The test setup consists of a point-to-point data link with one transceiver configured as a driver and the other one as a receiver. The EFT test pulses are applied via a capacitive clamp that surrounds the unshielded twisted pair (UTP) cable between the transceivers. Thus, the EFT test represents a common-mode test for differential transceivers. The table here shows five test levels for data ports. The first four levels double in voltage with each level increment. The fifth level, denoted as X, is a special level that can assume any test voltage. However, the applied test voltage must be specified in the manufacturer’s data sheet.