Getting Started
10
Serial BERT 12.5 Gb/s User Guide
1.1.3 PRBS generator
• Selectable PRBS patterns:
o Lengths: 2
7
-1, 2
10
-1, 2
15
-1, 2
23
-1, 2
31
-1
o Mark densities: 1/2, 1/4, 1/8
• Adjustable PRBS amplitude:
o Voltage: 0.3 - 1.8 V pp per output
o Step size: 10 mV
1.1.4 Error detector
• Automatic sampling point adjustment
• Elapsed time BER measurements
• Manual threshold adjustment)
1.1.5 Operating modes
• Disabled ('safe mode': no output)
• Enabled (PRBS output enabled)
• Thru (no detector; inputs connected to Data Thru connectors on back
panel)
1.1.6 Display
• LED indicators
• Multifunction alphanumeric display
1.1.7 Data entry / interface
• Push-button control (local)
• Remote GPIB (IEEE 488.2-1992)
• Compatible with N4980A multi-instrument BERT software user interface
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