Here are some key parameters to selecting a USB switch: A 3dB Bandwidth is max frequency signal that the device is able to route with acceptable loss. For USB 3.0 signals operating at 5Gbps ideally the operating frequency should be > 2.5GHz. However, higher the frequency the better the system performance. Pericom offers USB 3.0 switches with a 3dB bandwidth of up to 10.6GHz. The On Resistance and Ron Flatness: On resistance (Ron) is the resistance of the closed switch path between the drain and source terminal. Ron should be as low as possible, to achieve almost no energy loss during throughput. Ron flatness is the variation in on resistance over the full signal range. Ron flatness is defined as the difference between the maximum and minimum values of on resistance as measured over the specified analog signal range. The Insertion Loss is a measure of power loss or signal attenuation at a given frequency and is measured in dB. Losses greater than 1 or 2dB will attenuate peak signal levels and increase rising and falling edge times. The Return Loss is caused by impedance mismatch between circuits. Switches with excellent return loss performance ensure optimum power transfer through the switch.