THE WHATIS.COM WORD-OF-THE-DAY July 26, 2002 EtherLoop ______________ TODAY'S SPONSOR: The .tv Corporation
Save 30% on Web addresses! Not only will you get a great deal on your Web addresses, but you'll also get superior customer service, innovative products and services and a place that is easy to register and manage your Web addresses. Great names are still available. Register the names you want before someone else does! Check it out now: http://WhatIs.com/r/0,,4698,00.htm?the.tvcorporation ______________ TODAY'S WORD: EtherLoop See our definition with hyperlinks at http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci840596,00.html EtherLoop, sometimes called next generation DSL or second generation DSL, combines features of Digital Subscriber Line (DSL) with features of Ethernet to provide both voice and data transmission (including Internet connection) over any ordinary phone line at data rates faster than DSL. EtherLoop offers a data transfer rate up to 6 Mbps over distances of up to 21,000 feet. Developed by Nortel, EtherLoop, unlike DSL, uses the half-duplex transmission of Ethernet. Because half-duplex transmission is less susceptible to certain kinds of interference from adjacent lines and devices such as bridge taps, existing phone lines can be used without special conditioning or replacement. Unlike Ethernet and like DSL, transmission is point-to-point which means that connection speed is not decreased while multiple users are sharing the same path. Because transmission is point-to-point, at any given time one device can be designated as the server and the other the client. The server decides when the client can transmit, so collisions (which are a problem with Ethernet) can be avoided. Like Ethernet, EtherLoop operates in a burst transmission mode; packets are sent in bursts, according to demand. EtherLoop uses the idle time between bursts to monitor performance, check for problems, and select alternate paths when necessary. Jack Terry, then with Nortel, initiated the EtherLoop project in 1996. Terry's goal was to create a telco-based technology that would be competitive with cable for the high-speed market. To this end, EtherLoop was designed to take advantage of existing resources in a more efficient manner. Because voice traffic only uses a small portion of the bandwidth in regular phone wire, about a megahertz (MHz) of available bandwidth is available for data. EtherLoop is suitable for a broad range of applications, including local area network (LAN) extensions, hotels, campus area networks, as well as residential and corporate Internet access. RELATED TERMS: Digital Subscriber Line http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213915,00.html Ethernet http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212080,00.html half-duplex http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212221,00.html bridge tap http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci214436,00.html collision http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211814,00.html packet http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212736,00.html telco http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213109,00.html bandwidth http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci211634,00.html local area network http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci212495,00.html SELECTED LINKS: Minerva Networks provides a white paper about EtherLoop. http://www.minervanetworks.com/alliance/resources/Elastic/EtherLoop white paper.pdf ISP Planet has an article about "Next-Generation DSL." http://www.isp-planet.com/technology/etherloop.html ______________________ WHATIS DISCUSSION FORUM | Rank the job candidates - win a prize! THE CHALLENGE: Rank the job candidates from 1-7, with 1 being the most desirable candidate. Explain your reasoning for a chance to win a TechTarget baseball cap! - job experience - job experience and certification(s) - certification(s) only - college degree - college degree and certification(s) - college degree, certification(s) and experience - recommended by someone who already works for the company >>Take the challenge http://whatis.discussions.techtarget.com/WebX?[EMAIL PROTECTED]@.1dcfae0e/79!viewtype= ______________________ QUIZ #28 | Ethernet How much do you know about the most popular network technology in the world? Take our latest quiz and find out! http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci834253,00.html ______________________________ RECENT ADDITIONS AND UPDATES [1] electron rest mass http://whatis.techtarget.com/definition/0,,sid9_gci839930,00.html [2] tap http://whatis.techtarget.com/definition/0,,sid9_gci840080,00.html [3] SAML http://searchsecurity.techtarget.com/sDefinition/0,,sid14_gci839675,00.html [4] azimuth and elevation http://whatis.techtarget.com/definition/0,,sid9_gci838808,00.html [5] digital projector http://whatis.techtarget.com/definition/0,,sid9_gci839140,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Assistant Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Created by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2002, All Rights Reserved. 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