which wiring scheme should i be using when punching down network locations? What is the difference?

Thanks in advance Dean

Use A. It is the residential standard and will work for a network and for regular phones.

QQQ is correct. "B" is usually used in commercial applications (thing 'B' for business), but the reality is that either will work as long as the same configuration is used throughout the installation.

The difference is the way the green and orange pairs are terminated. In one, they're swapped, and in the other, they aren't. I don't have my chart in front of me to tell you which is which.

There's a bit of info available here from Leviton.

Larry
www.fineelectricco.com

IMO you should use "B". Im more of the techy, and B is what you will see all your patch cables made in. If you were to walk into a PC STORE and buy a cable, its crimped down in "B". Most patch panels come with a flip/flop insert, but again, B would be most likly used in your cross connectos, so why not keep it the same. When you certify your network (which im sure all you guys do) You will always know what pairs your on - And when you Certify you should always certify from one end of the PATCH CABLE to the other end of the CROSS CONNECT.

Whatever you decide to do, Make sure you continue to go with it on everthing.

CHART?? ...heh

1 = W/O
2 = O/W
3 = W/G
4 = B/W
5 = W/B
6 = G/W
7 = W/BR
8 = BR/W

Ohyea, A lil nifty thing to know. A basic 10/100 network only uses PINS 1,2,3,6 So if you had to, under extream circs you can frog the jack and run TWO PC connections over one peice of CAT5 by spliting up the pairs.

Also, if you were to make a CROSSOVER cable (for pc to pc communication) you would simple SWAP the PAIRS of 1,2 x 3,6 of ONE end of the cable.

This message was edited by Brijaws on 01/05/03 19:09.

It's not a big deal either way but the TIA/EIA 570A Residential Standard recommends that each telephone outlet will be an RJ45 T-568A jack. Your points are legitimate, but I think the tide has clearly turned and almost everyone I know does A for residential and I think that's a strong argument to follow the standard.

Dean, as you will see if you look at the following links, if you compare 568A (shown in the first link) to USOC 6x4 (typcially used for telephone jacks) shown in the second link, the color codes are identical. The point being that what people typically do now is wire all jacks with the 568A configuration and then it can be used for voice OR data and the wiring code is consistent.




p.s. Yes, Brijaws we do certify. We use HP Wirescope 350's.

O.K. I'm confused which scheme should I use? What do you mean by certify?

By the way the house in question has been punched down 568A

Thanks Dean

Use this one:



To certify means to use testing equipment that sends a signal through the completed network to make sure each line will carry the intended signal at at least the intended speed. Improper routing, bending, terminating, etc. can affect the data signal.

Larry
www.fineelectricco.com

...again, Whatever you use, be consistant.

If you are punching down VOICE jacks, i guess it doesnt matter. Like i said, Im not from the Alarm industry nor the phone company but i know alot of guys who are, and they have been taught to go with A. Networking and Computer installers would suport B.


The reality is that it doesnt matter. Howevere there are alot of IP porducts that are coming out now that have cables already attached which are crimped in B.

...SOO!!... use A? I mean B? Oh wait... nevermind...

Considering that either will work identically and jacks and patch panels usually offer your choice on their labeling the important thing is to make a choice and stick with it. It all started with Merlin(ATT) phone systems anyway.

I would use T568A This follows USOC on the first 2 pairs. This adds some benifit. But overall it don't matter. Patch panels can be bought in 568a or b.

Okay! And the correct answer is........."T568A". Yes, "A".
See the response by QQQ. The TIA/EIA 570A Residential Standard SPECIFIES T568A.
If I ever go on a job that somebody else started and I install an RJ45 jack or modular plug and it doesn't test right and I find out that the other end had been punched down with the "B" scheme then somebody must die!

As for the store bought patch cords being "B" - Who cares? all four pairs could be clear as far as I care! As long as it's a PATCH CORD (and not a cross-over) all of the wires will be going straight through from pin to pin.

Ya, I didn't quite get the point of that argument either.

You guys do what ever works best for you., God forbid you ever need to slice the end of a RJ45 onto a video convertor or somthing. Or maybe make a cross cable - Humm oh wait.. what would you ever do than???

Either way, doesnt matter. Some guys use Black and White, and Red and Green for there speaker hookups also... Whatever floats yer boat.

Clear is a good idea... Idiot!

Boy, you are a little bit arrogant aren't you. Do you think everyone here are a bunch of gorillas? Make a cross connect cable? Is that rocket science?

Ever hear of the word facetious? That's what David was being. But I won't call you a name for failing to perceive that.

QQQ did you even read Davids post?

LOL, ya, and im the guy who is arrogant. As in the begining of my message - DO WHAT EVER YOU WORKS BEST FOR YOU!

Ever guy has a differnt background and a differnt view. Mine view is for the B - leave it at that.