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.

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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[TheBowserJournal]

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!

[HCkev]

As a phone and fiber guy, I tend to prefer T568-A as it allows you to also use that jack with phone systems and have to the two lines follow the pair color code (i.e., first line = blue, second line = orange), while with T568-B, the second line would go in the green pair instead.

And it's also good to know you can use a T568-B patch cables in jacks or patch panels wired for A without losing any performance. As long as the connections are the same on both ends of the cable, i.e., Patch panel T568-A > cat5e > keystone jack T568-A > RJ45 connector T568-B > cat5e > RJ45 connector T568-B. Most of the pre-made Ethernet cables here are wired T568-B.

[bennettste]

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.

[gothamnetworks]

On a recent cabling job three groups of different biscuit Jack's (another nickname for what he's showing you here) were purchased, all three were Leviton, but each of the three were very different from each other. The first group was bought from Graybar and I had bought some backup ones from Home Depot, we had some problems with the Graybar ones working so we went to punch down into the Home Depot Levitons. My punch down tool would fracture the Home Depot biscuit Jack's they were completely worthless. Finally I went to an electric supply store and bought the final group of Leviton which were clearly Superior to even the Graybar ones a stick of butter would have been superior to the Home Depot ones. The lesson to learn is not all Jacks are the same even if made from the same manufacturer. Leviton make some great ones and they make some absolutely piece of doo doo ones.

[jeffmoss]

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!

[James_Knott]

568A matches USOC and telecom cabling. That Leviton patch panel even indicates that by saying A & telecom is the other side of the strip. As for those wide connectors, the only time I've seen them is with tool less connectors, which fold over the wires. They are too wide to use in 4 or 6 position wall plates and patch panels. I used to have a boss who liked them, but I and another tech hated them.

[chemyguy]

Great info just starting and thanks for YouTube makes running my home network a little easier.

[gothamnetworks]

On a recent cabling job three groups of different biscuit Jack's another nickname for what he's showing you here) were purchased, all three were Leviton, but each of the three were very different from each other. The first group was bought from Graybar and I had bought some backup ones from Home Depot, we had some problems with the Graybar ones working so we went to punch down into the Home Depot Levitons. My punch down tool would fracture the Home Depot biscuit Jack's they were completely worthless. Finally I went to an electric supply store and bought the final group of Leviton which were clearly Superior to even the Graybar ones a stick of butter would have been superior to the Home Depot ones.

[Tmurf]

So, as long as you know the configuration used throughout, it doesn't matter which configuration you use in any application, so long as the patch cable is the same on both ends and the outlet is the same on both ends. Wire a 568a to 568b on the same line, it makes a crossover said cable being wired 568a, used on a connection source wired 568b wouldn't change it's functionality in any possible application. After all, if the exact same wires are switched on both ends, they retain the same function....the wires don't know what color they are. I could wire my home electrical up backwards, with white being live, black as neutral and it wouldn't matter one bit, so long as the electric current still travels the same path through the outlets per usual.

[themafia]

What should I use for 4k and 8k multi room audio video?

[mohaglade]

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

[phillychannel]

Why use color-coding? The only question I have in mind: are there special feature between all the copper wires inside those color- coded plastic covers with regards to Transmit and Receive functions and vice versa? Are White-Blue not capable for Transmit+ and Blue not capable for Transmit- or the browns cable?

[kumaragruha]

I've read in several places that 568A is more common in residential settings. It may be because they served as voice lines as well. I heard that 568A is compatible with 2-line USOC and 568B is compatible only with 1-line voice connection. However, I hear you say that 568B is more common, which I find to be true since all the Cat 5e cords I have are of the 568B configuration. Lastly, I read that as long as the wiring in the house is consistent (say 568A), I can use a cord that is of 568B configuration. Please comment and let me know if I'm wrong.

[mcorz]

Come to find my rj45 wall sockets were terminated A. I already terminated the keystones in the network closet as B and the connection works. Should I re-terminate the keystones in the network closet as A?

[matijakukeckuky]

Good video but I was hoping that I will find the aswer for my question... If everything is the same and there is no any doffernece between A and B. Why do we have choice? There must be some differnece. Do you know... If you know please...

[bjornjoseph]

i learned B as the standard.. still use it... OW, O, GW, B, BW, G, BW B.. lol.. haven't wired in years but thats still stuck in my head

[gshan]

I had issues. I did T568B but pins 5 6 7 8 is not responding. Is that normal?

[connerp]

If one end of a cable is A and one is B would this limit download speeds?

[reubensoularie]

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 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.

[danielbenisti]

hey i 'm new in networking in general,
what the eia/tia means .
does 568a is straight through,
and 568b is crossover ?