Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




Connecting two computers directly, with a cable from one Ethernet card to another, requires the use of crossover cables. Connecting computers via a hub or switch or an all-in-one ADSL router requires straight-through cables.

In a little more detail, each Ethernet card has receiver (RX) and transmitter (TX) wires. Each computer's RX must connect to the other computer's TX, and vice versa. A crossover cable thus wires RX to TX and TX to RX so that the proper connections are made directly between two network cards. For a hub, switch, or router, the RX/TX exchange is already done within the device so only a straight-through cable is needed. Many single Ethernet ADSL modems have a reversed Ethernet port with RX and TX pre-crossed so that to connect it to a single computer you only need a straight-through cable, as with the usual devices, and not a crossover cable that one might come to expect. When connecting such a modem to a separate hub you will need to plug a straight-through cable from the modem into the uplink port of the hub which should allow for the crossed RX/TX.

Copyright © 1995-2006 [email protected]

  Published under the terms fo the GNU General Public License Design by Interspire