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Cell Relay Retreat>List Archive>month:1999-Jan> msg00160



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Re: CR: Re: relationship bewteen PCR, SCR and MBS

  • From: Jan Novak <Jan.Novak@dante.org.uk>
  • Date: Wed, 27 Jan 1999 10:01:04 +0000
  • cc: cell-relay@cell.onecall.net, Jan.Novak@dante.org.uk


> > what should they be ? is there a rule of
> > thumb ? Outside of the "suck it and see" approach, is there a forumale
> > to use ?
> > 
> 
> i don't know enough to give you an answer.  but i think that in
> selecting these parameters you have to know something about your
> traffic pattern, and how bursty it is.  based upon the figures that
> you cited above, it suggests to me that you will be able to transmit
> a continuous blast of cell traffic at the pcr for up to 15 seconds
> and still be in compliance with the traffic descriptor.

A basic rule for MBS is to be at least MTU of the media, behind ATM
connection (ethernet in LANE for example e.g. about 35 cells)
or AAL5 MTU if you have native ATM connection to the endsystem.