Difference between 568a or 568b Network Wiring

shows the two different methods of wiring jacks, RJ-45, or patch panel for TIA-568a or 568b wiring. The main difference is in the positioning of the 2nd and 3rd pairs (orange and green).

Most network jacks made in the past 15 years have the ability to be wired for either 568a or 568b. And, the jacks usually have a wiring color key printed on them to indicate where to put the wires for either pattern.

Once the wires are laid out in the appropriate pattern in the jack grooves, the technician then “terminates” the jack with a “110 Punch Tool”. (see Networkadvisor.net for list of common tools)

Is one wiring method faster than the other? People will have opinions about this, but I have not seen any real evidence that one is faster. It is worth mentioning that the 568B wiring is the MOST common in the U.S.

It is important to note that you need to stay consistent with one wiring pattern or the other throughout the entire network. If you are adding on to an existing network, you need to first determine if that network is wired for “A” or “B”. And then, match that wiring method.

There is also another wiring pattern known as USOC, this was more common back in the 70’s and 80’s for phone wiring. You want see it much any more. Unlike 568a/b, it fans the pairs out in a expanding concentric pattern. Blue in the center, Orange on pins 3/6, Green on pins 2/7 and Brown on pins 1/8. USOC is not used much anymore.

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The Bowser Journal says:

The reason you had a “B” only jack is when the industry went to IDC style jacks you had to purchase the right jack with the configuration you wanted. They actually stocked both “A” and “B” jacks. They quickly realized that doubled the shelf space in warehouses and thus the dual wiring scheme was born. BTY the ton in Leviton is pronounced like ton (weight) not on as in a light switch is on. I am a Technical Trainer for Leviton and really appreciated this video! Not because of you talking about our products but because you put it into simple terms which is critical with anything technical. Good job!

Reuben Soularie says:

So that Straight across Jack. I noticed you had wired it differently from the diagram where you flipped the white green and white blue. But the diagram showed differently, can you explain that. The diagram for B on the straight across jack read as white orange, orange, white blue/blue/whitegreen/green/whitebrown/brown. the jacks I’m working with are straight across like that but are arranged where all the pairs are together and the green pair doesn’t straddle the blue pair.

Jason Chandler says:

With over 20 years in the industry for some reason the government usually uses pattern A 99% of you’re installs you’ll be using pattern B

Joseph Odhok says:

very useful thank you for that video

Brician Mcwilliams says:

Excellent job

moha glade says:

can you make a video about the colors inside the blocks to recognize wich line im working on

bennettste says:

In the UK and Europe B has been the standard from the early 90s. We always thought that A was the US wiring standard. Great Videos by the way.

Jeff Moss says:

nice tutorial. years ago when I first started out (at the age of 12) used Panduit jacks. I did not realize that the color code on their minicom jacks was not the proper 568B order – I thought I knew everything about cabling and was quickly corrected by an instructor!

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