354 Keysight M8000 Series of BER Test Solutions User Guide
6 Setting up Analyzer
Line Coding
You can define the line coding for a Data In port of the M8046A module
through the Parameters window.
To set the line coding:
1Go to the Menu Bar > Generator and then select Data In.
2 Select Line Coding functional block from the Parameters pane.
3 Select the line coding. The Data In port supports NRZ and PAM4 line
coding which defines how consecutive data bits are mapped to
symbols.
The PAM4 line coding provides the following symbol mapping options:
• 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.
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