Major Issue with Nortel SL1 Meridian switch 1

[Chr1st1an]

2 days ago I started experiencing issues with the Nortel phone switch, it started with a few phones loosing dial tone but then they would start working again out of the blue. As of today, more and more phones randomely began to experience the same issue, phones have no dial tone but when they are called they ring just fine and also when calling from them they do appear to call out ok even though there is no dial tone. Also when calling sometimes the receiving call party cannot hear at all. The phone support company has reset cards left and right and still no luck, the problems appear to be getting worst. Anyone out there that has experienced a similar issue? Maybe shed some light because I am at a loss.
Thanks!

 

[bignose21]

what sort of switch is it CS1000 E/S/B or an option 11/51/61/81 ? what software level?

 

[Chr1st1an]

It is an option 81 switch.

 

[bignose21]

are all your problems localised to one ipe shelf or 1 network group?

 

[Chr1st1an]

It appears to be on all of them. tried swapping cards around and the issue followed. It happens to certain lines that are on a completely different shelf and then it goes to another one...

 

[Chr1st1an]

Oh and I also did a sysload and the issue remains. How can that be? I do not hear dial tone but can still call and receive calls...

 

[GHTROUT]

It sounds like a Tone & Digit Switch card. Otherwise labeled as Conf/TDS on the faceplate of the card.

I'd look at the LD22 REQ PRT AHST for any errors that start with "TDS" and follow those to a bad card.

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[StanleySteamer]

Are these analog(TYPE 500) phones? The symptoms indicate a bad DTR card. Or maybe just not enough DTR ports.
Try TRAC'ing the phone when you are off-hook and don't have dialtone. If you see a TTR TN then that would indicate the bad DTR.

 

[Chr1st1an]

Looks like it has been narrowed to one Network shelf. Moved the card to another shelf and everything seems to be working ok for now. But I still need to figure out why that shelf is having challenges. Thank You all for your suggestions!

 

[GHTROUT]

My experience when there are bat DTRs is you get dial tone, but cannot break it. Either way, both the DTR and TDS are going to produce TDS messages.

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[StanleySteamer]

Yes you may be correct about bad DTR's giving dialtone but my experience is that they usually do not cause an error message.

 

[bignose21]

Try swapping out the Conf/Tds card on the network group you suspect with one from a working shelf, does the problem follow the card.

 

[Chr1st1an]

The card was moved from one from one network group to another one. The issue appeared to be corrected for approximately one day. Today the issue re-appeared and it progressively gets worst as the day goes by....it is getting pretty weird. A minute ago a user received a call from an external caller and for about 30 seconds the caller could not hear the receiving user here at the property.

 

[GHTROUT]

The card you moved - try just leaving it out for a few hours or even all day. Then if the problem keeps up, you know that's not the bad card. So pull another one out and see if the problem goes away.

You have little to lose - it's worth running low on working cards if the alternative is running on defective cards.

Otherwise, buy one Conf/TDS and use it as a replacement around the system until the problem stops.

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