Thank you very much,
I ment to integrate a "hub" onto the board so integrate all this in one board.
For now I'll lookup more based on your info.
( btw. I would let the circuit board being produced although its expensive, because I'm sure I can't build one myself that exactly. )
After some research I've got some more questions.
1. I assume that the modem needs more power than i.e. four microsdhc-readers and a hub.
Is this right?
2. When it's right they have to get their power from somewhere too, so I need a voltage converter on the board too. I see, I'm loosing space on my planned board
