What is an Eye Pattern?

What is an Eye Pattern?

The eye pattern is data bits acquired on the display overlaid one on top of each other. Using this technique allows for a quick study of most of the data characteristics. When a pseudorandom data stream is displayed as an eye pattern, the overall quality and stability of the communications system can be observed. Data-stream problems such as excessive noise or timing jitter, tend to close the eye. In addition, the rise time and fall times of the data signal and pulse parameters, such as duty cycle, overshoot, and undershoot, can be observed.