Cable Standards

Hi,

It is my first question while I am studying and I hope it's not a stupid one.

Learning about Cat 5E cables and it talks about crimping your own, it says T568A and T568B can I ask what is the difference if any. He says on CBT Nuggets they are both standard and I wanted to know if there was a point to using one or the other.

Thanks

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Comments

Asif Dasl

TIA/EIA 568B is the standard pin layout. You would use both 568A & 568B when creating a crossover cable, and you would use a crossover cable when linking 2 switches together.

For the exam remember a crossover cable is used to connect like devices and a straight cable is used to link unlike devices like a switch (Layer 2) and a router (Layer 3).

I tend to remember 568B off the top of my head but have to look up 568A!

elderkai

The B colorcode is the one that's used the most and standard. Don't ask me why, though.

Priston

From my experience in the field most people use T568B over T568A.

I think T568A was designed more for phones since the two inner pairs of 568A are wired the same as a two-line phone jack.

Xyro

Welcome to the forum.

The only stupid question is the 1 that goes unasked.

Try this:
What's the Difference Between T568A and T568B?

pamccabe

Asif Dasl wrote: »

For the exam remember a crossover cable is used to connect like devices and a straight cable is used to link unlike devices like a switch (Layer 2) and a router (Layer 3).

I just want to clarify this because I was always told that for the exams you need to know Cisco's answers. After going through a few practice exams, I was burnt by this. Devices either transmit on wires 1 and 2, receive on 3 and 6, and other devices like hubs and switches transmit on pin 3 and 6, and receive on 1 and 2. So if you want to connect hubs together, or switches together, or go from a hub to a switch, you need a cross over cable. Now, devices like a computer NIC, routers, wireless access points, and network printers all transmit on 1 and 2, and receive on 3 and 6. Therefore, you would need to use a crossover cable to connect devices together like computers, routers, access points, and printers. That means that a PC to router connection needs a crossover cable. To connect the two different groups together, use a straight through cable.

d6bmg

T568B for straight cable layout.
T568B to T568A is the standard layout for crossover cable.

theodoxa

The orange/orange-white and green/green-white are reversed.

A: Green-White, Green, Orange-White, Blue, Blue-White, Orange, Brown-White, Brown
B: Orange-White, Orange, Green-White, Blue, Blue-White, Green, Brown-White, Brown

theodoxa

Asif Dasl wrote: »

TIA/EIA 568B is the standard pin layout. You would use both 568A & 568B when creating a crossover cable, and you would use a crossover cable when linking 2 switches together.

For the exam remember a crossover cable is used to connect like devices and a straight cable is used to link unlike devices like a switch (Layer 2) and a router (Layer 3).

I tend to remember 568B off the top of my head but have to look up 568A!

I also only remember B off the top of my head. But, the only difference between A and B is that you reverse the orange and green wires [and their striped counterparts]. So, figuring out A is just a matter of saying "Orange", but actually using "Green" or vice-versa.

neolight90

Sorry for slow reply been ill,

Thanks everyone for your great input