Thank you guys, thats help me alot.
I required at Display-Solution for USB-Hub 4 Port DemoBoard and they offered me once for 50€ + sales tax, shipping (about 70€)
Thats much for a USB-Hub. Which of these 3 Hubs i will decide for, thats remains to be seen.
At PC would work 4 USB2CAN converters simultaneous. But how much will be work at Carambola?
At the HUB 3 Ports are extants, one is definitly booked for VideoStreaming.
For future i will post my progress here, to whom it may concern