Tektronix NRZ-M4 is a PC based application which offers optical NRZ signaling analysis, including TDEC(Transmitter and Dispersion Eye Closure) measurement. The application brings together NRZ optical measurements in a simple and easy to use application.NRZ-M4 provides the following features: - Analyze up to 4 optical channels at a time. - Perform TDEC (Transmitter and Dispersion Eye Closure) - Signal characterization measurements such as Amplitude, Timing measurements - Characterization of 100Gbps Optical transceivers(SR4, LR4) devices with Mask margin measurements. Perform optimal mask fitting for better margin. - Support for measurements at various population limits. - Display 2D eye diagrams with an embedded mask.