EXFO FTB-8500 Series for FTB-500 - Manual (Page 202)

Traffic Analyzer Tabs
188 FTB-8500 Series and FTB-8120NGE/8130NGE
Capture

Capture button: Allows to start/stop the data capture. The test must be
running (refer to Global Test Status and Controls on page 42) in order
to start capturing and recording data into the buffer. The Capture
button is not available when the trigger on field match is selected while
its trigger parameters are not valid.
No data will be recorded in the buffer if no frame matches the filter and
the trigger criteria during the data capture.
The data capture stops automatically once the buffer is full. The
maximum buffer capacity is 65 KBytes for FTB-8510B and 256 MBytes
for FTB-8510G, FTB-8525, FTB-8535, FTB-8120NGE, and FTB-8130NGE.
When the capture stops or is manually stopped, the following message
is displayed: Capture completed. Press Export to save captured
data (the test must be stopped). To avoid losing the captured data,
the data must be exported and saved into a file before restarting the
test or creating a new test.

Export button: Allows to export the data capture into a .pcap file
format and to view the file using Wireshark. Refer to Data Capture
Export on page 509 for more information.