Some additional key parameters include: Off Isolation is the amount of noise picked in a switch in the OFF state from adjacent switch in ON state. Isolation becomes more important at higher frequencies such as USB 3.0 (5Gbps or 2.5GHz) and PCIe 3.0 (8 Gbps or 4GHz). High isolation reduces the influence of signals from other channels, sustains the integrity of the measured signal, and reduces system measurement uncertainties. Crosstalk is defined as magnitude of signal that is coupled between the circuits. Crosstalk is usually caused by undesired capacitive, inductive, or conductive coupling from one circuit, part of a circuit, or channel, to another. Higher cross talk will cause signal degradation. ESD Protection is an important feature for USB switches. Standard USB switches are designed to be protected up to ±2kV Human Body Model (HBM). A designer can add additional ESD protection externally, but this consumes valuable board area and adds capacitance to the input/output line. Overvoltage Protection means the switch is guaranteed to withstand specified voltages on the analog inputs which exceed the supplies. Pericom’s USB switches are designed with 5V protection.