Keysight M8000 Series of BER Test Solutions User Guide 275
Setting up Generator 5
• Deskew - This feature is used to match or adjust the timing delay
between the Data Out channels. It is a delay offset that is intended to
deskew the output in respect to other outputs. This value is an offset to
the data delay as well as jitter delay.
Line Coding
You can define the line coding for a Data Out port of the M8045A, M8195A
and M8196A modules through the Parameters window.
To set the line coding:
1Go to the Menu Bar > Generator and then select Data Out.
2 Select Line Coding functional block from the Parameters pane.
3 Select the line coding. The Data Out 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, 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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