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Ethernet 10/100/1000Base-T Straight Thru

Wiring scheme: EIA/TIA 568B

This cable will work with 10Base-T, 100Base-TX and 1000Base-T and is used to connect a network interface card to a hub or network outlet. These cables are sometimes called "whips".

Note: While 10BaseT and 100Base-TX only uses two pairs, please do connect all pairs since 1000BaseT uses all of them, and save yourself some future debugging :)

RJ45 FEMALE CONNECTOR (To network interface card).
RJ45 FEMALE CONNECTOR (To hub).

RJ45 MALE CONNECTOR to network interface card).
RJ45 MALE CONNECTOR to hub).

Name Pin Cable Color Pin Name
TX+ 1 White/Orange 1 TX+
TX- 2 Orange 2 TX-
RX+ 3 White/Green 3 RX+
  4 Blue 4  
  5 White/Blue 5  
RX- 6 Green 6 RX-
  7 White/Brown 7  
  8 Brown 8  

Note: 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).

Just for your information, this is how the pairs are named:

Pair Pins Common color
1 4 & 5 Blue
2 1 & 2 Orange
3 3 & 6 Green
4 7 & 8 Brown

The + side of each pair is called the "tip" and the - side is called the "ring", a reference to old telephone connectors.

Contributor: Joakim Ögren, Oscar Fernandez Sierra, Jeffrey R. Broido

Source:
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Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-07