Re: IP over ATM overhead

[johnc () msc edu (John Cavanaugh)]

> We are installing an ATM backbone connection and wondering what level 
> of overhead can be expected. ...

I wrote a paper on this subject a couple of years ago.  You can find
it at
        http://www.msci.magic.net/
under "Papers," the title is "Protocol Overhead in IP/ATM Networks",
or at
        ftp://www.magic.net/pub/overhead.ps

The level of protocol overhead depends on the medium, the AAL, and the
size of the transmission unit.  The best you'll do is to get 87% of the
raw bandwidth to the application (most of this is taken up by the lower
layers (ATM and below)), and this number can go as low as 70%.
-- 
John Cavanaugh                              EMail: johnc () msc edu
Minnesota Supercomputer Center, Inc.
1200 Washington Ave. S                      Phone: +1 612 337-3556
Minneapolis, MN  55415                      FAX:   +1 612 337-3400
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