Solved

Strange CAT5 cabling

Posted on 2014-01-29
5
300 Views
Last Modified: 2014-02-02
Hey guys,

I saw this strange issue where a number of cables had been made and the wiring is unlike I have ever seen in all my time.

It is supposed to be a straight through cable and is seemingly working on server - switch communications. However, the green and blue pairs are switched.

It looks like this.

END A
1. orange/white
2. orange
3. green/white
4. blue
5. blue/white
6 green
7. brown/white
8. brown

END B
1. orange/white
2. orange
3. blue/white
4. green
5. green/white
6. blue
7. brown/white
8. brown

Now I know END A is your standard 568-B standard. But I have never seen END B before. It certainly isn't 568-A.
0
Comment
Question by:Gareth Gudger
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 15

Assisted Solution

by:David L. Hansen
David L. Hansen earned 125 total points
ID: 39818292
It's not a cross-over cable, nor is it a regular pinout.  Sometimes people will only need a couple pairs (like with phone) and they don't want to leave the other pairs out.  So you could end up with something like this, but only (I believe) if they didn't need all the pairs for their purposes.
0
 
LVL 44

Accepted Solution

by:
Darr247 earned 125 total points
ID: 39818368
Maybe the terminator has a blue-green vision deficiency anomaly?
Or they just got mixed up.

The cable won't work wired like that, unless Auto-MDIX on both ends manages to straighten it out somehow.
0
 
LVL 31

Author Comment

by:Gareth Gudger
ID: 39818914
That's what I am figuring. It is a server or PC on one end. But the Cisco Catalyst does support Auto-MDIX.
0
 
LVL 44

Expert Comment

by:Darr247
ID: 39819067
I've never seen a gigabit port/adapter that didn't support Auto-MDIX... I'm just not sure all Auto-MDIX impementations can do more than make a crossover cable into a straight through cable and vice-versa.
0
 
LVL 31

Author Closing Comment

by:Gareth Gudger
ID: 39828373
The mystery continues. I guess we will never know. Thanks for helping guys!
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Broadband over Power Lines Broadband over Power Lines is the technology of transmitting computer data through power lines. This method of connectivity allows the user to have access to the internet without having to rely on additional cables, suc…
If you’re like me and you like peace and quiet, saving money, and pretty lights, then this article is for you. For financial reasons, I buy all the Cisco equipment for my home lab second-hand. The first thing to wear out is usually one of the coo…
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…
Attackers love to prey on accounts that have privileges. Reducing privileged accounts and protecting privileged accounts therefore is paramount. Users, groups, and service accounts need to be protected to help protect the entire Active Directory …

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question