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EIA T-568A and T-569B
We wire T-568B everywhere -- when IPv6 is at 80 percent penetration, we will re-examine the A standard.

Diagnosis tip
A block wired A, with a B far end will show this pattern:
12345678	B master
78145236	A end

Pin Number Designations for T568B
Color Codes for T568B
Pincolorpairname
1wh/or2TxData +
2or2TxData -
3wh/grn3RecvData+
4blu1
5wh/blu1
6grn3RecvData-
7wh/brn4
8brn4

Note that the odd pin numbers are always the white with stripe color. The wires connect to RJ-45 8-pin connectors as shown below:

RJ-45 wiring for Ethernet (T568B standard)

The wall jack may be wired in a different sequence because the wires are often crossed inside the jack. The jack should either come with a wiring diagram or at least designate pin numbers.

Note that the blue pair is on the center pins; this pair translates to the red/green pair for ordinary telephone lines, which is also in the center pair of an RJ-11. (green=wh/blu; red=blu)


from: http://www.johnscloset.net/wiring/


Crossover
Cable
Straight Through
Cable
RJ-45
PIN
RJ-45
PIN
RJ-45
PIN
RJ-45
PIN
1 Rx+ 3 Tx+ 1 Tx+ 1 Rc+
2 Rc- 6 Tx- 2 Tx- 2 Rc-
3 Tx+ 1 Rc+ 3 Rc+ 3 Tx+
6 Tx- 2 Rc- 6 Rc- 6 Tx-

Note: The standard connector view shown is color-coded for a straight thru cable


Category 5 wiring standards:

EIA/TIA 568A/568B and AT&T 258A define the wiring standards and allow for two different wiring color codes.

Pin #

Signal

EIA/TIA 568A

AT&T 258A, or EIA/TIA 568B

Ethernet 10BASE-T
100BASE-T

1

Transmit+

White/Green

White/Orange

X

2

Transmit-

Green/White
or Green

Orange/White
or Orange

X

3

Receive+

White/Orange

White/Green

X

4

N/A

Blue/White
or Blue

Blue/White
or Blue

Not used *

5

N/A

White/Blue

White/Blue

Not used *

6

Receive-

Orange/White
or Orange

Green/White
or Green

X

7

N/A

White/Brown

White/Brown

Not used *

8

N/A

Brown/White
or Brown

Brown/White
or Brown

Not used *



from: http://www.makeitsimple.com/how-to/dyi_crossover.htm

Crossover pattern

from: http://www.derose.net/steve/guides/wiring/CAT5crossover.jpg

T-568B pattern

from: http://www.johnscloset.net/wiring/RJ45.gif

Patch cable end colors

from: http://www.makeitsimple.com/how-to/rj45colors.gif


 
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 Modified: Fri, 16 Dec 2005 13:55:12 -0500
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http://herrold.com/ethernet/