Design guide app note from Alpha & Omega Semiconductor on USB 3.0 protection. Link here (PDF)
USB 3.0 is an enhanced version of the USB 2.0, with up to 5Gbps data rate. USB 3.0 has 10 times the performance over USB 2.0. Legacy device continue to work when plugged into new host connector albeit at USB 2.0 speeds. USB 3.0 maintains this backward compatibility by adding an addition pairs of SuperSpeed differential data lines, SSRX+/- and SSTX+/- with the existing pair of USB 2.0 data line, D+ and D-. The SSRX and SSTX is the differential data line that we are focus in the PCB layout and ESD protection.
A carefully designed PCB layout in combination with rugged ESD protection is vital for a robust operating system.