Echo-CS1000E

[zardari42]

Hi, it is CS1000E,rls 5, HA. We are getting Echo while talking on CO lines there are 60 COT lines (loop lines) and every extension and Operator complains that we get Echo while talking on these COT lines, these are mix digital and analog extension with some IP phones, Internal calls are OK. These are four cabinets with first cabinet have both daughter board present on MGC while on othere MGC`s 32 D/Board are installed on each MGC.Maximmum COT lines are in first MGC where both daughter board are present.There is no PRI in system.Some times users also face cutting voice or a breaking voice while talking on these COT lines.
Any advice from where i start to look to remove this echo problem?
Thanks

 

[PERRYPJ]

Are these on a T1 or are they Copper into the switch

OLD ROLMEN WORKING ON NORTELS AND AVAYA

 

[GHTROUT]

You should find out what is in common with the calls that have echo. It may only occur on calls to certain regions/areas/countries. It may only occur on outgoing. It may only occur at certain times of the day. If you identify some of those things, you will have isolated your problem.

My guess is it's the telephone company or long distance provider

~~~
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[pbxn]

If you isolated it and its a telco issue, when the service tech comes out and hooks his t-berd to your span and runs tests, have him also ask his/hers provisioning group if there are echo cancellers on the span. If too many are installed, this can cause an issue. Those will not show up on normal quasi, ones, zeros, etc tests. In fact the span will probably come up clean. Learned this the hard way with the old MCI and a backup path coming out of Atlanta.

 

[zardari42]

Hi all, Below are the answers of yours questions.
(1) There is no T1.
(2) These are COT loop lines (Copper).
(3) Its happening whether it is outgoing or incoming.
(4) Its happen all the time, no specific time or no specific
region.
(5) With a direct set testing (skipping CS1000e and
connecting lines direct to a but set/analog set) these
lines working OK.
(6) Before cs1000e they were using option 11c release 4.0 and
these lines were working OK.Its just happen when they
replaced that 11c with CS1000E,HA.
(7) I also checked by replacing XUT card and by changing
MGC and also by shifting card to other cabinet. with no
success.


I think this may be some configuration problem, any other advice?

 

[PERRYPJ]

Are you experiencing the problem with Analog Phones as well

OLD ROLMEN WORKING ON NORTELS AND AVAYA

 

[zardari42]

yes

 

[phonejack99]

Get the CO's changed to Ground Start, CS does not [play nice with Loop Start CO's.

 

[PERRYPJ]

Can you post one of the TN's of the COT here

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[Gillbo]

I had a problem like this recently and was advised to make sure the cables between cabs were all correctly conneceted.
Even though both ends look the same they need to be connected properly.
I found 1 of mine to be reversed, as soon as i corrected this i got rid of noisy line problems and cutting out of calls.
Worth a try !!

 

[zardari42]

I checked all LAN connections found OK, finally i brought my lab cs1000e and used DXUT cards and CO lines of customer, these cards/lines working fine with my lab system,I cant checked MGC of customer coz it is live system, may be it is MGC problem, another difference was 3 or 4 patches which are not installed at customer site but present in my lab system but these patches refers some other porblem.
Should i check some element manager config e.g Zone/MGC config?

Any more advice?...........

 

[GHTROUT]

Unless you have made enough test calls (various places called many times over) directly from the trunks with a butt set, I would not yet eliminate the Telco carrier or their lines from being the problem.

The way carriers sell each others services makes it very hard to isolate problems with them. Especially if you are using a carrier or "type of service" that few other nearby customers subscribe to.

~~~
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[Gillbo]

I did not mean LAN connections, it is the cables that interconnect each cab together that need to be checked.

 

[zardari42]

Hi GH, Actually we made several calls directly by using But Set/Analog set, infact a whole day we test out lines with but set and these lines works OK with my testing CS1000E, I just wants to make sure is ther any setting through Element manager or LD setting exist to check for Echo problem?

Gillbo it is a CS1000E and Cabinets are connecting through MGC/LAN, i checked these cables and these are OK.

Regards

 

[Tman45]

I agree with Zardari42. It could be the DSX30 or CEMUX cables that go from the back of the primary gateway chassis to the expansion chassis. Those are UNIDIRECTIONAL cables and the end that is labeled 'to expansion' needs to go to the expansion chassis otherwise you can get echo, jitter, and other intermittent issues. Our installer actually missed seeing the label (because it is very small) on more than half of our MGCs.
Best of luck figuring it out if it isn't the solution.
I found a Nortel bulletin about this and posted here:

http://www.tek-tips.com/viewthread.cfm?qid=1470135&page=1

 

[Gillbo]

Timan45,Zardari42
That is exactly what i meant.