NETWORK WORLD NEWSLETTER: STEVE TAYLOR AND JOANIE WEXLER ON WIDE AREA NETWORKING 08/31/04 Today's focus: Bandwidth efficiency an important consideration
Dear [EMAIL PROTECTED], In this issue: * Bandwidth efficiency through the ages * Links related to Wide Area Networking * Featured reader resource _______________________________________________________________ This newsletter is sponsored by Statscout Blanket Network Performance Monitoring Monitor your entire network every 60 seconds with minimal impact on the network. Businesses and organizations seeking detailed performance and troubleshooting reporting on networks of 1000 to 200,000 network interfaces in size will benefit substantially from using Statscout. Request your 30-day trial now, click here http://www.fattail.com/redir/redirect.asp?CID=78755 _______________________________________________________________ IS SECURITY RIPE FOR OUTSOURCING? Security demands for online applications such as e-commerce and Web services are prompting more corporate customers to hand off security functions - such as intrusion detection and firewalls - to outside service providers. Find out if security should be outsourced in this Network World article: http://www.fattail.com/redir/redirect.asp?CID=78285 _______________________________________________________________ Today's focus: Bandwidth efficiency an important consideration By Steve Taylor and Joanie Wexler Over the years, one of the most important parameters in choosing technologies and equipment based on certain technologies has been efficiency. Simply put, efficiency is the percentage of bandwidth used for actual data transport as compared with the total bandwidth consumed - for both the data and the overhead - in the transport process. The bandwidth efficiency might also account for packet data efficiency. Let's look at some historical examples. Twenty years ago, we were seeing the dawn of a new era of data networking when end users started purchasing T-1 and E-1 services - which were originally designed for voice traffic - and using these services to transport data. The efficiency issue here was actually based on efficiency of TDM techniques. T-1, for instance, was, and for that matter still is, extremely bandwidth-efficient for transporting 24 channels of 64K bit/sec PCM voice. In fact, the transport is almost 99.5% efficient since 1.536M bit/sec of the 1.544M bit/sec transmission rate could be used for information transport. However, the voice-centric formats, known as Superframe Format (SF) and Extended Superframe Format (ESF), were quite inefficient for data devices of the era. When using SF and ESF, 12.5% of the remaining bandwidth was lost to guaranteeing "ones density" in most cases, resulting in the standard transmission speed of 56K bit/sec rather than 64K bit/sec. And the efficiency got even worse for the typical (for the day) data device speeds of 9.6K bit/sec and 19.2K bit/sec. A number of companies, such as Timeplex, N.E.T., and General DataComm, emerged with products that used a proprietary "flexible framing" format optimized for squeezing traffic more efficiently into a TDM stream. They also introduced some of the first sub-64K bit/sec voice algorithms. All of this was driven by the price of WAN bandwidth. After all, at this point a coast-to-coast T-1 circuit in the U.S. cost on the order of $40,000 per month. And this was for bandwidth that is of the same order of magnitude that you get from a consumer DSL or cable modem service today. Next time we'll continue this discussion, moving on to packet technology. _______________________________________________________________ To contact: Steve Taylor and Joanie Wexler Steve Taylor is President of Distributed Networking Associates and Publisher/Editor-in-Chief of Webtorials.Com. For more detailed information on most of the topics discussed in this newsletter, connect to Webtorials.Com <http://www.webtorials.com/>, the first Web site dedicated exclusively to market studies and technology tutorials in the Broadband Packet areas of Frame Relay, ATM, and IP. He can be reached at <mailto:[EMAIL PROTECTED]> Joanie Wexler is an independent networking technology writer/editor in California's Silicon Valley who has spent most of her career analyzing trends and news in the computer networking industry. She welcomes your comments on the articles published in this newsletter, as well as your ideas for future article topics. Reach her at <mailto:[EMAIL PROTECTED]>. _______________________________________________________________ This newsletter is sponsored by Statscout Blanket Network Performance Monitoring Monitor your entire network every 60 seconds with minimal impact on the network. Businesses and organizations seeking detailed performance and troubleshooting reporting on networks of 1000 to 200,000 network interfaces in size will benefit substantially from using Statscout. Request your 30-day trial now, click here http://www.fattail.com/redir/redirect.asp?CID=78754 _______________________________________________________________ ARCHIVE LINKS Archive of the WAN newsletter: http://www.nwfusion.com/newsletters/frame/index.html _______________________________________________________________ FEATURED READER RESOURCE WONDERING IF YOUR PAY IS UP TO SNUFF? Check out Network World's 2004 Salary Calculator to see if you're getting paid what you're worth. Using data collected in the 2004 Network World Salary Survey, we've programmed this calculator with several categories that could affect your pay. Answer the questions and find out what the average salary is for your job category. Click here: <http://www.nwfusion.com/salary/2004/calculator.html> _______________________________________________________________ May We Send You a Free Print Subscription? You've got the technology snapshot of your choice delivered at your fingertips each day. Now, extend your knowledge by receiving 51 FREE issues to our print publication. Apply today at http://www.subscribenw.com/nl2 International subscribers click here: http://nww1.com/go/circ_promo.html _______________________________________________________________ SUBSCRIPTION SERVICES To subscribe or unsubscribe to any Network World e-mail newsletters, go to: <http://www.nwwsubscribe.com/Changes.aspx> To unsubscribe from promotional e-mail go to: <http://www.nwwsubscribe.com/Preferences.aspx> To change your e-mail address, go to: <http://www.nwwsubscribe.com/ChangeMail.aspx> Subscription questions? Contact Customer Service by replying to this message. This message was sent to: [EMAIL PROTECTED] Please use this address when modifying your subscription. _______________________________________________________________ Have editorial comments? Write Jeff Caruso, Newsletter Editor, at: <mailto:[EMAIL PROTECTED]> Inquiries to: NL Customer Service, Network World, Inc., 118 Turnpike Road, Southborough, MA 01772 For advertising information, write Kevin Normandeau, V.P. of Online Development, at: <mailto:[EMAIL PROTECTED]> Copyright Network World, Inc., 2004 ------------------------ This message was sent to: [EMAIL PROTECTED] ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/BCfwlB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/kumpulan/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
