Sync Loss Seconds
The sync loss seconds in this example may have been caused by high bursts of
errors or momentary clock loss. The clock signal from a clock recovery module may
have momentarily ceased. To confirm periods of momentary clock loss, check the
measurement log file.
In this example, the analyzer was in auto sync mode. If the analyzer was in manual
sync mode, the results would not have been measured and displayed in the same
way.
When the clock signal resumed, the received and ED reference patterns could only
be aligned if the synchronization functions were activated. In manual sync mode,
this would not have happened because synchronization functions are only
activated manually.
In manual sync mode, sync loss and high BER would have been measured from
the start of the momentary clock loss to the end of the accumulation period.
Data in this measurement log file confirms that there were periods of momentary
clock loss.
Solving Problems
9
Agilent J-BERT N4903B High-Performance Serial BERT
475
Possible Cause
Additional Information
Example Log of Sync and Clock Loss
Summary of Contents for J-BERT N4903B
Page 1: ...S Agilent J BERT N4903B High Performance Serial BERT User Guide s Agilent Technologies ...
Page 10: ...10 Agilent J BERT N4903B High Performance Serial BERT ...
Page 36: ...1 Planning the Test 36 Agilent J BERT N4903B High Performance Serial BERT ...
Page 60: ...2 Setting up External Instrument s 60 Agilent J BERT N4903B High Performance Serial BERT ...
Page 120: ...3 Setting up Patterns 120 Agilent J BERT N4903B High Performance Serial BERT ...
Page 360: ...6 Advanced Analysis 360 Agilent J BERT N4903B High Performance Serial BERT ...
Page 468: ...8 Jitter Tolerance Tests 468 Agilent J BERT N4903B High Performance Serial BERT ...
Page 524: ...9 Solving Problems 524 Agilent J BERT N4903B High Performance Serial BERT ...
Page 566: ...10 Customizing the Instrument 566 Agilent J BERT N4903B High Performance Serial BERT ...