RJ-45 interface signal definition

RJ-45 interface signal definition and network cable connection head signal arrangement

Ethernet 10/100Base-T interface:
Pin Name Description 
1 TX+ Tranceive Data+ (Send a signal+)
2 TX- Tranceive Data- (Send Signal-)
3 RX+ Receive Data+ (Signal Receive+)
4 n/c Not connected (empty foot)
5 n/c Not connected (empty foot)
6 RX- Receive Data- (Signal Receive-)
7 n/c Not connected (empty foot)
8 n/c Not connected (empty foot)

Ethernet 100Base-T4 interface:
Pin Name Description 
1 TX_D1+ Tranceive Data+ 
2 TX_D1- Tranceive Data- 
3 RX_D2+ Receive Data+ 
4 BI_D3+ Bi-directional Data+ 
5 BI_D3- Bi-directional Data- 
6 RX_D2- Receive Data- 
7 BI_D4+ Bi-directional Data+ 
8 BI_D4- Bi-directional Data- 

1 white/orange
2 orange/white
3 w/green
4 blue/w
5 w/blue
6 green/w
7 white/brown
8 brown/w 

The rj45 interface adopts a differential transmission method, tx+ and tx- are a pair of double-legged lines. Together, it can reduce interference. You can check the Ethernet standard IEEE802.3 article entry: aaadxmm      Editor: aaadxmm