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Topic: Ethernet

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  Ethernet - Wikipedia, the free encyclopedia
Ethernet was originally based on the idea of computers communicating over a shared coaxial cable acting as a broadcast transmission medium.
The Ethernet Version 2 or Ethernet II frame, the so-called DIX frame (named after DEC, Intel, and Xerox); this is the most common today, as it is often used directly by the Internet Protocol.
Ethernet was originally developed as one of the many pioneering projects at Xerox PARC.
en.wikipedia.org /wiki/Ethernet   (4595 words)

Since short Ethernet frames must be padded with zeros to a length of 64 bytes, each of these higher level protocols required either a larger minimum message size or an internal length field that can be used to distinguish data from padding.
Any Ethernet packet with a type/length field less than 1500 is in 802.3 format (with a length) while any packet in which the field value is greater than 1500 must be in DIX format (with a type).
Ethernet is supposed to be a single common medium with multiple connections.
www.yale.edu /pclt/COMM/ETHER.HTM   (3470 words)

 Ethernet, Fast Ethernet, Gigabit Ethernet   (Site not responding. Last check: 2007-10-22)
Ethernet versions 1.0 and 2.0 followed until the IEEE 802.3 committee re-jigged the Ethernet II packet to form the Ethernet 802.3 packet.
Ethernet 1.0 did not have this in its standard and 802.3 says that repeaters must not connect to a transceiver that generates the SQE test because of the Jam signal that is designed to prevent redundant collisions from occurring.
Ethernet relies on electrical signalling to determine whether or not to send data, so a faulty card could stop all traffic on a network as it sends false signals causing other devices to think that the network is busy.
www.rhyshaden.com /ethernet.htm   (13057 words)

 Ethernet   (Site not responding. Last check: 2007-10-22)
This type of ethernet is subject to the 5-4-3 rule meaning there can be 5 network segments with 4 repeaters, and three of the segments can be connected to computers.
Ethernet II - This frame type combines the 802.3 preamble and SFD fields and include a protocol type field where the 802.3 frame contained a length field.
Ethernet SNAP - This frame type builds on the 802.2 frame type by adding a type field indicating what network protocol is being used to send data.
www.comptechdoc.org /independent/networking/guide/nethwethernet.html   (689 words)

 What is Ethernet? - a definition from Whatis.com - see also: Alohanet
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.
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.
searchnetworking.techtarget.com /sDefinition/0,,sid7_gci212080,00.html   (368 words)

 Ethernet   (Site not responding. Last check: 2007-10-22)
Ethernet, one of the pivotal technologies that made Local Area Networks possible, was developed in the 1970s by Digital, Intel and Xerox.
Ethernet operates at 10Mbps per second, and its packets are between 64 and roughly 1500 bytes in length.
Ethernet manufacturers are assigned a unique vendor ID, and are then responsible for insuring that all of their devices have unique addresses in the last 3 bytes.
www.freesoft.org /CIE/Topics/60.htm   (490 words)

Ethernet's bus topology permits devices to place data packets on the network anytime a device detect silence on the line.
To handle the demands of growth, an Ethernet can be extended using packet repeaters for signal regeneration, packet filters for traffic localization, and packet gateways for internetwork address extension.
Ethernet controllers in colliding stations each generate random retransmission intervals to avoid repeated collisions.
www3.baylor.edu /~Sharon_P_Johnson/etg/ethernet.htm   (893 words)

 Ethernet (Linktionary term)
Ethernet is a shared local area networking (LAN) technology that was developed in the early 1970s by some of the same pioneers who were working on the development of the Internet.
In coaxial cable Ethernet implementations, workstations are connected in a daisy-chain fashion by attaching segments of cable to each station as shown in A in Figure E-6.
Ethernet 10Base-2 (also called Thinnet) is the most common and practical of the coaxial cable schemes.
www.linktionary.com /e/ethernet.html   (4315 words)

 PC World - Ethernet Turns Thirty
Ethernet's collisions, which were the source of such controversy in the '80s, seem to have disappeared.
In the Ethernet business model, the model begins with a de jure standard hard-fought in standards organizations, which was the IEEE in Ethernet's case, and then it leads to implementations of the standard which are owned by their developers, not given away free like the open-source model.
Ethernet being used in some places, which is a factor of 3,000 times where we were 30 years ago, if my math is correct.
www.pcworld.com /news/article/0,aid,110771,00.asp   (1389 words)

 Ethernet History - Invention of Ethernet
This survey of the Ethernet is enriched by the authors intimate knowledge of its historical and developmental context.
He glances through the original 1970s papers by Metcalfe in which the Ethernet was parameterized as well as the unfortunate misunderstanding of Metcalfe's simple model of throughput, and the subsequent papers that tracked performance characteristics and corrected misunderstanding.
Ethernet has survived as the major LAN technology (it is currently used for approximately 85 percent of the world's LAN-connected PCs and workstations) because its protocol has the following characteristics: From Cisco Systems, Inc.
www.ideafinder.com /history/inventions/ethernet.htm   (956 words)

 Ethernet   (Site not responding. Last check: 2007-10-22)
Ethernet allows communication between workstations and are "Networked" by the use of transceivers(MAU - Medium Attachment Unit), transceiver cables(AUI), Shielded coaxial cables and commonly used Unshieled Twisted Pair(UTP) and Shielded Twited Pair(STP).
Sun reserved ethernet range starts with 8:0:20:xx:xx:xx The QFE is presently the only Sun ethernet card that has unique Ethernet Numbers, and future cards are expected to use this feature.
If the Ethernet cable is disconnected, SPARC machines with the sun4m architecture usually display this message, whereas machines with the sun4c architecture usually display the "le0: No carrier-- transceiver cable problem" message instead.
www.zwedruinternational.com /Bundled/ethernet.html   (6843 words)

Ethernet was developed by the Xerox Corporation's Palo Alto Research Centre (known colloquially as Xerox PARC) in 1972 and was probably the first true LAN to be introduced.
Ethernet uses a simple Carrier-Sense Multiple Access protocol with Collision Detection (CSMA/CD) to prevent two computers trying to transmit at the same time (or more correctly to ensure both computers retransmit any frames which are corrupted by simultaneous transmission).
Ethernet LANs may be implemented using a variety of media (not just the coaxial cable described above).
www.erg.abdn.ac.uk /users/gorry/course/lan-pages/enet.html   (900 words)

 PPL TELCOM :: Ethernet   (Site not responding. Last check: 2007-10-22)
With PPL Telcom’s Gigabit Ethernet, you have the flexibility to increase and decrease bandwidth on demand and interface with existing LAN protocols.
PPL Telcom’s all-optical network combines the cost-effectiveness of Ethernet and the flexibility of dense wave division multiplexing (DWDM) with the unparalleled diversity and redundancy of SONET through resilient packet ring architecture.
PPL Telcom’s Gigabit Ethernet offers the ability to create partially meshed networks within or between metropolitan locations, which reduces costs of legacy private line and frame relay networks.
www.ppltelcom.com /ethernet.html   (207 words)

 oreilly.com -- Online Catalog: Ethernet: The Definitive Guide
Ethernet has been the flavor of choice for networking administrators since the early 1980s.
Ethernet has been the flavor of choice for networking administrators since the early 1980s because of its ease of use and scalability.
Troubleshooting and Ethernet network performance is also covered, though most of the testing tools they cover are well beyond the budget of your average home user.
www.oreilly.com /catalog/enettdg   (1477 words)

 Learnthat.com Ethernet Definition. What is Ethernet?   (Site not responding. Last check: 2007-10-22)
Ethernet is a network standard of communication using either coaxial or twisted pair cable.
The most widely used for of LAN communication, Ethernet typically runs at 10 megabytes per second, though newer systems use 100 Mbps, or ever gigabit of transfer.
There are several flavors of Ethernet, including 10Base2 (10 Mbps, 200 meters), 10BaseT (10 Mbps, 100 meters, twisted-pair), and 100BaseT (100 Mbps, 100 meter, twisted-pair).
www.learnthat.com /define/e/ethernet.shtml   (136 words)

The original Ethernet was developed as an experimental coaxial cable network in the 1970s by Xerox Corporation to operate with a data rate of 3 Mbps using a carrier sense multiple access collision detect (CSMA/CD) protocol for LANs with sporadic but occasionally heavy traffic requirements.
Gigabit Ethernet, for example, is defined to operate over either twisted-pair or optical fiber cable, but each specific type of cable or signal-encoding procedure requires a different physical layer implementation.
Increasing the Ethernet transmission rate by a factor of ten over 10Base-T was not a simple task, and the effort resulted in the development of three separate physical layer standards for 100 Mbps over UTP cable: 100Base-TX and 100Base-T4 in 1995, and 100Base-T2 in 1997.
www.cisco.com /univercd/cc/td/doc/cisintwk/ito_doc/ethernet.htm   (10000 words)

 Ethernet Codes master page
I wish to thank the contributors, many are listed on the acknowledgments page and there are almost certainly others that I have missed.
There is also a list of other sources of Ethernet info.
Note that these pages are reports of codes seen "in the field" and are thus subject to errors of observation, and are certainly incomplete.
www.cavebear.com /CaveBear/Ethernet   (464 words)

 Vitesse - Technologies - Gigabit Ethernet (GbE)
Vitesse’s Ethernet design team earned the award, which was sponsored by Electronics Weekly, for its outstanding development work on the SparX™ family of Ethernet switches.
Ethernet has grown from its quiet beginnings in the early 1970’s in the Xerox Palo Alto Research Center to become the ubiquitous technology of Local Area Networks (LANs).
The Ethernet market is undergoing a massive transition from existing Fast Ethernet networks to Gigabit Ethernet networks, triggered by the key fact that modern telecommunications is the convergence of voice, video, and data, into digital bit streams that require significant amounts of bandwidth.
www.vitesse.com /ethernet   (1373 words)

 What is Ethernet? - A Word Definition From the Webopedia Computer Dictionary
Ethernet uses a bus or star topology and supports data transfer rates of 10 Mbps.
The Ethernet specification served as the basis for the IEEE 802.3 standard, which specifies the physical and lower software layers.
Ethernet uses the CSMA/CD access method to handle simultaneous demands.
www.webopedia.com /TERM/E/Ethernet.html   (499 words)

 B&B Electronics Industrial Ethernet Switches, Serial Servers, RS-485 Converters, RS-232, Wireless data communication ...
Ethernet Buzzword Guide - Ethernet has a zillion buzzwords and plenty of strange abbreviations and acronyms.
Route Ethernet signals through hostile RFI/EMI environments and extend distances up to 1.2 miles (2 km) with multi-mode fiber, up to 12.4 miles (20 km) with single-mode fiber.
Ethernet enable Modbus serial ports on industrial equipment with these easy-to-use, cost effective Modbus ASCII/RTU to TCP servers RS-232/422/485.
www.bb-elec.com   (362 words)

 Ethernet   (Site not responding. Last check: 2007-10-22)
The MTU for an Ethernet is 1500 and for 802.3 is 1492.
Ethernet Version 2 and IEEE 802.3 Frame Formats ----------------------------------------------- The Ethernet Version 2 frame format was designed before the IEEE specifications, but is almost identical to the 802.3 frame type.
In the 802.3 frame type, this two-byte field after the source address is a length field specifying the number of bytes in the LLC and data fields.
www-ee.eng.hawaii.edu /~msmith/XCoNET/Ethernet.htm   (1671 words)

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