yes. At least that's the way I do it.

Justin

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Ok this is interesting...after seeing many many errors the past few days, Verizon "tested" the lines clean, and in addition, I moved our main PRI to a different run to see if it was noisy at all. I haven't gotten an error since then, but the echoing is still baaad - literally like the announcer at a ball field bad. Makes our music on hold sound interesting though.


Mitel 3300Mxe running MCD 4.0, 5340 Phones
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when in doubt change the syn card, the T-1 PRI card and the services card. One at a time. In that order. See which one clears the problem.

Jim Hoey
SST Communications
Long Island, New York

6319560100


Jim Hoey

SST Communications
597 West Montauk Highway
Lindenhurst, New York 11757

631 956-0100

www.sstcom.com

Business telephone systems on Long Island and New York City like Comdial, Vertical, Avaya, Panasonic
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Wow I was actually thinking that. Thing is though, ever since I looked into the wiring I've gotten zero errors. I even enabled all the advanced logging options - nothing. Could that still be the sync card? Its currently set to get timing from the telco.

Replacing the PRI boards would be expensive at over $xxxx a piece (used). I doubt its them since both PRIs have the same problems.

[Please don't include any pricing in the open forum. Thanks!]


Mitel 3300Mxe running MCD 4.0, 5340 Phones
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One way this might be troubleshot is to connect your Pri boards back to back. I've never had an occasion to do this, but logically it should work!

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Quote
Originally posted by jwooten:
One way this might be troubleshot is to connect your Pri boards back to back. I've never had an occasion to do this, but logically it should work!
It will work, good idea. :thumb:

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