Question D420 with MM1000 DI - how does everything plug in?

Hi,

I'm looking at buying a D420 with MM1000 DI. Also planning on running it using ethernet control and also use a SE2300 switch unit to control the dust extraction.

So I think i'll have 3 parallel port connectors to attach somewhere (ethernet adapter, MM1000 DI and SE2300) - I see there is a 2nd layer module to expand the number of ports but where does that go? Do you get a switch box in the kit? None of the pictures show one, only the ports on the machine itself.

Can someone explain to me please

Thanks
David