Difference between 568a or 568b Network Wiring
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- เผยแพร่เมื่อ 11 ก.ย. 2024
- 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 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!
l i just started started learning and installing cable. good video to compare and reference from.
Read my opinion of Leviton above
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.
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.
+bennettste yes, mostly 568B here too. I am not sure what the reason they developed 568a. It’s certainly no faster. 🤔
EIA/TIA-568A was released by EIA/TIA as general standard , 568A is used by most telecoms in the US and is US Military standard. 568A is most Common in Europe.
568B was later adopted from AT&Ts proprietary standard 258A.
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.
Great info just starting and thanks for TH-cam makes running my home network a little easier.
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!
+Jeff Moss you had a punch tool in your hands at 12??!! Wow! I didn't start pulling cable until I was 22.
Thanks for the comments Josh. Always good to hear from you.
DIY Telecom my dad went to work as General Counsel for a communications company when I was 12, he told me to work with him one day and I learned the entire industry from the ground up over approximately 10 years. Anytime I had a day off school I was working there. Phone systems got me interested in IT and I guess the rest is history :)
@ Jeff Moss - That sounds exactly like me! I was obsessed with Telephones since I was probly abt 5 years old lol I wish I would have followed my passion early on like you did. I guess better late than never though :) Do you happen to know any online classes off hand? I want to learn more on Networking and configuring Hosted VoIP systems. I was thinking about UDEMY.....which I have learn a lot there and youtube but was thinking there has to be something online instead of going to classes and spending several years going to college part-time....Look forward to hearing for you whenever you get a chance! ;)
Pete Zito sorry I'm not familiar with that site. Most of all I learned was either in the field or through the Sundance tech talk forums
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.
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.
hey Great comments! Yeah, I don't mean to talk trash about any brand in this forum, but let's say "I've not had consistent experience with the datacom products from Home Depot". Leviton is, in my mind, the gold standard. Graybar is OK (Allentel, I believe).
Thanks for sharing your thoughts. It helps us all be better techs! :-)
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 cable.....but 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.
Right. As long as the pattern is the same on both ends. But the 568a and 568b wiring patterns are industry standard and also helps with noise resistance.
Excellent job
Thank you for the feedback Brician. Always helps to know if the videos are hitting the mark. :-)
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
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.
Hello did you ever test this? I have my ports cabled type A, but the network work cables are type b
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?
Legacy compatibility and noise suppression.
What should I use for 4k and 8k multi room audio video?
can you make a video about the colors inside the blocks to recognize wich line im working on
He just did.
very useful thank you for that video
Glad you found it helpful Joseph. Thanks for the comment! :-D
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...
The wiring patterns (568A and 568B) have their roots in some very old Telephone Network design. 568B is way more common. However, I don't have a good answer as to why one would be better than the other. I've tried looking up a few time and it was inconclusive.
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?
there's a lot of auto-sensing going on these days. i.e. the network equipment figures out the pairs.
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.
The jack has a circuit board inside it that puts the pins inside the jack in the correct order for B
When I am installing new cat5 cables into a room at home that never had one I usually just lease the length I need and just buy a cat5e cable with the connectors already on at both ends. The cable could 25ft, 50, 100ft. Ethernet cable limit is 228ft.
When you buy the connector to go into the wall plate instead of the connectors that have to be wired, just buy the connectors that are adapter couplers. The connector snaps into the wall plate you plug your long haul cable that remains in the wall into the back side of wall plate. The front side will have the RJ45 opening for a jumper cable to get to your laptop or whatever. The other end of the long cable can be connected into your network panel if you have one or just plug directly into your router/switch etc.
WO+O, WG+Blue,WBlue+G, WBr+Br: 568b
Greenpair+blue+orange+brown: 568a
👍👍👍
I had issues. I did T568B but pins 5 6 7 8 is not responding. Is that normal?
Cat5e only used 2 pairs. Sometimes we would that those 4 pairs and split them so we would have 2 data jacks instead of one.
Very high speed data may require all 4 pairs like in video systems. Splitting the cable pairs could cause data cross over interference noise. We didn't it when it was going to be very expensive to install a hole new cat5 cable thru concrete walls etc.
hey i 'm new in networking in general ,
what the eia/tia means .
does 568a is straight through ,
and 568b is crossover ?
A cross over is needed when you would be connecting 2 of the same type of hardware together, like modem to modem.
EIA could be the Electronics Industry Association. and TIA probably the Telecommunication Industry Association.
My brain just can't comprehend this - A house with Type A wiring, yet you can get away with plugging in a regular common type b cable. Can you explain that? I mean I get that it will work, I just don't understand how lol
If one end of a cable is A and one is B would this limit download speeds?
technically speaking, if one end is A-style and the other is B-style, then what you have created is a "cross-over cable". And, for most newer switching equipment with auto-sensing, should still carry Ethernet traffic. And no, it would not affect the speed.
Interesting question. Thanks for posting. :-)
@@DIYTelecom Sometimes in a commercial application large scale network where cat5e is connected between multiple closets and patch panels sometimes the A's and B's may get mixed together. Sometimes from point A and B end the wiring comes out correct if not you just have to switch those 2 pairs around to make it correct.
Why is "B" more common?
What I understand is that in the B standard, the transmitting pairs have more space in between than while in the cable. That is one of the reasons cat6 have that cross inside it putting each pair separated from each other. When you use B, the transmitting pairs are opposite of each other, therefore having less electromagnetic interference.
A good way to remember is B for "Business" and A for "Analog".
Analog because if you get a cable with RJ45 568A and an RJ11 on the opposite ends, the RJ11 will end up in the middle of the RJ45, therefore compatible with analogue.
@@cabelodomato Thank you for that thorough explanation. That makes sense why B is more commonly used.
What’s kind of interesting, to my mind, is that some of these wiring standards go way back to times when Ethernet wasn’t all that common. Thanks adding to the conversation. 😊