[2182] in North American Network Operators' Group
Re: MCI [ATM overhead]
daemon@ATHENA.MIT.EDU (William Allen Simpson)
Thu Mar 21 04:15:04 1996
Date: Thu, 21 Mar 96 08:48:40 GMT
From: "William Allen Simpson" <wsimpson@greendragon.com>
To: nanog@merit.edu
> From: salo@msc.edu (Tim Salo)
> > From: Wolfgang Henke <wolfgang@whnet.com>
> > 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
> > [...]
>
> I think your 122 Mbps "ATM" number could be a bit confusing, even knowing
> the assumptions you described in earlier mail. (Also, more bandwidth seems
> to be available to "TCP/IP" than appears to be available from ATM...)
>
I believe that the number is for TCP/IP carrying capacity _without_ ATM.
> One could remove the ATM overhead, but then one has a point-to-point
> link, rather than a link over which data from many sources can be
> multiplexed.
>
Rather, that leaves us with the excellent (very desirable) option of a
link where data from many sources are multiplexed by TCP/IP....
I do not see what ATM buys in this situation.
WSimpson@UMich.edu
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BSimpson@MorningStar.com
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