MATLAB: What is the difference between Eye Height and Vertical Opening in the Eye Diagram object

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I am plotting and Eye Diagram object from data in my signals and I cannot understand Eye Height vs Vertical Opening. What is the difference between Eye Height and Vertical Opening in the Eye Diagram object?

Best Answer

Eye height is the distance between μ – 3σ of the upper eye level and μ + 3σ of the lower eye level. μ is the mean of the eye level and σ is the standard deviation.
The vertical opening is the distance between the two points that correspond to the BER threshold. For example, for a BER threshold of 10–12, these points correspond to the 7σ distance from each eye level.
Similarly for width and horizontal distance. You can read the definitions of all measurements here:
https://www.mathworks.com/help/comm/ref/comm.eyediagram-system-object.html
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