Shared link allows each HX3 downstream port to be split into an internal SuperSpeed port and a standard USB 2.0 port. In the example on this slide, two HX3s down streams ports (port 3 and port 4) are each split into two ports for internal and external connections. The downstream port 4 is split into a SuperSpeed and a USB 2.0 port for internal USB devices, such as a USB 3.0 camera on the internal SuperSpeed port, and a USB 2.0 Wi-Fi module on the internal USB 2.0 port. It is important to note that when a shared link is enabled on a downstream port, the SuperSpeed port can be used only for internal connection. Whereas the USB 2.0 port could be internal or external. The enlarged portion of the image illustrates the splitting of a standard USB port by shared link. A USB 3.0 port includes three pairs of differential data signals. The D+/D- part for USB 2.0, the TX+/TX- and RX+/RX- pairs for SuperSpeed. When shared link is enabled on a downstream port, the Tx and Rx are split off with their own Vbus line used for the internal SuperSpeed connection. The D+/D- pair remains available for a simultaneous USB connection.