Method for transmitting Usb signal and usb transmission system

The present invention, first data signal is differentially transmitted through the first conductor pair (32), transmitting a second data signal via a second conductor pairs (34) differentially to a method of transmitting three data signals from one of the USB signals. Signal portions of the third data signal via a first conductor pair is transmitted as a common mode component, the reference portion of the third data signal is transmitted as a common mode component via a second conductor pair . The present invention further, USB transmission system for carrying out the method, and to adapters for USB transmission systems.