Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1056
  • Last Modified:

T1 Wiring

Hi there, I'm trying to extend T1 circuits and I need to know if Im doing it right.  I'm taking it from the NIU that the phone company installs and taking it inside a building to an RJ45 Jack (568b)  I know that they run on 1,2,4, and 5 but do they swap blue/white and white/blue like a normal data connection would?  And could someone clear up the order of a 4 wire cable for me?  The Green Red Yellow and Black  What's the order in relation to the orange and blue pairs on a cat 5 cable?  Thanks
0
novaman64
Asked:
novaman64
1 Solution
 
razorwoodsCommented:
If all you're doing is extending it, and it's less than 1000feet you can just make a really long (normal) straight cable with the single swapped wire.
0
 
novaman64Author Commented:
Its an 1100 ft run...
0
 
razorwoodsCommented:
You're still fine.  I like the 1k ft rule, but in actuality you can get away with up to 3k ft off set from the smartjack, however you should really start thinking about a repeater if you go to 3k + ft.

Most repeated T1 spans are two metallic wire twisted pairs with regeneration around 36dB insertion loss pts based on 772KHz NYQUIST (one half the T1 line rate), and Roughly at 6000 Feet, or depending on AWG used.

CAT 6 twisted pair can be used, as long as transmit & receive are run in separate cables to reduce the incident of cross-talk errors when T1 signal losses are 15dB or greater between TX & RX.

At 1100ft you're fine without a repeater and within the same cable.
0
Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

 
novaman64Author Commented:
So with that being the case then what color (T1) goes to what pin number (RJ45 - 568B) jack?
0
 
razorwoodsCommented:
Pins 1 - 8 going Left to Right (568B ATT)
O/ O G/ B B/ G Br/ Br

** Again standard straight cable.

0
 
CPAsAdminCommented:
EIA/TIA 568B                            
                   Assignment   Pair    Color - UTP     Color - Old Style
   +--------------- Tip Pair 2  2       White/Orange    Black          
   | +------------- Ring Pair 2 2       Orange/White    Yellow
   | | +----------- Tip Pair 3  3       White/Green     White          
   | | | +--------- Ring Pair 1 1       Blue/White      Red
   | | | | +------- Tip Pair 1  1       White/Blue      Green
   | | | | | +----- Ring Pair 3 3       Green/White     Blue
   | | | | | | +--- Tip Pair 4  4       White/Brown     Brown
   | | | | | | | +- Ring Pair 4 4       Brown/White     Orange
0
 
novaman64Author Commented:
So since the T1 one only uses 4 wires at the pole, assuming I maintain the same color codes for the 1100 ft run between the pole and the jack (black, yellow, green and red)...  The black goes to the white/orange, yellow goes to orange/white, green to white/blue and red to blue/white on the jack?  

Then from the jack I just use a standard cat 5 cable to the router which is only a 4 foot distance?
0
 
Don JohnstonInstructorCommented:
If all you're doing is extending the cable, you don't move any pins/conductors. Just straight through.
0
 
razorwoodsCommented:
In other words, if you're just extending the line it you just take same pin to same pin.  Aside from ' standards ' it wouldn't technically matter what colors you used or if you crossed any pairs.

0
 
novaman64Author Commented:
partially correct, the ISP helped resolve
0

Featured Post

Who's Defending Your Organization from Threats?

Protecting against advanced threats requires an IT dream team – a well-oiled machine of people and solutions working together to defend your organization. Download our resource kit today to learn more about the tools you need to build you IT Dream Team!

Tackle projects and never again get stuck behind a technical roadblock.
Join Now