Anritsu BERTWave MP2100B, Operation Manual, Page: 176 / 382

Chapter 6 Measuring Bit Error
6-16
Pattern Sync
Auto SYNC sets the pattern sync method.
[On]: If the bit error rate set at Sync Threshold is exceeded, patterns
synchronization is evaluated as lost and synchronization processing
is performed.
[Off]: Pattern synchronization processing is not performed.
Set Auto Sync to [On] at measurement start.
After pattern synchronization processing, if there are bit errors exceeding
the bit error rate set at Sync Threshold, leave pattern synchronization
processing set to [On].
After pattern synchronization processing, even if there are bit errors
exceeding the bit error rate set as Sync Threshold, set to [Off] when not
processing the pattern synchronization.
Bit error rate for executing pattern synchronization processing
Auto SYNC Threshold sets the bit error rate for starting or stopping
pattern synchronization processing.
The bit error rate for starting pattern synchronization processing (sync
processing start level) must be set to a larger value than the bit error rate
for stopping pattern sync processing (sync processing stop level). This
offers a method for starting/stopping pattern sync processing using
hysterics.
The following figure shows the sync processing start and stop levels when
1E–2 are selected at Sync Threshold.
Bit error rate
10
-2
10
-3
Sync Loss
Indicator: Gray
Sync Loss Indicator: Red
Sync Processing Start Level
Sync Processing Stop Level
Figure 6.3-7 Bit Error Rate at Pattern Sync Processing Start/Stop Level
When selecting [INT], the bit error rates vary depending on the Test
Pattern types, pattern length and Sync control settings.