Category: Ethernet

Ethernet Pin outs for Cat5, Cat5e, and Cat6

RJ45 T568A connector

pins 4,5 = pair 1
pins 3,6 = pair 2
pins 1,2 = pair 3
pins 7,8 = pair 4

RJ45 T568B connector

pins 4,5 = pair 1
pins 1,2 = pair 2
pins 3,6 = pair 3
pins 7,8 = pair 4

Straight-through cable

pins 1-1,2-2,3-3,6-6 (T568A both ends, or T568B both ends)

Crossover cable

pins 1-3,2-6,3-1,6-2 (T568A one end, T568B the other end)