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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: MCI [ATM overhead]
[email protected] (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: [email protected] > Minnesota Supercomputer Center, Inc. [email protected] > 1200 Washington Ave. S Phone: +1 612 337-3556 > Minneapolis, MN 55415 FAX: +1 612 337-3400 Wolfgang Wolfgang Henke [email protected] . http://www.whnet.com/wolfgang/ WH Networks ... ftp.whnet.com /pub/wolfgang 2672 Bayshore Parkway Suite 503 ....... +1 415 390 9316 Mountain View CA 94043 ................... fax +1 415 390 9317
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