Viavi Xgig, User Manual

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Chapter 4, Xgig TraceControl Capture Configuration Capture and Trigger Setup
122 Xgig Analyzer User’s Guide
Stop When Buffer is Full (Preset Trigger Condition)
The Stop When Buffer is Full option tells the analyzer to stop capturing when the buffer is full.
The flowchart in the overview pane shows one state and a decision box asking whether the buffer
is full. If the answer is no, it continues capturing. If the answer is yes, the process stops. There is
no trigger.
Stop When Stop Button is Clicked (No Trigger)
The
Stop When Stop Button is Clicked
option tells the analyzer to stop capturing when the
Stop
button is pressed. If the stop button is not clicked before memory is full, the analyzer buffer will
wrap around. The flowchart in the overview pane shows one state and a decision box asking
whether the stop button has been clicked. If the answer is no, it continues capturing. If the answer
is yes, the process stops. There is no trigger.
Stop When Stop Button is Clicked
is the default
trigger mode.
Trigger (Two-State Triggering)
The Trigger option has two states, Pre-Triggered and Triggered. The user can enter one transition
for the trigger. Once the trigger condition is met, the capture stops unless the post fill option is set.
Two-state triggers allow you to stop capture based on an event that occurs in the data stream.
You can select and define the trigger condition in the Transition Editor on the
Capture and
Trigger Setup tab. You may use any or all of the Bit Errors as triggers. You can trigger on an
ordered set, primitive, or a frame by highlighting the Pre-Triggered state’s transition bubble and
dragging a template from the
Available Templates Browser tree into the Wait For Any Of
These/ And NOT These
panes of the Transition Editor. To define a specific frame or frame type
that you want to trigger on, you may drag Any Frame from the Viavi Library folder to the User
Library
folder and double-click it to change its content using the
Template Editor
. Finally, you
can rename the template by right-clicking it and selecting Rename .
Two-State Trigger Example
In this example, when the trigger condition of Any Link Error is encountered in the data stream,
the analyzer continues capture until the buffer is full.
The percentage of the buffer containing data immediately after the trigger event is controlled by
the Post Trigger Fill setting. If the Post Trigger Fill position is set to 50%, then 50% of the buffer
will contain data seen after the trigger event.
Press the
Apply
button in the TraceControl Status window to load the configuration to the
selected analyzer port(s).