Technical data

Working with 8B/10B Symbols
Working with 8B/10B Symbols – Concepts
The Serial BERT provides the enhanced capability to perform a receiver (RX) jitter
tolerance test where it analyses 10 bits symbols as coded data to measure Symbols
Error Ratio (SER), Frame Error Ratio (FER), Filler Symbol Ratio (FSR), Illegal Symbol
Ratio (ISR), Disparity Error Ratio (DER) along with the calculated BER (cBER).
You need to set the error ratio mode from the J-BERT's error detector (ED) window.
See the User Guide for the complete description on how to set up the error ratio.
Working with 8B/10B Symbols – Procedures
The following code indicates how you could set up and evaluate the 8B/10B symbol
comparison results using SCPI.
How to Set 8B/10B Symbol Comparison Mode
The following command sets the 8B/10B Symbol Comparison mode:
SENSe[1]:ERMode:MODe SER
How to Set Filler Symbols
Filler Primitives are inserted or deleted by the DUT to compensate for clock
differences between the transmitter and receiver . These are not compared and
therefore cannot be counted as errors. Filler Primitives contain filler symbols. A
maximum of 4 alternative filler primitives can be used. Each filler primitive can
consist of upto 4 filler symbols. Filler symbols are separated by a comma (,).
Example: For SAS we have 4 filler primitives each consisting of 4 filler symbols.
K28.5,D10.2,D10.2,D27.3
K28.5,D7.0,D7.0,D7.0
K28.5,D1.3,D1.3,D1.3
K28.5,D27.3,D27.3,D27.3
The following command sets the filler symbols for the error detector's Data In port.
SENS1:SFE:FSYM "K28.1,K28.1"
3 Recommended Programming Techniques
70 Agilent J-BERT N4903B High-Performance Serial BERT