Cat 5 - A or B Standard?

[Paul Schmidt]

I am putting in a new wall plate for a Cat 5 cable run. I have put some
in before, but I never noticed that there was a choice between A or B
wiring configuration. The guide I have followed to make cables had me
making A type connectors. Since I make both ends identical, there hasn't
been any problems.

I would rather follow the correct standard, if there is one. Which one
is recommended, and why?

Paul

[Dale Noll]

568B is the standard for data connections.
568A is the standard for voice connections.

Electrically they are the same, the pair colors are different.

Why. Because they can.

Dale

[Paul Schmidt]

Thanks, since half of my house is wired to the 568A standard, I may as
well keep it uniform.

The pack of RJ-45 terminal ends that I have has the T568B listed as
AT&T, which would be opposite of what you said. It just gets more
confusing the deeper I look into it. I just want to finish the project.

Paul

[Tom]

At 02:55 PM 5/22/2012, you wrote:

I am putting in a new wall plate for a Cat 5 cable run. I have put some in before, but I never noticed that there was a choice between A or B wiring configuration. The guide I have followed to make cables had me making A type connectors. Since I make both ends identical, there hasn't been any problems.

I would rather follow the correct standard, if there is one. Which one is recommended, and why?

EIA/TIA 568-A or B, just pick one and use it everywhere. There's no real functional difference, only thing is, wiring a run or jumper with one end -A and the other -B creates a crossover cable. With most switches doing auto-MDIX, it's hard to justify making a crossover cable these days. On purpose, anyhow.

As long as you're consistent, it doesn't matter, especially in a home/SOHO setting.

Paul

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