atcomsystems.ca/forum Forums TDM Business Telephone Systems Nortel Telephones & Systems No free lines, 3 T-1's??????

MICS 6.1 xc, 3 T-1's, non-PRI.

This customer is a collection agency, so as you imagine, outbound traffic is high.
They intermittently get "no free lines"
even though they have 64 channels in Pool A (8 channels are in pool B for their legal dept.) This happens even when there's only 10 or 20 people in in the morning or on a Saturday.

The carrier says they have never hit ceiling.

We've troubleshot our balls off and can find nothing wrong in our system cofig.

My hunch (and tech support) says it's the carrier. They disagree.

What we have here, boys, is a Mexican stand-off.

The main reason I am second guessing myself is that in another post I made with a similar problem on a 3-PRI system it turned out to be CbC limits. That parameter is not available on a straight T-1.

Is there an equivilant parameter I am over-looking??

If your carrier says they aren't seeing all the trunks busy, I'd have to believe them. If they were trying to deceive you they'd tell you they were so they could sell you another T1. Does your carrier have monitoring equipment on the T's so they can see if they are clean? If not do you have access to a Tberd or equivalent with a lid to break out the channels? Your going to have to put it in or out of the switch and that's the only way I know how to prove it.
Bill

Well, The strangest thing happened on that job.

As I browsed the the lines to see if they were busy or idle in maintenance. I found that the system could only access 22 channels of the 3 t-1's. The rest said "unavailable" including the entire 3rd T-1.

So I disabled and re-enable all the cards and poof.....72 channels!!!!

I hope it was a glitch and not just a symptom of a bigger prob.....

I must not have paid attention in class. how are you getting the third T-1 into the system? I know they changed a lot on the 6.1, but I was not aware of the addition of another T-1.

with 6.1 and new gen T1 card you can install T1 cards in other tan core slots, I think up to 4.

My understanding is that with 6.1 XC you can only have 3 T-1's max. The 3rd occupies slot 1 of a 12x0 and requires an "AAAA" card and renders the other 2 slots unusable.

Well, it's been over a week and I went back there on other business and it's still happening.

I dialed "9" and got line 18 (it starts @ line 108). I then went into maintenance to check the busy/idle state of a few lines and they were "unavailable" (as opposed to again busy or idle).

SO...what I had hoped was the problem is actually a symptom that can be fixed in the short run by de-provisioning & re-provisioning the channels one by one, or resetting the cards one by one, or probably the entire system.

What could be causing 2/3's of the total channels across 3 T-1's to lock up?.....

Can't be bad cards because it's on all 3 T's.....maybe S/W corruption or telco is all I can guess.

Assuming the T's are good, since you haven't said otherwise, next time have telco see what state they see the trunks in. Sounds like your not releasing and the trunks are taking themselves out of service.
Bill

not releasing???
As in disco supervision on a CO?

elaborate, please....

Yes, either not receiving release supervision or not releasing. That is why I said have telco see what they see on the trunks, they can also set up a trap to see when and why they fail, trap will come from supplier of the trunks. Also Tberd makes a great test set that will break out each channel and can be hooked up to a printer, they are expensive so maybe you can find a tech in your area that has one, might even get lucky and have telco put one on for you, but I doubt it.
Bill