atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring extending t1 to rj45 jack

Last saturday was my first time that I have extended a cat5e cable from the demark to the termination point in the wiring closet and have just one question. I went to terminate the cable into a rj45 jack made or distributed by infinity but the jack color codes do not conform to tia568 standard. It starts of with white/blue and blue then white orange.

I ignored those and juse used the pin number to use the four wires 1245 for the t1 standards to terminate at the jack. Once that was done hooked up the cat5 molded strait though drop cable from there to the router. ATT could not telnet into it. I then put on a jack on the end of the cable and ATT could telnet into the router.

I checked the jack with a digital multimeter and got some odd sequence how its wired on its little board. Since I dont have time to mess with does rj45 jack come with a strait though configuration?

I have never questioned this because I have done my share of cat5 cable and did not have issues.

I was thinking of buying amp connectors with a strait though configuration to end this t1 extention.

It should definitely only involve pins 1,2,4 and 5, wired straight-through, but should NOT simply be terminated on an "RJ45" jack. It should be terminated using the proper jack that incorporates shorting bars to maintain loopback. These are not something you are going to find in a computer catalog.

The jack that you referred to as made by Infinity are probably the ones designed for USOC applications using RJ31X, RJ41X, RJ45S or RJ61X wiring patterns. Your devices need to be in compliance with RJ48C wiring patterns for a T1. I would advise against cutting corners with a $2.00 part that's carrying a T1 circuit.

here is more information.

https://www.arcelect.com/RJ48C_and_RJ48S_8_position_jack_.htm

As I've been moving T1's this weekend, this comes in handy. I'm curious about this phrase describing the RJ48C in the link that home2 provided "...conductors 7 and 8 provide cable shield integrity..." I install cables for T1s same as I do for ethernet so looks like, if this an issue, I'm covered. Soooo, to make sure I'm reading this correctly, as long as I have pins 1,2,4, and 5, should be ok, right?

Also, how does one make those little loopback testers? Pins 1 and 2 to pins 4 and 5?

1-4 and 2-5.

1 goes to 4, and 2 goes to 5, for a loopback tester?

You got it.

thanks

I make up my cross-overs and loopbacks using keystone jacks instead of crimping RJ45 plugs.... That way I just use standard pre-made straight-thru cables on either end, and it works perfectly well.

This RJ jack is RG48X, whAT IT HAS IS A SHORTING BAR BELOW THE ACTUAL PINS THEREFORE WHEN THE RJ45 PLUG IS TAKEN OUT THE SHORTING BAR WILL TOUCH TOGETHER THE PINS 1 2 & 4 5 AND THAN IT ACTS LIKE A LOOP BACK.