This article shows engineers how to read an eye diagram optical transceiver during commissioning and ongoing monitoring, helping data center teams and service providers connect the waveform to measurable network outcomes. Eye height is the vertical distance between the upper and lower boundaries of the eye diagram. The larger the eye height, the more “open” the eye appears. When a link suddenly drops packets or fails in a new rack, the root cause is often signal integrity, not cabling “looks. Fundamentally, an eye diagram is a graphical representation of a digital signal's quality, formed. An eye diagram is a visual representation of a digital signal over time, formed by capturing multiple images of a signal's waveform and superimposing them over one another.
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