Anritsu BERTWave Series, Руководство по эксплуатации, Страница: 58 / 466

Chapter 1 Outline
1-32
Eye Width
Eye Width is equivalent to Eye Height in the horizontal direction. For
NRZ, it is calculated from a histogram of the two eye pattern crossing
points in the time direction.
Eye Width = (t
2
– 3 
2
) – (t
1
+ 3 
1
)
t
1
: Average time of first crossing point
t
2
: Average time of second crossing point

1
: Standard deviation of first crossing point

2
: Standard deviation of second crossing point
Figure 1.5-16 Eye Width
For PAM4, Eye Width is the width in time axis direction to be the defined
bitrate or less. Refer to Figure 1.5-12.
t
1
3

1
3

2
Eye Width
t
2