216 Keysight M8000 Series of BER Test Solutions User Guide
4 User Interface - M8020A Display Views
The PAM4 line coding provides the symbol mapping options as shown in
the following figure:
• Uncoded - In this mapping, the bit sequence 00 maps to symbol 0,
01 maps to symbol 1, 10 maps to symbol 2 and 11 maps to symbol 3.
• Gray Coded - In this mapping, the bit sequence 00 maps to symbol 0,
00 maps to symbol 0, 01 maps to symbol 1, 11 maps to symbol 2 and
10 maps to symbol 3.
• Custom - In this mapping the consecutive data bits are mapped to
symbols. The mapping is defined as a comma separated list of bit
sequences (e.g. 00, 01, 11, 10). The position within this list
corresponds to the symbol level. First value is for Symbol 0 an the last
value is for Symbol 3.
• Symbol Level - It controls the PAM4 level mappings. It can be used to
adjust the actual output level that is being generated by a data output
for a specific PAM4 symbol. The levels of PAM4 symbol 0 and 3 cannot
be adjusted and are always kept at the value of 0% and 100% of the
actual output voltage swing.
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