Anritsu BERTWave Series, Operation Manual, Page: 65 / 466

1.5 Technical Terms
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Outline
RNzero: Electrical random noise power measured at Level 0
OMA:
For NRZ signal, OMA, and for PAM4 signal, Outer OMA.
BW: Bandwidth of the filter used
Rise/Fall Time
The Rise Time is time taken for the signal level to change to the next
level.
 From 20% level of amplitude to 80%
 From 10% level of amplitude to 90%
The Fall Time is the time taken for the signal level to change to the next
level.
 From 80% level of amplitude to 20%
 From 90% level of amplitude to 10%
For the MP2110A, the rise and fall time measurement level can be
selected from either 10/90% or 20/80%.
Rise Time
*1
*2
“0” Level
“1” Level
Eye amplitude
Fall Time
*1: 90 or 80 % *2: 10 or 20 %
Figure 1.5-23 Rise and Fall Time