Welcome to Linux Knowledge Base and Tutorial
"The place where you learn linux"
HP & Linux

 Create an AccountHome | Submit News | Your Account  

Tutorial Menu
Linux Tutorial Home
Table of Contents
Up to --> Networking

· Network Technologies
· Ethernet
· Token-Ring
· ATM
· ISDN
· Network Hardware

Glossary
MoreInfo
Man Pages
Linux Topics
Test Your Knowledge

Site Menu
Site Map
FAQ
Copyright Info
Terms of Use
Privacy Info
Disclaimer
WorkBoard
Thanks
Donations
Advertising
Masthead / Impressum
Your Account

Communication
Feedback
Forums
Private Messages
Recommend Us
Surveys

Features
HOWTOs
News
News Archive
Submit News
Topics
User Articles
Web Links

Google
Google


The Web
linux-tutorial.info

Who's Online
There are currently, 193 guest(s) and 3 member(s) that are online.

You are an Anonymous user. You can register for free by clicking here

  
Linux Tutorial - Networking - Network Technologies - Ethernet
  Network Technologies ---- Token-Ring  


Ethernet

Linux supports two of the major network types: Ethernet and token-ring. Ethernet could be labeled as the great grand-father of all the other network types. It was developed in the 1970s by Xerox for linking computers to printers. Although not very wide spread at first, Ethernet has since expanded to be (perhaps) the most widely spread type of network.

The principle behind Ethernet is called Carrier Sensing, Multiple Access with Collision Detection (CSMA/CD). What this means is that every machine on the net sits quietly listening for messages. When one of the machines needs to talk, it waits for a pause and jumps in to send its message. What if two machines simultaneously see the pause and start to send? Well, a collision occurs. This is detected by both machine which wait a random amount of time before they will try again. Although the random amount of time could be the same for both machines, it doesn't happen too often and each machine eventually gets to send its message. The one that didn't get it's turn will see that the other one is talking and waits.

Because there is no guarantee that a specific machine will ever get a turn on the net, this type of mechanism is referred to as a probabilistic access system, since each machine will probably get access to the system someday. Keep in mind that the busier a network is, the greater the chance for collisions and the greater the likelihood that there will be more waiting. This does not mean that more machines mean more collisions. If I am sitting at my machine doing all of my work locally, then the traffic on the network cause by my machine is minimal. However, once I make a connection, the traffic increases.

Ethernet appears in several different forms, depending on it's physical characteristics. Primarily, these fall into the IEEE specification 802.3, with an average speed of 10MHz. One thing I need to point out is that the original specification developed at Xerox is not what most people think about when they think about Ethernet. Rather it is the IEEE 802.3 standard.

The most popular ways Ethernet appears is 10Base5 (Thicknet), 10Base2 (Thinnet) and 10Base-T (Twisted-Pair) and the 100-Mbit equivalents. The general format of these labels is StypeL, where S is the speed of the cable in megahertz, type is the transmission system, in this case baseband versus broadband and the L is the maximum length of the cable in 100 meters. I have also heard that the last number indicates the thickness of the cable in tenths of an inch. Thicknet, as one would guess, is thicker than thin net, but both are coax cable. Twisted pair is similar is format to normal phone cable, but may often have eight separate wires.

Often times, the topology (layout) of your network is dependent on what kind of cable you are using. Because it requires a central hub, twisted-pair is usually laid out in a star, with the hub at the center. This is a star topology. Thin- and thickwire are usually be spread out in a line, or linear topology. This is also called a bus topology.

 Previous Page
Network Technologies
  Back to Top
Table of Contents
Next Page 
Token-Ring


MoreInfo

Test Your Knowledge

User Comments:


You can only add comments if you are logged in.

Copyright 2002-2009 by James Mohr. Licensed under modified GNU Free Documentation License (Portions of this material originally published by Prentice Hall, Pearson Education, Inc). See here for details. All rights reserved.
  




Login
Nickname

Password

Security Code
Security Code
Type Security Code


Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.

Help if you can!


Amazon Wish List

Did You Know?
You can help in many different ways.


Friends



Tell a Friend About Us

Bookmark and Share



Web site powered by PHP-Nuke

Is this information useful? At the very least you can help by spreading the word to your favorite newsgroups, mailing lists and forums.
All logos and trademarks in this site are property of their respective owner. The comments are property of their posters. Articles are the property of their respective owners. Unless otherwise stated in the body of the article, article content (C) 1994-2013 by James Mohr. All rights reserved. The stylized page/paper, as well as the terms "The Linux Tutorial", "The Linux Server Tutorial", "The Linux Knowledge Base and Tutorial" and "The place where you learn Linux" are service marks of James Mohr. All rights reserved.
The Linux Knowledge Base and Tutorial may contain links to sites on the Internet, which are owned and operated by third parties. The Linux Tutorial is not responsible for the content of any such third-party site. By viewing/utilizing this web site, you have agreed to our disclaimer, terms of use and privacy policy. Use of automated download software ("harvesters") such as wget, httrack, etc. causes the site to quickly exceed its bandwidth limitation and are therefore expressly prohibited. For more details on this, take a look here

PHP-Nuke Copyright © 2004 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Page Generation: 0.10 Seconds