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PRI Circuit is bouncing?

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trinetintl

trinetintl

Vendor
Mar 15, 2010
730
US
Hello Everybody,

Our local telco that is providing one of our customer with a T1/PRI is telling me that he has seen the circuit bounce a couple of times and he is concerned, he is also asking me if we have the interface setup to recover timing from the loop. He originality asked me if I have been rebooting the system but I have not.
I am a bit lost here, what does he means by all of this and how do I check to see if I have the timing from the loop turned on? The only thing I see is the CRC Checking which is ticked...!

Could this be a distress sign of brand new T1/PRI board that is bad or about to go bad?

Thanks,

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We had to extend the smartjack or the T1 about 230ft with a CAT 5 cable but left the haul length set to 0 to 115...could this be the problem? We usually leave this alone because 99% of the time the T1/PRI is next to the PBX.

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That is a long cable run, but in theory should work, I would set the haul length to the correct value though :)

 
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check the Avaya docs
I don't know about a T1 but in the UK they say a Pri cable should not exceed 3M

A Maintenance contract is essential, not a Luxury.
Do things on the cheap & it will cost you dear
 
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IPGuru, that sound awfully small only 3 meters? My other alternative is to extended it using CAT 3. I am changing the haul to 180-312ft to see what happens, unfortunately the site is very busy, I set it up to reboot when free but this may not happen for a long time, maybe after 5.
I will keep you guys posted..!

Thanks,

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When there is a PRI overhere then there is always a modem or router that provides the actual PRI.
Everything in front is most of the times a 2 or 4 wire connection straight from the provider.
So i always put that modem or router next to the IPO.


BAZINGA!

I'm not insane, my mother had me tested!

 
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The phone system used to be next to the smarjack but it was moved, I just talked withe the carrier and he agreed that the circuit should work with that length.
The system was able to reboot but the circuit got worse, could this be a cable issue then? We are turning back to the 0-115 to see if it gets better.


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But basically, it used to be OK then you extended the cable by some considerable distance and since then issues have come about, it must be the distance/cable but probably just the distance :)

 
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So if I got this right.. The PRI did not have an issue until you extended the dmarc 230ft Is that correct ? The clock quality shoule be set to network.
Run Monitor and see what kind of errors you get.. It should isolate the issue easier than just changing settings..

 
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Indeed, move the smartjack to the IPO.

BAZINGA!

I'm not insane, my mother had me tested!

 
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The PRI is brand new, we are replacing a bunch of analog lines with it, we recently upgraded them to a 500 R8, it took almost 2 months from the time of the upgrade to when the PRI got approved and installed and as part of the project we move the IPO to the computer room, just today we switch all outgoing traffic to the PRI and as a matter of fact we are very lucky because we have the luxury of testing the PRI before we put it into production before me port all the analog numbers.

NYSTECH I will follow your advice.

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I just put in an IPO today and also i have the luxury of testing the PRI today before all BRI's moved to the PRI.
I have a Cisco router that has a PRI card in it (SIP to PRI)
It is right under the IPO (19 inch model)
I alway move those equipment to the same room as where the IPO is.


BAZINGA!

I'm not insane, my mother had me tested!

 
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It could be interference somewhere in the cable run. Cat-5 should be o.k. but T-1's are supposed to be extended on 2-pair individually shielded cables with a ground wire and terminated on RJ-48x jacks. Although, I have extened T-1's on house pairs upto 1000' with no issues. Perhaps have the Telco provider test the extension with a BERT tester first.
 
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well if customer would allow it,, you could bring the IPO to the original dmarc and plug in PRI there and see if you have same issue.. tha would eleiminate the extened wiring

 
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NYSTECH, yep that is another good idea... unfortunately cannot be done during the weekday and it is a looong 3 hours round trip.

Something interesting just happened...we had the PRI on an a separate ARS for users to access it by dialing 4 instead of 9, everything seemed to be working OK under a very light load, just a couple of minutes ago we decided to put the PRI back into production under 9 and once traffic began to increase all of a sudden the PRI crashed, got yellow, red, blue and trunk out of service alarms, we took it out of production under the 4 and with very low traffic the PRI is back up and running without any hiccups...it sound kind of interesting and I am now more suspicious of the carrier than the cable or the IPO Universal PRI board or the configuration, what do you guys think?

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Just a quick update...I exchanged emails with the Telco Provider and he confirmed he was able to detect errors on a leg between them and the local carrier, a work ticket has been opened. [thumbsup2]

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One last followup guys and just to confirm to everybody that 95% of the time it is the carrier and not the IPO, after several email exchanges with the carrier they found the screw up and the circuit is now up and running, incoming and outgoing calls with the d-mark extended with a 230ft CAT 5 cable and the haul length set to 0 to 115.

Thanks everybody for all the feed back and the great help. [thumbsup2]



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