Very Computer

by **Thomas Forlenz** » Fri, 10 Sep 1999 04:00:00

What is the wireing diagram for running 100BT cables?
Can someone point me to the right documents.

I was informed that the pins need to be wired in a particular order for
the line to handle 100 megabit. Is this true?

--
- TPF http://www.eclipse.net/~tpf

"Ah! Hahahahahahahaha!"

by **David Coole** » Fri, 10 Sep 1999 04:00:00

> What is the wireing diagram for running 100BT cables?
> Can someone point me to the right documents.

> I was informed that the pins need to be wired in a particular order for
> the line to handle 100 megabit. Is this true?

You had your leg pulled... It's wired identically to 10baseT, bt you
have to ensure you run CAT5 cable to handle the bandwidth.

by **Eugene Blanchar** » Fri, 10 Sep 1999 04:00:00

> What is the wireing diagram for running 100BT cables?
> Can someone point me to the right documents.

Use EIA568A or B wiring standard for the color codes. I believe this is
EIA568B color code:

1st Twisted Pair Pins 1&2 Org/Wh Wh/Org
2nd Twisted Pair Pins 3&6 Grn/Wh Wh/Grn
3rd Twisted Pair Pins 4&5 Blu/Wh Wh/Blu
4th Twisted Pair Pins 7&8 Brn/Wh Wh/Brn

Pin 1 goes to 1, 2 to 2 and so on. The important part is the twist
pairs. Do not unravel more than 1/2" or you will degrade performance.
The reason for the strange pairing goes back to Token Ring which uses
pairs 3&6 and 4&5 to make RJ45 connectors capatible with RJ11.

Quote:> I was informed that the pins need to be wired in a particular order for
> the line to handle 100 megabit. Is this true?

> --
> - TPF http://www.eclipse.net/~tpf

> "Ah! Hahahahahahahaha!"

by **David** » Tue, 14 Sep 1999 04:00:00

>> What is the wireing diagram for running 100BT cables? Can someone
>> point me to the right documents.

> Use EIA568A or B wiring standard for the color codes. I believe this
> is EIA568B color code:

> 1st Twisted Pair Pins 1&2 Org/Wh Wh/Org
> 2nd Twisted Pair Pins 3&6 Grn/Wh Wh/Grn
> 3rd Twisted Pair Pins 4&5 Blu/Wh Wh/Blu
> 4th Twisted Pair Pins 7&8 Brn/Wh Wh/Brn

> Pin 1 goes to 1, 2 to 2 and so on. The important part is the twist
> pairs. Do not unravel more than 1/2" or you will degrade performance.
> The reason for the strange pairing goes back to Token Ring which uses
> pairs 3&6 and 4&5 to make RJ45 connectors capatible with RJ11.

The actual colors used for each pair isn't important. What is important
is that each pair (1/2, 3/6, 4/5, 7/8) has wires that are twisted
together. And that the pairs match up on both ends, of course.

Wires that are twisted together are usually indicated via their
insulation. Twisted pairs are the same color - one solid and one
striped. Or sometimes both stripped with different thicknesses. When I
make cables, I usually follow a pattern similar to what you describe:

1 - orange stripe
2 - orange
3 - green stripe
4 - blue
5 - blue stripe
6 - green
7 - brown stripe
8 - brown

-- David

Very Computer

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