atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's extending PRI demarc

Hi newbie here. I'm ordering new PRI circuits from AT&T. They claim that they no longer extend the circuit to a smart jack in our phone room. The local telco's also decline to do it because it is an AT&T circuit. Our equipment vendor also declines. has anyone ran into this problem and how did you rectify it?
Thanks

We do it all the time on our systems and it's really pretty straight-forward. We just run a shielded category 5 cable, put a plug on one end and a jack at the other end. It's really supposed to be a "smart" jack, but a correctly-wired 568A or 568B connection will work just fine.

I have to tell you that if your vendor won't do it, then maybe you need another one. You may also just check for a local data network cabling company. Just tell them you want them to run a shielded category 5 cable run from point "A" to "B".

Ed, why the shielded cable? The circuit is just running across Cat 3 telco/house cable to that point anyway. Up here they just extend the circuit from the CSU on house tie cable.

I have seen the circuits run on house pairs BEFORE the circuit terminates on the telco's termination electronics, but on the output (conditioned) side of it, there are strict limits in the distance that the wiring can go. Usually, this limit is determined by the "line buildout" settings in the electronics. I was making the assumption that they have their electronics located in the basement where the wire run would be lengthy.

Typical T1 distance limitations from the smartjack are a little over 600 feet. 650 pops into my head, but that's probably lab conditions.

We typically use unshielded Cat 5, 568B on both ends, and rarely have trouble. I have seen instances where screened (foil around all 4 pairs) Cat 5 was needed, and even a rare circumstance where real, honest-to-goodness sheilded (each pair in its own shield) cable was required.

OK, so how would you know if you had cable problems between the "smart jack" and the telephone equipment?

Well, although the answer to your question would appear to be obvious, I see what you are saying. Obviously, a simple continuity tester would rule out any blatant wiring problems. I think what you are getting at though; it's those phantom problems that can occur and you want to rule out a wiring issue. Unfortunately, that's not quite as simple and would require the use of T1 test equipment to isolate.

It sounds scary and expensive, but I can honestly say that we have never (knock on wood)had problems with extended wiring we have installed for this purpose.

Run a Cat5 certification on your work. If it passes the wire map & bandwidth test, your link is good.

How far from the MPOE is your switch? You're probably not on the 50th floor of a building where the MPOE is in the basement. That said, some old house cable we had on a job was so bad that we ran new cat 5e from the 22nd floor to the MPOE.

Well actually the CLEC ordered the LEC to extend it to the suite and the LEC could not make it work on the house cable and we ran the cable and left it for him to terminate on both ends so he had that liability. That was a first out of probably a hundred T installs but it happened.

Who knows, but if it was a long run and you ran CAT 6 would that not have less loss?

Your Adtran Ace is designed to compensate for line loss, the dip switches are there but we have never needed to use them.

I spoke with a verizon t1 tech and he said you can get over 1000 feet easy if you seperate the transmit and recieve pairs away from each other.. this is what cuases the 600 feet limit..