The DS26334 and DS26324 line interface units (LIUs) contain precise methods for making minor or major changes to the output pulse. This application note provides the information required to access factory test registers that allow the transmit waveform to be modified to meet a wide variety of application requirements. With the addition of network-protection components and/or the need to route signals through connectors and other PCB requirements, it is sometimes necessary to manipulate the transmit waveform.