This is an old version of Ethernet RJ45 connection wiring.
| Name | NIC1 | NIC2 | Name | 
|---|---|---|---|
| TX+ | 1 | 3 | RX+ | 
| TX- | 2 | 6 | RX- | 
| RX+ | 3 | 1 | TX+ | 
| RX- | 6 | 2 | TX- | 
Note 1: It´s important that each pair is kept as a pair. TX+ & TX- must be in the pair, and RX+ & RX- must together in another pair. (Just as the table above shows). Note 2: You could also connect 4-4, 5-5, 7-7, 8-8.

