Communication over Cat5e

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 Question by Paul Maher posted 08 Feb 2005
 Communication over Cat5e
I made a cat5e cable to run from a pc to a router and the cable tests good (I have a tester) but it will not allow communication. I made a shorter cable, and moved the computer next to the router, and it worked fine, it also tested good. I replaced the RJ45 connectors a few times trying to resolve the issue but to no avail (every time they tested good). What is the problem here?>????????? Paul
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 Answer by Joseph Golan posted 13 Feb 2005
Dear Paul,

I suspect that the cable you made up may have split pairs. When you said you tested it, I will assume that it just shows continuety from pin to pin. A category 5e cable is more then that, not only must it have continuity on the pins but the pairs of the cable must be on the proper pins to insure canceling of crosstalk. Look at the information here on this site. Click on the resources|references|pin layouts above to see the proper pairing of the pins. For 100BaseT pairs 2 & 3 are the active ones and pairs must be pins 1 & 2 and 3 & 6. If you see that this is the problem, reterminate the cable per the pair layouts and then retest for continuity


Sincerely,
Joseph Golan, RCDD

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