But I'd like to have also the possibility to plug a rj45 connector for ethernet.
So why not find a way to mix usb and rj45?
I mean to carry two different signals through the same connector?
The solution could be to modify the usb connector in order to allow 8 channels.
Another solution could be using a converter for multiplexing and demultiplexing from 8 eight to 4 chanels.
