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

YES...but standards exist for a reason! That is why we have a color code for 25 pair cable! Imagine if everyone made up their own color code...how much work that would be when troubleshooting.

We'd just have to go back to toning everything out, that'd really mess with the CG's head.

Using 568B as the example for my question. I believe the orange pair (1-2) and the green pair (3-6) are different lengths and as I have understood they are different for a reason. Traffic traveling on one pair would not be able to syncronize with traffic traveling on the other pair since the 2 would never be running side by side trough the total distance of the cable.

No documents to verify with just overheard. :shrug:

AS said by everyone else, It will work, but it's just not RIGHT. :shrug:

Just look at the cable. The twists on the greens are tighter than the oranges hence the green is longer than the orange. It will work straight through with an old 10 MB hub but when you connect it to a true 10/100 switch it will fail intermittently.
Been there and done that one and don't want to go back! Sparky made a bunch of homemade patch cables that way. I scratched my head on that one for a while when I upgraded the customers servers and network switches.

</font><blockquote><font size="1" face="Verdana, Arial">quote:</font><hr /><font size="2" face="Verdana, Arial">Originally posted by CCSGINC:
<strong>How many have noticed that the Brown pair has the least twist? Anyone know why? :rofl:

By the way the twist was reduced for manufacturing reasons as the 4th pair was not used at the time except as a filler and buffer for signaling on the other pairs.

By the way VW let this old telecom guy know that yes it will work, but he is not following the standard that we all understand and use. Why would he want to be considered un-educated in the field he chose to work? I am not insulting I am just asking a question. I know if I was considered an "old telecom guy" I would expect to be treated as if I knew what the standards and codes were. I would also like to be respected and remembered for being the guy that always did the right thing.

...."old telecom guy"........ I resemble that remark.

Ed, please pass the box....Thank you.

Okay, back in the "day" IF you know what open wire is/was, you would drive down the road and watch just one wire. It would weave in and out, up and down between pins and cross arms.

Ever see an o'scope screen and see the sine wave go up and down?

The open wire was "phased" to match the "wave" of the power being used.

CAT cable is the same way.....matching the "wave". The combination of 568B matches the higher speeds better than the 568A.....or so I have heard.

Anyway it is as good of a story as any other!



Ed, here's your box....... :rofl:

I agree with everyone who has said, and I think we all agree, do it the right way. Don't be a knucklehead. Use the accepted standard. It will probably work better, its considerate of the tech coming in behind you to work on it, its the professional thing to do.

I have always been under the impression that the individual pairs were twisted at different rates to reduce crosstalk, ie, improve performance.

We're talking PATCH CORDS here, not JACKS. Jacks have circuit boards that route the traffic, 8P8C modular plugs do not.

It was my impression that he was just crimping 8P8C mod plugs on the end of cables.

If he was asking about wiring jacks/inserts then that is a different issue and I apologize for misunderstanding.

If I remember right, patch cords are still part of the horizontal link. The 568A or 568B standard should be used. IMHO making patch cords is a bad practice as well. It will never be as dependable as factory cords made of stranded pairs.