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Gigabit Crossover?

Posted on 2002-07-17
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Hi,

I was wondering whether it is possible to connect two machines via gigabit without using a switch? I am unable to find any CAT6 crossover cables, and was wondering how to do it. I am using Intel 82544E1 cards, do they have functionality to detect and do a hardware crossover internally?

Help.

Phil
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Question by:Phil_Whittaker
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by:scraig84
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With fiber Gigabit its obviously really simple since you have an "in" and "out" connector on both sides.  Assuming we are talking copper gigabit and the fact that I know of few cards that will internally cross, you can create a x-over cable.  You still cross 1-3 and 2-6.  You also need to cross 4-7 and 5-8.  Note that copper is even more picky about the amount of twists per inch etc, so you need to make sure you are not stripping the outer sheath too far back.  You should strip only what is absolutely necessary to get the wires back to the pins of the plug.

Hope that helps.
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by:Phil_Whittaker
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Yes, I am concerned about it being picky, can not afford to have anything go wrong. So ideally I was looking for an existing pre-made/configured solution.

Cheers,

Phil
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scraig84 earned 200 total points
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I just checked at www.comark.com (I am required to buy patch cables from them typically) and they did have this part:

A3X189-01-RED-S

It is a Gigabit cross-over, but it is only 1 foot long.  It is also a special order from Belkin, which is a major cable manufacturer.  You may want to just call them direct.  Go to http://www.belkin.com/contactus/

Otherwise, I would just search around the web to find cable suppliers.  Another company I have had some luck with in the past is http://www.customcable.com/Contact-CCI/

Hope that helps!
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by:edmonds_robert
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If you need more length than just the one foot, buy a CAT6 coupler, attach the crossover cable to one machine, then to the coupler and then to a straight through cable to the other machine.  Voila, a crossover cable as long as you need.  And yes, generally adding a coupler is not a great idea, but I am assuming since you want to hook two machines together without a switch that they are not too far apart, so this shouldn't cause you any problems (if that is indeed the case).  
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Phil_Whittaker:
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No comment has been added lately, so it's time to clean up this TA.
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