I guess it depends on what you consider to be part of CSMA/CD.  Exponential 
backoff definitely has functionality in the stack.

On Tuesday 28 May 2002 01:17 am, Ignatios Souvatzis wrote:
> On Tue, May 28, 2002 at 01:20:08AM -0700, Seth Kurtzberg wrote:
> > It isn't really in a single place.  Part is clearly in the ethernet
> > device driver code, and I believe the exponential backoff is further up
> > the stack.
>
> I believe you're mistaken. That code is implemented in hardware (well,
> maybe in microcode for the hardware controller) for all Ethernet devices I
> know about.
>
> Regards,
> 	-is

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