•
For a regenerator test, set up the bit rate according to the device
specification.
T I P
If your device converts the input pattern, the error detector needs a different pattern
than the pattern generator. See
“Loading Patterns to the Pattern Generator and
for details.
User Patterns
User Patterns - Concepts
User patterns are user-editable patterns that are written to the Serial
BERT's memory for pattern generation (see
Generate Patterns?” on page 23
for details). User patterns can contain
up to 32Mbit of any arbitrary data pattern. They may be generated by
the Serial BERT software or defined in a pattern file and loaded into
the memory. The Serial BERT reads the memory bit by bit, and generates
the output accordingly.
The following topics explain how the Serial BERT works with user
patterns, and also explain how user patterns are generated.
N O T E
The way software-generated patterns (distorted PRBS, PRBN) are output is
identical to that of user patterns: The patterns are written to the memory, and the
output is generated from there. Some of the information in these topics covers how
the patterns are actually generated, and thus also applies to software-generated
patterns.
When to Test with User Patterns
Creating or editing patterns is necessary for quality testing because
different patterns present different data loads to the device. This can
cause variations in the bit error ratio. With user patterns, you can define
exactly the pattern used in the test.
Setting up Patterns
2
Agilent J-BERT N4903 High-Performance Serial BERT
27
Summary of Contents for J-BERT N4903
Page 1: ...S Agilent J BERT N4903 High Performance Serial BERT User Guide s Agilent Technologies...
Page 68: ...2 Setting up Patterns 68 Agilent J BERT N4903 High Performance Serial BERT...
Page 158: ...4 Setting up the Error Detector 158 Agilent J BERT N4903 High Performance Serial BERT...
Page 314: ...6 Evaluating Results 314 Agilent J BERT N4903 High Performance Serial BERT...
Page 374: ...7 Jitter Tolerance Tests 374 Agilent J BERT N4903 High Performance Serial BERT...
Page 394: ...8 Solving Problems 394 Agilent J BERT N4903 High Performance Serial BERT...
Page 434: ...Index 434 Agilent J BERT N4903 High Performance Serial BERT...
