[nsp] atm encapsulation overhead

Gert Doering gert at greenie.muc.de
Tue Nov 18 04:26:45 EST 2003


On Tue, Nov 18, 2003 at 10:03:00AM +0100, Iva Cabric wrote:
> > calculate it. they only deal with calculating and showing aal5snap.
> Difference between aal5mux and aal5snap is 8 bytes (LLC/SNAP). So Table
> 6, in PS document, states this:
> LLC/SNAP			1.37%

Unfortunately, that's not all of it.  With aal5mux, a TCP ACK packet with
no data fits into *one* ATM cell, with aal5snap, you will always need two.

So for typical web traffic (data going one way, pure ACKs in the other
direction), aal5snap overhead is significantly higher.

I don't have numbers, though.


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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de

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