T568A vs T568B - what's the difference and how to test patch leads.
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- Опубликовано: 8 сен 2024
- Networking patch cables and RJ45 connectors use two different colour codes. We take a look at the difference between T568A and T568B and how to visually identify the network colour code being used.
We also show how you can test an ethernet patch lead using the Patch App & Go tested featured in this earlier video. • Can this RJ45 continui...
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Great video Gaz 👍 very interesting and useful
Your little tester is fine but it can't possibly tell how a cable is wired. It will PASS any cable provided the four pairs are correctly wired.
eg It will pass an "A" cable even if you tell it that its a "B"
Great vid.
No need for crossovers anymore Not used one for nearly 20 years as network equipment is auto negotiate.
Never mix 568a with 568b.
Always use 568b in new installs.
Thanks for the information! ;)
Auto MDI-X is a wonderful thing
Sparkies doing data cabling often a recipe for disaster
Technically you are correct... only 2 pairs are used for 10 or 100 mbit networking. If you are at gigabit it uses all 4 pairs. 100mbit uses the unused pairs for PoE. Gigabit uses the same pairs but because ethernet uses differential signalling it still works. Also don't bother with cross over cables. Auto cross over (MDI/MDX) is part of the gigabit standard but many older but newer gigabit devices will swap around as required.
Glad to see your description of a crossover cable is exactly correct. They so many videos simply designate a 568b as a crossover cable. As you state a crossover cable must be type a on one end and type b on the other to affect a crossover of the signals. Thanks for getting it right.
Despite BT (and others) marketing their supplied devices as "Hubs", that's a specific term which relates to a particular type of networking hardware. A lot of people say "hub" when they actually mean something else. In this case the BT "home hub" shown is actually a Modem/Router.
It's also worth clarifying when you say it doesn't matter what T568 standard you use, that is as long as you choose the same on both ends of your cable.
Technically it's not a hub at all and a router with an integrated network switch. Hubs were used before network switches became standard. Hubs have not been used since the 90s
Switches learn where the hosts are connected
e.g. which host is attached to what port. while hubs were a dumb devices that would forward everything on each port
@@James-dv1df Not quite true. I have some 3 port hubs for 10T still in use for IoT.
@@adrianandrews2254 I meant more the switches within a router is not typically going to be a hub.
Not really deployed any IoT stuff however this is more of a niche use case and guessing old or something?
Great crossover video into networking
That was a perfect explanation. That helped me.
Great video. Answered all of my questions. I don't need to watch another video.
As a computer scientist I agree with the information in this video
Good video well explained but not sure why building a crossover cable all installs should be straight through as switches have had MDI-X for a long time.
Great video as usual, and exactly what I was looking!
I'm based in the US and I've only ever used the B method.
Also, it's a pricey little kit, but the RW Certifier is a great tool. I'm not exactly sure how I would feel having to use my phone when checking my cables.
Great video, thanks for sharing 👍
Pretty much everything does Auto MDI-X nowadays, so no real need for crossover cables any more. At work we also have a convention that all crossover cables are red.
Auto MDI-X was brought in with gigabit as part of the standard
We also use red for xovers 😀
As a Cisco network engineer i have seen instances where disabled on the network switches. I think it can avoid loops in the ethernet topology as you then can't hook a switch to a switch so easily however a property configured network should be running spanning tree so don't thinks it's a brilliant idea
@@jamesrose6751 we use yellow however have not used a crossover for a while
Found it very useful thanks, subscribed.
If you want a higher density patch panel without going all the way to a rack mount unit, you can get a '66 block' mounting for 8p8c/ethernet jacks. They will actually be 110 blocks but you can mount it to a wall the same way you mount a 66 block. I think it's like 10 ports.
I always do B, idk why but that's what's hardwired in my brain lol
Very handy vid 👍
This could be nonsense, but someone said the A was America and the B was Britain, I always use the B version
A for Australia 👍🏽
I'm in Australia, and use A 👍🏽
Crossover cables are still used in Industry devices to directly connect to a PC
Thanks for the insight
Gaz looks like he has a ponytail in the cover photo to click on. Its that "Fixx" squiggle logo behind his head which makes it look like this.
That's ok if you're happy with a max link speed of 100mbps. If you want a gigabit link speed, cross the other two pairs too.
So T568B would be G+w, G, O+w, Br+w, Br, O, B, B+w on the far side.
or move to fibre?
@@Mike_5 Moving to fibre requires significantly more skill and tools to terminate though. Then you also need more expensive equipment to connect to. Not a problem in a business environment but probably too expensive for a residential setting.
Just be clear you mean a cross over cable here? As others have said cross over cables are redundant these days as switches handle all the auto negotiation etc
@@customcreativesolutions9982 No, fiber optic. It doesn't offer any benefit though as ethernet can handle significant data rates. You'd be better off paying for a proffesional data cabling company doing the work and carrying out proper certification and testing of each cable/connection.
@@timearp8185 Sorry Tim that reply was meant for @Steve S
Have you got a link to that tester? That’s a nice bit ok kit👍
WHICH TESTER APP ARE U USING?
How can I identify if my jr45 jacks in my new home are set to T568A or T568B. I took a picture of one of them, but I can't tell anything from the picture. I ask this because I may have to re-do all of them (about 8 or 10) and I don't know how much spare ethernet cable I will have inside the wall. If it is not much, I have to be very careful when I wire the cables with a new and better jr45. Thank you.
It doesn't matter. Just rewire with "A" or "B" as you chose. As long as any given cable has the same at both ends it will work fine.
IDK but I have been using non-standard color coding when setting up LAN ang it's working well. I just made it sure that whatever the color combination on one end is also the same on the other end. Is there a special feature between the copper wire inside a Wh-Or, Or and the Wh-Gr, Gr plastic cover with regards to Transmit and Received function?
There are no requirements to use any colours at all . An [ethernet] "T" type LAN cable must have 4 PAIRS of wires. Pair 1 is 3 and 6, Pair 2 is 4 and 5, Pair 3 is 1 and 2 , Pair 4 is 7 and 8 of an RJ45 [originally RJ41] plug. This is an expansion of the original Bell telephone wiring standard for a 2 line connection.
How the cable is constructed and how the wires are identified is not part of the spec. but the electrical specification and performance is.
All four pairs are electrically identical.
568A and B do not a network cable make. They're just a convention.
I all ways made sure both ends had the same color code, workes fine..
Most nics will automatically adjust tx and rx, so xover is not really needed anymore
Around Canada, it seems to depend if you're a telecom guy or an electrician.
Electrician did the work, it's A.
Telecom tech did the work, it's B.
Crossovers in walls make me cross.
Just wondering why you didn't just show the Full 10/100/1000 Mbit crossover layout, so all crossovered
Auto MDI-X
Are you absolutely sure a 568b cross-over is the same as 568a straight ? I found something different on the internet.
You have misunderstood. A crossover is "A" on one end and "B" on the other.
Hello efixx. Can you please tell me how you were able to display your phone's screen on the main screen of the video? Or, can anyone else tell me how that can be done easily. Thank you very much.
Easy way is just to screen record your screen and drop in to the video in edit. - does this help?
@@efixx okay. That's what I do now. I thought maybe you knew of some new super cool way of doing it. Thank you very much for the reply
What are the t&c of the app? Or are we signing up for more data collection from yet more companies.
The app just needs Bluetooth no sign up etc
@@efixx thank you for the update, privacy should be important to everyone but it seems tech companies are staring to encroach beyond respectable means.
It seems people these days will happily give away their bank details to be hip and trendy.
And very few folks read the terms.
I sometimes wonder if putting video’s like this out there for all to see is hurting the trade or helping the trade. I prefer to see the knowledge passed on to others in the trade. So we can make a living from it.
No video like this will hurt your trade. It is for people who want to either learn more in their trade (although seems like you should already know something like this if you are in the trade), or it is for people who want the knowledge to do it themselves and nothing more. You can still prey upon those who think they don't have the self confidence to do this themselves.
@@lunchbox1553 In a world where i have to show people how to recover their itunes passwords, cabling RJ45 makes you a wizard. We're fine.
You do it so many times you can just do it on auto without even thinking when making a cat 5,6,7 or 8 soon 9
People rarely use A.
I was always under the belief that a was American and b was British. Have I believed this wrongly for years?
Not, the standards are derived from USA, both of them, however A is only recognised by US Govt they dont accept B type, I think its an AT&T design.
A is also the standard in regs for Australia, New Zealand, and a few other countries
Thanks for the insight
It’s Green and White everyone knows it’s Green and White
Or Green and Not Green
Type B might be the most common type of connection, but for any new installations, type A should be used. Type B is dominant in America because AT&T used it as standard.
Or use one of the six other permutations of pair colours. Who cares? Wire each cable at random if you want. As long as structured wiring is 4 pair non-crossover it makes no difference.
I have FRENCH Cat5e cable with completely different colours as defined by "Norme Francais" (NF). Also french conduit for data is geen not purple. Don't be so parochial.