Actually- a simple answer.  It's the motherboard.  You slide the processor & interface cards into the backplane for power (some management), & a transfer bus to the physical interface (be it Ethernet, Serial, FDDI, etc., etc).  I'm going to reach into controversy "probably," but it's a layer 1 bus.
 
That's it, but you're right it sounds a little heady :-)
Phil
 
> I still don't understand with cisco catalyst 5500 backplane. What does the
> backplane mean for ? is there anybody can answer this beginner question ?
> thank you.
>
> moerdo
>
>
>
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