[c-nsp] DWDM optics on 6500s

[Kevin Graham]

> As a side issue, there are electrical limitations imposed by the physical 

> cross-bar unit inside the actual chassis, but I don't know how much of a problem 
> these limitations are in practice.

6500E was the key for this. Besides nutty amounts of POE capacity, it also picked up
improved backplane for >20g+ fabric and extending to all 11 LC slots in the 6513.

(Still need to dig up details, as faster SSO time is also tied to chassis, though
I can't recall why).