North American Network Operators Group
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Re: Exchanges that matter...

  • From: Joe Rhett
  • Date: Sat Dec 07 16:01:56 1996 
 
> > HDLC framing bytes =   3080633605		HDLC efficiency = 97.72
> > ATM framing bytes =   3644304857		ATM efficiency = 82.61
> > ATM w/snap framing bytes =   3862101043	ATM w/snap efficiency = 77.95
> 
> At a certain point, some of these arguments about ATM efficiency sound a bit
> like saying FDDI is terrible because 4B/5B encoding is only 80% efficient.
> 
> I think a more interesting measure of the value of ATM versus other 
> wide-area technologies is some sort of measure of throughput per dollar.
 
The issue that everyone seems to be overlooking is network design
flexibility. Even if ATM has higher overhead, you can only grow a FDDI
network so much. It really isn't all that hard to max out most FDDI
switches.

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