Technical data

When the “Poll Sequence State” option in the “Options” menu is
enabled, the current state of the sequencer is shown.
When the sequence contains a loop with a manual break condition,
that loop can be ended with the “Manual Trigger” button.
BERT Control
Figure 15 Shows the BERT control. Here you can control the
sequencer, the pattern generator and the analyzer.
The “Insert Bit Error” causes the J-BERT to insert a single bit error
into the data stream. This can be useful to verify that the DUT is in
loopback; when the DUT is not in loopback, inserting bit errors do
not affect the bit error and BER counters.
You can use the "Auto Align" button to force the analyzer to auto-
align to the incoming data. This is usually necessary after the pattern
generator was restarted, e.g. when a new pattern was downloaded.
Power Switching
If a power switch system is connected, the group-box “Power Switch”
will be visible in the main window (see Figure 16; only visible when
Power Switch is connected). Here you can turn the power off and on.
This can be used to power-cycle the DUT.
21 N5990A-301 Getting Started Guide
Figure 15: BERT control
Figure 14: Sequencer Control
Figure 16: Power Switch