Solved

Cabling Question

Posted on 2002-06-26
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Last Modified: 2013-11-09
I have some Cat5e cable that I am connecting to a hub
and I put on the RJ45 connectors, but I can't seem to get
a connection. When going from a workstation to a hub do you
need to use a crossover cable or a patch cable?
I put the wires going from left to right with the clicky
thing facing down: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown. Any suggestions?

Thanks in advance

Mark Ritter
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Question by:mbr2
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LVL 32

Expert Comment

by:jhance
ID: 7111441
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Expert Comment

by:nickSURVICE
ID: 7111530
When going from a workstation to a hub a patch cable is used.  If you are directly conneting devices (i.e computer to computer, computer to printer, etc.) the crossover cable is needed.  Your problem seems to be in the connections.  Chech to ensure that the crimping tool works properly.  This can easily be done by using a voltage meter and contacting the like wires (on the connectors) at each end of the cable.  I've run into problems before where the crimping tool pinched the plastic on the plug and corrupted one of the pin connections
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Expert Comment

by:jhance
ID: 7111572
Moderator, please "welcome" this "expert".
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Expert Comment

by:Mindphaser
ID: 7111583
nickSURVICE  welcome to EE.

We usually write a comment instead of an answer, so the question won't be locked and other experts have the chance to give their opinions, too. Only if you are 150% sure that you have the right answer, we would post it as an answer. Please take a look http://www.experts-exchange.com/jsp/cmtyQuestAnswer.jsp for more information on how to answer questions.

For now I rejected your proposed answer.

** Mindphaser - Community Support Moderator **
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Expert Comment

by:nickSURVICE
ID: 7111603
Thanks for the info
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Author Comment

by:mbr2
ID: 7111671
jhance,

I noticed on the link you sent me that the ends of the
twisted pair are inserted with the "plastic sheating"
still on. I thought that you needed to strip the ends
to have some copper exposed before crimping. Am I wrong?

Thanks for the help.

Mark
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Accepted Solution

by:
jhance earned 100 total points
ID: 7111692
No, you do NOT strip the insulation off.  The connectors have "spikes" that pierce the insulation and make contact with the wires.  In fact, if you strip, things are likely not to work right since the insulation needed for proper mechanical fit.

Hopefully you have a proper crimping tool.  If not, get one.  They're inexpensive and you just can't do it right without one.

0
 
LVL 23

Expert Comment

by:slink9
ID: 7113276
If you don't have a crimping tool, go to your local Staples store.  You can get one for about $15.  You may also want to invest in a testing meter.  It costs $10-$15 and has lights on it to show you that your cable is correct before you put it in the ceiling.
0
 

Expert Comment

by:ccexch
ID: 7118566
Before going through a lot of gyrations on the cable let's make sure that it is indeed the problem. Can you swap in a known-to-be-good patch cable and see if the problem still exists?

If it IS the cable, a new commercial one costs as little as two or three dollars, depending on length, and is probably cheaper than the time.
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LVL 3

Expert Comment

by:StormMajik
ID: 7122094
A point to note: some combo cards ( I would think older ones ) that is a card with bnc and rj45 try an detect - on boot - the type of connection being used, if they do not find a good one they default to bnc. If you have a cable fault on your rj45/cat5 and you fix it you will never know until you reboot.

If it is not already said a patch cable is used between hub ( or switch ) to the computer - both ends are wired exactly the same on a patch cable.

A cross over cable is often used to connect a hub to another hub. Although a hub often has a cross-over switch that allow a normal patch cable to do the job, this is normally port 1 or the last port. The down side of this switch is if you have a computer attached and you press this button or flip this switch your computer will not be able to connect if in those ports.

The nice thing about a cross-over cable is it can be a poor mans two port hub, you can connect two PC directly with it, fogetting the hub all together. The ends are wired diffrently, pairs 3 & 6 are reversed in one end.

Use jhance's link for a cable diagram or my girlfriends site here:

http://www.virtualsara.demon.co.uk/network-faq4.htm

This explains step-by-step how to make a cable as well as the diagram of crossed and uncrossed connections.

Storm :-)
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Author Comment

by:mbr2
ID: 7123296
jhance,

Sorry it took so long to award the points. I got the cable
working and just forgot.

Thanks,

Mark

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