Ethernet Straight-Through Cable pin configuration

CAT-5 straight-through pin configuration

Pin Function Wire Color
1 Transmit (+) White-Orange
2 Transmit (-) Orange
3 Receive (+) White-Green
4 -- Blue
5 -- White-Blue
6 Receive (-) Green
7 -- White-Brown
8 -- Brown

Above values are relative to the cable connector, not the NIC.

CAT-5 ethernet cable pin configuration

The TIA/EIA 568B straight through cable consists of four pairs of twisted pair lines. These ethernet cables can be shielded twisted pairs (STP); screened twisted pairs (ScTP); or most commonly, unshielded twisted pairs (UTP). The twisted pairs serve to cancel out the any RF/EM (radio-frequency/electromagnetic) noise through the lines.