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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: MCI [ATM overhead]
Thank you for your interest in our announcement, "Connections to the Internet". We will send you a copy as soon as possible. For your information, please note that this information is also available at the web site http://www.cise.nsf.gov/cise/ncri/connect96.html Best regards, Mark Luker _________________________________________________ Mark Luker, Program Director NSFNet National Science Foundation 4201 Wilson Blvd, room 1175 Arlington, VA 22230 [email protected] (703)306-1949 Fax: (703)306-0621 On Wed, 20 Mar 1996, Paul Ferguson wrote: > At 08:38 AM 3/20/96 -0800, Wolfgang Henke wrote: > > > > >Thank you for the reference. I will certainly check it out. Here is a > >little table which I hope will help ISPs planning to upgrade bandwidth: > > > > > >SONET (Synchronous Optical Network) speeds given in Mbps > > > > nominal w/o Sonet ATM TCP/IP > > overhead > > > >OC-3 STS-3c 155.520 149 122 137 future net backbone > > > >OC-12 STS-12c 622.080 599 488 549 > > > >OC-48 STS-48c 2488.32 2396 1953 2197 current telco backbone > > > >OC-192 STS-192c 9953.28 9585 7813 8788 > > > >on single mode fiber > >or multi mode fiber > >or CATV 75 ohm coax (the lower speeds) > > > > And here's one that [fills in the gaps] shows the relationship between STS > and SDH: > > SONET/SDH Heirarchies > > SONET Bit Rate SDH > > STS-1/OC-1 51.84 Mb - > STS-3/OC-3 155.52 Mb STM-1 > STS-12/OC-12 622.08 Mb STM-4 > STS-24/OC-24 1244.15 Mb - > STS-48/OC-48 2488.32 Mb STM-16 > STS-192/OC-192 9953.28 Mb STM-64 > > - paul > >
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