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Topic:
568a or b. what's everyone doing in residential
This thread has 58 replies. Displaying posts 16 through 30.
Post 16 made on Tuesday June 19, 2012 at 11:29
Fins
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I got tired of the debate and created my own pattern.

Brown, blue/white, green/white, blue, orange/white, green, orange, brown/white
Civil War reenactment is LARPing for people with no imagination.

Post 17 made on Tuesday June 19, 2012 at 11:38
Tom Ciaramitaro
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On June 19, 2012 at 11:29, Fins said...
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.
There is no truth anymore. Only assertions. The internet world has no interest in truth, only vindication for preconceived assumptions.
Post 18 made on Tuesday June 19, 2012 at 11:38
John Williams
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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.
Post 19 made on Tuesday June 19, 2012 at 12:17
senor-232
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On June 19, 2012 at 11:38, John Williams said...
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.

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 .......
Thank you for your considered response
Post 20 made on Tuesday June 19, 2012 at 12:34
NEZBO
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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.
Better days are ahead
onesourceinnovation.com
Better days are ahead
Post 21 made on Tuesday June 19, 2012 at 12:59
DistinctAV
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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.
Post 22 made on Tuesday June 19, 2012 at 13:10
Ernie Gilman
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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.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 23 made on Tuesday June 19, 2012 at 14:36
NEZBO
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On June 19, 2012 at 13:10, Ernie Gilman said...
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!
Better days are ahead
onesourceinnovation.com
Better days are ahead
Post 24 made on Tuesday June 19, 2012 at 22:37
KRAZYK
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Canadian "A"
KRAZYK

Things you own end up owning you!
Post 25 made on Tuesday June 19, 2012 at 22:51
brucewayne
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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.
brucewayne
Post 26 made on Tuesday June 19, 2012 at 23:03
PeterN
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I can't believe no one is wiring to the ELAN standard. I recall one of their instructors saying it pre-dated T568A/B.
Post 27 made on Tuesday June 19, 2012 at 23:09
Fins
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On June 19, 2012 at 23:03, PeterN said...
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.
Civil War reenactment is LARPing for people with no imagination.

Post 28 made on Tuesday June 19, 2012 at 23:21
Gman
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568WGAS
Post 29 made on Tuesday June 19, 2012 at 23:55
Ranger Home
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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.
Post 30 made on Wednesday June 20, 2012 at 00:17
roddymcg
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[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.
When good enough is not good enough.
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