T568A/B RJ45 Wiring |
||||||
Pin |
T568A Pair |
T568B Pair |
Wire |
T568A Color |
T568B Color |
Pins on plug face (jack is reversed) |
1 |
3 |
2 |
tip |
|
|
|
2 |
3 |
2 |
ring |
|
|
|
3 |
2 |
3 |
tip |
|
|
|
4 |
1 |
1 |
ring |
|
|
|
5 |
1 |
1 |
tip |
|
|
|
6 |
2 |
3 |
ring |
|
|
|
7 |
4 |
4 |
tip |
|
|
|
8 |
4 |
4 |
ring |
|
|
|
Note that the only difference between T568A and T568B is that pairs 2 and 3
(orange and green) are swapped. Both standards wire the pins "straight
through", i.e., pins 1 through 8 on one end are connected to pins 1
through 8 on the other end. Also, the same sets of pins are paired in both
standards: pins 1 and 2 form a pair, as do 3 and 6, 4 and 5 and 7 and 8.
And although many cables implement some small electrical differences between
pairs, these effects are negligible, so cables wired to either standard are
interchangeable. UTP cables terminated according to T568A on one end and
T568B on the other end are known as Ethernet crossover cables.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Category 5 cable".
