Ethernet
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Ethernet


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DEFINITION - Ethernet is the most widely-installed local area network ( LAN) technology. Specified in a standard, IEEE 802.3, Ethernet was originally developed by Xerox from an earlier specification called Alohanet (for the Palo Alto Research Center Aloha network) and then developed further by Xerox, DEC, and Intel. An Ethernet LAN typically uses coaxial cable or special grades of twisted pair wires. Ethernet is also used in wireless LANs. The most commonly installed Ethernet systems are called 10BASE-T and provide transmission speeds up to 10 Mbps. Devices are connected to the cable and compete for access using a Carrier Sense Multiple Access with Collision Detection (CSMA/CD ) protocol.

Fast Ethernet or 100BASE-T provides transmission speeds up to 100 megabits per second and is typically used for LAN backbone systems, supporting workstations with 10BASE-T cards. Gigabit Ethernet provides an even higher level of backbone support at 1000 megabits per second (1 gigabit or 1 billion bits per second). 10-Gigabit Ethernet provides up to 10 billion bits per second.

Ethernet was named by Robert Metcalfe, one of its developers, for the passive substance called "luminiferous (light-transmitting) ether" that was once thought to pervade the universe, carrying light throughout. Ethernet was so- named to describe the way that cabling, also a passive medium, could similarly carry data everywhere throughout the network.

Getting started with Ethernet
To explore how Ethernet are used in the enterprise, here are some additional resources:
Optimization of the data center with 10 Gigabit Ethernet: Data center networking has taken advantage of 10 Gigabit Ethernet. Optimize your interconnection equipment and prevent latency with more efficient LAN technology.
Converged Enhanced Ethernet: New protocols enhance data center Ethernet: 10 Gigabit Ethernet performance in the data center is improving. Network traffic and packet loss issues are being solved with new, more efficient protocols.
Using Ethernet switches to build LANs: In this Q&A, a networking expert explains how one might use Ethernet switches to build a LAN and what to consider.
Gigabit Ethernet and 10 Gigabit Ethernet: Technology overview: This overview of Gigabit Ethernet and 10G lays the foundation for understanding Gigabit Ethernet technology and the advantages it brings to your network.

Learn more about Ethernet
100Base-(T) TX/T4/FX - Ethernet: Cabling tips for network professionals, lesson 5: 100Base-(T) TX/T4/FX - Ethernet cable specifications and uses are discussed in this tip.
Gigabit Ethernet and 10 Gigabit Ethernet: Technology overview: This overview of Gigabit Ethernet and 10G lays the foundation for understanding Gigabit Ethernet technology and the advantages it brings to your network.
Power over Ethernet Crash Course: Discover what Power over Ethernet is, how it works, and whether it's right for your network with these tips and resources.
Power over Ethernet podcast: This podcast discusses the emergence of PoE and its many benefits to enterprise networks. But is the technology ready yet for your network? Let's find out…
FastFacts on Power over Ethernet: Power up on Power over Ethernet with this edition of Networking FastFacts.

LAST UPDATED: 03 Aug 2009

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More resources from around the web:
- SearchNetworking.com also offers a long list of white papers about Ethernet and other network technologies.
- Test your knowledge with Quiz #28: Ethernet.
- Glossary-to-Go: Ethernet is in a handy, printable format.
- The IEEE 802.3 standard is available by direct order from the IEEE.





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