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VIEWS: 5 PAGES: 4

									       Where Do the 7 layers “fit”?
                    Application    7


Or, where is        Presentation   6
the dividing line                      ?
between hdw &       Session        5
s/w?
                    Tran sport
                                   4

                    Network        3

                     Data /Link    2   ?

                     Physical      1
Implementing the Model
    User Space Software




                          OS Space
                          Software




         Firmware

            Hardware
        Some More Definitions
• User Space Software - Code that executes as any
  program that a normal user could compile and run
• OS Space Software - Code that executes on the
  host CPU but in a mode or with special access that
  normal users can not use
• „Firmware‟ - Code that executes on a processor
  (special or general purpose) that is different from the
  host CPU; may be in PROM or RAM downloaded from
  another source
• Hardware - Generally special purpose VLSI and
  analog/linear interface components
Assigning the 7 layers
     • Performance

          • vs

      • Flexibility

								
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