Re: OT Any web site that teaches how to make LAN cable connection
Even that is incorrect. The pins that ethernet uses with RJ45 is 1/2
and 3/6, not 3/5 or 4/6.
Straight Through:
One End: Other End:
1 -> 1
2 -> 2
3 -> 3
6 -> 6
Null Cable
One End: Other End:
1 -> 2
2 -> 1
3 -> 6
6 -> 3
And if you really want to be thorough then on the straight through
4 -> 4, 5 -> 5, 7 -> 7, 8 -> 8
and on the null cable 4 -> 5, 5 -> 4, 7 -> 8, 8 -> 7
vec
----- Original Message -----
From: "Mike Dresser" <mdresser_l@windsormachine.com>
To: "Elizabeth Barham" <soggytrousers@yahoo.com>; <fasi_74@yahoo.com>
Cc: "list debaun" <debian-user@lists.debian.org>
Sent: Wednesday, March 27, 2002 9:44 AM
Subject: Re: OT Any web site that teaches how to make LAN cable
connection
> > There's straight-thru and crossover - for crossover, they should
be
> > reversed. If the original is BLUE-RED-GOLD then the matching one
> > should be GOLD-RED-BLUE (example is for explanatory purposes
only).
> > Straight-thru is literally that ; the wire on both ends should
look the
> > *exact* same through the RJ-45.
> >
> > Straight-Thru:
> >
> > 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
> > (bottom) (bottom)
> >
> > Cross Over:
> > 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1
> > (bottom) (bottom)
> >
> > Elizabeth
>
> Please don't follow either of these wiring diagrams.
>
> It's very important that pin 3/5(or 4/6, depending on how you look
at it)
> are swapped on both ends.
>
> You want: (T-568A)
>
> White/green, green, white/orange, blue, white/blue, orange,
white/brown,
> brown
>
> Sometimes you'll see (T-568B, preferrred for new installations)
>
> White/Orange, Orange, White/Green, Blue, White/Blue, Green,
White/Brown,
> Brown.
>
> Both will work the same.
>
> For crossover:
>
> Do above, one side the orange/blue/green/brown setup, and the other
side
> the green/blue/orange/brown setup.
>
> If you don't swap the 3/5(4/6) pins, your cable will might work, but
> you'll get massive crosstalk, especially over distance or in an
> electrically noisy environment.
>
> Please see:
>
> http://www.escape.ca/~droopy/ethernetcables.html
> http://www.incentre.net/incentre/frame/ethernet.html
>
> Also, see:
>
>
http://catalog.belkin.com/IWCatSectionView.processs?IWAction=Load&Merc
hant_ID=&Section_Id=522
> http://www.startech.com/cable/networking.htm
>
> Because that's a LOT easier and more reliable way to do it! If you
> are making your own cables, proper cable testers cost far too much
money.
> I make do with an old Fluke 620, but it isn't rated for 100mbit or
> gigabit.
>
> Hope this helps,
> Mike Dresser
>
>
> --
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