Solved style a or b wiring?

July 18, 2012 at 02:26:06
Specs: Windows XP
when wiring patch panels and jacks which do i use a or b? which is the more standard for commercial installs?

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#1
July 18, 2012 at 02:34:39
✔ Best Answer
I believe there isn't a standard but as long as you stick with one. When I was working for a company with over 200 stores, we were in charge of security cameras, phones and computers/network. We'd see style A and B mixed up but as long as the ends are wired the same, we never had an issue.

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#2
July 18, 2012 at 05:48:53
Both A and B are the standards. The reason there are two and not just one is that when you're making a crossover cable, you do A at one end and B at the other. In the case of a 1000 Mbps cable, you swap all 4 pairs, not just the orange/green pairs.

It doesn't matter which you use, so long as you consistently use the same one throughout the install so that both ends are the same (A or B).

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#3
July 18, 2012 at 06:13:50
As has already been stated, it doesn't matter which standard (568A or 568B) you use, but the more common standard used in commercial installs is A, because that color coding also complies with 2 line phone wiring (2pr USOC).

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Related Solutions

#4
July 18, 2012 at 07:44:58
A is residencial
B is commercial

ANSI/TIA/EIA-568-B "Commercial Building Telecommunications Cabling Standard" lists both wiring configurations. T568B is the most prevalent for commercial installations, and was used by AT&T for the original Merlin phone systems. To help you remember, associate "B" with "Bell."

ANSI/TIA/EIA-570-B "Residential Telecommunications Cabling Standards" recommends T568A

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#5
July 18, 2012 at 08:01:31
FishMonger

Just FYI, the Blue pair will always be in the middle in both A or B as it's only the orange/green pairs that are changed between the two. So regardless of whether you use A or B, if your phone wiring is done correctly, you can plug an RJ-11 into an RJ-45 jack and hit the blue pair in the RJ-45.

We frequently use Cat5e/6 here at work for phones and in some cases, terminate to a BIX block with RJ-45's on them too. Then we can plug a phone into it if need be. This is handy for analog lines for say, fax machines.

We've also worked used this method in rooms with no phone lines that suddenly require one. To use a network cable, at the wiring closet end you simply use an RJ-11 in the patch panel and punch the other end into a BIX block.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#6
July 18, 2012 at 09:28:50
Curt,
You are correct about the blue pair, but you're also only considering a one line connection. When 2 lines are needed, then to stay within the color code standards, you should use A.

wanderer,
Both 568A & 568B are commercial, residential is 570B. It would probably be more correct to say 568 is commercial, because it includes 568A, 568B, and 568C.


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