It is a signal integrity analysis tool that shows how a digital signal behaves as it travels through a real channel. Used correctly, it reveals what is degrading the data stream, how much margin remains in the timing budget, and where your PCB design is limiting overall system. The eye diagram test is an indispensable methodology for evaluating the signal integrity and performance of high-speed digital communication systems, particularly in the domain of optical transceivers. Fundamentally, an eye diagram is a graphical representation of a digital signal's quality, formed. An eye diagram is one of the most effective methods for analyzing the signal integrity of your PCB designs. Explore services to accelerate every step of your innovation journey. Streamlining Jitter and Eye-Diagram Analysis This application note, "Streamlining Jitter and Eye-Diagram Analysis:. In telecommunications, an eye pattern, also known as an eye diagram, is an oscilloscope display in which a digital signal from a receiver is repetitively sampled and applied to the vertical input (y-axis), while the data rate is used to trigger the horizontal sweep (x-axis). Today's 100G, 400G, and 800G links are completely different.