THE WHATIS.COM WORD-OF-THE-DAY January 22, 2003 EtherLoop
______________ TODAY'S SPONSOR: VeriSign - The Value of Trust Secure all your Web servers now - with a proven 5-part strategy. The FREE Server Security Guide shows you how to: * DEPLOY THE LATEST ENCRYPTION and authentication techniques * DELIVER TRANSPARENT PROTECTION with the strongest security without disrupting users. And more. Get your FREE Guide now: http://WhatIs.com/r/0,,9261,00.htm?freeguide ______________ TODAY'S WORD: EtherLoop See our complete 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: DSL 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 telco http://searchnetworking.techtarget.com/sDefinition/0,,sid7_gci213109,00.html ______________________ SELECTED LINKS: Paradyne offers a white paper about EtherLoop. http://www.paradyne.com/pdf_central/etherloop.pdf ISP Planet has an article about "Next-Generation DSL." http://www.isp-planet.com/technology/etherloop.html ______________________ QUIZ #3 | Storage Take our quiz and test your knowledge about how data is stored. http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci551320,00.html ______________________ Learning Path | Customer Relationship Management Give yourself a quick tutorial in customer relationship management (CRM) by reading our series of related definitions in sequence. http://searchcrm.techtarget.com/sDefinition/0,,sid11_gci788453,00.html ______________________________ RECENT ADDITIONS AND UPDATES [1] speed of gravity http://whatis.techtarget.com/definition/0,,sid9_gci874815,00.html [2] double integral sign http://whatis.techtarget.com/definition/0,,sid9_gci874054,00.html [3] data source name http://searchvb.techtarget.com/sDefinition/0,,sid8_gci874018,00.html [4] systems thinking http://searchcio.techtarget.com/sDefinition/0,,sid19_gci874009,00.html [5] Advanced Planner and Optimizer http://searchsap.techtarget.com/sDefinition/0,,sid21_gci874121,00.html ____________________________________________________________________ ::::::::::::::::::: WHATIS.COM CONTACTS ::::::::::::::::::: LOWELL THING, Site Editor ([EMAIL PROTECTED]) ____________________________________________________________________ MARGARET ROUSE, Associate Editor ([EMAIL PROTECTED]) ___________________________________________________________________ :::::::::::::::::::: ABOUT THIS NEWSLETTER ::::::::::::::::::::: Published by TechTarget (http://www.techtarget.com) TechTarget - The Most Targeted IT Media Copyright 2003, All Rights Reserved. Unsubscribe from 'Word of the Day' - Simply Reply to this Email with REMOVE within the Body or Subject > or - Go to: http://WhatIs.techtarget.com/register - Log in to edit your profile. - Click on the link to Edit email subscriptions. - Uncheck the box next to the newsletter you wish to unsubscribe from. - When finished, click "Save Changes to My Profile."
