On Mon, 2006-06-19 at 22:35 -0700, Chris Wedgwood wrote: > On Wed, Jun 14, 2006 at 11:40:04AM +0200, Jesper Dangaard Brouer wrote: > > > The Linux traffic's control engine inaccurately calculates > > transmission times for packets sent over ADSL links. For some > > packet sizes the error rises to over 50%. This occurs because ADSL > > uses ATM as its link layer transport, and ATM transmits packets in > > fixed sized 53 byte cells. > > What if AAL5 is used? The cell-alignment math is going to be wrong > there surely?
Actually it _is_ AAL5 which is accounted for. See Chapter 5 "ADSL link layer overhead" (page 48-54). http://www.adsl-optimizer.dk/thesis/main_final_hyper.pdf -- Med venlig hilsen / Best regards Jesper Brouer ComX Networks A/S Linux Network developer Cand. Scient Datalog / MSc. Author of http://adsl-optimizer.dk
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