From the schematic, we could learn that the USB data could be transmitted two way over USB matrix system by  PC >< CPU-USB Node >< USB Matrix >< CON-USB Node >< USB headset/camera/disk etc. For example, the Worksapce # 1 Operator get access the PC 1 by OSD, then the channel between CPU-USB Node #1 and CON-USB Node # 1 will be linked to transmit data, the operator could just plug the headset into CON-USB Node #1 to talk, whose data will be transmitted to CPU-USB Node # 1 for PC#1