Agilent Technologies J-BERT N4903B, User Manual, Page: 95 / 572

Range of Hardware-Generated PRBS Patterns
The following table lists the hardware-generated 2^n -1 PRBS pattern lengths that
correspond to different n values. This is before the pattern is finally inverted.
Table 12
n Sequence Length Longest Run of 1's Longest Run of 0's
7 127 7 6
10 1,023 10 9
11 2,047 11 10
15 32,767 15 14
23 8,388,607 23 22
31 2,147,483,647 31 30
Decimation of PRBS Patterns
A special property of 2^n -1 PRBS patterns is that they can be demultiplexed into
the same patterns at slower speeds with different phases. This is also true for
multiplexing. The demux or mux must have n ports.
Hardware-Generated PRBS - Procedures
The recommended way to load the data patterns to the pattern generator and error
detector is to use the
Pattern Select Form
dialog box.
See “Loading Patterns to the Pattern Generator and Error Detector” on page 73 for
details.
Hardware-Generated PRBS - Reference
Use the
Pattern Select
dialog box to select the pattern(s) you want to write to the
pattern generator and the error detector. See “Select Pattern Dialog Box” on page
89 for details.
Setting up Patterns
3
Agilent J-BERT N4903B High-Performance Serial BERT 95
PRBS Lengths