atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's Installing T1 from Demarc

OK, I'm sure I'll find out tomorrow if it's still down. Then I'll try it the other way. Thanks.

Another thing to do is take a fluke. Make sure you show a short across Pins 1&2 and across 4&5. If you only have 1 conductor passing thru on 1 of the pairs a lot of equipment will show carrier but will not come up. This should prove your cable and heads are good but your pairs may be reversed. Normally on a outdoor mount around here atleast if you are needing a straight thru cable then Red/Green would be Blue/White and Yellow/Black would be Orange/White. This should give you a straight thru cable.

If this was handed off to you correctly the first pair should be the receive from Telco and should go on pins 1&2. First pair in the case you are discribing is red/green

T1 is up. Thanks guys.

Kevin,
That's great news! Can you share the "fix" with us? Was it simply a matter that the transmit and receive pairs (1&2 / 4&5) were reversed?

Actually a couple of things. I did have the pairs backwords on the terminals. After switching them around it still wouldn't come up. After putting a hard loop at the NIU, the tech could see the loopback. So I knew that was fine. Did the same thing at my jack going to the router, also good there. Turned out to be a bad patch cord from my jack to the router. Brand new cord too. Swapped it out and it came right up. They also had ISDN back-up which may have helped trouble-shooting.

Thanks for the update, Kevin. :thumb:

I will be extending a T1 from Demarc to Office. I beleive they will bring the T1 in the basement and I will have to run telephone lines and the T1. I plan on running cat5e (4pair) ... 3 lines for telephone and 1 line for T1. I never installed a T1 before so this will be new for me. My guess is that I will wire a cable with an 8 pin modular plug on each end also known as "rj45" with t568b on both ends and that will plug directly into router from smart jack?

Will I have to have any special jacks or plugs?

RJ48X (smart jack) is what the telephone company will install correct?

So basically i will be creating a very long patch cable. Will this work?

Yes it will work.

Thats pretty much it Irvin.