Date: Sun, 28 Nov 2004 21:31:43 +1030 From: Ian Moore <imoore@picknowl.com.au> To: freebsd-questions@freebsd.org Cc: johne edw <johneedw@yahoo.co.uk> Subject: Re: rj-45 connector Message-ID: <200411282131.51002.imoore@picknowl.com.au> In-Reply-To: <20041128095501.82292.qmail@web25407.mail.ukl.yahoo.com> References: <20041128095501.82292.qmail@web25407.mail.ukl.yahoo.com>
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On Sun, 28 Nov 2004 20:25, johne edw wrote:
> dear sir,
> i've 3 computers and i want to connect them togather as a workgroup
> network via a hub. i know that the both ends of cable must have the same
> sequense of color .please advice me if that the color sequence of wires
> connected to rj-45 connector is important or not?..i mean, in another wor=
d,
> is there a special sequense of color ? or any sequense of color will be
> valid when the both ends have the same color sequense ? i wish that
> response will come on soon........best regards
>
This is rather OT, but...
Yes, the order is important, the cable will probably work at low speeds ove=
r=20
short distances as long as both ends are the same, but will be unreliable a=
t=20
high speeds or longer distances unless you follow the correct order.
Basically there are 2 standards, EIA/TIA-568A and EIA/TIA-568B.
In Australia & probably in Europe I suspect, the preferred standard is the =
A=20
standard. I think the US might use the B standard?
EIA/TIA-568A standard:
1 Green/White
2 Green
3 Orange/White
4 Blue
5 Blue/White
6 Orange
7 Brown/White
8 Brown
(see diagram below for pin numbers)
NB, the Blue pair is reversed - that's not a typo!
Both ends are wired up the same way, BUT, if you want to connect 2 network=
=20
cards directly together without a hub, you would need to use a crossover=20
cable which looks like the above on one end, but the other end is wired lik=
e=20
this:
1 Orange/White
2 Orange
3 Green/White
4 Blue
5 Blue/White
6 Green
7 Brown/White
8 Brown
Pin numbers are like this (looking at the connector with the tab underneath=
=20
and the cable coming from the left)
|---------------------------|
| ---- | 1
| ---- | 2
=2D------------------| ---- | 3
| ---- | 4
| ---- | 5
=2D------------------| ---- | 6
| ---- | 7
| ---- | 8
|---------------------------|
Hope that makes sense.
Cheers,
=2D-=20
Ian
GPG Key: http://homepages.picknowl.com.au/imoore/imoore.asc
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