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Eye-Diagram Analyzer Reference
Applying Mask Testing
Automatic Alignment Scales the Mask
The MASK ALIGN softkey, located under the Masks menu, automatically
aligns and scales a default mask to the data per the SONET/SDH standards.
This is accomplished using histograms and is best done in eye mode for faster
and more evenly distributed data acquisition. Eye mode provides a more even
statistical distribution of high and low data. This results in faster acquisition of
the histogram data used to determine zero and one levels. The mask and limit
lines adjust to fit the displayed data. To change the number of samples used
for the histogram, use the Measure menu’s NUMBER SAMPLES function.
Display the Error Trace
Use the err trc ON OFF softkey to display a trace that violates a mask. The
screen is split with the error trace displayed in the lower half of the display.
Trace four is allocated as the error trace.
Mask Margins Tighten Mask Tests
Margins can be added to the mask/limit line tests. This margin is added as a
percent of the mask. Zero percent margin corresponds to the default mask.
One hundred percent margin corresponds to the mean of the histograms of
the one and zero levels, and the crossing points.
Negative mask margins can also be implemented. These can be used to gain an
idea of time severity of the encountered errors.