User guide

Operation
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Serial BERT 12.5 Gb/s User Guide
4.5.2 Error Free Test
When the error detector clock phase is correctly adjusted, the default settings
will result in error-free operation. The Error ε light will be off, and the measured
BER will be zero. Check the error-free operation as follows:
• Put the system in self test mode, described in Section 4.5.1.
• Press the Receiver > On button and ensure the light is on
• Press the Display > Scroll ↓ button and select Err (should show zero
errors)
• Press the Display > Scroll ↓ button and select BER (should show zero)
• Press the Display > Scroll ↓ button and select ε time (sec) (should be
increasing)
4.5.3 High BER Test
To verify that the error detector can correctly count a large number of errors,
first allow the detector to synchronize with a clear input signal by adjusting the
detector clock phase to an error-free operating point. Once the detector has
been trained, turn the detector on and invert the PRBS signal to generate 100%
errors, as follows:
• Put the system in self test mode, described in Section 4.5.1.
• Press the Receiver > On button and ensure the light is on
• Press the Data Path > PRBS¯¯¯¯ button and ensure the light is on
• Press the Display > Scroll ↓ button and select Err (should show many
errors)
• Press the Display > Scroll ↓ button and select BER (should show high
BER)
• Press the Display > Scroll ↓ button and select ε time (sec) (should be
increasing)