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Ethernet Connections 8-Wire vs 4 Wire

Home » Ethernet Connections 8-Wire vs 4 Wire

Abstract

This document describes how to connect Ethernet 4-wire and 8-wire connections to Galleon Equipment.

1.

Ethernet Cable Connections

1.1      Introduction

Inside the ethernet cable, there are 8 color-coded wires. These wires are twisted into 4 pairs of wires, for a Gigabit Ethernet connection and 2 pairs of wires for 10/100 Ethernet connections.

Each pair has a common color theme. One wire in the pair being a solid or primarily solid colored wire and the other being a primarily white wire with a colored stripe (Sometimes ethernet cables won’t have any color on the striped wire, the only way to tell which is to check which wire it is twisted around). Examples of the naming schemes used are: Orange (alternatively Orange/White) for the solid colored wire and White/Orange for the striped cable.

The twists are extremely important. They are there to counteract noise and interference. It is important to wire according to a standard to get proper performance from the Ethernet cable. The TIA/EIA-568-A specifies two wiring standards for an 8-position modular connector such as RJ45. The two wiring standards, T568A and T568B vary only in the arrangement of the colored pairs.

 

Pin Numbering
RJ45 Pin Numbering

1.2      Wiring Diagram

RJ45 Pin #Wire Color (T568A)Wire Diagram (T568A)10Base-T Signal 100Base-TX Signal1000Base-T Signal
1White/GreenTX+A+
2GreenTX-A-
3White/OrangeRX+B+
4BlueUnusedC+
5White/BlueUnusedC-
6OrangeRX-B-
7White/BrownUnusedD+
8BrownUnusedD-
RJ45 Pin #Wire Color (T568B)Wire Diagram (T568B)10Base-T Signal 100Base-TX Signal1000Base-T Signal
1White/OrangeTX+A+
2OrangeTX-A-
3White/GreenRX+B+
4BlueUnusedC+
5White/BlueUnusedC-
6GreenRX-B-
7White/BrownUnusedD+
8BrownUnusedD-

2.

Feedback and Sources

Any questions or comments to the contents are welcome and appreciated. Please contact Espen Bøch at eboch@galleonec.com or send your feedback to info@galleonec.com

Source: https://www.ertyu.org/steven_nikkel/ethernetcables.html