MCI [ATM overhead]
Mark A. Luker (CISE/NCRI)
mluker at nsf.gov
Fri Mar 22 23:40:26 UTC 1996
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 at 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
>
>
More information about the NANOG
mailing list