atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Cabling Telephones Systems Wiring 568A vs. 568B

Aah, but it does matter. If you terminate in pair order, you have lost the twist on pair 3/6. Might be okay for 10baseT. Could slow down 100 because the unused conductors are not grounded and may actually bring in noise now on pins 3 and 6.

If you are doing PoE or gigabit ethernet, you are using all pairs and now they are no longer paired up correctly. Again, may cause noise and may cause bad test results on a verifier.

I have seen patch cables made like that a few times. Usually if the NIC and the switch are both 10/100, they won't even negotiate a speed with that cable in the link. Slows things right down to zero.

I never use data jacks for voice its a big waste
and you are asking for trouble sure enough some
one will plug a workstation patch cord into it and throw
a dead short across the data pair have had a whole system crash in the past like that (jacks were already in place 568a bt the EC)and have never used data jacks for voice again I put 2 usoc rj 14's on instead.

In Oregon mostly 568B and NO BIX.

Aah, but it does matter. If you terminate in pair order...

Don't think anybody here is advocating splitting the pairs. As long as pins 1&2, 3&6, 4&5 and 7&8 are on pairs it won't matter what colors you use.

-Hal

I always check out what type of hardware is being used at the customer sites I visit. Mostly 110, data jacks and 66 blocks. Some BIX, but not a whole lot.

Verizon New England has gone Krone krazy. They tend to use Krones for new demarcs as opposed to the old familiar RJ-21X.

In our Central Office, all wiring is 568B, so I tend to stick with it for any wiring job I do (work related or personal). I've pretty much given up on making patch cords and now use pre-mades whenever possible.

568B everywhere here.

unless, it's sparky

Sparky is the only one that uses 568A around here.

It's a wiring standard, like any standard it's meant to make it easy to follow the person before and make it easy on the person after. Same thing can be said about the color code, you can splice any color to any color as long as you do the same thing on the other end. Back in the old days we had people that would purposely change wiring on 1A stuff for "job security", dumb then dumb now.

Chad..I'll stick my neck out. Terminate your jacks and your patch panel 568B. If you purchase patch cords they will work perfect even if they have 8 colors of wires in them we have never seen. Chartruse..Jasmine or Black it don't matter as long as they are in the same order on both ends.

My mentor in this business taught me long ago that electricity is color blind. In fact it is completely blind. It follows a path. In this case a copper path. The color code is what humans use to create the desired path.

Just a tidbit of info. If you ever need a crossover cable. It will be 568A on one end and 568B on the other.

I can vouch for how bad a custom wiring job can be for the person after.

During one of our mergers, we inherited a POP site in Manchester NH. The site had a dead Stromberg switch, several muxes, DSX panels and a Tellabs 1/0 DCS.

The "nice" technicians (who quit right after the merger) had about 50% of the jacks on the various DSX panels wired "bass ackwards" with transmits & receives flipped. There was just about "0" documentation

It was so bad that my boss traveled from Boston to Manchester every day for 1 week trying to document how stuff was wired.

Needless to say that traffic was migrated out of that site very quickly.