> 
> MAC is the media access controller.  Its sort of a
> logical networking 
> layer.  For example, all ethernet devices use the
> same MAC protocols, so 
> its common to use a single MAC device.  On a NIC,
> this is usually the 
> main brains of the device.
> 
> The PHY is the physical layer part -- the part that
> does the actual 
> electrical or optical signaling, such as the
> transceiver.
> 
> It is not uncommon to have a single MAC controller
> that can have 
> alternate PHYs, e.g. variants for optical or copper
> signaling might use 
> the same MAC, but different PHYs.


allright, so  basically these two pieces of silicon  correspond 
more or less to the  2 bottom layers  of the  ISO  networking  model.
And the PHY  sholud be outside of Software Control  ? 
or does it need to be initialised/booted up with some sort 
of parameter string  ? 

( Im just trying to understand the challanges of getting a specific set of 
hardware to play ) 

//Lars
 
 
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