Keysight M8000 Series of BER Test Solutions User Guide 291
Setting up Generator 5
1 On the Clock Generator functional block, set the symbol rate between
16.208 GBd to 26.563 GBd. Please note that the FEC engine only
supports 26.5625 GBd PAM4 signals.
2 On the Data Out functional block, set output levels. Make sure to turn
ON the output levels.
3 On the Line Coding functional block select PAM4. Enable the PAM4
Pre-Coder. Enabling the pre-coder is optional and is only required if
the DUT also have the pre-coder enabled.
4 Next step involves selecting the FEC pattern. To do this, click Select
Pattern dialog. For more information on this dialog, refer to Select
Pattern Dialog on page 390. Use this dialog to download FEC pattern
on the Data Out locations as shown in the following figure:
Both channels of the M8045A generate the FEC encoded signal
independently. When setting up the same sequence for both channels,
both channels will generate the exactly same bit sequence.
5 The FEC pattern will be now available in the Sequence Editor. Infinitely
loop the PRBS, FEC encoded scrambled idle and FEC remote fault
patterns. Press the Break button to move the sequence to the next
block. Refer to Sequence Editor on page 359 for details on how to
create, loop and break sequences.
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