sundance-communications.com/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring 568A/568B standard question

The real nitty gritty of this post is a history lesson.

I scan these comments, and Ken's name sticks as far as knowing your s....

The dumbing down in our trade or what was a craft
just don't exist.

A real craftsman knowns the theory of his trade,
totally, as he paid his dues by becoming a master.

Thats why every one is a TELECOM pro today (ha ha).
Yes, you can make your own patch cables yourself,
but do you known the proper way? No you cant because you dont understand what your doing, because you dont understand theory, ohms law,etc.
etc, etc.

Johnny the cg gets the job, because he is cheaper and Johnny the cg knows his stuff. (right).

Whom may i ask taught the CG his trade?

Life does go on no matter what if its right or
wrong.Pay me now or pay me later.

............and thats all i got to say....

Just a quick update on the wiring - 1&2, 3&6 is the Ethernet standard. Token Ring used 3&6, 4&5. TA Straight-through cord won't care what your internal wiring is, it'll just handle it.

The 568-A was the original wiring specified by the EIA/TIA committee dealing with creating the Structured Wiring Standard. AT&T looked at it and said something like "This is nice, but we have about a gazillion circuits out there (Dimension PBX) that use a slightly different wiring scheme -Our installers will get confused, so how about changing your standard to match ours?" When the committee said no, AT&T threatened to pull out of the deal. Rather than lose AT&T just as the standard was getting off the ground, the committee agreed to two separate but equal standards - the 568-A (approved) and the 568-B (alternate).

he 568-A was the original wiring specified by the EIA/TIA committee dealing with creating the Structured Wiring Standard. AT&T looked at it and said something like "This is nice, but we have ....


I really doesn't matter if you use the A or b standard. You can have a b wired jack on one end and an A wire patch panel on the other. The only difference would be changing the wht/or and wht/grn on either end.

One was USOC and the other was WECO. But the Weco B Standard is the most used termination.


I don't think the Committee was around 30 years ago. We called it Weco STANDARD BACK THEN..

Actually USOC is a completely different wiring Standard.

Also while the committee was not around 30 years ago neither was high speed data connectivity over UTP. I was around 40 years ago and we didn't use 4 pair jacks at all. I remember a 6 pair "modular" jack but it was either that, or 4 conductor or 25 pair.

And I was taught w/o and w/g pairs for data, w/bl for voice and w/br for later/power. Doesn't POE use w/br for power? John C.

POE uses pins 4-5 for positive and 7-8 for negative thus using all 4 pairs.

Actually USOC is a completely different wiring Standard.

It's not a completely different wiring standard.


Another Post:
I was around 40 years ago and we didn't use 4 pair jacks at all. I remember a 6 pair "modular" jack but it was either that, or 4 conductor or 25 pair..( best high speed we had was ethernet trunk?)oh, I guess

First get off get your ass off about the 658a or b standards

Go back to bed and sleep on it.

Technician II I.B.E.W. Local #58 Detroit, MI

Wonderfull I taught the class at 103 in Boston..

Gee wizz we need some guy's who can work on 1a2.

Kevin-MI, well there goes the best laid plans of EIA/TIA. I'd bet they use 2 pairs 'cause somebody complained that someone would turnover the power pair and smoke the equipment. Trying to make it stupid proof, I guess. SS, I can work on 1A2, but we don't have any at work, and it usually was put in places that were HOT in the summer and COLD in the winter, or HOT in the summer and the winter. 'Cause it would work there, unlike today's 'computerized' equipment. But, today's equipment needs reasonable temps, which I LOVE! John C.

Overall all it matters THAT THE PINS and pairs MATCHED,
1 568A IS PIN 1 --WH/GR
PIN 2 --GR/WH
PIN 3-- WH/OR
PIN 6-- OR/WH

T568b IS THE SAME BUTH THE REVERSING THE PAIR COLORS
PIN 1 -- WH/OR
PIN 2 -- OR/WH
PIN 3 --WH/GR
PIN 6 -- GR/WH

Pins 4&5 are the blue pair
Pins 7&8 are the brown pair on both A & b.