Technical data

When the de-emphasis signal converter is connected, or when the PCI
Express specification 3.0 is used, the current preset is also shown.
The “Preset...” button allows to select a preset from a list. The
selected preset is applied to the de-emphasis parameters on the right
side of the main window, and to the encoded preset hin in the
“Loopback Pattern” box. When the de-emphasis levels on the right
side of the main window are changed, the corresponding is shown.
Link Training Pattern
The link training sequence is supposed to train your device into
loopback. By default, it is generated automatically. However, you
have the option to parametrize the sequence to adjust it to your
device's needs.
When you click on “Edit Training Parameters…” (Figure 7), you can
adjust the number of packets transmitted for every stage of the link
training (Figure 8).
The “Initial delay” is a sequence of zeros transmitted before link
training. By default, you'll have to start the link training by exiting
this block via the “Manual Trigger” button (main window). However,
you can specify a time span instead.
The “Add EIEOS” check-box allows to insert some EIEOS (Exit From
Electrical Idle Ordered Sets) before loopback starts. This is not
required by the CTS, but might me helpful for some DUTs. Every 32
nd
TS1 ordered set will be replaced by an EIEOS. This number is fixed
in order to match the J-BERT pattern granularity.
15 N5990A-301 Getting Started Guide
Figure 7: Link Training Pattern Settings