Multi-port powerlines

Hi

I fear this is a daft question but I've failed to find the answer online.

How does it work if both powerline adapters have, say, three ports. If I connect Plug A to the router I can understand the benefit of having multiple ports on Plug B. But -
What are the spare ports on Plug A for? Just usable additional ports at the router end?
Do I just view the two plugs together as a 6 port switch? With no specific "up" socket?
And how does bandwidth work if I use multiple ports at both ends?

One daft question seems to have turned into about ten. Thanks for any help.

Plug A and B are interchangeable, there's no designated 'router input'.
You can swap them, you can add additional ones - Plug C, Plug D.
It's just a powerline plug combined with a LAN switch.

Oh, and bandwidth will be shared.

Edited by deleted (Sat 27-Feb-16 17:55:28)

also means you can add one at the router end, and not loose any free ports.

though there are some kits with one socket on the 'master' (for the router) and 2 on the 'slave' units

for example: http://www.maplin.co.uk/p/bt-mini-wi-fi-home-hotspot...

Makes sense

Thank you

Yes, I'd seen some like these (which did make more sense to me at first).

In the end I think I'm most likely to go for simple 1-1 adapters for the mo.

Thanks for commenting