User guide

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Illegal Symbol Count (Illegal symbol counter)
The total number of illegal symbol count received in a time interval is displayed
here.
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Disparity Error Ratio (DER)
The ratio of the number of illegal disparity change count to the number of
symbols received in the current (or last completed) accumulation period,
specified by the gate period is displayed here.
The following is the expression used to calculate the Disparity Error Ratio:
•
Filler Symbol Ratio (FSR)
The ratio of the number of filler symbol count to the number of symbols received
in the current (or last completed) accumulation period, specified by the gate
period is displayed here.
The following is the expression used to calculate the Filler Symbol Ratio:
•
Illegal Symbol Ratio (ISR)
The ratio of the number of Illegal Symbol count to the number of symbols
received in the current (or last completed) accumulation period, specified by
the gate period is displayed here. Illegal Symbol are invalid K and D symbols
i.e. 0000000000 it does not belong to any valid K or D symbols.
The following is the expression used to calculate the Illegal Symbol Ratio:
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Expected Filler Symbol Count
The total number of Expected Filler Symbol Count received in a time interval is
displayed here.
The following is the expression used to calculate the Expected Filler Symbol
Count:
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Data Rate Ratio
The ratio of the number of filler symbol count to the expected filler symbol count
received in the current (or last completed) accumulation period, specified by
the gate period is displayed here.
Evaluating Results 7
Agilent J-BERT N4903B High-Performance Serial BERT 387