EXFO FTB-8500 Series for FTB-500 - Manual (Page 240)

Stream Generation Tabs
226 FTB-8500 Series and FTB-8120NGE/8130NGE
Payload
Payload
Note: For FTB-8510B and FTB-8510G, not available with BERT test. For
FTB-8120NGE/FTB-8130NGE and FTB-8525/FTB-8535, only available with
Frame Analyzer test. Not available when the Stream Tag (Frame Analyzer)
check box is selected; in this case a PRBS is used as the payload..
Press TEST, Stream Gen, and Payload.
Stream No.
For Frame Analyzer test, select the stream number from the list. Only
stream number 1 is available for RFC 2544 and BERT tests.
Pattern

Pattern: Allows the selection of the test pattern that will be repeated
inside the entire data payload. Choices are 00 to FF. The default setting
is CC.

Binary: The pattern will automatically be converted in binary or in
hexadecimal when enabling/disabling Binary.