johnc@msc.edu (John Cavanaugh) writes:
You can find a paper that addresses this question at
http://www.msci.magic.net/docs/magic/overhead.ps or
fte:ftp.magic.net/pub/magic/overhead.ps
It covers OC-3c, OC-12c, 100 and 140 Mbps TAXI, and DS3 framing, and
gives the effective bandwidth at each layer.
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)
Additions and corrections are welcome.
Wed Mar 20 07:56:41 PST 1996
http://www.whnet.com/wolfgang/sonet.html
John Cavanaugh EMail: johnc@msc.edu
Minnesota Supercomputer Center, Inc. johnc@cray.com
1200 Washington Ave. S Phone: +1 612 337-3556
Minneapolis, MN 55415 FAX: +1 612 337-3400
Wolfgang
Wolfgang Henke wolfgang@whnet.com . http://www.whnet.com/wolfgang/
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