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 mluker@nsf.gov (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