this post was submitted on 25 Sep 2026
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And now I will sing a traditional song of my people.
π§β¬,π§,π©β¬,π¦,π¦β¬,π©,π«β¬,π«.
My brain was like that's to many wires... Until I finally was like oh orange white ... One wire lol. Them everything fell into place.
Wasn't there a second configuration too?
Crossover, but it isnβt needed anymore since most modern devices can detect what they are connected to and adjust.
Well there was A and B and it's been long enough since I made any cable, I don't remember which one everyone uses and which one only weirdos use.
T568B is the one everyone uses while T568A is the odd one.
I don't get what's particularly bad about T568A though? I was told it's just plain worse than T568B for anything faster than gigabit and I swear I never saw any store bought cables using it.
The configuration has absolutely no bearing on performance. It is purely for standardization. Straight through cables work with either because it's literally just connecting the copper on either end. The difference between A and B is just flipping 2 pairs around although I forget which. Only 4 or 5 cables of 8 are even used to this day which is crazy.
There are 4 pairs of 2 wires, for 8 overall. They are all used, but the pairs are redundant. From what I understand, when you send a positive pulse on, say, the solid blue wire, you also send a negative pulse on the stripy blue and white wire. The twisted pairs should counteract any interference, but if it doesn't, the arrival of the bumps with opposite polarity should foolproof things a little.
Oh yeah it's called differential signalling.
I think it's something to do with the crosstalk between strands.
https://youtube.com/shorts/EsoLNh9POhE
The rest of the channel is pretty funny too
A or B, can't be bothered to look it up
B
OK so I just learned, like, last week that there are two standards. Why are there two standards? WTF?
(The context is I was turning an Ethernet cable into an EtherCAT cable, which is a stupid industrial standard where you only wire up pins 1, 2, 3, and 6, and then charge the end user 200 times more for the cable.)
There are two standards as it allows one to make a crossover cable. (Do B on one side and A on the other)
I also find crossover cables completely useless and refuse to own one less it gets mixed into the pile. Everyone has a router/switch, which negates the need completely.
Back at the beginning of ~~times~~ ethernet, you needed the crossover cables to connect routers to routers, switches to switches or end devices to end devices. They wouldn't work with the straight cables.
The standard still needs those cables to be crossover, but nowadays the port itself can detect what type of cable you connected, what type of cable it needs, and rewire itself to accept whatever you throw at it.
The same thing happens when you directly connect 2 PCs together without a switch in the middle. But the ports also adapt themselves and work it out.
You could also use a crossover cable, and your devices would figure it out too.
Interesting thanks for the explanation!