Ethernet 10/100 base-T
01 Mar 1998
	
	
	thumb|right|240px|8P8C modular plug pin positioning

	RJ45 FEMALE CONNECTOR 
	
	
	8 pin RJ45 (8P8C) female connector at the network interface cards/hubs

	
	
	RJ45 MALE CONNECTOR 8 pin RJ45 (8P8C) male connector at the cables.

Ethernet 10base-T / 100base-TX pinout. Widely used in ethernet network devices. Same connector and pinout for both 10Base-T, 100Base-TX and 1000base-T.


Pin
Name
Description
TIA/EIA 568A
Pair
Wire
TIA/EIA 568B
Pair
Wire
1 
TX+ 
Tranceive Data+ 
	

white/green 
	
3
	
1
	

white/orange
	
2
	
1
2 
TX- 
Tranceive Data-
	

green 
	
3
	
2
	

orange
	
2
	
2
3 
RX+ 
Receive Data+ 
	

white/orange 
	
2
	
1
	

white/green
	
3
	
1
4 
n/c 

	

blue 
	
1
	
2
	

blue
	
1
	
2
5 
n/c 

	

white/blue 
	
1
	
1
	

white/blue
	
1
	
1
6 
RX- 
Receive Data- 
	

orange 
	
2
	
2
	

green
	
3
	
2
7 
n/c 

	

white/brown 
	
4
	
1
	

white/brown
	
4
	
1
8 
n/c 

	

brown 
	
4
	
2
	

brown
	
4
	
2


Notes

T568A and T568B are the two color codes used for wiring eight-position RJ45 modular plugs. Both are allowed under the ANSI/TIA/EIA wiring standards. The only difference between the two color codes is that the orange and green pairs are interchanged. T568A wiring pattern is recognized as the preferred wiring pattern for this standard because it provides backward compatibility to both one pair and two pair USOC wiring schemes. The T568B standard matches the older ATA&T 258A color code and is/was(?) the most widely used wiring scheme. It is also permitted by the ANSI/TIA/EIA standard, but it provides only a single pair backward compatibility to the USOC wiring scheme. The U.S. Government requires the use of the preferred T568A standard for wiring done under federal contracts.
Length of CAT5 cable runs should not exceed 100 meters.
TX and RX signals are swapped on Hub’s. Also, please note that it is very important that a single pair be used for pins 1 and 2; 3 and 6. If not, performance will degrade.



References
http://www.duxcw.com/faq/network/diff568ab.htm
http://www.zytrax.com/tech/layer_1/cables/tech_lan.htm


Category:Networking Connectors
Ethernet 10/100/1000 base-T Straight
 
Ethernet 10 base-T Crossover