I got tired of the debate and created my own pattern.

Brown, blue/white, green/white, blue, orange/white, green, orange, brown/white

Me too, 568C.

I guess all the people posting using B in a residential job, never use the structured wiring cans. OnQ, Open House, Leviton, etc... ALL!!! use A. I have never seen it otherwise.

I agree it's a pain in the butt to always have to look if the system you're using is wired A or B. But until these manufactures get thier crap together and pick 1 wiring scheme, we are going to have this confusion.
Pay attention to what your wiring and select A or B depending on what you're doing.

Yes, but I use pro RJ45 patch panels in larger homes and they are usually 'helpfully' (confusingly) identified with BOTH standards. It's always bugged me that the shade of colors used on the punch down blocks on the patch panels and often on the keystones is sometimes so poor that orange can look like brown and green like blue .......... Yeah, I know, get a better flashlight .......

Actually, I would think that using a or b could make a huge difference in some products depending on the twisted pair that is twisted the most. We have switched to B but always check to see what each product requests. I know that I tried to use a balun with A once and could not get it to work. The product did not mention anywhere that I needed to use b but once I made it B, It worked. Just for kicks I tried a again and tested everything. Didn't work. As far as Onq, I am pretty sure we used B on the last few jobs we did and had no issue. Sometimes it just does not matter. Sometimes it does.

I believe there's a slight difference in the twist rates between the orange and green pairs which is why some manufacturers recommend one over the other as they tuned their devices based on the slight differences in cable length.

As an installer, we used A for years because many punch devices were labelled with A on top. After a few manufacturers recommended B we switched to B and still deal with the occasional "one end A, one end B" problem :-)

If you're dealing with loose wires like the phone guys it is a bit more important.

The topic of twist rates came up a couple of years ago when it occurred to me that it one colored pair always has a higher twist rate than the others, then it would make sense to use that pair for higher frequency signals. I asked if all brands had the same relative twist rates.

After a lot of speculation here, Stephen Lampert of Belden jumped in to say that the spec did not say which colors should have which twist rate, and each manufacturer probably always did it their same way each time, but since it's not part of the spec, you can't trust that the twist rates will be the same from brand to brand.

Figures. In that case, Use c standard. To hell with all of them!

Canadian "A"

I always use "B" And this is why I think the key to success is having a install that new installers to the company can pick up quickly or feels natural . A few years ago I worked for a company That did A and we always had to remind the the new hires to not wire the rj45 for B . They would always say Im just so used to B because my last company did B.

I can't believe no one is wiring to the ELAN standard. I recall one of their instructors saying it pre-dated T568A/B.

I shouldn't have joked earlier. After reterminating a dozen keypad connections for élan keypads today, my helper turned around and screwed up ten patch cables by completely reversing the solids and stripes for a standard 568A end.

568WGAS

i use A because its what I have memorized lol. Works. See no need to change. Get a standard and stick to it. Of course, as others have said, check on anything existing.

[Link: en.wikipedia.org]

I have used B most of my career, phone guys like A. Seems like most modules nowadays are preconfigured in A to line up with phones.

And once again the only difference between A and B is the the pairs are swapped. It makes no difference with baluns or anything else!! If you have issues with A and you switch to B and it works that means you f$cked up your termination the 1st time.