User:Reverend Loki/test

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[edit] Wiring

See modular connector for numbering of the pins in these 8P8C modular connectors.

The assignments of wire pairs to plug and jack pins are as follows:

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	white/green stripe	white/orange stripe
2	3	2	ring	green solid	orange solid
3	2	3	tip	white/orange stripe	white/green stripe
4	1	1	ring	blue solid	blue solid
5	1	1	tip	white/blue stripe	white/blue stripe
6	2	3	ring	orange solid	green solid
7	4	4	tip	white/brown stripe	white/brown stripe
8	4	4	ring	brown solid	brown solid

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. The different pairs in an ethernet wire have different impedances, so an orange pair can not be connected directly to a green pair. In order to connect two different pairs together, a hub or switch or higher level piece of equipment like a router must be placed between the two. Splicing two cables together will result in improper termination and reflections will occur in the line. These reflections will cause errors and lower the available throughput in the wire.

UTP cables terminated according to T568A on one end and T568B on the other end are known as Ethernet crossover cables.