[j-nsp] Optical integration - optical IMUX

[Paul Goyette]

This PIC allows you to run 4 links in parallel, with the
parallelism at the physical layer.  It appears to higher
layers as a single 40Gb/sec link.

You could, of course, run 4 separate links (as in an
aggregated interface) but that provide the parallelism
at layer 2.  

Or, of course, you could operate 4 separate layer 2 
links and perform load balancing at the IP layer, but 
then you'd be providing the parallelism at layer 3.

The difference is simply the layer at which parallelism
is provided.

For more details, you can contact your Juniper account
team.