atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's t1 with DMarc Install

I am trying to fnd some info on this. I have been searching on here and a few other sites and a lot on Google.com and have not found really anything worth while. I need to figure out how to do this as I have a pretty decent ammount of install experience with this type of teleco type of stuff but just not a t1 with dmarc.

any ideas???

Not sure what exactly you are asking...What are you trying to do?

well i am basically saying i have a lot of low voltage cabling expereince but nothing with a t1 and dmarc.....i need some direction in to read up on and do a install for....

Really the only thing we as installers have to do for a T1 is to run a cable from the smartjack to the phone system or router.
The telco puts the smartjack and circuit cards in, and it is their responsibility to provide functionality to that point.
Some of our T1 experts will likely chime in soon.

You talking about what type cabling to run? What pins are used? The DEMARC is the Smartjack.

Extending a T-l DMARC:
---> Run data cable from T1 smart jack to where T1 needs to be (you can also extend by using 2 regular feed pairs but to start you off easy just file that in your notes)

---> Terminate cable on 8 conductor box jack near phone system or router & label with T1 circuit number

---> If Smart jack is modular, crimp a stright thru rj-45 end and plug into smart jack

---> Your T1 is extended and all you need is a straight thru patch cord or t1 crossover cable to patch the t1 to your equipment.

Lots of juice flows thru a T1 circuit which is why I terminate the extended end 1st.

The simple explanation for using feed pairs is to make connections straight thru and use pins 1 & 2 and 4 & 5 on both ends (smartjack RJ-45 and 8 conductor box jack).

Good luck...

so if i was going to help out my buddy do this the phone company who is Bullseye, would already have everything there i just simply would only need to run some cat 5e from the 50 pin "smart jack" to where ever he has his router? he is also getting VOIP from Bullseye....i have done pleanty of POTS and rj45 stuff just not really any of this Bullseye t1 stuff.... a bit lost...or I guess I should say I feel lost.

also any suggestions on how to test? i have a cable tester and a tone generator......i am mostly hoping to find some resources to look up to how setup and install a T1......i can punch the cables i would hope and I can run the cable i am just not sure about some of the in-between stuff as far as testing the D50's and so on?????

any sites i can go to get some good reference? :confused:

The term "RJ45" is 1980's terminology, but I think that I understand what you mean. An RJ45 can never support a T1 or PRI circuit. You are speaking of 8P/8C plugs and jacks, right? In essence, all that you need is a two cable pairs rated at CAT1 or better for a run up to 166 feet. If the run is longer, then go ahead and run a CAT5 or better for each circuit to play it safe.

As previously mentioned, a T1 or PRI circuit only uses pins 1,2,4 and 5 on the plug or jack to provide a transmit and receive path. Other pairs are not necessary. The jack at the far end should be equipped with shorting bars to provide loopback when the hardware is not connected (RJ48 wiring pattern) in order to keep the circuit alive if testing is necessary.

Chances are, you can get away with a simple CAT5e cable run, terminated either 568A or B wiring patterns. They must be the same at both ends.

Here are some reference links to give you some insight into the difference between an RJ45 and RJ48 wiring patterns.

RJ48 Wiring diagram

RJ45 Wiring diagram

Here's another link to most other jack wiring diagrams:

Other USOC Wiring patterns in general

so with a T1 is each line on a seperate circuit?? I think I am mostly confusing myself more then anything....i am just nervious about doing this for my buddy and being totally lost and just standing there with a dumb look on my face...