atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring 568a configuration

Well maybe, but CAT5 wasn't even invented yet when those standards were developed. I believe CAT3 was the latest and greatest of the day. I believe there was a CAT1 and 2 but those predated the 568 standards.

-Hal

Cat 1 was the old JKT, 4 conductor (unpaired) station cable, known as "Quad". Four individual conductors, Green Red, Black and Yellow.

Cat 2 was like Cat 3 - Paired telephone cable, but with an almost negligible twist to the wires. When you opened the jacket the pairs practically fell apart into individual conductors. We used to instruct the young'uns to rip open the jacket and before removing it, tape the end of the cable. Then they would remove the jacket . Otherwise it might be too difficult to identify the actual pairs, especially in a high count cable.

Sam

I remember having CAT2 many, many years ago. When CAT3 came out I felt about it like I do CAT6 today.

-Hal

Oh, you're REALLY going to like Cat 7. Gag Here

Rcaman

-Hal

CAT7 is much better known in Europe than it is in the US. My question is...at what point does switching from copper to fiber become a no brainer for premise cabling

Looking at that, fiber has to be cheaper and easier.

-Hal

Devil's advocate here

We all know the colour code - blue, orange, green, brown,,, Let's terminate a four pair cable on an 8P/8C jack using 568B. The other end, being voice is terminated on BIX,, (or R66 blocks if you must ). Customer is using multi-line analog phones. Line one connects to blue pair, line two connects to green pair, line three connects to orange,, wait what? What happened to the colour code? Would that not make 568A the proper configuration?


We did a cabling job for a customer, who did not specify how he wanted things terminated. Finished the job using 568A and their "IT professional" made us come back and reterminate the whole project B because "none of my computers work. I have B patch cords and you cannot mix them." He then proceeded to Google network wiring standards while he was lecturing me. Just smiled and nodded, reterminated everything, and sent them a bill.


Also, the previous comment about "buy any patch cord and it will be 568B" is not accurate. I have a stack here from StarTech, Belden and various others including generic no name and they are probably a 50/50 split of A and B.

No. It would be USOC.

-Hal

Congratulations on having a client willing to pay you for fixing an "error" as they perceive it. I have trouble getting paid for work that was done right the first time.

I am a little confused about what you are saying. As long as you keep each phone line and each leg of an Ethernet connection on a single twisted pair, it should work. If you have split pairs, then you may have signal attenuation problems. Also if you did cross over the orange and green pair, most modern equipment will auto-sense that and still make the connection. So why wouldn't the computers work?

I have never seen a computer patch cable that was wired 568A at both ends, but it would still work. I would suspect that such a cable is not a computer patch cable but a telephone line cord which is not made with twisted pairs. These may not work with computers.