atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's how to term 22ga t-1

A customer is requesting an extension of their T-1 service using a specific 22ga, 6 conductor cable that is rated up to 650'.

Don't think there's an RJ-45 (or 48?) that would work. Would a 66 block, for the 22ga cable, with a punched down(on one side)solid Cat.6 patch cord, 3'-5' do the trick.

Since Cat.6 is 23 ga, I'm not sure if that would limit my 650'.


Verbage off cable site:


Product Description
The 600C Series Central Office (CO) Cables are designed for use between
switching and transmission equipment for distances up to 650 feet. This
series offers the lowest attenuation of all the CO cable products by using
22 AWG conductors. It is manufactured with a dual foil shield for additional
Electromagnetic Interference (EMI) reduction. The 600C series meets or
exceeds all applicable requirements of Telcordia® GR-137 specifications.

RJ48X jacks with screw terminals would work just fine.

I like Jeff's idea - Run the 600C cable and terminate it on an RJ48X. Then patch it with a short patch cord. 3-5' of patch cord won't impact anything.

The 48X allows the circuit originator to test to a short when the patch cable is removed. It's an approved way of installation of T-1s.

If you are running a very long distance (650') then consider TWO runs of cable, one for the transmit pairs and the other for the receive pairs.

Sam

I don't know if 600C has individual shielded pairs, i think not. If it does then ONE run is fine. But if it's just an overall shield AND you're running any kind of distance (>50') then I would run two pieces of cable.

Sam

Been doing so much structured cable, I forgot all about those "biscuit" jacks and had nothing but modular plug/66 block on the brain.

Not sure about the dual foil shield, if it's one over every pair then an overall.

I had a National demand we run this junk in a mall. The distance was over 1,000' and we proposed fiber, but they insisted on this cable. It actually worked, but, for the money and the time consumed, we could have run a 12 fiber that would have given them much more options.

We terminated the cable to a regular ICC RJ-11 jack and used a patch cord to the equipment. It's been in two years and no problems.

Last year, they needed two more T-1 circuits. The national was demanding the same cable. The mall management said "this is the last time for running cable." The company said "we want fiber." We ended up installing fiber directly for the company bypassing the National.

Rcaman

SM Fiber is always a good deal. MM, less so.

The big problem with Fiber is the added cost of the electronics. If the equipment supports a fiber connection, then fiber is a no-brainer.

Sam

Sorry for chiming in so late. It has been a crazy few weeks. I thought I'd add a few more cents in the already constructive thread:

I believe that 600C cable is referred to as 'six conductor' because it is comprised of two twisted pairs, each with an overall shield including an integral drain wire, hence six total conductors. It is low-capacitance individually shielded pair cable.

Hint: If you can get some old IBM type 1 cable, that stuff is perfect for long T1 extensions. It has amazing capacitance and shielding qualities for such applications. It's huge (size-wise) with regard to terminations, but you can practically go forever with it.

If the service provider for the T1 has the LBO (Line Build Out) settings correct on their network interface card, then you can extend a T1 circuit up to 655 feet with minimal effort. Separately-shielded pairs for transmit and receive will certainly make the extension more stable. Keeping the transmit and receive pairs in separate cables will work, but the shielding and increased gauge to 22 AWG will be your best bet for extended distances.

Below is a link to the only modular jack designed specifically for the termination of a T1 circuit that I ever encounter. It has built-in shorting bars that will keep the circuit alive by shunting the transmit and receive pairs together when there is not a plug inserted. It effectively creates a loopback condition. Screw terminals will accept any type of wiring. Verizon has been using them around here for years and they are readily available from any supplier that carries Suttle products.

Suttle 625A28NK-2-XX

That jack is a "Classic" for sure.

IIRC, the transceivers, or as they're called now, media converters, are in the $600+ range. Of course you need two per circuit, power, semi-clean/dry environment, etc..

Appreciate the help, thanks!